1
DRAFT OF JANUARY 20, 1998


                        [Form of Underwriting Agreement]

                         MERCURY COMPUTER SYSTEMS, INC.
                               3,500,000 Shares(1)
                                  Common Stock
                             UNDERWRITING AGREEMENT

                                                              January __, 1998

PRUDENTIAL SECURITIES INCORPORATED
COWEN & COMPANY
___ As Representatives of the several Underwriters
c/o Prudential Securities Incorporated
One New York Plaza
New York, New York 10292

Dear Sirs:

     Mercury Computer Systems, Inc., a Massachusetts corporation (the
"Company"), each of the selling stockholders of the Company named in SCHEDULE I
hereto (the "Principal Selling Stockholders") and each of the selling
stockholders of the Company named in SCHEDULE II hereto (the "Additional Selling
Stockholders") (the Principal Selling Stockholders and the Additional Selling
Stockholders being referred to herein collectively as the "Selling
Stockholders") severally confirm their respective agreements with the several
underwriters named in SCHEDULE III hereto (the "Underwriters"), for whom you
have been duly authorized to act as representatives (in such capacities, the
"Representatives"), as set forth below. If you are the only Underwriters, all
references herein to the Representatives shall be deemed to be to the
Underwriters.

         1. SECURITIES. Subject to the terms and conditions herein contained,
the Company proposes to issue and sell, and the Selling Stockholders propose to
sell, severally, to the several

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(1)  Plus options to purchase (i) from the Selling Stockholders up to 295,350
     additional shares to cover over-allotments and (ii) from the Company up to
     229,650 additional shares to cover over-allotments. The options shall be
     exercised FIRST with respect to the shares subject to such options offered
     by the Selling Stockholders ON A PRO RATA basis until all of the 295,350
     shares have been exercised and SECOND with respect to the shares subject to
     such options offered by the Company.


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Underwriters an aggregate of 2,000,000 shares and 1,500,000 shares, respectively
(the "Firm Securities") of the Company's Common Stock, par value $.01 per share
("Common Stock"). The Selling Stockholders propose to sell, severally, to the
several Underwriters not more than 295,350 additional shares of Common Stock, in
the aggregate, if requested by the Representatives as provided in Section 3 of
this Agreement, in the respective amounts set forth opposite the names of the
Selling Stockholders in Column (b) of SCHEDULE I and SCHEDULE II hereto, as the
case may be. The Company proposes to sell to the several Underwriters not more
than 229,650 additional shares of Common Stock if requested by the
Representatives and if the Representatives have already exercised in full their
options with respect to the shares identified in the previous sentence, all as
provided in Section 3 of this Agreement. Any and all shares of Common Stock to
be purchased by the Underwriters pursuant to such options are referred to herein
as the "Option Securities", and the Firm Securities and any Option Securities
are collectively referred to herein as the "Securities".

     2(A). REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company represents
and warrants to, and agrees with, each of the several Underwriters that:

     (a) A registration statement on Form S-1 (File No. 333-41139) with respect
to the Securities, including a prospectus subject to completion, has been filed
by the Company with the Securities and Exchange Commission (the "Commission")
under the Securities Act of 1933, as amended (the "Act"), and one or more
amendments to such registration statement may have been so filed. After the
execution of this Agreement, the Company will file with the Commission either
(i) if such registration statement, as it may have been amended, has been
declared by the Commission to be effective under the Act, either (A) if the
Company relies on Rule 434 under the Act, a Term Sheet (as hereinafter defined)
relating to the Securities, that shall identify the Preliminary Prospectus (as
hereinafter defined) that it supplements containing such information as is
required or permitted by Rules 434, 430A and 424(b) under the Act or (B) if the
Company does not rely on Rule 434 under the Act, a prospectus in the form most
recently included in an amendment to such registration statement (or, if no such
amendment shall have been filed, in such registration statement), with such
changes or insertions as are required by Rule 430A under the Act or permitted by
Rule 424(b) under the Act, and in the case of either clause (i)(A) or (i)(B) of
this sentence as have been provided to and approved by the Representatives prior
to the execution of this Agreement, or (ii) if such registration statement, as
it may have been amended, has not been declared by the Commission to be
effective under the Act, an amendment to such registration statement, including
a form of prospectus, a copy of which amendment has been furnished to and
approved by the Representatives prior to the execution of this Agreement. The
Company may also file a related registration statement with the Commission
pursuant to Rule 462(b) under the Act for the purpose of registering certain
additional Securities, which registration shall be effective upon filing with
the Commission. As used in this Agreement, the term "Original Registration
Statement" means the registration statement initially filed relating to the
Securities, as amended at the time when it was or is declared effective,
including all financial schedules and exhibits thereto and including any
information omitted therefrom pursuant to Rule 430A under the Act and included
in the Prospectus (as hereinafter defined); the term "Rule 462(b) Registration
Statement" means any registration statement filed with the Commission pursuant
to Rule 462(b) under the Act (including the Registration Statement and any
Preliminary Prospectus


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or Prospectus incorporated therein at the time such Registration Statement
becomes effective); the term "Registration Statement" includes both the Original
Registration Statement and any Rule 462(b) Registration Statement; the term
"Preliminary Prospectus" means each prospectus subject to completion filed with
such registration statement or any amendment thereto (including the prospectus
subject to completion, if any, included in the Registration Statement or any
amendment thereto at the time it was or is declared effective); the term
"Prospectus" means:

     (A) if the Company relies on Rule 434 under the Act, the Term Sheet
     relating to the Securities that is first filed pursuant to Rule 424(b)(7)
     under the Act, together with the Preliminary Prospectus identified therein
     that such Term Sheet supplements;

     (B) if the Company does not rely on Rule 434 under the Act, the prospectus
     first filed with the Commission pursuant to Rule 424(b) under the Act; or

     (C) if the Company does not rely on Rule 434 under the Act and if no
     prospectus is required to be filed pursuant to Rule 424(b) under the Act,
     the prospectus included in the Registration Statement;

and the term "Term Sheet" means any term sheet that satisfies the requirements
of Rule 434 under the Act. Any reference herein to the "date" of a Prospectus
that includes a Term Sheet shall mean the date of such Term Sheet.

     (b) The Commission has not issued any order preventing or suspending use of
any Preliminary Prospectus. When any Preliminary Prospectus was filed with the
Commission it (i) contained all statements required to be stated therein in
accordance with, and complied in all material respects with the requirements of,
the Act and the rules and regulations of the Commission thereunder and (ii) did
not include any untrue statement of a material fact or omit to state any
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading. When the
Registration Statement or any amendment thereto was or is declared effective, it
(i) contained or will contain all statements required to be stated therein in
accordance with, and complied or will comply in all material respects with the
requirements of, the Act and the rules and regulations of the Commission
thereunder and (ii) did not or will not include any untrue statement of a
material fact or omit to state any material fact necessary to make the
statements therein not misleading. When the Prospectus or any Term Sheet that is
a part thereof or any amendment or supplement to the Prospectus is filed with
the Commission pursuant to Rule 424(b) (or, if the Prospectus or part thereof or
such amendment or supplement is not required to be so filed, when the
Registration Statement or the amendment thereto containing such amendment or
supplement to the Prospectus was or is declared effective) and on the Firm
Closing Date and any Option Closing Date (both as hereinafter defined), the
Prospectus, as amended or supplemented at any such time, (i) contained or will
contain all statements required to be stated therein in accordance with, and
complied or will comply in all material respects with the requirements of, the
Act and the rules and regulations of the Commission thereunder and (ii) did not
or will not include any untrue statement of a material fact or omit to state any
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading. The foregoing


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provisions of this paragraph (b) do not apply to statements or omissions made in
any Preliminary Prospectus, the Registration Statement or any amendment thereto
or the Prospectus or any amendment or supplement thereto in reliance upon and in
conformity with written information furnished to the Company by any Underwriter
through the Representatives specifically for use therein.

     (c) If the Company has elected to rely on Rule 462(b) and the Rule 462(b)
Registration Statement has not been declared effective (i) the Company has filed
a Rule 462(b) Registration Statement in compliance with, and that is effective
upon filing pursuant to, Rule 462(b) and has received confirmation of its
receipt and (ii) the Company has given irrevocable instructions for transmission
of the applicable filing fee in connection with the filing of the Rule 462(b)
Registration Statement, in compliance with Rule 111 promulgated under the Act or
the Commission has received payment of such filing fee.

     (d) The Company has no subsidiaries other than those listed in SCHEDULE IV
hereto. The Company and each of its subsidiaries have been duly organized and
are validly existing as corporations in good standing under the laws of their
respective jurisdictions of incorporation and are duly qualified to transact
business as foreign corporations and are in good standing under the laws of all
other jurisdictions where the ownership or leasing of their respective
properties or the conduct of their respective businesses requires such
qualification, except where the failure to be so qualified would not have a
material adverse effect on the Company and its subsidiaries, taken as a whole.

     (e) The Company and each of its subsidiaries have full power (corporate or
limited liability company) to own or lease their respective properties and
conduct their respective businesses as described in the Registration Statement
and the Prospectus or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus; and the Company has full corporate or limited liability
company power to enter into this Agreement and to carry out all the terms and
provisions hereof to be carried out by it.

     (f) The issued shares of capital stock of each of the Company's
subsidiaries have been duly authorized and validly issued, are fully paid and
nonassessable and, except as otherwise set forth in the Prospectus or, if the
Prospectus is not in existence, the most recent Preliminary Prospectus, are
owned beneficially by the Company free and clear of any security interests,
liens, encumbrances, equities or claims.

     (g) The Company's authorized, issued and outstanding capitalization is set
forth in the Prospectus or, if the Prospectus is not in existence, the most
recent Preliminary Prospectus. All of the issued and outstanding shares of
capital stock of the Company have been duly authorized and validly issued and
are fully paid and nonassessable. The Firm Securities and the Option Securities
have been duly authorized and at the Firm Closing Date or the related Option
Closing Date (as the case may be), after payment therefor in accordance
herewith, will be validly issued, fully paid and nonassessable. No holders of
outstanding shares of capital stock of the Company are entitled as such to any
preemptive or other rights to subscribe for any of the Securities, and no holder
of securities of the Company has any right which has not been fully exercised or
waived to require 


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the Company to register the offer or sale of any securities owned by such holder
under the Act in the public offering contemplated by this Agreement.

     (h) After giving effect to the amendment to the Company's Articles of
Organization described in the Prospectus, the capital stock of the Company
conforms to the description thereof contained in the Prospectus or, if the
Prospectus is not in existence, the most recent Preliminary Prospectus.

     (i) Except as disclosed in the Prospectus (or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus), there are no outstanding (A)
securities or obligations of the Company or any of its subsidiaries convertible
into or exchangeable for any capital stock of the Company or any such
subsidiary, (B) warrants, rights or options to subscribe for or purchase from
the Company or any such subsidiary any such capital stock or any such
convertible or exchangeable securities or obligations, or (C) obligations of the
Company or any such subsidiary to issue any shares of capital stock, any such
convertible or exchangeable securities or obligations, or any such warrants,
rights or options.

     (j) The consolidated financial statements and schedules of the Company and
its consolidated subsidiaries included in the Registration Statement and the
Prospectus (or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus) fairly present the financial position of the Company and
its consolidated subsidiaries and the results of operations and changes in
financial condition as of the dates and periods therein specified. Such
financial statements and schedules have been prepared in accordance with
generally accepted accounting principles consistently applied throughout the
periods involved (except as otherwise noted therein). The selected financial
data set forth under the caption "Selected Consolidated Financial Data" in the
Prospectus (or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus) fairly present, on the basis stated in the Prospectus
(or such Preliminary Prospectus), the information included therein.

     (k) Coopers & Lybrand L.L.P., who have certified certain financial
statements of the Company and its consolidated subsidiaries and delivered their
report with respect to the audited consolidated financial statements and
schedules included in the Registration Statement and the Prospectus (or, if the
Prospectus is not in existence, the most recent Preliminary Prospectus), are
independent public accountants as required by the Act and the applicable rules
and regulations thereunder.

     (l) The execution and delivery of this Agreement have been duly authorized
by the Company, and this Agreement has been duly executed and delivered by the
Company, and is the valid and binding agreement of the Company, enforceable
against the Company in accordance with its terms.

     (m) No legal or governmental proceedings are pending to which the Company
or any of its subsidiaries is a party or to which the property of the Company or
any of its subsidiaries is subject that are required to be described in the
Registration Statement or the Prospectus and are not described therein (or, if
the Prospectus is not in existence, the most recent Preliminary


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Prospectus), and no such proceedings have been threatened against the Company or
any of its subsidiaries or with respect to any of their respective properties;
and no contract or other document is required to be described in the
Registration Statement or the Prospectus or to be filed as an exhibit to the
Registration Statement that is not described therein (or, if the Prospectus is
not in existence, the most recent Preliminary Prospectus) or filed as required.

     (n) The issuance, offering and sale of the Securities to the Underwriters
by the Company pursuant to this Agreement, the compliance by the Company with
the other provisions of this Agreement and the consummation of the other
transactions herein contemplated do not (i) require the consent, approval,
authorization, registration or qualification of or with any governmental
authority, except such as have been obtained, such as may be required under
state securities or blue sky laws and, if the registration statement filed with
respect to the Securities (as amended) is not effective under the Act as of the
time of execution hereof, such as may be required (and shall be obtained as
provided in this Agreement) under the Act, or (ii) conflict with or result in a
breach or violation of any of the terms and provisions of, or constitute a
default under, any indenture, mortgage, deed of trust, lease or other agreement
or instrument to which the Company or any of its subsidiaries is a party or by
which the Company or any of its subsidiaries or any of their respective
properties are bound, or the charter documents or by-laws of the Company or any
of its subsidiaries, or any statute or any judgment, decree, order, rule or
regulation of any court or other governmental authority or any arbitrator
applicable to the Company or any of its subsidiaries.

     (o) Subsequent to the respective dates as of which information is given in
the Registration Statement and the Prospectus or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus, neither the Company nor any
of its subsidiaries has sustained any material loss or interference with their
respective businesses or properties from fire, flood, hurricane, accident or
other calamity, whether or not covered by insurance, or from any labor dispute
or any legal or governmental proceeding and there has not been any material
adverse change, or any development involving a prospective material adverse
change, in the condition (financial or otherwise), management, business
prospects, net worth, or results of the operations of the Company or any of its
subsidiaries, except in each case as described in or contemplated by the
Prospectus or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus.

     (p) The Company has not, directly or indirectly, (i) taken any action
designed to cause or to result in, or that has constituted or which might
reasonably be expected to constitute, the stabilization or manipulation of the
price of any security of the Company to facilitate the sale or resale of the
Securities or (ii) since the filing of the Registration Statement (A) sold, bid
for, purchased, or paid anyone any compensation for soliciting purchases of, the
Securities or (B) paid or agreed to pay to any person any compensation for
soliciting another to purchase any other securities of the Company (except for
the sale of Securities by the Selling Stockholders under this Agreement).

     (q) The Company has not distributed and, prior to the later of (i) the
Closing Date and (ii) the completion of the distribution of the Securities, will
not distribute any offering material in connection with the offering and sale of
the Securities other than the Registration Statement or 


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any amendment thereto, any Preliminary Prospectus or the Prospectus or any
amendment or supplement thereto, or other materials, if any permitted by the
Act.

     (r) Subsequent to the respective dates as of which information is given in
the Registration Statement and the Prospectus (or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus), (1) the Company and its
subsidiaries have not incurred any material liability or obligation, direct or
contingent, nor entered into any material transaction not in the ordinary course
of business; (2) the Company has not purchased any of its outstanding capital
stock, nor declared, paid or otherwise made any dividend or distribution of any
kind on its capital stock; and (3) there has not been any material change in the
capital stock, short-term debt or long-term debt of the Company and its
consolidated subsidiaries, except in each case as described in or contemplated
by the Prospectus (or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus).

     (s) The Company and each of its subsidiaries have good and marketable title
in fee simple to all items of real property and marketable title to all personal
property owned by each of them, in each case free and clear of any security
interests, liens, encumbrances, equities, claims and other defects, except such
as do not materially and adversely affect the value of such property and do not
interfere with the use made of such property by the Company or such subsidiary,
and any real property and buildings held under lease by the Company or any such
subsidiary are held under valid, subsisting and enforceable leases, with such
exceptions as are not material and do not interfere with the use made of such
property and buildings by the Company or such subsidiary, in each case except as
described in or contemplated by the Prospectus (or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus).

     (t) No labor dispute with the employees of the Company or any of its
subsidiaries exists or is threatened that could result in a material adverse
change in the condition (financial or otherwise), business prospects, net worth
or results of operations of the Company and its subsidiaries, except as
described in or contemplated by the Prospectus (or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus).

     (u) The Company and its subsidiaries own or possess, or can acquire on
reasonable terms, all material patents, patent applications, trademarks, service
marks, trade names, licenses, copyrights and proprietary or other confidential
information currently employed by them in connection with their respective
businesses, and neither the Company nor any such subsidiary has received any
notice of infringement of or conflict with asserted rights of any third party
with respect to any of the foregoing which, singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, would result in a
material adverse change in the condition (financial or otherwise), business
prospects, net worth or results of operations of the Company and its
subsidiaries, except as described in or contemplated by the Prospectus (or, if
the Prospectus is not in existence, the most recent Preliminary Prospectus).

     (v) The Company and each of its subsidiaries are insured by insurers of
recognized financial responsibility against such losses and risks and in such
amounts as are prudent and customary in the businesses in which they are
engaged.


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     (w) No subsidiary of the Company is currently prohibited, directly or
indirectly, from paying any dividends to the Company, from making any other
distribution on such subsidiary's capital stock, from repaying to the Company
any loans or advances to such subsidiary from the Company or from transferring
any of such subsidiary's property or assets to the Company or any other
subsidiary of the Company, except as described in or contemplated by the
Prospectus (or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus).

     (x) The Company and its subsidiaries possess all certificates,
authorizations and permits issued by the appropriate federal, state or foreign
regulatory authorities necessary to conduct their respective businesses (except
those the nonpossession of which would not have a material adverse effect on the
business, operations or condition (financial or otherwise) of the Company and
its subsidiaries, taken as a whole), and neither the Company nor any such
subsidiary has received any notice of proceedings relating to the revocation or
modification of any such certificate, authorization or permit which, singly or
in the aggregate, if the subject of an unfavorable decision, ruling or finding,
would result in a material adverse change in the condition (financial or
otherwise), business prospects, net worth or results of operations of the
Company and its subsidiaries, taken as a whole, except as described in or
contemplated by the Prospectus (or, if the Prospectus is not in existence, the
most recent Preliminary Prospectus).

     (y) The Company has filed all foreign, federal, state and local tax returns
that are required to be filed or has requested extensions thereof (except in any
case in which the failure so to file would not have a material adverse effect on
the Company and its subsidiaries) and has paid all taxes required to be paid by
it and any other assessment, fine or penalty levied against it, to the extent
that any of the foregoing is due and payable, except for any such assessment,
fine or penalty that is currently being contested in good faith or as described
in or contemplated by the Prospectus (or, if the Prospectus is not in existence,
the most recent Preliminary Prospectus).

     (z) Neither the Company nor any of its subsidiaries is in violation of any
federal or state law or regulation relating to occupational safety and health or
to the storage, handling or transportation of hazardous or toxic materials and
the Company and its subsidiaries have received all permits, licenses or other
approvals required of them under applicable federal and state occupational
safety and health and environmental laws and regulations to conduct their
respective businesses, and the Company and each such subsidiary is in compliance
with all terms and conditions of any such permit, license or approval, except
any such violation of law or regulation, failure to receive required permits,
licenses or other approvals or failure to comply with the terms and conditions
of such permits, licenses or approvals which would not, singly or in the
aggregate, result in a material adverse change in the condition (financial or
otherwise), business prospects, net worth or results of operations of the
Company and its subsidiaries, taken as a whole, except as described in or
contemplated by the Prospectus (or, if the Prospectus is not in existence, the
most recent Preliminary Prospectus).

     (aa) Each certificate signed by any officer of the Company and delivered to
the Representatives or counsel for the Underwriters shall be deemed to be a
representation and warranty by the Company to each Underwriter as to the matters
covered thereby.


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     (bb) Except for the shares of capital stock of each of the subsidiaries
owned by the Company and such subsidiaries, neither the Company nor any such
subsidiary owns any shares of stock or any other equity securities of any
corporation or has any equity interest in any firm, partnership, association or
other entity, except as described in or contemplated by the Prospectus (or, if
the Prospectus is not in existence, the most recent Preliminary Prospectus).

     (cc) The Company and each of its subsidiaries maintain a system of internal
accounting controls sufficient to provide reasonable assurance that (1)
transactions are executed in accordance with management's general or specific
authorizations; (2) transactions are recorded as necessary to permit preparation
of financial statements in conformity with generally accepted accounting
principles and to maintain asset accountability; (3) access to assets is
permitted only in accordance with management's general or specific
authorization; and (4) the recorded accountability for assets is compared with
the existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

     (dd) The Company has complied with, and is and will be in compliance with,
the provisions of that certain Florida act relating to disclosure of doing
business with Cuba, codified as Section 517.075 of the Florida statutes, and the
rules and regulations thereunder or is exempt therefrom.

     (ee) The Company is not, and upon the issuance and sale of the Securities
as herein contemplated and the application of the net proceeds therefrom as
described in the Prospectus will not be, an "investment company" or an entity
"controlled" by an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended.

     (ff) No default exists, and no event has occurred which, with notice or
lapse of time or both, would constitute a default in the due performance and
observance of any term, covenant or condition of any indenture, mortgage, deed
of trust, lease or other agreement or instrument to which the Company or any of
its subsidiaries is a party or by which the Company or any of its subsidiaries
or any of their respective properties is bound or may be affected in any
material adverse respect with regard to property, business or operations of the
Company and its subsidiaries, taken as a whole.

     2(B). REPRESENTATIONS AND WARRANTIES OF THE SELLING STOCKHOLDERS. Each
Selling Stockholder represents and warrants to, and agrees with, each of the
several Underwriters, severally and not jointly, that:

     (a) Such Selling Stockholder has full power to enter into this Agreement
and to sell, assign, transfer and deliver to the Underwriters the Securities to
be sold by such Selling Stockholder hereunder in accordance with the terms of
this Agreement; and this Agreement has been duly executed and delivered by such
Selling Stockholder, and is the valid and binding agreement of such Selling
Stockholder, enforceable against each such Selling Stockholder in accordance
with its terms.


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     (b) Such Selling Stockholder has duly executed and delivered a power of
attorney and custody agreement (with respect to such Selling Stockholder, the
"Power-of-Attorney" and the "Custody Agreement", respectively), each in the form
heretofore delivered to the Representatives, appointing James R. Bertelli and R.
Schorr Berman as such Selling Stockholder's attorney-in-fact (the
"Attorney-in-Fact") with authority to execute, deliver and perform this
Agreement on behalf of such Selling Stockholder and appointing Hutchins, Wheeler
& Dittmar, A Professional Corporation, as custodian thereunder (the
"Custodian"). Certificates in negotiable form, endorsed in blank or accompanied
by blank stock powers duly executed, with signatures appropriately guaranteed,
representing the Securities to be sold by such Selling Stockholder hereunder
have been deposited with the Custodian pursuant to the Custody Agreement for the
purpose of delivery pursuant to this Agreement. Such Selling Stockholder has
full power to enter into the Custody Agreement and the Power-of-Attorney and to
perform its obligations under the Custody Agreement. If such Selling Stockholder
is a corporation, the execution and delivery of the Custody Agreement and the
Power-of-Attorney have been duly authorized by all necessary corporate action of
such Selling Stockholder; the Custody Agreement and the Power-of-Attorney have
been duly executed and delivered by such Selling Stockholder and, assuming due
authorization, execution and delivery by the Custodian, are the legal, valid,
binding and enforceable instruments of such Selling Stockholder. Such Selling
Stockholder agrees that each of the Securities represented by the certificates
on deposit with the Custodian is subject to the interests of the Underwriters
hereunder, that the arrangements made for such custody, the appointment of the
Attorney-in-Fact and the right, power and authority of the Attorney-in-Fact to
execute and deliver this Agreement, to agree on the price at which the
Securities (including such Selling Stockholder's Securities) are to be sold to
the Underwriters, and to carry out the terms of this Agreement, are to that
extent irrevocable and that the obligations of such Selling Stockholder
hereunder shall not be terminated, except as provided in this Agreement or the
Custody Agreement, by any act of such Selling Stockholder, by operation of law
or otherwise, whether in the case of any individual Selling Stockholder by the
death or incapacity of such Selling Stockholder, in the case of a trust or
estate by the death of the trustee or trustees or the executor or executors or
the termination of such trust or estate, or in the case of a corporate or
partnership Selling Stockholder by its liquidation or dissolution or by the
occurrence of any other event. If any individual Selling Stockholder, trustee or
executor should die or become incapacitated or any such trust should be
terminated, or if any corporate or partnership Selling Stockholder shall
liquidate or dissolve, or if any other event should occur, before the delivery
of such Securities hereunder, the certificates for such Securities deposited
with the Custodian shall be delivered by the Custodian in accordance with the
respective terms and conditions of this Agreement as if such death, incapacity,
termination, liquidation or dissolution or other event had not occurred,
regardless of whether or not the Custodian or the Attorney-in-Fact shall have
received notice thereof.

     (c) Such Selling Stockholder is the lawful owner of the Securities to be
sold by such Selling Stockholder hereunder and upon sale and delivery of, and
payment for, such Securities, as provided herein, such Selling Stockholder will
convey good and marketable title to such Securities, free and clear of any
security interests, liens, encumbrances, equities, claims or other defects. Such
Selling Stockholder has obtained all authorizations and approvals required by
law and under its charter or bylaws, partnership agreement, trust agreement or
other organizational 


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documents, as the case may be, to enter this Agreement, such Selling
Stockholder's Power of Attorney and Custody Agreement, to sell, transfer and
deliver all of the shares of Common Stock which may be sold by such Selling
stockholder pursuant to this Agreement; and to comply with other obligations
hereunder and thereunder.

     (d) Such Selling Stockholder has not, directly or indirectly, (i) taken any
action designed to cause or result in, or that has constituted or which might
reasonably be expected to constitute, the stabilization or manipulation of the
price of any security of the Company to facilitate the sale or resale of the
Securities or (ii) since the filing of the Registration Statement (A) sold, bid
for, purchased, or paid anyone any compensation for soliciting purchases of, the
Securities or (B) paid or agreed to pay to any person any compensation for
soliciting another to purchase any other securities of the Company (except for
the sale of Securities by the Selling Stockholders under this Agreement).

     (e) To the extent that any statements or omissions are made in the
Registration Statement, any Preliminary Prospectus, the Prospectus or any
amendment or supplement thereto in reliance upon and in conformity with written
information furnished to the Company by such Selling Stockholder specifically
for use therein, such Preliminary Prospectus did, and the Registration Statement
and the Prospectus and any amendments or supplements thereto, when they become
effective or are filed with the Commission, as the case may be, will conform in
all material respects to the requirements of the Act and the respective rules
and regulations of the Commission thereunder and will not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein, in the light of the
circumstances under which they are made, not misleading. Such Selling
Stockholder has reviewed the Prospectus (or, if the Prospectus is not in
existence, the most recent Preliminary Prospectus) and the Registration
Statement, and the information regarding such Selling Stockholder set forth
therein under the caption "Principal and Selling Stockholders" is complete and
accurate.

     (f) The sale by such Selling Stockholder of Securities pursuant hereto is
not prompted by any adverse information known to such Selling Stockholder
concerning the Company that is not set forth in the Registration Statement or
the Prospectus (or, if the Prospectus is not in existence, the most recent
Preliminary Prospectus).

     (g) The sale of the Securities to the Underwriters by such Selling
Stockholder pursuant to this Agreement, the compliance by such Selling
Stockholder with the other provisions of this Agreement, the Power of Attorney,
the Custody Agreement and the consummation of the other transactions herein
contemplated do not (i) require the consent, approval, authorization,
registration or qualification of or with any governmental authority, except such
as have been obtained, such as may be required under state securities or blue
sky laws and, if the registration statement filed with respect to the Securities
(as amended) is not effective under the Act as of the time of execution hereof,
such as may be required (and shall be obtained as provided in this Agreement)
under the Act, or (ii) conflict with or result in a breach or violation of any
of the terms and provisions of, or constitute a default under any indenture,
mortgage, deed of trust, lease or other agreement or instrument to which such
Selling Stockholder or, if applicable, to which 


                                       11


   12

such Selling Stockholder or any of its subsidiaries is a party or by which such
Selling Stockholder or, if applicable, by which such Selling Stockholder or any
of its subsidiaries or any of such Selling Stockholder's properties are bound,
or the charter documents or by-laws of such Selling Stockholder or any statute
or any judgment, decree, order, rule or regulation of any court or other
governmental authority or any arbitrator applicable to such Selling Stockholder
or, if applicable, to such Selling Stockholder or any of its subsidiaries.

     (h) Each certificate signed by such Selling Stockholder or any officer of
such Selling Stockholder and delivered to the Representatives or counsel for the
Underwriters shall be deemed to be a representation and warranty by such Selling
Stockholder to each Underwriter as to the matters covered thereby.

     2(C). ADDITIONAL REPRESENTATIONS AND WARRANTIES OF THE PRINCIPAL SELLING
STOCKHOLDERS. Each Principal Selling Stockholder represents and warrants to, and
agrees with, each of the several Underwriters, severally and not jointly, that
nothing has come to the attention of such Principal Selling Stockholder that
would cause such Principal Selling Stockholder to believe that:

     (a) any of the Company's representations and warranties set forth in
Section 2(A) hereof was untrue as of the date any such representation or
warranty was made; or

     (b) (1) when any Preliminary Prospectus was filed with the Commission it
(i) did not contain all statements required to be stated therein in accordance
with, or did not comply in all material respects with the requirements of, the
Act and the rules and regulations of the Commission thereunder or (ii) included
any untrue statement of a material fact or omitted to state any material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading;

         (2) when the Registration Statement or any amendment thereto was or is
declared effective, it (i) did not contain or will not contain all statements
required to be stated therein in accordance with, or did not comply or will not
comply in all material respects with the requirements of, the Act and the rules
and regulations of the Commission thereunder or (ii) included or will include
any untrue statement of a material fact or omitted or will omit to state any
material fact necessary to make the statements therein not misleading;

         (3) when the Prospectus or any Term Sheet that is a part thereof or
any amendment or supplement to the Prospectus is filed with the Commission
pursuant to Rule 424(b) (or, if the Prospectus or part thereof or such amendment
or supplement is not required to be so filed, when the Registration Statement or
the amendment thereto containing such amendment or supplement to the Prospectus
was or is declared effective) and on the Firm Closing Date and any Option
Closing Date, the Prospectus, as amended or supplemented at any such time, (i)
did not or will not contain all statements required to be stated therein in
accordance with, or did not or will not comply in all material respects with the
requirements of, the Act and the rules and regulations of the Commission
thereunder or (ii) included or will include any untrue statement of a material
fact or omitted or will omit to state any material fact necessary in order to
make the statements therein, in the light of the circumstances under which they
were made, not misleading;


                                       12

   13

unless, in the case of (b) above, any such statements or omissions made in any
Preliminary Prospectus, the Registration Statement or any amendment thereto or
the Prospectus or any amendment or supplement thereto were made in reliance upon
and in conformity with written information furnished to the Company or any
Principal Selling Stockholder by any Underwriter through the Representatives
specifically for use therein.

     3. PURCHASE, SALE AND DELIVERY OF THE SECURITIES. (a) On the basis of the
representations, warranties, agreements and covenants herein contained and
subject to the terms and conditions herein set forth, (A) the Company agrees to
issue and sell to each of the Underwriters, severally and not jointly, and each
of the Underwriters, severally and not jointly, agrees to purchase from the
Company, at a purchase price of $________ per share, the number of Firm
Securities set forth opposite the name of such Underwriter in Column (a) of
SCHEDULE III hereto and (B) each of the Selling Stockholders, severally and not
jointly, agrees to sell to the Underwriters, severally and not jointly, the
number of Firm Securities set forth opposite the name of such Selling
Stockholder in Column (a) of SCHEDULE I or SCHEDULE II hereto, as the case may
be, and each of the Underwriters, severally and not jointly, agrees to purchase
from the Selling Stockholders, severally and not jointly, the number of Firm
Securities set forth opposite the name of such Underwriter in Column (b) of
SCHEDULE III hereto. One or more certificates in definitive form for the Firm
Securities that the several Underwriters have agreed to purchase hereunder, and
in such denomination or denominations and registered in such name or names as
the Representatives request upon notice to the Company at least 48 hours prior
to the Firm Closing Date, shall be delivered by or on behalf of the Company and
the Selling Stockholders to the Representatives for the respective accounts of
the Underwriters, against payment by or on behalf of the Underwriters of the
purchase price therefor by wire transfer in same-day funds (the "Wired Funds")
to the respective accounts of the Company and the Selling Stockholders. Such
delivery of and payment for the Firm Securities shall be made at the offices of
Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125 High Street, Boston,
Massachusetts 02110 at 9:30 A.M., New York time, on February ___, 1998, or at
such other place, time or date as the Representatives, the Company and the
Selling Stockholders may agree upon or as the Representatives may determine
pursuant to Section 9 hereof, such time and date of delivery against payment
being herein referred to as the "Firm Closing Date". The Company and the Selling
Stockholders will make such certificate or certificates for the Firm Securities
available for checking and packaging by the Representatives at the offices in
New York, New York of the Company's transfer agent or registrar or of Prudential
Securities Incorporated at least 24 hours prior to the Firm Closing Date.

     (b) For the purpose of covering any over-allotments in connection with the
distribution and sale of the Firm Securities as contemplated by the Prospectus,
the Company and each Selling Stockholder, severally and not jointly, hereby
grant to the several Underwriters options to purchase, severally and not
jointly, the number of Option Securities set forth opposite the name of such
Underwriter in Column (c) of SCHEDULE III hereto with respect to the Selling
Stockholders and in Column (d) of SCHEDULE III hereto with respect to the
Company. The options granted hereby (i) shall be exercised FIRST as to the
shares subject to such options which are offered by the Selling Stockholders as
set forth opposite the name of such Selling Stockholder in Column (b) of
SCHEDULE I or SCHEDULE II hereto, as the case may be, PRO RATA among the Selling


                                       13

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Stockholders based upon the percentage obtained for each Selling Stockholder by
computing a fraction the numerator of which is the number of shares so offered
by a Selling Stockholder as set forth opposite the name of such Selling
Stockholder in Column (b) of SCHEDULE I or SCHEDULE II hereto, as the case may
be, and the denominator of which is the total number of shares so offered by all
Selling Stockholders (calculated by figuring the sum of the "total" rows of
Column (b) in each of SCHEDULE I and SCHEDULE II hereto) and SECOND as to the
shares subject to such options which are offered by the Company and (ii) subject
to the preceding clause (i), may be exercised as to all or any part of the
Option Securities from time to time within thirty days after the date of the
Prospectus (or, if such 30th day shall be a Saturday or Sunday or a holiday, on
the next business day thereafter when the New York Stock Exchange is open for
trading). The Underwriters shall not be under any obligation to purchase any of
the Option Securities prior to the exercise of such options. The Representatives
may from time to time exercise the options granted hereby by giving notice in
writing or by telephone (confirmed in writing) to the Selling Stockholder from
whom such option is being exercised (and the Attorneys-in-Fact) and/or the
Company, as the case may be, setting forth the aggregate number of Option
Securities as to which the several Underwriters are then exercising such option
and the date and time for delivery of and payment for such Option Securities.
Any such date of delivery shall be determined by the Representatives but shall
not be earlier than two business days or later than five business days after
such exercise of such option and, in any event, shall not be earlier than the
Firm Closing Date. The time and date set forth in such notice, or such other
time on such other date as the Representatives and the Selling Stockholders (and
the Attorneys-in-Fact) and/or the Company, as the case may be, may agree upon or
as the Representatives may determine pursuant to Section 9 hereof, is herein
called the "Option Closing Date" with respect to such Option Securities. Upon
exercise of such option as provided herein, such Selling Stockholder and/or the
Company, as the case may be, shall become obligated to sell to each of the
several Underwriters, and, subject to the terms and conditions herein set forth,
each of the Underwriters (severally and not jointly) shall become obligated to
purchase from such Selling Stockholder and/or the Company, as the case may be,
the number of Option Securities set forth opposite the name of Underwriter in
Column (c) of SCHEDULE III hereto with respect to the Selling Stockholders and
Column (d) of SCHEDULE III hereto with respect to the Company, in the same
percentage of the total number of the Option Securities as to which the several
Underwriters are then exercising such option as such Underwriter is obligated to
purchase of the aggregate number of Firm Securities, as adjusted by the
Representatives in such manner as they deem advisable to avoid fractional
shares. If such option is exercised as to all or any portion of the Option
Securities, one or more certificates in definitive form for such Option
Securities, and payment therefor, shall be delivered on the related Option
Closing Date in the manner, and upon the terms and conditions, set forth in
paragraph (a) of this Section 3, except that reference therein to the Firm
Securities and the Firm Closing Date shall be deemed, for purposes of this
paragraph (b), to refer to such Option Securities and Option Closing Date,
respectively.

     (c) The Company and each Selling Stockholder hereby acknowledge that the
wire transfer by or on behalf of the Underwriters of the purchase price for any
Securities does not constitute closing of a purchase and sale of the Securities.
Only execution and delivery of a receipt for Securities by the Underwriters
indicates completion of the closing of a purchase of the Securities from the
Company or any Selling Stockholder. Furthermore, in the event that the


                                       14


   15

Underwriters wire funds to the Company or any Selling Stockholder prior to the
completion of the closing of a purchase of Securities, the Company and each
Selling Stockholder hereby acknowledge that until the Underwriters execute and
deliver a receipt for the Securities, by facsimile or otherwise, the Company and
each Selling Stockholder will not be entitled to the wired funds and shall
return the wired funds to the Underwriters as soon as practicable (by wire
transfer of same-day funds) upon demand. In the event that the closing of a
purchase of Securities is not completed and the wire funds are not returned by
the Company or any Selling Stockholder to the Underwriters on the same day the
wired funds were received by the Company or any Selling Stockholder, the Company
and each Selling Stockholder agrees to pay to the Underwriters in respect of
each day the wire funds are not returned by it, in same-day funds, interest on
the amount of such wire funds in an amount representing the Underwriters' cost
of financing as reasonably determined by Prudential Securities Incorporated.

     (d) It is understood that any of you, individually and not as one of the
Representatives, may (but shall not be obligated to) make payment on behalf of
any Underwriter or Underwriters for any of the Securities to be purchased by
such Underwriter or Underwriters. No such payment shall relieve such Underwriter
or Underwriters from any of its or their obligations hereunder.

     4. OFFERING BY THE UNDERWRITERS. Upon your authorization of the release of
the Firm Securities, the several Underwriters propose to offer the Firm
Securities for sale to the public upon the terms set forth in the Prospectus.

     5. COVENANTS OF THE COMPANY AND THE SELLING STOCKHOLDERS.

       (A) The Company covenants and agrees with each of the Underwriters that:

     (a) The Company will use its best efforts to cause the Registration
Statement, if not effective at the time of execution of this Agreement, and any
amendments thereto, to become effective as promptly as possible. If required,
the Company will file the Prospectus or any Term Sheet that constitutes a part
thereof and any amendment or supplement thereto with the Commission in the
manner and within the time period required by Rules 434 and 424(b) under the
Act. During any time when a prospectus relating to the Securities is required to
be delivered under the Act, the Company (i) will comply with all requirements
imposed upon it by the Act and the rules and regulations of the Commission
thereunder to the extent necessary to permit the continuance of sales of or
dealings in the Securities in accordance with the provisions hereof and of the
Prospectus, as then amended or supplemented, and (ii) will not file with the
Commission the prospectus, Term Sheet or the amendment referred to in the second
sentence of Section 2(A)(a) hereof, any amendment or supplement to such
Prospectus, Term Sheet or any amendment to the Registration Statement or any
Rule 462(b) Registration Statement of which the Representatives previously have
been advised and furnished with a copy for a reasonable period of time prior to
the proposed filing and as to which filing the Representatives shall not have
given their consent. The Company will prepare and file with the Commission, in
accordance with the rules and regulations of the Commission, promptly upon
request by the Representatives or counsel for the Underwriters, any amendments
to the Registration Statement or amendments or supplements to the Prospectus
that may be necessary or advisable in connection with the 

                                       15

   16


distribution of the Securities by the several Underwriters, and will use its
best efforts to cause any such amendment to the Registration Statement to be
declared effective by the Commission as promptly as possible. The Company will
advise the Representatives, promptly after receiving notice thereof, of the time
when the Registration Statement or any amendment thereto has been filed or
declared effective or the Prospectus or any amendment or supplement thereto has
been filed and will provide evidence satisfactory to the Representatives of each
such filing or effectiveness.

     (b) The Company will advise the Representatives, promptly after receiving
notice or obtaining knowledge thereof, of (i) the issuance by the Commission of
any stop order suspending the effectiveness of the Original Registration
Statement or any Rule 462(b) Registration Statement or any amendment thereto or
any order preventing or suspending the use of any Preliminary Prospectus or the
Prospectus or any amendment or supplement thereto, (ii) the suspension of the
qualification of the Securities for offering or sale in any jurisdiction, (iii)
the institution, threatening or contemplation of any proceeding for any such
purpose or (iv) any request made by the Commission for amending the Original
Registration Statement or any Rule 462(b) Registration Statement, for amending
or supplementing the Prospectus or for additional information. The Company will
use its best efforts to prevent the issuance of any such stop order and, if any
such stop order is issued, to obtain the withdrawal thereof as promptly as
possible.

     (c) The Company will arrange for the qualification of the Securities for
offering and sale under the securities or blue sky laws of such jurisdictions as
the Representatives may designate and will continue such qualifications in
effect for as long as may be necessary to complete the distribution of the
Securities; PROVIDED, HOWEVER, that in connection therewith, the Company shall
not be required to qualify as a foreign corporation or to execute a general
consent to service of process in any jurisdiction.

     (d) If, at any time prior to the later of (i) the final date when a
prospectus relating to the Securities is required to be delivered under the Act
or (ii) the Option Closing Date, any event occurs as a result of which the
Prospectus, as then amended or supplemented, would include any untrue statement
of a material fact or omit to state a material fact necessary in order to make
the statements therein, in the light of the circumstances under which they were
made, not misleading, or if for any other reason it is necessary at any time to
amend or supplement the Prospectus to comply with the Act or the rules or
regulations of the Commission thereunder, the Company will promptly notify the
Representatives thereof and, subject to Section 5(a) hereof, will prepare and
file with the Commission, at the Company's expense, an amendment to the
Registration Statement or an amendment or supplement to the Prospectus that
corrects such statement or omission or effects such compliance.

     (e) The Company will, without charge, provide (i) to the Representatives
and to counsel for the Underwriters a conformed copy of the registration
statement originally filed with respect to the Securities and each amendment
thereto (in each case including exhibits thereto) or any Rule 462(b)
Registration Statement, certified by the Secretary or an Assistant Secretary of
the Company to be true and complete copies thereof as filed with the Commission
by electronic transmission, (ii) to each other Underwriter, a conformed copy of
such registration statement or 


                                       16


   17

any Rule 462(b) Registration Statement and each amendment thereto (in each case
without exhibits thereto) and (iii) so long as a prospectus relating to the
Securities is required to be delivered under the Act, as many copies of each
Preliminary Prospectus or the Prospectus or any amendment or supplement thereto
as the Representatives may reasonably request; without limiting the application
of clause (iii) of this sentence, the Company, not later than (A) 6:00 PM, New
York City time, on the date of determination of the public offering price, if
such determination occurred at or prior to 10:00 A.M., New York City time, on
such date or (B) 2:00 PM, New York City time, on the business day following the
date of determination of the public offering price, if such determination
occurred after 10:00 A.M., New York City time, on such date, will deliver to the
Underwriters, without charge, as many copies of the Prospectus and any amendment
or supplement thereto as the Representatives may reasonably request for purposes
of confirming orders that are expected to settle on the Firm Closing Date.

     (f) The Company, as soon as practicable, will make generally available to
its Stockholders and to the Representatives a consolidated earnings statement of
the Company and its subsidiaries that satisfies the provisions of Section 11(a)
of the Act and Rule 158 thereunder.

     (g) The Company will apply the net proceeds from the sale of the Securities
as set forth under "Use of Proceeds" in the Prospectus.

     (h) The Company will not, directly or indirectly, without the prior written
consent of Prudential Securities Incorporated, on behalf of the Underwriters,
offer, sell, offer to sell, contract to sell, pledge, grant any option to
purchase or otherwise sell or dispose (or announce any offer, sale, offer of
sale, contract of sale, pledge, grant of any option to purchase or other sale or
disposition) of any shares of Common Stock or any securities convertible into,
or exchangeable or exercisable for, shares of Common Stock for a period of 180
days after the date hereof, and except for issuances pursuant to the exercise of
employee stock options pursuant to the Company's stock option plans and its
employee stock purchase plan in effect as of the date hereof. Prudential
Securities Incorporated may, in its sole discretion, at any time and without
prior notice, release all or any portion of the shares of Common Stock subject
to such agreement.

     (i) The Company will not, directly or indirectly, (i) take any action
designed to cause or to result in, or that has constituted or which might
reasonably be expected to constitute, the stabilization or manipulation of the
price of any security of the Company to facilitate the sale or resale of the
Securities or (ii) (A) sell, bid for, purchase, or pay anyone any compensation
for soliciting purchases of, the Securities or (B) pay or agree to pay to any
person any compensation for soliciting another to purchase any other securities
of the Company (except for the sale of Securities by the Selling Stockholders
under this Agreement).

     (j) The Company will use all commercially reasonable efforts to obtain the
agreements described in Section 7(g) hereof prior to the Firm Closing Date.

     (k) If at any time during the 25-day period after the Registration
Statement becomes effective or the period prior to the Option Closing Date, any
rumor, publication or event relating to or affecting the Company shall occur as
a result of which in your opinion the market price of 

                                       17

   18

the Common Stock has been or is likely to be materially affected (regardless of
whether such rumor, publication or event necessitates a supplement to or
amendment of the Prospectus), the Company will, after notice from you advising
the Company to the effect set forth above and with our consent (which consent
shall not be unreasonably withheld or delayed), forthwith prepare, consult with
you concerning the substance of, and disseminate a press release or other public
statement, reasonably satisfactory to you, responding to or commenting on such
rumor, publication or event.

     (l) If the Company elects to rely on Rule 462(b), the Company shall both
file a Rule 462(b) Registration Statement with the Commission in compliance with
Rule 462(b) and pay the applicable fees in accordance with Rule 111 promulgated
under the Act by the earlier of (i) 10:00 P.M. Eastern time on the date of this
Agreement and (ii) the time confirmations are sent or given, as specified by
Rule 462(b)(2).

     (m) The Company will cause the Securities to be duly included for quotation
on The Nasdaq Stock Market's National Market (the "Nasdaq National Market")
prior to the Firm Closing Date. The Company will use its best efforts to ensure
that the Securities remain included for quotation on the Nasdaq National Market
or are included for quotation on another national quotation system or listed on
a national securities exchange following the Firm Closing Date.

     (n) The Company will conduct its operations in a manner that will not
subject it to registration as an investment company under the Investment Company
Act of 1940, as amended, and this transaction will not cause the Company to
become an investment company subject to registration under such Act.

       (B) Each of the Selling Stockholders covenants and agrees with each of 
the Underwriters that:

     (a) such Selling Stockholder will not, directly or indirectly, without the
prior written consent of Prudential Securities Incorporated, offer, sell, offer
to sell, contract to sell, pledge, grant any option to purchase or otherwise
sell or dispose (or announce any offer, sale, offer of sale, contract of sale,
pledge, grant of any option to purchase or other sale or disposition) of any
Securities legally or beneficially owned by such Selling Stockholder or any
securities convertible into, or exchangeable or exercisable for, Securities for
a period of 180 days after the date hereof. Prudential Securities Incorporated
may, in its sole discretion, at any time and without prior notice, release all
or any portion of the shares of Common Stock subject to such agreements;
PROVIDED, HOWEVER, that notwithstanding the foregoing restrictions on transfer
(collectively, the "Restrictions"), such Selling Stockholder shall be permitted
to make the following transfers: (i) transfers of shares of Common Stock made by
gift, provided the donee thereof agrees in writing to be bound by the
Restrictions; (ii) transfers of shares of Common Stock to members of such
Selling Stockholder's immediate family or to a trust or similar estate planning
entity established for the benefit of such Selling Stockholder or a member of
such Selling Stockholder's immediate family, provided that each transferee
agrees in writing to be bound by the Restrictions; (iii) transfers of shares of
Common Stock to the transferor's affiliates, as such term is defined in Rule 405
under the Act, provided that each transferee agrees in writing to be bound by
the 

                                       18

   19

Restrictions; (iv) transfers of shares of Common Stock made with the prior
written consent of Prudential Securities Incorporated on behalf of the
Underwriters; and (v) transfers of shares of Common Stock pursuant to the
Registration Statement.

     (b) such Selling Stockholder will not, directly or indirectly, (i) take any
action designed to cause or result in, or that has constituted or which might
reasonably be expected to constitute, the stabilization or manipulation of the
price of any security of the Company to facilitate the sale or resale of the
Securities or (ii) (A) sell, bid for, purchase, or pay anyone any compensation
for soliciting purchases of, the Securities or (B) pay or agree to pay to any
person any compensation for soliciting another to purchase any other securities
of the Company (except for the sale of Securities by the Selling Stockholders
under this Agreement).

     (c) in order to document the Underwriters' compliance with the reporting
and withholding provisions of the Internal Revenue Code of 1986, as amended,
with respect to the transactions herein contemplated, such Selling Stockholder
agrees to deliver to you prior to or on the Firm Closing Date, as hereinafter
defined, a properly completed and executed United States Treasury Department
Form W-8 or W-9 (or other applicable form of statement specified by Treasury
Department regulations in lieu thereof).

     6. EXPENSES. The Company will pay all costs and expenses incident to the
performance of the obligations of the Company and the Selling Stockholders under
this Agreement, whether or not the transactions contemplated herein are
consummated or this Agreement is terminated pursuant to Section 11 hereof,
including all costs and expenses incident to (i) the printing or other
production of documents with respect to the transactions, including any costs of
printing the registration statement originally filed with respect to the
Securities and any amendment thereto, any Rule 462(b) Registration Statement,
any Preliminary Prospectus and the Prospectus and any amendment or supplement
thereto, this Agreement and any blue sky memoranda, (ii) all arrangements
relating to the delivery to the Underwriters of copies of the foregoing
documents, (iii) the fees and disbursements of the counsel, the accountants and
any other experts or advisors retained by the Company and, in accordance with
applicable agreements, the Selling Stockholders, (iv) preparation, issuance and
delivery to the Underwriters of any certificates evidencing the Securities,
including transfer agent's and registrar's fees, (v) the qualification of the
Securities under state securities and blue sky laws, including filing fees and
fees and disbursements of counsel for the Underwriters relating thereto, (vi)
the filing fees of the Commission and the National Association of Securities
Dealers, Inc. relating to the Securities, including filing fees and fees and
disbursements of counsel for the Underwriters relating thereto, (vii) any
quotation of the Securities on the Nasdaq National Market, (viii) all expenses
of the Company's officers in connection with any meetings with prospective
investors in the Securities and (ix) advertising relating to the offering of the
Securities which has been specifically requested by the Company and not the
Underwriters. If the sale of the Securities provided for herein is not
consummated because any condition to the obligations of the Underwriters set
forth in Section 7 hereof is not satisfied, because this Agreement is terminated
pursuant to Section 11(a)(i) and (ii) hereof or because of any failure, refusal
or inability on the 


                                       19

   20

part of the Company to perform all obligations and satisfy all conditions on its
part to be performed or satisfied hereunder other than by reason of a default by
any of the Underwriters, the Company will reimburse the Underwriters severally
upon demand for all out-of-pocket expenses (including counsel fees and
disbursements) that shall have been incurred by them in connection with the
proposed purchase and sale of the Securities. The Company shall not in any event
be liable to any of the Underwriters for the loss of anticipated profits from
the transactions covered by this Agreement.

     Each Selling Stockholder will pay any transfer taxes attributable to the
sale by such Selling Stockholder of the Securities it sells hereunder.

     7. CONDITIONS OF THE UNDERWRITERS' OBLIGATIONS. The obligations of the
several Underwriters to purchase and pay for the Firm Securities shall be
subject, in the Representatives' sole discretion, to the accuracy of the
representations and warranties of the Company and the Selling Stockholders
contained herein as of the date hereof and as of the Firm Closing Date, as if
made on and as of the Firm Closing Date, to the accuracy of the statements of
the Company's officers made pursuant to the provisions hereof, to the
performance by the Company and the Selling Stockholders of their respective
covenants and agreements hereunder and to the following additional conditions:

     (a) If the Original Registration Statement or any amendment thereto filed
prior to the Firm Closing Date has not been declared effective as of the time of
execution hereof, the Original Registration Statement or such amendment and, if
the Company has elected to rely upon Rule 462(b), the Rule 462(b) Registration
Statement shall have been declared effective not later than the earlier of (i)
11:00 A.M., New York time, on the date on which the amendment to the
registration statement originally filed with respect to the Securities or to the
Registration Statement, as the case may be, containing information regarding the
initial public offering price of the Securities has been filed with the
Commission and (ii) the time confirmations are sent or given as specified by
Rule 462(b)(2), or with respect to the Original Registration Statement, or such
later time and date as shall have been consented to by the Representatives; if
required, the Prospectus or any Term Sheet that constitutes a part thereof and
any amendment or supplement thereto shall have been filed with the Commission in
the manner and within the time period required by Rules 434 and 424(b) under the
Act; no stop order suspending the effectiveness of the Registration Statement or
any amendment thereto shall have been issued, and no proceedings for that
purpose shall have been instituted or threatened or, to the knowledge of the
Company, the Selling Stockholders or the Representatives, shall be contemplated
by the Commission; and the Company and each Selling Stockholder shall have
complied with any request of the Commission for additional information (to be
included in the Registration Statement or the Prospectus or otherwise).

     (b)(1) The Representatives shall have received an opinion, dated the Firm
Closing Date, of Hutchins, Wheeler & Dittmar, A Professional Corporation,
counsel for the Company, to the effect that:

          (i) the Company and each of its subsidiaries which is organized in the
     United


                                       20

   21

     States (the "U.S. Subsidiaries") have been duly organized and are validly
     existing as corporations in good standing under the laws of their
     respective jurisdictions of incorporation;

          (ii) the Company and each of the U.S. Subsidiaries have the corporate
     power and authority to own or lease their respective properties and conduct
     their respective businesses as described in the Registration Statement and
     the Prospectus, and the Company has the corporate power and authority to
     enter into this Agreement and to carry out all the terms and provisions
     hereof to be carried out by it;

          (iii) the issued shares of capital stock of each of the U.S.
     Subsidiaries have been duly authorized and validly issued, are fully paid
     and nonassessable and, except as otherwise set forth in the Prospectus, are
     owned beneficially by the Company free and clear of any perfected security
     interests or, to the knowledge of such counsel, any other security
     interests, liens, encumbrances, equities or claims;

          (iv) after giving effect to the amendment to the Company's Articles of
     Organization described in the Prospectus, the Company's authorized, issued
     and outstanding capitalization is as set forth in the Prospectus; all of
     the issued shares of capital stock of the Company have been duly authorized
     and validly issued and are fully paid and nonassessable, have been issued
     in compliance with all applicable federal and state securities laws and
     were not issued in violation of or subject to any preemptive rights or
     other rights to subscribe for or purchase securities; the Securities to be
     issued by the Company pursuant to this Agreement have been duly authorized
     by all necessary corporate action of the Company and, when issued and
     delivered to and paid for by the Underwriters pursuant to this Agreement,
     will be validly issued, fully paid and nonassessable; the Securities have
     been duly included for trading on the Nasdaq National Market; no holders of
     outstanding shares of capital stock of the Company are entitled as such to
     any preemptive or other rights to subscribe for any of the Securities under
     the Articles of Organization or By-Laws, as in effect on the date of this
     opinion, of the Company, or under any statute, rule or regulation, or under
     any agreement known to such counsel; and no holders of securities of the
     Company are entitled to have such securities registered under the
     Registration Statement pursuant to any agreement known to such counsel,
     other than those holders whose Securities are included in the Registration
     Statement or who have waived such rights;

          (v) the statements set forth under the heading "Description of Capital
     Stock" in the Prospectus, insofar as such statements purport to summarize
     certain provisions of the capital stock of the Company, provide a fair
     summary of such provisions; and the statements set forth under the heading
     "Management -- Stock Option and Stock Purchase Plans";

          (vi) the execution and delivery of this Agreement have been duly
     authorized by all necessary corporate action of the Company and this
     Agreement has been duly executed and delivered by the Company;


                                       21


   22

          (vii) (A) to the knowledge of such counsel after due inquiry
     consisting solely of inquiry of the executive officers of the Company and a
     docket search in state courts in Massachusetts and federal courts sitting
     in Massachusetts, no legal or governmental proceedings are pending to which
     the Company or any of the U.S. Subsidiaries is a party or to which the
     property of the Company or any of the U.S. Subsidiaries is subject that are
     required to be described in the Registration Statement or the Prospectus
     and are not described therein, and, to the knowledge of such counsel, no
     such proceedings have been threatened against the Company or any of the
     U.S. Subsidiaries or with respect to any of their respective properties and
     (B) no contract or other document known to such counsel is required to be
     described in the Registration Statement or the Prospectus or to be filed as
     an exhibit to the Registration Statement that is not described therein or
     filed as required;

          (viii) the issuance, offering and sale of the Securities to the
     Underwriters by the Company pursuant to this Agreement, the compliance by
     the Company with the other provisions of this Agreement and the
     consummation of the other transactions herein contemplated do not (A)
     require the consent, approval, authorization, registration or qualification
     of or with any governmental authority, except such as have been obtained
     and such as may be required under state securities or blue sky laws, or (B)
     conflict with or result in a breach or violation of any of the terms and
     provisions of, or constitute a default under, any indenture, mortgage, deed
     of trust, lease or other agreement or instrument, known to such counsel all
     of which may be listed in an exhibit to such counsel's opinion, to which
     the Company or any of the U.S. Subsidiaries is a party or by which the
     Company or any of the U.S. Subsidiaries or any of their respective
     properties are bound, or the charter documents or by-laws of the Company or
     any of the U.S. Subsidiaries, or any statute or any judgment, decree,
     order, rule or regulation of any court or other governmental authority or
     any arbitrator known to such counsel and applicable to the Company or U.S.
     Subsidiaries;

          (ix) such counsel has been informed by the Commission that the
     Registration Statement is effective under the Act; any required filing of
     the Prospectus, or any Term Sheet that constitutes a part thereof, pursuant
     to Rules 434 and 424(b) has been made in the manner and within the time
     period required by Rules 434 and 424(b); such counsel has been informed by
     the Commission that no stop order suspending the effectiveness of the
     Registration Statement or any amendment thereto has been issued, and, to
     such counsel's knowledge, no proceedings for that purpose have been
     instituted or threatened or, are contemplated by the Commission;

          (x) the Registration Statement originally filed with respect to the
     Securities and each amendment thereto, any Rule 462(b) Registration
     Statement and the Prospectus (in each case, other than the financial
     statements and other financial information contained therein, as to which
     such counsel need express no opinion) comply as to form in all material
     respects with the applicable requirements of the Act and the rules and
     regulations of the Commission thereunder; and


                                       22


   23


          (xi) if the Company elects to rely on Rule 434, the Prospectus is not
     "materially different", as such term is used in Rule 434, from the
     prospectus included in the Registration Statement at the time of its
     effectiveness or an effective post-effective amendment thereto (including
     such information that is permitted to be omitted pursuant to Rule 430A).

     Such counsel shall also state that they have no reason to believe that the
Registration Statement, as of its effective date, contained any untrue statement
of a material fact or omitted to state any material fact required to be stated
therein or necessary to make the statements therein not misleading or that the
Prospectus, as of its date or the date of such opinion, included or includes any
untrue statement of a material fact or omitted or omits to state a material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading.

     (b)(2) The Representatives shall have received an opinion, dated the Firm
Closing Date, of Hutchins, Wheeler & Dittmar, counsel for the Selling
Stockholders, to the effect that:

          (i) each Selling Stockholder has full corporate, partnership or trust
     power, as applicable, to enter into this Agreement, the Custody Agreement
     and the Power-of-Attorney and to sell, transfer and deliver the Securities
     being sold by such Selling Stockholder hereunder in the manner provided in
     this Agreement and to perform its obligations under the Custody Agreement;
     if such Selling Stockholder is a corporation, the execution and delivery of
     this Agreement, the Custody Agreement and the Power-of-Attorney have been
     duly authorized by all necessary corporate action of each Selling
     Stockholder; this Agreement, the Custody Agreement and the
     Power-of-Attorney have been duly executed and delivered by each Selling
     Stockholder; the Custody Agreement and the Power-of-Attorney are the legal,
     valid, binding and enforceable instruments of each Selling Stockholder,
     subject to applicable bankruptcy, insolvency and similar laws affecting
     creditors' rights generally and subject, as to enforceability, to general
     principles of equity (regardless of whether enforcement is sought in a
     proceeding in equity or at law);

          (ii) when the Underwriters obtain control of the Securities to be sold
     by the Selling Stockholders, assuming that the Underwriters purchased such
     Securities for value and without notice of any adverse claim to such
     Securities within the meaning of Section 8-102 of the Uniform Commercial
     Code as in effect in the Commonwealth of Massachusetts, the Underwriters
     will have acquired all rights of the Selling Stockholders in such
     Securities free of any adverse claim;

          (iii) the sale of the Securities to the Underwriters by each Selling
     Stockholder pursuant to this Agreement, the compliance by such Selling
     Stockholder with the other provisions of this Agreement, the Custody
     Agreement and the consummation of the other transactions herein
     contemplated do not (i) require the consent, approval, authorization,
     registration or qualification of or with any governmental authority, except
     such as have been obtained and such as may be required under state
     securities or blue sky laws, or (ii) 


                                       23

   24

     conflict with or result in a breach or violation of any of the terms and
     provisions of, or constitute a default under any indenture, mortgage, deed
     of trust, lease or other agreement or instrument to which such Selling
     Stockholder is a party or by which such Selling Stockholder or any of such
     Selling Stockholder's properties are bound, or the charter documents or
     by-laws of such Selling Stockholder or any of its subsidiaries or any
     statute or any judgment, decree, order, rule or regulation of any court or
     other governmental authority or any arbitrator applicable to such Selling
     Stockholder.

     In rendering any such opinion, such counsel may rely, as to matters of
fact, to the extent such counsel deems proper, on certificates of responsible
officers of the Company and public officials, the Selling Stockholders and
representations and warranties of the Company and the Selling Stockholders
contained herein, in the Custody Agreements and in the Powers of Attorney.

     (b)(3) The Representatives shall have received opinions of counsel, dated
the Firm Closing Date, from local counsel to each of the Company's subsidiaries
organized outside of the United States in form and substance satisfactory to the
Representatives and counsel to the Representatives.

     References to the Registration Statement and the Prospectus in this
paragraph (b) shall include any amendment or supplement thereto at the date of
such opinion.

     (c) The Representatives shall have received an opinion, dated the Firm
Closing Date, of Testa, Hurwitz & Thibeault, LLP, counsel for the Underwriters,
with respect to the issuance and sale of the Firm Securities, the Registration
Statement and the Prospectus, and such other related matters as the
Representatives may reasonably require, and the Company shall have furnished to
such counsel such documents as they may reasonably request for the purpose of
enabling them to pass upon such matters.

     (d) The Representatives shall have received from Coopers & Lybrand L.L.P. a
letter or letters dated, respectively, the date hereof and the Firm Closing
Date, in form and substance satisfactory to the Representatives, to the effect
that:

          (i) they are independent accountants with respect to the Company and
     its consolidated subsidiaries within the meaning of the Act and the
     applicable rules and regulations thereunder;

          (ii) in their opinion, the audited consolidated financial statements
     and schedules examined by them and included in the Registration Statement
     and the Prospectus comply in form in all material respects with the
     applicable accounting requirements of the Act and the related published
     rules and regulations;

          (iii) on the basis of a reading of the latest available interim
     unaudited consolidated financial statements of the Company, a reading of
     the unaudited amounts for revenues, cost of revenues, net income before
     income taxes and total and per share amounts of 


                                       24

   25

     net income as of and for the three months ended September 30, 1997 and of
     the unaudited consolidated financial statements of the Company and its
     consolidated subsidiaries for the periods from which such amounts are
     derived, carrying out certain specified procedures (which do not constitute
     an examination made in accordance with generally accepted auditing
     standards) that would not necessarily reveal matters of significance with
     respect to the comments set forth in this paragraph (iii), a reading of the
     minute books of the stockholders, the board of directors and any committees
     thereof of the Company and each of its consolidated subsidiaries, and
     inquiries of certain officials of the Company and its consolidated
     subsidiaries who have responsibility for financial and accounting matters,
     nothing came to their attention that caused them to believe that:

          (A) the unaudited consolidated financial statements of the Company
          included in the Registration Statement and the Prospectus do not
          comply in form in all material respects with the applicable accounting
          requirements of the Act and the related published rules and
          regulations thereunder or are not in conformity with generally
          accepted accounting principles applied on a basis substantially
          consistent with that of the audited consolidated financial statements
          included in the Registration Statement and the Prospectus;

          (B) the unaudited amounts for revenues, cost of revenues, net income
          before income taxes and total and per share amounts of net income
          included in the Registration Statement and the Prospectus do not agree
          with the amounts set forth in any unaudited consolidated financial
          statements for those same periods or are not in conformity with
          generally accepted accounting principles applied on a basis
          substantially consistent with that of the corresponding amounts in the
          audited consolidated financial statements included in the Registration
          Statement and the Prospectus; and

          (C) at a specific date not more than five business days prior to the
          date of such letter, there were any changes in the capital stock or
          long-term debt of the Company and its consolidated subsidiaries or any
          decreases in net current assets or stockholders' equity of the Company
          and its consolidated subsidiaries, in each case compared with amounts
          shown on the September 30, 1997 unaudited consolidated balance sheet
          included in the Registration Statement and the Prospectus, or for the
          period from November 1, 1997 to such specified date there were any
          decreases, as compared with the corresponding period in the preceding
          year, in revenues, cost of revenues, net income before income taxes or
          total or per share amounts of net income of the Company and its
          consolidated subsidiaries, except in all instances for changes,
          decreases or increases set forth in such letter; and

               (iv) they have carried out certain specified procedures, not
constituting an audit, with respect to certain amounts, percentages and
financial information that are derived from the general accounting records of
the Company and its consolidated subsidiaries and are included in the
Registration Statement and the Prospectus under the captions Prospectus Summary,
Risk Factors, Use of Proceeds, Capitalization, Selected Financial Data,
Management's Discussion and Analysis of Financial Condition and Results of
Operations, Business and Description of Capital Stock, and in Exhibit 11 to the
Registration Statement, and have compared such amounts, percentages and
financial information with such records of the Company and its consolidated
subsidiaries and with information derived from such records and have found them
to be in 


                                       25

   26

agreement, excluding any questions of legal interpretation.

     In the event that the letters referred to above set forth any such changes,
decreases or increases, it shall be a further condition to the obligations of
the Underwriters that (A) such letters shall be accompanied by a written
explanation of the Company as to the significance thereof, unless the
Representatives deem such explanation unnecessary, and (B) such changes,
decreases or increases do not, in the sole judgment of the Representatives, make
it impractical or inadvisable to proceed with the purchase and delivery of the
Securities as contemplated by the Registration Statement, as amended as of the
date hereof.

     References to the Registration Statement and the Prospectus in this
paragraph (d) with respect to either letter referred to above shall include any
amendment or supplement thereto at the date of such letter.

     (e) The Representatives shall have received a certificate, dated the Firm
Closing Date, of the principal executive officer and the principal financial or
accounting officer of the Company to the effect that:

          (i) the representations and warranties of the Company in this
     Agreement are true and correct as if made on and as of the Firm Closing
     Date; the Registration Statement, as amended as of the Firm Closing Date,
     does not include any untrue statement of a material fact or omit to state
     any material fact necessary to make the statements therein not misleading,
     and the Prospectus, as amended or supplemented as of the Firm Closing Date,
     does not include any untrue statement of a material fact or omit to state
     any material fact necessary in order to make the statements therein, in the
     light of the circumstances under which they were made, not misleading; and
     the Company has performed all covenants and agreements and satisfied all
     conditions on its part to be performed or satisfied at or prior to the Firm
     Closing Date;

          (ii) no stop order suspending the effectiveness of the Registration
     Statement or any amendment thereto has been issued, and no proceedings for
     that purpose have been instituted or threatened or, to the best of the
     Company's knowledge, are contemplated by the Commission; and

          (iii) subsequent to the respective dates as of which information is
     given in the Registration Statement and the Prospectus, neither the Company
     nor any of its subsidiaries has sustained any material loss or interference
     with their respective businesses or properties from fire, flood, hurricane,
     accident or other calamity, whether or not covered by insurance, or from
     any labor dispute or any legal or governmental proceeding, and there has
     not been any material adverse change, or any development involving a
     prospective material adverse change, in the condition (financial or
     otherwise), management, business prospects, net worth or results of
     operations of the Company or any of its subsidiaries, except in each case
     as described in or contemplated by the Prospectus (exclusive of any
     amendment or supplement thereto).


                                       26

   27

         (f) The Representatives shall have received a certificate, dated the
Firm Closing Date, from each Selling Stockholder, signed by one of the
Attorneys-in-Fact, to the effect that:

               (i) the representations and warranties of such Selling
          Stockholder in this Agreement are true and correct as if made on and
          as of the Firm Closing Date;

               (ii) to the extent that any statements or omissions are made in
          the Registration Statement, any Preliminary Prospectus, the Prospectus
          or any amendment or supplement thereto in reliance upon and in
          conformity with written information furnished to the Company by such
          Selling Stockholder specifically for use therein, the Registration
          Statement, as amended as of the Firm Closing Date, does not include
          any untrue statement of a material fact or omit to state any material
          fact necessary to make the statements therein not misleading, and the
          Prospectus, as amended or supplemented as of the Firm Closing Date,
          does not include any untrue statement of a material fact or omit to
          state any material fact necessary in order to make the statements
          therein, in the light of the circumstances under which they were made,
          not misleading; and

               (iii) such Selling Stockholder has performed all covenants and
          agreements on its part to be performed or satisfied at or prior to the
          Firm Closing Date.

     (g) The Representatives shall have received (subject to certain limited
exceptions to be agreed upon by the Underwriters) from each person who is a
director or executive officer of the Company or who owns 5,000 shares of Common
Stock or more an agreement to the effect that such person will not, directly or
indirectly, without the prior written consent of Prudential Securities
Incorporated, on behalf of the Underwriters, offer, sell, offer to sell,
contract to sell, pledge, grant any option to purchase or otherwise sell or
dispose (or announce any offer, sale, offer of sale, contract of sale, pledge,
grant of an option to purchase or other sale or disposition) of any shares of
Common Stock or any securities convertible into, or exchangeable or exercisable
for, shares of Common Stock for a period of 180 days after the date of this
Agreement; PROVIDED, HOWEVER, that notwithstanding the Restrictions, such person
shall be permitted to make the following transfers: (i) transfers of shares of
Common Stock made by gift, provided the donee thereof agrees in writing to be
bound by the Restrictions; (ii) transfers of shares of Common Stock to members
of such person's immediate family or to a trust or similar estate planning
entity established for the benefit of such person or a member of such person's
immediate family, provided that each transferee agrees in writing to be bound by
the Restrictions; (iii) transfers of shares of Common Stock to the transferor's
affiliates, as such term is defined in Rule 405 under the Act, provided that
each transferee agrees in writing to be bound by the Restrictions; (iv)
transfers of shares of Common Stock made with the prior written consent of
Prudential Securities Incorporated on behalf of the Underwriters; and (v)
transfers of shares of Common Stock pursuant to the Registration Statement.
Prudential Securities Incorporated may, in its sole discretion, at any time and
without prior notice, release all or any portion of the shares of Common Stock
subject to such agreements.

     (h) On or before the Firm Closing Date, the Representatives and counsel for
the Underwriters shall have received such further certificates, documents or
other information as they 


                                       27

   28


may have reasonably requested from the Company and the Selling Stockholders.

     (i) Prior to the commencement of the offering of the Securities, the
Securities shall have been included for trading on the Nasdaq National Market.

     All opinions, certificates, letters and documents delivered pursuant to
this Agreement will comply with the provisions hereof only if they are
reasonably satisfactory in all material respects to the Representatives and
counsel for the Underwriters. The Company and the Selling Stockholders shall
furnish to the Representatives such conformed copies of such opinions,
certificates, letters and documents in such quantities as the Representatives
and counsel for the Underwriters shall reasonably request.

     The respective obligations of the several Underwriters to purchase and pay
for any Option Securities shall be subject, in their discretion, to each of the
foregoing conditions to purchase the Firm Securities, except that all references
to the Firm Securities and the Firm Closing Date shall be deemed to refer to
such Option Securities and the related Option Closing Date, respectively.

     8. INDEMNIFICATION AND CONTRIBUTION. (a) The Company agrees to indemnify
and hold harmless each Underwriter and each person, if any, who controls any
Underwriter within the meaning of Section 15 of the Act or Section 20 of the
Securities Exchange Act of 1934 (the "Exchange Act"), against any losses,
claims, damages or liabilities, joint or several, to which such Underwriter or
such controlling person may become subject under the Act or otherwise, insofar
as such losses, claims, damages or liabilities (or actions in respect thereof)
arise out of or are based upon:

               (i) any untrue statement or alleged untrue statement made by the
          Company in Section 2 of this Agreement,

               (ii) any untrue statement or alleged untrue statement of any
          material fact contained in (A) the Registration Statement or any
          amendment thereto, any Preliminary Prospectus or the Prospectus or any
          amendment or supplement thereto or (B) any application or other
          document, or any amendment or supplement thereto, executed by the
          Company or based upon written information furnished by or on behalf of
          the Company filed in any jurisdiction in order to qualify the
          Securities under the securities or blue sky laws thereof or filed with
          the Commission or any securities association or securities exchange
          (each an "Application"),

               (iii) the omission or alleged omission to state in the
          Registration Statement or any amendment thereto, any Preliminary
          Prospectus or the Prospectus or any amendment or supplement thereto,
          or any Application, a material fact required to be stated therein or
          necessary to make the statements therein not misleading, or

               (iv) any untrue statement or alleged untrue statement of any
          material fact contained in any audio or visual materials used in
          connection with the marketing of the Securities, including without
          limitation, slides, videos, films, and tape recordings,


                                       28


   29

     and will reimburse, as incurred, each Underwriter and each such controlling
person for any legal or other expenses reasonably incurred by such Underwriter
or such controlling person in connection with investigating, defending against
or appearing as a third-party witness in connection with any such loss, claim,
damage, liability or action; PROVIDED, HOWEVER, that the Company will not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon any untrue statement or alleged untrue
statement or omission or alleged omission made in such registration statement or
any amendment thereto, any Preliminary Prospectus, the Prospectus or any
amendment or supplement thereto or any Application in reliance upon and in
conformity with written information furnished to the Company by such Underwriter
through the Representatives specifically for use therein; and PROVIDED, FURTHER,
that the Company will not be liable to any Underwriter or any person controlling
such Underwriter with respect to any such untrue statement or omission made in
any Preliminary Prospectus that is corrected in the Prospectus (or any amendment
or supplement thereto) if the person asserting any such loss, claim, damage or
liability purchased Securities from such Underwriter but was not sent or given a
copy of the Prospectus (as amended or supplemented) at or prior to the written
confirmation of the sale of such Securities to such person in any case where
such delivery of the Prospectus (as amended or supplemented) is required by the
Act, unless such failure to deliver the Prospectus (as amended or supplemented)
was a result of noncompliance by the Company with Section 5A(d) and (e) of this
Agreement. This indemnity agreement will be in addition to any liability which
the Company may otherwise have. The Company will not, without the prior written
consent of the Underwriters purchasing, in the aggregate, more than fifty
percent (50%) of the Securities, settle or compromise or consent to the entry of
any judgment in any pending or threatened claim, action, suit or proceeding in
respect of which indemnification may be sought hereunder (whether or not any
such Underwriter or any person who controls any such Underwriter within the
meaning of Section 15 of the Act or Section 20 of the Exchange Act is a party to
such claim, action, suit or proceeding), unless such settlement, compromise or
consent includes an unconditional release of all of the Underwriters and such
controlling persons from all liability arising out of such claim, action, suit
or proceeding.

     (b) Each Principal Selling Stockholder, severally and not jointly, agrees
to indemnify and hold harmless each Underwriter and each person, if any, who
controls any Underwriter within the meaning of Section 15 of the Act or Section
20 of the Exchange Act, against any losses, claims, damages or liabilities,
joint or several, to which such Underwriter or such controlling person may
become subject under the Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are based
upon any untrue statement or alleged untrue statement made by such Principal
Selling Stockholder in Section 2(B) or (C) of this Agreement, and will
reimburse, as incurred, each Underwriter and each such controlling person for
any legal or other expenses reasonably incurred by such Underwriter or such
controlling person in connection with investigating, defending against or
appearing as a third-party witness in connection with any such loss, claim,
damage, liability or action; PROVIDED, HOWEVER, that such Principal Selling
Stockholder will not be liable to any Underwriter or any person controlling such
Underwriter with respect to any such untrue statement or omission made in any
Preliminary Prospectus that is corrected in the Prospectus (or any amendment or
supplement thereto) if the person asserting any such loss, claim, damage or
liability purchased Securities from such 


                                       29

   30

Underwriter but was not sent or given a copy of the Prospectus (as amended or
supplemented) at or prior to the written confirmation of the sale of such
Securities to such person in any case where such delivery of the Prospectus (as
amended or supplemented) is required by the Act, unless such failure to deliver
the Prospectus (as amended or supplemented) was a result of noncompliance by the
Company with Section 5A(d) and (e) of this Agreement. This indemnity agreement
will be in addition to any liability which such Principal Selling Stockholder
may otherwise have. No Principal Selling Stockholder will, without the prior
written consent of the Underwriters purchasing, in the aggregate, more than
fifty percent (50%) of the Securities, settle or compromise or consent to the
entry of any judgment in any pending or threatened claim, action, suit or
proceeding in respect of which indemnification may be sought hereunder (whether
or not any such Underwriter or any person who controls any such Underwriter
within the meaning of Section 15 of the Act or Section 20 of the Exchange Act is
a party to such claim, action, suit or proceeding), unless such settlement,
compromise or consent includes an unconditional release of all of the
Underwriters and such controlling persons from all liability arising out of such
claim, action, suit or proceeding.

     (c) Each Additional Selling Stockholder, severally, and not jointly, agrees
to indemnify and hold harmless the Company, each of its directors, each of its
officers who signs the Registration Statement, each Underwriter and each person
who controls the Company or any Underwriter within the meaning of the Act or the
Exchange Act and each other Additional Selling Stockholder against any losses,
claims, damages or liabilities to which the Company, any such director, officer,
such Underwriter or any such controlling person may become subject under the
Act, the Exchange Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or alleged untrue statement of any material fact contained
in the Registration Statement or any amendment thereto, any Preliminary
Prospectus or the Prospectus or any amendment or supplement thereto, or any
Application or (ii) the omission or the alleged omission to state therein a
material fact required to be stated in the Registration Statement or any
amendment thereto, any Preliminary Prospectus or the Prospectus or any amendment
or supplement thereto, or any Application or necessary to make the statements
therein not misleading, in each case to the extent, but only to the extent, that
such untrue statement or alleged untrue statement or omission or alleged
omission was made in reliance upon and in conformity with written information
furnished to the Company by such Additional Selling Stockholder for use therein;
PROVIDED, HOWEVER, that such Additional Selling Stockholder will not be liable
to any Underwriter or any person controlling such Underwriter with respect to
any such untrue statement or omission made in any Preliminary Prospectus that is
corrected in the Prospectus (or any amendment or supplement thereto) if the
person asserting any such loss, claim, damage or liability purchased Securities
from such 


                                       30

   31

Underwriter but was not sent or given a copy of the Prospectus (as amended or
supplemented) at or prior to the written confirmation of the sale of such
Securities to such person in any case where such delivery of the Prospectus (as
amended or supplemented) is required by the Act, unless such failure to deliver
the Prospectus (as amended or supplemented) was a result of noncompliance by the
Company with Section 5A(d) and (e) of this Agreement; and, subject to the
limitation set forth immediately preceding this clause, will reimburse, as
incurred, any legal or other expenses reasonably incurred by the Company, any
such director, officer, such Underwriter or any such controlling person in
connection with investigating or defending any such loss, claim, damage,
liability or any action in respect thereof. This indemnity agreement will be in
addition to any liability which any other Additional Selling Stockholder may
otherwise have. Each Additional Selling Stockholder will not, without the prior
written consent of the Underwriter or Underwriters purchasing, in the aggregate,
more than fifty percent (50%) of the Securities, settle or comprise or consent
to the entry of any judgment in any pending or threatened claim, action, suit or
proceeding in respect of which indemnification may be sought hereunder (whether
or not any such Underwriter or any person who controls any such Underwriter
within the meaning of Section 15 of the Act or Section 20 of the Exchange Act is
a party to such claim, action, suit or proceeding), unless such settlement,
compromise or consent includes an unconditional release of all of the
Underwriters and such controlling persons from all liability arising out of such
claim, action, suit or proceeding.

     (d) Each Underwriter will, severally and not jointly, indemnify and hold
harmless the Company, each of its directors, each of its officers who signed the
Registration Statement, each Selling Stockholder and each person, if any, who
controls the Company or such Selling Stockholder within the meaning of Section
15 of the Act or Section 20 of the Exchange Act against any losses, claims,
damages or liabilities to which the Company, any such director or officer of the
Company, such Selling Stockholder or any such controlling person of the Company
or such Selling Stockholder may become subject under the Act, the Exchange Act
or otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon (i) any untrue statement or
alleged untrue statement of any material fact contained in the Registration
Statement or any amendment thereto, any Preliminary Prospectus or the Prospectus
or any amendment or supplement thereto, or any Application, or (ii) the omission
or the alleged omission to state therein a material fact required to be stated
in the Registration Statement or any amendment thereto, any Preliminary
Prospectus or the Prospectus or any amendment or supplement thereto, or any
Application or necessary to make the statements therein not misleading, in each
case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in reliance
upon and in conformity with written information furnished to the Company by any
Underwriter through the Representatives specifically for use therein; and,
subject to the limitation set forth immediately preceding this clause, will
reimburse, as incurred, any legal or other expenses reasonably incurred by the
Company, any such director, officer or controlling person or such Selling
Stockholder in connection with investigating or defending any such loss, claim,
damage, liability or any action in respect thereof. This indemnity agreement
will be in addition to any liability which such Underwriter may otherwise have.
No Underwriter will, without the prior written consent of the Company, settle or
compromise or consent to the entry of any judgment in any pending or threatened
claim, action, suit or proceeding in respect of which indemnification may be
sought 


                                       31

   32


hereunder (whether or not the Company is a party to such claim, action,
suit or proceeding), unless such settlement, compromise or consent includes an
unconditional release of the Company from all liability arising out of such
claim, action, suit or proceeding.

     (e) Promptly after receipt by an indemnified party under this Section 8 of
notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under this
Section 8, notify the indemnifying party of the commencement thereof; but the
omission so to notify the indemnifying party will not relieve it from any
liability which it may have to any indemnified party otherwise than under this
Section 8. In case any such action is brought against any indemnified party, and
it notifies the indemnifying party of the commencement thereof, the indemnifying
party will be entitled to participate therein and, to the extent that it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense thereof, with counsel reasonably satisfactory to such indemnified
party; PROVIDED, HOWEVER, that if the defendants in any such action include both
the indemnified party and the indemnifying party and the indemnified party shall
have reasonably concluded that there may be one or more legal defenses available
to it and/or other indemnified parties which are different from or additional to
those available to the indemnifying party, the indemnifying party shall not have
the right to direct the defense of such action on behalf of such indemnified
party or parties and such indemnified party or parties shall have the right to
select separate counsel to defend such action on behalf of such indemnified
party or parties. After notice from the indemnifying party to such indemnified
party of its election so to assume the defense thereof and approval by such
indemnified party of counsel appointed to defend such action, the indemnifying
party will not be liable to such indemnified party under this Section 8 for any
legal or other expenses, other than reasonable costs of investigation,
subsequently incurred by such indemnified party in connection with the defense
thereof, unless (i) the indemnified party shall have employed separate counsel
in accordance with the proviso to the next preceding sentence (it being
understood, however, that in connection with such action the indemnifying party
shall not be liable for the expenses of more than one separate counsel (in
addition to local counsel) in any one action or separate but substantially
similar actions in the same jurisdiction arising out of the same general
allegations or circumstances, designated by the Representatives in the case of
paragraph (a) of this Section 8, representing the indemnified parties under such
paragraph (a) who are parties to such action or actions) or (ii) the
indemnifying party does not promptly retain counsel reasonably satisfactory to
the indemnified party or (iii) the indemnifying party has authorized the
employment of counsel for the indemnified party at the expense of the
indemnifying party. After such notice from the indemnifying party to such
indemnified party, the indemnifying party will not be liable for the costs and
expenses of any settlement of such action effected by such indemnified party
without the consent of the indemnifying party.

     (f) In circumstances in which the indemnity agreement provided for in the
preceding paragraphs of this Section 8 is unavailable or insufficient, for any
reason, to hold harmless an indemnified party in respect of any losses, claims,
damages or liabilities (or actions in respect thereof), each indemnifying party,
in order to provide for just and equitable contribution, shall contribute to the
amount paid or payable by such indemnified party as a result of such losses,
claims, damages or liabilities (or actions in respect thereof) in such
proportion as is appropriate to reflect (i) the relative benefits received by
the indemnifying party or parties on the one hand and 


                                       32


   33



the indemnified party on the other from the offering of the Securities or (ii)
if the allocation provided by the foregoing clause (i) is not permitted by
applicable law, not only such relative benefits but also the relative fault of
the indemnifying party or parties on the one hand and the indemnified party on
the other in connection with the statements or omissions or alleged statements
or omissions that resulted in such losses, claims, damages or liabilities (or
actions in respect thereof), as well as any other relevant equitable
considerations. The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering (after
discounts but before deducting expenses) received by the Company and the Selling
Stockholders bear to the total underwriting discounts and commissions received
by the Underwriters. The relative fault of the parties shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged omission to state a material fact
relates to information supplied by the Company, the Selling Stockholders or the
Underwriters, the parties' relative intents, knowledge, access to information
and opportunity to correct or prevent such statement or omission, and any other
equitable considerations appropriate in the circumstances. The Company, the
Selling Stockholders and the Underwriters agree that it would not be equitable
if the amount of such contribution were determined by pro rata or per capita
allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation that does not take into account
the equitable considerations referred to above in this paragraph (e).
Notwithstanding any other provision of this paragraph (e), no Underwriter shall
be obligated to make contributions hereunder that in the aggregate exceed the
total public offering price of the Securities purchased by such Underwriter
under this Agreement, less the aggregate amount of any damages that such
Underwriter has otherwise been required to pay in respect of the same or any
substantially similar claim, and no person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations to contribute hereunder are
several in proportion to their respective underwriting obligations and not
joint, and contributions among Underwriters shall be governed by the provisions
of the Prudential Securities Incorporated Master Agreement Among Underwriters.
For purposes of this paragraph (e), each person, if any, who controls an
Underwriter within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act shall have the same rights to contribution as such Underwriter, and
each director of the Company, each officer of the Company who signed the
Registration Statement and each person, if any, who controls the Company or any
Selling Stockholder within the meaning of Section 15 of the Act or Section 20 of
the Exchange Act, shall have the same rights to contribution as the Company or
such Selling Stockholder, as the case may be.

     (g) Notwithstanding anything in this Agreement to the contrary, the
liability of each Principal Selling Stockholder under this Agreement shall not
exceed the LESSER of (i) that percentage of the total amount of such losses,
claims, damages or liabilities for which the Underwriters or any persons
controlling such Underwriters are entitled to indemnity hereunder equal to the
percentage obtained by dividing the total number of Securities sold by the
Principal Selling Stockholder hereunder by the total number of Securities sold
hereunder or (ii) an amount equal to the initial public offering price of the
Securities (less underwriting discounts and commissions but not expenses) sold
by the Principal Selling Stockholder to the Underwriters.



                                       33

   34


     9. DEFAULT OF UNDERWRITERS. If one or more Underwriters default in their
obligations to purchase Firm Securities or Option Securities hereunder and the
aggregate number of such Securities that such defaulting Underwriter or
Underwriters agreed but failed to purchase is ten percent or less of the
aggregate number of Firm Securities or Option Securities to be purchased by all
of the Underwriters at such time hereunder, the other Underwriters may make
arrangements satisfactory to the Representatives for the purchase of such
Securities by other persons (who may include one or more of the non-defaulting
Underwriters, including the Representatives), but if no such arrangements are
made by the Firm Closing Date or the related Option Closing Date, as the case
may be, the other Underwriters shall be obligated severally in proportion to
their respective commitments hereunder to purchase the Firm Securities or Option
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase. If one or more Underwriters so default with respect to an aggregate
number of Securities that is more than ten percent of the aggregate number of
Firm Securities or Option Securities, as the case may be, to be purchased by all
of the Underwriters at such time hereunder, and if arrangements satisfactory to
the Representatives are not made within 36 hours after such default for the
purchase by other persons (who may include one or more of the non-defaulting
Underwriters, including the Representatives) of the Securities with respect to
which such default occurs, this Agreement will terminate without liability on
the part of any non-defaulting Underwriter or the Company other than as provided
in Section 10 hereof. In the event of any default by one or more Underwriters as
described in this Section 9, the Representatives shall have the right to
postpone the Firm Closing Date or the Option Closing Date, as the case may be,
established as provided in Section 3 hereof for not more than seven business
days in order that any necessary changes may be made in the arrangements or
documents for the purchase and delivery of the Firm Securities or Option
Securities, as the case may be. As used in this Agreement, the term
"Underwriter" includes any person substituted for an Underwriter under this
Section 9. Nothing herein shall relieve any defaulting Underwriter from
liability for its default.

     10. SURVIVAL. The respective representations, warranties, agreements,
covenants, indemnities and other statements of the Company, its officers, the
Selling Stockholders and the several Underwriters set forth in this Agreement or
made by or on behalf of them, respectively, pursuant to this Agreement shall
remain in full force and effect, regardless of (i) any investigation made by or
on behalf of the Company, any of its officers or directors, the Selling
Stockholders, any Underwriter or any controlling person referred to in Section 8
hereof and (ii) delivery of and payment for the Securities. The respective
agreements, covenants, indemnities and other statements set forth in Sections 6
and 8 hereof shall remain in full force and effect, regardless of any
termination or cancellation of this Agreement.

     11. TERMINATION. (a) This Agreement may be terminated with respect to the
Firm Securities or any Option Securities in the sole discretion of the
Representatives by notice to the Company and the Selling Stockholders given
prior to the Firm Closing Date or the related Option Closing Date, respectively,
in the event that the Company or any of the Selling Stockholders shall have
failed, refused or been unable to perform all obligations and satisfy all
conditions on their respective parts to be performed or satisfied hereunder at
or prior thereto or, if at or prior to the Firm Closing Date or such Option
Closing Date, respectively,


                                       34

   35

               (i) the Company or any of its subsidiaries shall have, in the
          sole judgment of the Representatives, sustained any material loss or
          interference with their respective businesses or properties from fire,
          flood, hurricane, accident or other calamity, whether or not covered
          by insurance, or from any labor dispute or any legal or governmental
          proceeding or there shall have been any material adverse change, or
          any development involving a prospective material adverse change
          (including without limitation a change in management or control of the
          Company), in the condition (financial or otherwise), business
          prospects, net worth or results of operations of the Company and its
          subsidiaries, except in each case as described in or contemplated by
          the Prospectus (exclusive of any amendment or supplement thereto);

               (ii) trading in the Common Stock shall have been suspended by the
          Commission or the New York Stock Exchange or the Nasdaq National
          Market;

               (iii) trading in securities generally on the New York Stock
          Exchange or Nasdaq National Market shall have been suspended or
          minimum or maximum prices shall have been established on either such
          exchange or market system; or a banking moratorium shall have been
          declared by New York or United States authorities; or

               (iv) there shall have been (A) an outbreak or escalation of
          hostilities between the United States and any foreign power, (B) an
          outbreak or escalation of any other insurrection or armed conflict
          involving the United States or (C) any other calamity or crisis or
          material adverse change in general economic, political or financial
          conditions having an effect on the U.S. financial markets that, in the
          sole judgment of the Representatives, makes it impractical or
          inadvisable to proceed with the public offering or the delivery of the
          Securities as contemplated by the Registration Statement, as amended
          as of the date hereof.

          (b) Termination of this Agreement pursuant to this Section 11 shall be
without liability of any party to any other party except as provided in Section
10 hereof.

          12. INFORMATION SUPPLIED BY UNDERWRITERS. The statements set forth in
the last paragraph on the front cover page and under the heading "Underwriting"
in any Preliminary Prospectus or the Prospectus (to the extent such statements
relate to the Underwriters) constitute the only information furnished by any
Underwriter through the Representatives to the Company or any Selling
Stockholder for the purposes of Sections 2(A)(b) and 8 hereof. The Underwriters
confirm that such statements (to such extent) are correct.

          13. DEFAULT BY SELLING STOCKHOLDERS. If on the Firm Closing Date or
the Option Closing Date any Selling Stockholder fails to sell the Firm
Securities or Option Securities which such Selling Stockholder has agreed to
sell on such date as set forth in SCHEDULE III hereto or Section 3(b) hereof,
the Company agrees that it will sell or arrange for the sale of at least 10% of
that number of shares of Common Stock to the Underwriters which represents Firm
Securities or Option Securities which such Selling Stockholder has failed to so
sell, as set forth in SCHEDULE III 


                                       35

   36


hereto or Section 3(b) hereof, or such lesser number as may be requested by the
Representatives.

          14. NOTICES. All communications hereunder shall be in writing and, if
sent to any of the Underwriters, shall be delivered or sent by mail, telex or
facsimile transmission and confirmed in writing to Prudential Securities
Incorporated, One New York Plaza, New York, New York 10292, Attention: Equity
Transactions Group (telecopier: (212) 778-3621) with a copy to Testa, Hurwitz &
Thibeault, LLP, High Street Tower, 125 High Street, Boston, MA 02110, Attention:
Timothy C. Maguire, Esq. (telecopier: (617) 248-7100); if sent to the Company,
shall be delivered or sent by mail, telex or facsimile transmission and
confirmed in writing to the Company at 199 Riverneck Road, Chelmsford, MA 01824,
Attention: James R. Bertelli, President (telecopier: (978) 256-0013) with a copy
to Hutchins, Wheeler & Dittmar, A Professional Corporation, 101 Federal Street,
Boston, MA 02110, Attention: Anthony J. Medaglia, Jr., Esq. (telecopier: (617)
951-1295); and if sent to any Selling Stockholder, shall be delivered or sent by
mail at its address on the register of the Company.

          15. SUCCESSORS. This Agreement shall inure to the benefit of and shall
be binding upon the several Underwriters, the Company and the Selling
Stockholders and their respective successors and legal representatives, and
nothing expressed or mentioned in this Agreement is intended or shall be
construed to give any other person any legal or equitable right, remedy or claim
under or in respect of this Agreement, or any provisions herein contained, this
Agreement and all conditions and provisions hereof being intended to be and
being for the sole and exclusive benefit of such persons and for the benefit of
no other person except that (i) the indemnities of the Company and the Selling
Stockholders contained in Section 8 of this Agreement shall also be for the
benefit of any person or persons who control any Underwriter within the meaning
of Section 15 of the Act or Section 20 of the Exchange Act and (ii) the
indemnities of the Underwriters contained in Section 8 of this Agreement shall
also be for the benefit of the directors of the Company, the officers of the
Company who have signed the Registration Statement and any person or persons who
control the Company within the meaning of Section 15 of the Act or Section 20 of
the Exchange Act and the Selling Stockholders. No purchaser of Securities from
any Underwriter shall be deemed a successor because of such purchase.

          16. APPLICABLE LAW. The validity and interpretation of this Agreement,
and the terms and conditions set forth herein, shall be governed by and
construed in accordance with the laws of the State of New York, without giving
effect to any provisions relating to conflicts of laws.

          17. CONSENT TO JURISDICTION AND SERVICE OF PROCESS. All judicial
proceedings arising out of or relating to this Agreement may be brought in any
state or federal court of competent jurisdiction in the State of New York, and
by execution and delivery of this Agreement, the Selling Stockholders accepts
for itself and in connection with its properties, generally and unconditionally,
the nonexclusive jurisdiction of the aforesaid courts and waives any defense of
forum non conveniens and irrevocably agrees to be bound by any judgment rendered
thereby in connection with this Agreement.

          18. COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.


                                       36
   37








                  [REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]











                                       37

   38


          If the foregoing correctly sets forth our understanding, please
indicate your acceptance thereof in the space provided below for that purpose,
whereupon this letter shall constitute an agreement binding the Company, the
Selling Stockholders and each of the several Underwriters.


                             Very truly yours,


                             MERCURY COMPUTER SYSTEMS, INC.


                             By:_____________________________________
                                Name:
                                Title:


                             MD CO.
                             MASSACHUSETTS MUTUAL LIFE 
                               INSURANCE COMPANY
                             MASSMUTUAL CORPORATE INVESTORS
                             DATA GENERAL CORPORATION
                             FIRST STAGE CAPITAL LIMITED 
                               PARTNERSHIP
                             ROBERT FRISCH
                             JOHN NITZSCHE
                             KATHRYN BERTELLI
                             KATHRYN BERTELLI 1995 IRREVOCABLE 
                               TRUST, KATHRYN BERTELLI TRUSTEE
                             KATHRYN BERTELLI, AS CUSTODIAN FOR 
                               HEIDI BERTELLI
                             SUSAN L. ANSIN
                             LAWRENCE J. ANSIN 1990 REVOCABLE 
                               TRUST -- TRUST A-2, PATRICK B. 
                               MARAGHY, TRUSTEE
                             GREGORY DAVID ANSIN 1992 REVOCABLE
                               TRUST, PATRICK B. 
                               MARAGHY, TRUSTEE
                             LISA ANSIN 1988 REVOCABLE TRUST,
                               PATRICK B. MARAGHY, TRUSTEE
                             BRUCE BECK
                             DAVID BERTELLI
                             PAUL BERTELLI
                             MARY CACCIATORE
                             DIMENSION ENTERPRISES
                             JOHN FREEBURN, JR.
                             BARRY ISENSTEIN
                             SCOTT ISRAEL



                                       38

   39



                             CRAIG LUND
                             CRAIG MAXEY
                             STEPHEN PATTERSON
                             ARLAN POOL
                             DENNIS RAKOCY
                             GRAHAM SMITH
                             MARIAN SONNENFELD
                             SEYMOUR STEIN
                             MARK TURNER
                             JAMES WESTRA





                             By:____________________________________
                                as Attorney-in-Fact, acting on behalf of each of
                                the above-named Selling Stockholders







                                       39
   40



The foregoing Agreement is hereby 
confirmed and accepted as of the 
date first above written.

PRUDENTIAL SECURITIES INCORPORATED
COWEN & COMPANY

By:  PRUDENTIAL SECURITIES INCORPORATED


By:___________________________________________
   Jean-Claude Canfin
   Managing Director

For itself and on behalf of the Representatives.



                                       40



   41


                                   SCHEDULE I

                         PRINCIPAL SELLING STOCKHOLDERS



                                         (a)                   (b)
                                      Number of             Number of
                                   Firm Securities      Option Securities
                                    to be sold to         to be sold to
                                     Underwriters         Underwriters
                                     ------------         ------------

MD Co.
First Stage Capital
  Limited Partnership

                              Totals   _________            __________



   42


                                   SCHEDULE II

                         ADDITIONAL SELLING STOCKHOLDERS



                                           (a)                      (b)
                                     Number of Firm          Number of Option
                                    Securities to be         Securities to be
                                  Sold to Underwriters     Sold to Underwriters
                                  --------------------     --------------------
Massachusetts Mutual Life 
   Insurance Company
MassMutual Corporate 
   Investors
Data General Corporation
Robert Frisch
John Nitzsche
Kathryn Bertelli
Kathryn Bertelli 1995 
   Irrevocable Trust, Kathryn 
   Bertelli Trustee
Kathryn Bertelli, As Custodian 
   For Heidi Bertelli
Susan L. Ansin
Lawrence J. Ansin 1990 
   Revocable Trust -- Trust 
   A-2, Patrick B. Maraghy, 
   Trustee
Gregory David Ansin 1992 
   Revocable Trust, 
   Patrick B. Maraghy,
   Trustee
Lisa Ansin 1988 Revocable 
   Trust, Patrick B. Maraghy, 
   Trustee
Bruce Beck
David Bertelli
Paul Bertelli
Mary Cacciatore
Dimension Enterprises
John Freeburn, Jr.
Barry Isenstein
Scott Israel
Craig Lund
Craig Maxey
Stephen Patterson


   43




Arlan Pool
Dennis Rakocy
Graham Smith
Marian Sonnenfeld
Seymour Stein
Mark Turner
James Westra
                         Totals        _________                 __________



   44


                                  SCHEDULE III

                                  UNDERWRITERS




                                (a)                   (b)                     (c)                  (d)
                                                                                                Number of
                                                 Number of Firm                                  Option
                           Number of Firm       Securities to be      Number of Option        Securities to
                          Securities to be      Purchased from        Securities to be         be Purchased
                           Purchased From        the Selling          Purchased From The         from The
Underwriter                 the Company          Stockholders        Selling Stockholders         Company
- -----------               ----------------      ----------------     --------------------     -------------
                                                                                  

Prudential 
Securities
Incorporated....
Cowen & 
Company......
[insert names of
other Underwriters

alphabetically by
bracket or in
 other order
determined by
 Prudential
Securities
Incorporated -
 Equity 
Transactions
Group]

Total                         2,000,000             1,500,000              295,350                 229,650
                              ---------             ---------              -------                 -------




   45


                                   SCHEDULE IV

                                  SUBSIDIARIES


Name                                              Jurisdiction of Organization
- ----                                              ----------------------------

Mercury Computer Securities Corporation           Massachusetts
Riverneck Road LLC                                Massachusetts
Mercury Computer International Sales Corp.        Delaware
Mercury Computer Systems B.V.                     The Netherlands
Nihon Mercury Computer Systems K.K.               Japan
Mercury Computer Systems S.A.R.L.                 France
Mercury Systems Ltd.                              United Kingdom
Mercury Computer Systems Export, Inc.             Barbados