EXHIBIT 10(d)

                RESTATED AND AMENDED NOTE PURCHASE AGREEMENT
                           BETWEEN THE COMPANY AND
                           AETHERWORKS CORPORATION
                             DATED JUNE 19, 1996  



                           AETHERWORKS CORPORATION

                             RESTATED AND AMENDED  
                           NOTE PURCHASE AGREEMENT 

     THIS RESTATED AND AMENDED AGREEMENT is made and entered into as of June 
19, 1996, by and between AetherWorks Corporation, a  Minnesota corporation 
(the "Company"), and Digi International Inc., a Delaware corporation 
("Digi"), sometimes referred to individually as a "Party" and collectively as 
the "Parties."

                                 R E C I T A L S

     As of October 10, 1995, the Company and Digi executed a Note Purchase 
Agreement (the "1995 Note Purchase Agreement"), pursuant to which Digi 
purchased, and the Company issued, a convertible secured promissory note, 
dated October 10, 1995, in the original principal amount of $3,353,235 (the 
"1995 Convertible Note").  Digi also committed in the 1995 Note Purchase 
Agreement to purchase an additional convertible secured promissory note in 
the original principal amount of $1,433,290.

     Digi has held two seats on the Company's Board of Directors (the "Board 
of Directors" or the "Board") since October 10, 1995, and has participated in 
the decisions of the Board, including the election of the fifth member of the 
Board, the appointment of senior management of the Company, and Board-level 
decisions regarding the development of the ARMs  and Jeeves, and the decision 
to acquire and develop V.Mach Technology (as hereinafter defined), which was 
not contemplated at the time of execution of the 1995 Note Purchase Agreement.

     Digi has expressed interest in purchasing, and the Company desires to 
have Digi purchase, in part for the development and commercial exploitation 
of V.Mach Technology, convertible promissory notes of the Company, in the 
aggregate principal amount of $9,000,000, in addition to one for $1,433,290 
originally to be issued pursuant to the 1995 Note Purchase Agreement and the 
1995 Convertible Note previously issued pursuant to the 1995 Note Purchase 
Agreement.  

     In light of the mutual commercial opportunity presented by the V.Mach 
Technology, in recognition of the greater familiarity and closer relationship 
of the Parties and in order to provide for the additional development 
contemplated by the Parties, the Parties desire to amend and restate in its 
entirety the 1995 Note Purchase Agreement, most particularly to eliminate 
milestones set forth in the 1995 Note Purchase Agreement and the rights and 
obligations of the Parties in connection with such milestones, and to 
delineate the Parties' respective rights and obligations with respect to the 
V.Mach Technology.  

                                A G R E E M E N T

     NOW, THEREFORE, in consideration of the foregoing premises and the 
Parties' respective rights and obligations set forth in this Agreement, the 
Company and Digi hereby agree as follows:

     1.   AMENDMENT TO 1995 NOTE PURCHASE AGREEMENT AND COROLLARY DOCUMENTS. 
The 1995 Note Purchase Agreement shall be, and hereby is, amended and 
restated in its entirety by this Agreement.  The 1995 Convertible Note shall 
be restated and amended in the form attached to this Agreement as Exhibit 1 
upon execution of such form (and, as restated and amended, shall for purposes 
of this Agreement hereinafter be referred to as the "Amended 1995 Note").  
Each of the Security Agreement, Manufacturing Agreement and Shareholder 
Voting Agreement issued pursuant to the 1995 Note Purchase Agreement shall 



be amended and restated in its entirety in the forms attached to this 
Agreement as Exhibits 3, 4 and 5, respectively, upon execution of such forms 
(and, as restated and amended in their entirety, shall, for purposes of this 
Agreement, hereinafter be referred to as the "Security Agreement," 
"Manufacturing Agreement" and "Shareholder Voting Agreement," respectively).  
Each of this Agreement, the Amended 1995 Note, the Notes to be issued under 
this Agreement, the Security Agreement, the Manufacturing Agreement, the 
Technology Transfer Agreement and the Shareholder Voting Agreement may be 
referred to individually a "Transaction Document" and collectively, as the 
"Transaction Documents".  The Parties expressly intend that the 
representations, warranties and agreements of the Principal Shareholder 
(Jonathan A. Henrikssen Sachs, Ph.D.) set forth in the Note Purchase 
Agreement dated October 9, 1995 shall expire upon execution of this 
Agreement.  

     2.   SALE AND PURCHASE OF CONVERTIBLE NOTES.  Subject to the terms and 
conditions hereof, the Company agrees to issue and to sell to Digi, and Digi 
agrees to purchase from the Company, the convertible notes described in this 
Section 2 (each a "Note" and together, the "Notes"). The term "Notes" as used 
herein shall mean the (a) convertible notes issued pursuant to this 
Agreement, (b) where such term is used to refer to an issued Note, the 
Amended 1995 Note and (c) all notes of the Company issued in exchange or 
substitution for the foregoing.

          2.1  PRINCIPAL AMOUNT OF NOTES AND TIMING OF PURCHASES.  The Notes 
to be purchased by Digi subsequent to the date of this Agreement shall be in 
the amounts set forth below and shall, subject to satisfaction of the 
conditions set forth in Section 3 and elsewhere in this Agreement, be 
purchased according to the following schedule:

          (a)  Upon the execution of this Agreement, a Note of the Company,
     dated June 19, 1996, in the principal amount of $1,433,290; and

          (b)  Within ten business days of the Company's written request, in one
     or more additional Notes as and when requested by the Company, whose
     principal amounts shall be in lawful money of the United States and in
     integral increments of $1,000,000, provided that the aggregate principal
     amount of such Notes to the exclusion of the 1995 Convertible Note and the
     Note in 2.1(a) above,  shall not exceed $9,000,000.

          2.2  TERMS OF EACH NOTE.  Each Note shall be in substantially the 
form set forth in Exhibit 2 to this Agreement (the "Form of Note").  The 
Notes shall be convertible into shares of the Company's Common Stock, par 
value $.01 per share (the "Common Stock"), in accordance with the terms set 
forth in the Form of Note, provided that conversion of any of the Notes 
issued pursuant to this Agreement shall not release Digi from its obligation 
to purchase additional Notes pursuant to this Section 2.  The shares of 
Common Stock into which the Notes are convertible and all shares of Common 
Stock of the Company issued in exchange or substitution therefor are 
hereinafter sometimes referred to as the "Conversion Stock."  Each Note shall 
be secured by a lien on those assets identified in, and in accordance with 
the terms of the Security Agreement. Each Note shall be due and payable on 
December 31, 1998.  Interest on each Note shall accrue at the rate set forth 
in the Form of Note and shall be due and payable on the earlier of December 
31, 1998 or from the proceeds of the Company's Initial Public Offering (as 
defined below) as provided in the Form of Note.  AetherWorks shall have the 
option, upon written notice sixty (60) days prior to such date as interest 
becomes due and payable, to convert interest accrued on the Notes into either 
(a) Common Stock of the Company at the same rate and upon the same terms as 
the principal amount of the Notes issued on a Subsequent Closing as that term 
is defined in Section 3 or issued according to Section 2.1(b), or (b) 
principal evidenced by a new note bearing interest at the same rate, with 
principal and interest payable on mutually acceptable terms.  

          For all purposes under this Agreement, the term "Initial Public
Offering" shall mean the 

                                     -2- 


closing of the first public offering of the Company of shares of Common Stock 
of the Company registered under the Securities Act in which (1) the aggregate 
public offering price of the securities sold for cash by the Company in the 
offering is at least $20,000,000, and (2) the offering is underwritten on a 
firm commitment basis by an underwriter, or a group of underwriters presented 
by an underwriter or underwriters, which is a member of the New York Stock 
Exchange.  For this purpose, the term "closing" shall mean the delivery by 
the Company to the underwriters of certificates representing the shares of 
Common Stock offered to the public against delivery to the Company by the 
underwriters of payment therefor, and the term "firm commitment basis" with 
respect to the underwriting of such public offering shall mean a commitment 
pursuant to a written underwriting agreement under which the nature of the 
underwriters' commitment is such that all securities will be purchased by 
such underwriters if any securities are purchased by such underwriters.

     3.   CLOSING.  The closing of the sale to, and purchase by Digi, of the 
Notes to be purchased pursuant to Section 2.1(a) of this Agreement (the 
"Initial Closing") shall occur at the offices of Digi International at 1:00 
p.m. on June 19, 1996, or on such other day or at such other time or place as 
Digi and the Company shall agree upon (the "Initial Closing Date").  The 
closing of the sale of each Note to be purchased pursuant to the provisions 
of Section 2.1(b) subsequently by Digi (each a "Subsequent Closing") shall 
occur within ten business days of the Company's request therefor at such time 
and place as Digi and the Company shall agree upon (each a "Subsequent 
Closing Date").  The term "Closing" as used herein shall mean, as applicable, 
the Initial Closing or any Subsequent Closing.  The term "Closing Date" as 
used herein shall mean, as applicable, the Initial Closing Date or any 
Subsequent Closing Date.  At the Initial Closing, the Company will deliver to 
Digi the Note to be purchased at such closing in the original principal 
amount of $1,433,290, dated June 19, 1996, and Digi shall deliver Digi's 
certified or bank cashier's check drawn on Norwest Bank Minnesota, National 
Association, in the principal amount of $1,433,290. At each Subsequent 
Closing, the Company will deliver to Digi the Note to be purchased by Digi at 
such Closing against delivery to the Company of Digi's certified or bank 
cashier's check drawn on Norwest Bank Minnesota, National Association, in the 
principal amount of such Note, in payment of the total purchase price of such 
Note.

     4.   CONDITIONS TO THE PURCHASE OF EACH NOTE.  The obligation to 
purchase and pay for each Note which Digi has agreed to purchase on the 
Initial Closing Date is subject to the fulfillment prior to or on such 
Initial Closing Date of the conditions set forth in Section 4.1 through 4.11, 
inclusive.  The obligation to purchase and pay for each Note which Digi has 
agreed to purchase on a Subsequent Closing Date is subject to the fulfillment 
prior to or on such Subsequent Closing Date of the conditions set forth in 
Sections 4.1 through 4.4, inclusive, and Sections 4.6 and 4.11.

          4.1  NO ERRORS, ETC.  The representations and warranties of Section 
6 of this Agreement shall be true in all material respects as of each Closing 
Date.

          4.2  COMPLIANCE WITH AGREEMENT.  The Company shall have performed 
and complied with all material agreements or conditions required by this 
Agreement to be performed and complied with by it prior to or as of each 
Closing Date, the nonperformance or noncompliance with which would have a 
material adverse effect on the operation of the Company's business.

          4.3  NO EVENT OF DEFAULT.  There shall exist at the time of each 
Closing, no condition or event which would constitute an Event of Default of 
the Company (as defined in Section 11) or which, after notice or lapse of 
time or both, would constitute an Event of Default of the Company.

          4.4  CERTIFICATE OF OFFICERS.  The Company shall have delivered to 
Digi a certificate, dated the Initial Closing Date or the Subsequent Closing 
Date, as the case may be, executed by the Chief Executive Officer and the 
senior financial officer of the Company and certifying to the satisfaction of 
the 

                                     -3- 


conditions specified in Sections 4.1, 4.2 and 4.3 hereof.  

          4.5  OPINION OF COUNSEL.  The Company shall have delivered to Digi 
an opinion or opinions of Briggs and Morgan, P.A., counsel for the Company in 
form acceptable to counsel for Digi, dated June 20, 1996.

          4.6  QUALIFICATION UNDER STATE SECURITIES LAWS.  All registrations, 
qualifications, permits and approvals required under applicable state 
securities laws for the lawful execution and delivery of this Agreement and 
the offer, sale, issuance and delivery of the Notes and the offer of the 
Conversion Stock shall have been obtained.

          4.7  SECURITY AGREEMENT.  Digi and the Company shall have executed 
the Security Agreement covering all of the Company's inventory, equipment, 
accounts arising from licenses and other transfers of V.Mach Wireline 
Technology (as defined in the Technology Transfer Agreement), and general 
intangibles arising from such technology, in substantially the form of 
Exhibit 3 hereto.

          4.8  MANUFACTURING AGREEMENT.  Digi and the Company shall have 
executed the Manufacturing Agreement, in substantially the form of Exhibit 4 
hereto.

          4.9  SHAREHOLDER VOTING AGREEMENT.  Digi, and each of William H. 
Costigan, Robert C. Lind, Ph.D., Jonathan A. Henrikssen Sachs, Ph.D., each a 
shareholder of the Company, shall have entered into the Shareholder Voting 
Agreement in substantially the form of Exhibit 5 hereto.

          4.10  V.MACH TECHNOLOGY TRANSFER AGREEMENT.  Digi and the Company 
shall have entered into a Technology Transfer Agreement (the "Technology 
Transfer Agreement") governing the technology known to the Parties as V.Mach, 
which agreement shall be in substantially the form of Exhibit 6 hereto.

          4.11  BUSINESS PLAN.  Prior to the Initial Closing Date, management 
of the Company shall have caused to be prepared product development schedules 
for each of the Company's Arm, Jeeves, and V.Mach products and services.  
Prior to the next Subsequent Closing Date, management of the Company shall 
have caused to be prepared and the Company's Board of Directors shall have 
approved, the business plan contemplated by Section 7.4 of this Agreement.  

          5.   REPRESENTATIONS AND WARRANTIES BY COMPANY.  Except as 
disclosed in the disclosure schedule attached as Schedule A (the "Disclosure 
Schedule"), and subject to the provisions of Section 13 hereof, the Company 
represents and warrants to Digi that:

          5.1  ORGANIZATION, STANDING, ETC. The Company is a corporation duly 
organized, validly existing and in good standing under the laws of the State 
of Minnesota, and has the requisite corporate power and authority to own its 
properties and to carry on its business in all material respects as it is now 
being conducted.  The Company has the requisite corporate power and authority 
to issue the Notes and the Conversion Stock, and to otherwise perform its 
obligations under this Agreement and the Notes.  The copies of the Articles 
of Incorporation and Bylaws of the Company delivered to Digi or their agents 
prior to the execution of this Agreement are true and complete copies of the 
duly and legally adopted Articles of Incorporation and Bylaws of the Company 
in effect as of the date of this Agreement.  As of the date of this 
Agreement, the Company does not have any direct or indirect equity interest 
in any other firm, corporation, partnership, joint venture association or 
other business organization.

          5.2  QUALIFICATION.  To the best of its knowledge, the Company is 
duly qualified or licensed as a foreign corporation in good standing in each 
jurisdiction wherein the nature of its activities or 

                                     -4- 


of its properties owned or leased makes such qualification or licensing 
necessary and failure to be so qualified or licensed would have a material 
adverse impact on its business.

          5.3  FINANCIAL STATEMENTS.  Attached hereto as Schedule B is an 
unaudited balance sheet dated April 30, 1996 (the "Balance Sheet Date"), 
together with the related unaudited statements of operations, shareholders' 
equity and cash flow for the fiscal period then ended (such financial 
statements hereinafter referred to as the "Financial Statements").  Such 
Financial Statements (i) are in accordance with the books and records of the 
Company, (ii) present fairly the financial condition of the Company at the 
Balance Sheet Date and the results of its operations for the period therein 
specified, and (iii) have, in all material respects, been prepared in 
accordance with generally accepted accounting principles applied on a basis 
consistent with prior accounting periods; provided, however, that the 
unaudited financial statements omit the footnotes required under generally 
accepted accounting principles, including the description of business, 
summary of accounting policies, notes payable, income taxes, employment 
agreements, stock options and warrants, proposed issuance of convertible 
notes, and other necessary disclosures arising from this Agreement and the 
Notes, and do not reflect the leases, the payments on which might be 
capitalized under generally accepted accounting principles. Specifically, but 
not by way of limitation, to the Company's best knowledge and belief, the 
unaudited financial statements disclose all of the debts, liabilities and 
obligations of any nature (whether absolute or accrued) of the Company at the 
Balance Sheet Date which, individually or in the aggregate, are material and 
which in accordance with generally accepted accounting principles would be 
required to be disclosed in such unaudited financial statements, and the 
omission of which would, in the aggregate, have a material adverse impact on 
the Company.  The unaudited balance sheet includes appropriate reserves for 
all taxes incurred through such Balance Sheet date.

          5.4  TAX RETURNS AND AUDITS.  To the best of the Company's 
knowledge, all required federal, state and local tax returns or appropriate 
extension requests of the Company have been filed, and all federal, state and 
local taxes required to be paid with respect to such returns have been paid 
or due provision for the payment thereof has been made. To the best of the 
Company's knowledge, the Company is not delinquent in the payment of any such 
tax or in the payment of any assessment or governmental charge.  The Company 
has not received notice of any tax deficiency proposed or assessed against 
it, and has not executed any waiver of any statute of limitations on the 
assessment or collection of any tax. None of the Company's tax returns has 
been audited by governmental authorities in a manner to bring such audits to 
the Company's attention. To the best of the Company's knowledge, the Company 
does not have any tax liabilities except those reflected in the Financial 
Statements hereto and those incurred in the ordinary course of business since 
the Balance Sheet Date.

          5.5  CHANGES, DIVIDENDS, ETC.  Except for the transactions 
contemplated by this Agreement or transactions disclosed to the Company's 
Board of Directors prior to the date of this Agreement, since the Balance 
Sheet Date, the Company has not:  (a) incurred any debts, obligations or 
liabilities, absolute, accrued or contingent, except current liabilities 
incurred in the ordinary course of business, which (individually or in the 
aggregate) will not materially and adversely affect the business, properties 
or prospects of the Company; (b) paid any obligation or liability other than, 
or discharged or satisfied any liens or encumbrances other than those 
securing current liabilities, in each case in the ordinary course of 
business; (c) mortgaged, pledged or subjected to lien, charge, security 
interest or other encumbrance any of its assets, tangible or intangible, 
except in the ordinary course of business; (d) sold, transferred or leased 
any of its assets except in the ordinary course of business; (e) canceled or 
compromised any debt or claim, or waived or released any right of material 
value; (f) suffered any physical damage, destruction or loss (whether or not 
covered by insurance) materially and adversely affecting the properties, 
business or prospects of the Company; (g) entered into any transaction other 
than in the ordinary course of business; (h) encountered any labor 
difficulties or labor union organizing activities; (i) increased the 
compensation payable, or to become payable, to any of its directors or 
employees, or made 

                                     -5- 


any bonus payment or similar arrangement with any directors or employees or 
increased the scope or nature of any fringe benefits provided for its 
employees or directors; or (j) agreed to do any of the foregoing other than 
pursuant hereto. Except as disclosed to the Company's Board of Directors 
there has been no material adverse change in the financial condition, 
operations, results of operations or business of the Company since the 
Balance Sheet Date.  For all purposes under this Agreement, "disclosed to the 
Company's Board of Directors" shall mean discussed in a duly convened Board 
meeting or reflected in written actions of the Board in lieu thereof.

          5.6  TITLE TO PROPERTIES AND ENCUMBRANCES.  To the best of its 
knowledge and belief, the Company has good and marketable title to all its 
owned properties and assets, including without limitation the properties and 
assets reflected in the Financial Statements and the properties and assets 
used in the conduct of its business, except for property leased by or 
disposed of in the ordinary course of business since the Balance Sheet Date, 
which properties and assets are not subject to any mortgage, pledge, lease, 
lien, charge, security interest, encumbrance or restriction, except (a) those 
incurred in the ordinary course of the Company's business, (b) which are 
shown and described in the Financial Statements or the notes thereto, or (c) 
Permitted Liens (as hereinafter defined).  The offices and equipment owned 
and leased by the Company have been kept in good condition and repair in the 
ordinary course of business, and the Company has not been threatened with any 
action or proceeding under any building or zoning ordinance, law or 
regulation.  For the purposes of this Agreement, "Permitted Liens" shall mean 
(a) liens for taxes and assessments or governmental charges or levies not at 
the time due or in respect of which the validity thereof shall currently be 
contested in good faith by appropriate proceedings; (b) liens in respect of 
pledges or deposits under worker's compensation laws or similar legislation, 
carriers', warehousepersons', mechanics', laborers' and materialpersons', 
landlords' and statutory and similar liens, if the obligations secured by 
such liens are not then delinquent or are being contested in good faith; (c) 
liens and encumbrances incidental to the conduct of the business of the 
Company which were not incurred in connection with the borrowing of money or 
the obtaining of advances or credits and which do not in the aggregate 
materially detract from the value of its property or materially impair the 
use thereof in the operation of its business; and (d) Permitted Encumbrances 
(as defined in the Security Agreement).

          5.7  LITIGATION; GOVERNMENTAL PROCEEDINGS.  There are no legal 
actions, suits, arbitration or other legal, administrative or governmental 
proceedings or investigations pending or, to the knowledge of the Company, 
threatened against the Company, its properties, assets or business, and 
except as previously disclosed to Digi, the Company is not aware of any facts 
which are likely to result in or form the basis for any such action, suit or 
other proceeding.  The Company is not in default with respect to any 
judgment, order or decree of any court or any governmental agency or 
instrumentality.  The Company has not been threatened with any action or 
proceeding under any business or zoning ordinance, law or regulation.

          5.8  COMPLIANCE WITH APPLICABLE LAWS AND OTHER INSTRUMENTS.  To the 
best of the Company's knowledge:  The business and operations of the Company 
have been and are being conducted in accordance with all applicable laws, 
rules and regulations of all governmental authorities; neither the execution 
nor delivery of, nor the performance of or compliance with the Transaction 
Documents nor the consummation of the transactions contemplated hereby or 
thereby will conflict with, or, with or without the giving of notice or 
passage of time, result in any breach of, or constitute a default under, or 
result in the imposition of any lien or encumbrance upon any asset or 
property of the Company pursuant to, any applicable law, administrative 
regulation or judgment, order or decree of any court or governmental body, 
any agreement or other instrument to which the Company is a party or by which 
it or any of its properties, assets or rights is bound or affected, and will 
not violate the Articles of Incorporation or Bylaws of the Company; the 
Company is not in violation of its Articles of Incorporation or its Bylaws 
nor in violation of, or in default under, any lien, indenture, mortgage, 
lease, agreement, instrument, commitment or arrangement in any material 
respect other than as otherwise disclosed herein.

                                     -6- 


          5.9  CONVERSION STOCK.  The Conversion Stock has been reserved for 
issuance, and when issued upon conversion will be duly authorized, validly 
issued and outstanding, fully paid, nonassessable and free and clear of all 
pledges, liens, encumbrances and restrictions.  The certificates representing 
the Conversion Stock to be delivered upon the conversion of the Notes will be 
genuine, and the Company has no knowledge of any fact which would impair the 
validity thereof.

          5.10 SECURITIES LAWS.  Based in part upon the representations and 
warranties contained in Section 6 hereof and the advice of the Company's 
counsel, no consent, authorization, approval, permit or order of or filing 
with any governmental or regulatory authority is required under current laws 
and regulations in connection with the execution and delivery of the 
Transaction Documents or the offer, issuance, sale or delivery of the Notes 
or the offer of the Conversion Stock other than the qualification thereof, if 
required, under applicable state securities laws, which qualification has 
been or will be effected as a condition of these sales.  The Company has not, 
directly or through an agent, offered the Notes or the Conversion Stock, or 
any similar securities for sale to, or solicited any offers to acquire such 
securities from, persons other than Digi.  Based on the advice of the 
Company's counsel, under the circumstances contemplated hereby, the offer, 
issuance, sale and delivery of the Notes and the offer of the Conversion 
Stock will not under current laws and regulations require compliance with the 
prospectus delivery or registration requirements of the Securities Act.

          5.11 PATENTS AND OTHER INTANGIBLE RIGHTS.  To the best of the 
Company's knowledge, the Company (a) owns or has the right to use, free and 
clear of all material liens, claims and restrictions, except in favor of 
Digi, all patents, trademarks, service marks, trade names, copyrights, 
licenses and rights with respect to the foregoing, used in the conduct of its 
business as now conducted or proposed to be conducted, (b) is not obligated 
or under any liability requiring but not having received the approval of the 
Company's Board of Directors to make any payments of a material nature by way 
of royalties, fees or otherwise to any owner of, licensor of, or other 
claimant to, any patent, trademark, trade name, copyright or other intangible 
asset, with respect to the use thereof or in connection with the current 
conduct of its business or otherwise, (c) owns or has sufficient rights to 
use all trade secrets, including know-how, inventions, designs, processes, 
computer programs and technical data necessary to the development, operation 
and sale of all products and services sold or proposed to be sold by it and 
(d) the Company is not, to the best of its knowledge, nor has it received 
notice with respect to, infringing upon or otherwise acting adversely to any 
known right or claimed right of any person under or with respect to any 
patents, trademarks, service marks, trade names, copyrights, licenses or 
rights with respect to the foregoing.

          5.12 CAPITAL STOCK.  The authorized capital stock of the Company 
consists of 10,000,000 common shares, of which 1,126,700 shares are issued 
and outstanding; all of these shares were duly authorized, validly issued and 
are fully paid and nonassessable.  In addition, there are outstanding 
warrants to purchase 39,166 common shares, additional options and warrants 
may be issued to purchase up to 10,000 common shares pursuant to a Private 
Placement Memorandum previously authorized by the Company's Board of 
Directors, and options have been and will be granted to one of the members of 
the Company's Board of Directors. Other than the foregoing and the Amended 
1995 Note, there are no outstanding subscriptions, options, warrants, calls, 
contracts, demands, commitments, or other securities which are at any time 
directly or indirectly convertible or exchangeable for shares of common stock 
of the Company (collectively, "Convertible Securities") or other agreements 
or arrangements of any character or nature whatever, except as otherwise 
disclosed in the Disclosure Schedule or as contemplated by this Agreement, 
under which the Company is or may be obligated to issue capital stock or 
other securities of any kind representing an ownership interest or contingent 
ownership interest in the Company.  Except for the foregoing, neither the 
offer nor the issuance or sale of the Notes or the Conversion Stock 
constitutes an event, under any anti-dilution provisions of any securities 
issued or issuable by the Company or any agreements with respect to the 
issuance of securities by the Company, which will either increase the 

                                     -7- 


number of shares issuable pursuant to such provisions or decrease the 
consideration per share to be received by the Company pursuant to such 
provisions.  No holder of any security of the Company is entitled to any 
preemptive or similar rights to purchase securities from the Company except 
as otherwise contemplated by this Agreement, provided, however, that nothing 
in this Section 5.12 shall affect, alter or diminish any right granted to 
Digi in this Agreement.  To the best of the Company's knowledge, all 
outstanding securities of the Company have been issued in full compliance 
with an exemption or exemptions from the registration and prospectus delivery 
requirements of the Securities Act and from the registration and 
qualification requirements of all applicable state securities laws.

          5.13 OUTSTANDING DEBT.  The Company has no indebtedness for 
borrowed money except as otherwise set forth in Schedule B.  Except as 
otherwise disclosed in the Disclosure Schedules, the Company is not in 
default in the payment of the principal of or interest or premium on any such 
indebtedness for borrowed money, and no event has occurred or is continuing 
under the provisions of any instrument, document or agreement evidencing or 
relating to any such indebtedness for borrowed money which with the lapse of 
time or the giving of notice, or both, would constitute an event of default 
thereunder.  As used herein, the phrase "indebtedness for borrowed money" 
shall include only indebtedness of the Company incurred as the result of a 
direct borrowing of money and shall not include any other indebtedness, 
including indebtedness with respect to trade accounts.

          5.14 MATERIAL CONTRACTS.  The Company has disclosed to its Board of 
Directors prior to the date of this Agreement each material contract, lease, 
commitment or other arrangements required to be disclosed to its Board of 
Directors to which it is a party or by which it is otherwise bound.  Except 
as previously disclosed to its Board of Directors or in the Disclosure 
Schedules, the Company has in all material respects substantially performed 
all obligations required to be performed by it to date under such agreements. 
All of the foregoing agreements are in effect and enforceable according to 
their respective terms (except as the enforceability thereof may be limited 
by bankruptcy, insolvency, moratorium, reorganization or similar laws 
affecting the enforcement of creditors' rights generally, and except for 
judicial limitations on the enforcement of the remedy of specific performance 
and other equitable remedies), and there is not under any of such agreements 
any existing material default or event of default or event which, with notice 
or lapse of time or both, would constitute an event of default thereunder.  
All parties having material contractual arrangements with the Company are in 
substantial compliance therewith and none are in material default in any 
respect thereunder.

          5.15 CORPORATE ACTS AND PROCEEDINGS.  This Agreement has been duly 
authorized by all necessary corporate action on behalf of the Company, and 
has been duly executed and delivered by authorized officers of the Company.  
All corporate action necessary to the authorization, creation, issuance and 
delivery of the Notes, the Conversion Stock and the Security Agreement has 
been taken on the part of the Company, or will be taken by the Company on or 
prior to the Closing Date.  This Agreement is, and each of the Notes when 
issued pursuant to the terms of this Agreement will be, and the Security 
Agreement and the Manufacturing Agreement when executed and delivered 
pursuant to the terms of this Agreement will be, a valid and binding 
agreement of the Company enforceable in accordance with its terms, except as 
the enforceability thereof may be limited by bankruptcy, insolvency, 
moratorium, reorganization or other similar laws affecting the enforcement of 
creditors' rights generally, and except for judicial limitations on the 
enforcement of the remedy of specific enforcement and other equitable 
remedies.

          5.16 ACCOUNTS RECEIVABLE.  To the extent that they exceed the 
reserves for doubtful accounts set forth in the Financial Statements, the 
accounts receivable of the Company which are reflected in the Financial 
Statements and all of its accounts receivable which have arisen since the 
Balance Sheet Date (except such accounts receivable as have been collected 
since the Balance Sheet Date) are valid and enforceable claims, and the goods 
and services sold and delivered which gave rise to such accounts were sold 
and delivered in conformity with the applicable purchase orders, agreements 
and specifications.  Such 

                                     -8- 


accounts receivable are subject to no valid defense or offsets except routine 
customer complaints or warranty demands of an immaterial nature.  The reserve 
for doubtful accounts that is included in the Financial Statements is 
adequate.

          5.17 INVENTORIES.  The inventories of the Company which are 
reflected in the Financial Statements and all inventory items which have been 
acquired since the Balance Sheet Date consist of raw materials, supplies, 
work-in-process and finished goods of such quality and in such quantities as 
are currently useable or saleable in the ordinary course of its business.

          5.18 INSURANCE COVERAGE. There are in full force policies of 
insurance issued by insurers of recognized responsibility insuring the 
Company, its properties and business against such losses and risks, and in 
such amounts, as in the Company's best judgment, after advice from its 
insurance broker, are acceptable for the nature and extent of its business 
and the Company's resources.

          5.19 NO BROKERS OR FINDERS. Other than the International Business 
Group, which is owed $130,299.09 pursuant to the agreement with the Company 
dated 24 July 1995, the fees and reimbursable expenses of which shall be the 
sole obligation of the Company, no person, firm or corporation has or will 
have, as a result of any act or omission of the Company, any right, interest 
or valid claim against or upon the Company or Digi for any commission, fee or 
other compensation as a finder or broker, or in any similar capacity, in 
connection with the transactions contemplated by this Agreement.  

          The Company will indemnify and hold Digi harmless against any and 
all liability with respect to any such commission, fee or other compensation 
which may be payable or determined to be payable as a result of the actions 
of the Company in connection with the transactions contemplated by this 
Agreement.

          5.20 LICENSES. To the best of the Company's knowledge, the Company 
possesses from the appropriate agency, commission, board and government body 
and authority, whether state, local or federal, all licenses, permits, 
authorizations, approvals, franchises and rights which (a) are necessary for 
it to engage in the business currently conducted by it, and (b) if not 
possessed by the Company, would have an adverse impact on the Company's 
business.  The Company has no knowledge that would lead it to believe that it 
will not be able to obtain all licenses, permits, authorizations, approvals, 
franchises and rights that may be required for any business the Company 
proposes to conduct.

          5.21 REGISTRATION RIGHTS. Other than under this Agreement, the 
Company has not agreed to register any of its authorized or outstanding 
securities under the Securities Act.

          5.22 EMPLOYEE PLANS.  Each plan in which any of the Company's 
employees participate that is subject to any provisions of the employee 
Retirement Income Security act of 1974 and the regulations adopted pursuant 
thereto ("ERISA") is operated in accordance with applicable law, including 
ERISA and the Internal Revenue Code and regulations promulgated thereunder 
(the "Code"), and each such plan intended to be tax qualified is so 
qualified.  Each plan which is a "group health plan" as defined in the Code 
has not failed to comply in any material respect with the continuation 
coverage requirements imposed by the Code.

          5.23 ENVIRONMENTAL AND SAFETY LAWS.  To the best of the Company's 
knowledge:  The Company is not in violation of any applicable statute, law or 
regulation relating to the environment or occupational health and safety, and 
no material expenditures are or will be required in order to comply with any 
such existing statute, law or regulation; the operations of the Company do 
not involve any hazardous substances or materials including, but not limited 
to, hazardous substances or materials under the Comprehensive Environmental 
Response, Compensation and Liability Act, as amended by the Superfund 

                                     -9- 


Amendments and Reauthorization Act, the Resource Conservation and Recovery 
Act, the Minnesota Environmental Response and Liability Act, or any other 
federal, state or local statute, regulation, code or ordinance.

          5.24 EMPLOYEES.  To the best of the Company's knowledge:  No 
officer of the Company or employee of the Company whose annual compensation 
is in excess of $20,000 has any plans to terminate his or her employment with 
the Company; the Company has complied in all material respects with all laws 
relating to the employment of labor, including provisions relating to wages, 
hours, equal opportunity, collective bargaining and payment of Social 
Security and other taxes, and the Company has not encountered any material 
labor difficulties; the Company does not have any worker's compensation 
liabilities, except those reflected in the Financial Statements.

          5.25 ABSENCE OF RESTRICTIVE AGREEMENTS.  To the best of the 
Company's knowledge:  No employee of the Company is subject to any secrecy or 
non-competition agreement or any agreement or restriction of any kind that 
would impede in any way the ability of such employee to carry out fully all 
activities of such employee in furtherance of the business of the Company; no 
employer or former employer of any employee of the Company has any claim of 
any kind whatsoever in respect of any of the rights described in Section 5.10 
hereof.

          5.26 DISCLOSURE.  The Company has not knowingly withheld from Digi 
any material facts relating to the assets, business, operations, financial 
condition or prospects of the Company.  No representation or warranty in this 
Agreement or in any certificate, schedule, written statement or other 
document furnished to Digi pursuant hereto or in connection with the 
transactions contemplated hereby contains any untrue statement of a material 
fact or omits to state any material fact required to be stated herein or 
therein or necessary to make the statements herein or therein not misleading.

     6.   REPRESENTATIONS AND WARRANTIES OF DIGI.  Digi represents and 
warrants that:

          6.1  INVESTMENT INTENT.  The Notes being acquired and to be 
acquired by Digi hereunder are being purchased or will be purchased, and the 
Conversion Stock acquired by Digi upon conversion of such Notes will be 
acquired, for Digi's own account and not with the view to, or for resale in 
connection with, any distribution or public offering thereof within the 
meaning of the Securities Act.  Digi understands that the Notes and the 
Conversion Stock have not been registered under the Securities Act or any 
applicable state laws by reason of their issuance or contemplated issuance in 
a transaction exempt from the registration and prospectus delivery 
requirements of the Securities Act and such laws, and that the reliance of 
the Company upon this exemption is predicated in part upon this 
representation and warranty.  Digi further understands that the Notes and 
Conversion Stock may not be transferred or resold without (a) registration 
under the Securities Act and any applicable state securities laws, or (b) an 
exemption from the requirements of the Securities Act and applicable state 
securities laws.

     Digi understands that an exemption from such registration is not 
presently available pursuant to Rule 144 promulgated under the Securities Act 
by the Securities and Exchange Commission (the "Commission") and that in any 
event Digi may not sell any securities pursuant to Rule 144 prior to the 
expiration of a two-year period after Digi has acquired the securities.  Digi 
understands that any sales pursuant to Rule 144 may only be made in full 
compliance with the provisions of Rule 144.

          6.2  LOCATION OF PRINCIPAL OFFICE AND QUALIFICATION AS ACCREDITED 
INVESTOR.  Digi's principal office is located in Minnetonka, Minnesota.  Digi 
qualifies as an accredited investor within the meaning of Rule 501 under the 
Securities Act.  Digi has such knowledge and experience in financial and 
business matters that Digi is capable of evaluating the merits and risks of 
the investment to be made hereunder by Digi.  Digi has and has had access to 
all of the Company's material books and records and 

                                     -10- 


access to the Company's executive officers has been provided to Digi or to 
Digi's agents.

          6.3  ACTS AND PROCEEDINGS.  The Transaction Documents have been 
duly authorized by all necessary action on the part of Digi, have been duly 
executed and delivered by Digi, and are valid and binding agreements upon the 
part of Digi.

          6.4  NO BROKERS OR FINDERS.  No person, firm or corporation has or 
will have, as a result of any act or omission by Digi, any right, interest or 
valid claim against the Company for any commission, fee or other compensation 
as a finder or broker, or in any similar capacity, in connection with the 
transactions contemplated by this Agreement.  Digi will indemnify and hold 
the Company harmless against any and all liability with respect to any such 
commission, fee or other compensation which may be payable or determined to 
be payable as a result of the actions of Digi in connection with the 
transactions contemplated by this Agreement.

     7.   AFFIRMATIVE COVENANTS.  Subject to the provisions of Section 13 
hereof, the Company covenants and agrees that:

          7.1  CORPORATE EXISTENCE.  The Company will maintain its corporate 
existence in good standing and comply with all applicable laws and 
regulations of the United States or of any state or states thereof or of any 
political subdivision thereof and of any governmental authority where failure 
to so comply would have a material adverse impact on the Company or its 
business or operations.

          7.2  BOOKS OF ACCOUNT AND RESERVES.  The Company will keep books of 
record and account in which full, true and correct entries are made of all of 
its and their respective dealings, business and affairs, in accordance with 
generally accepted accounting principles.  The Company will employ certified 
public accountants selected by the Board of Directors of the Company who are 
"independent" within the meaning of the accounting regulations of the 
Securities and Exchange Commission ("Commission") and who are one of the 
so-called "Big Six" accounting firms, and have annual audits made by such 
independent public accountants in the course of which such accountants shall 
make such examinations, in accordance with generally accepted auditing 
standards, as will enable them to give such reports or opinions with respect 
to the financial statements of the Company as will satisfy the requirements 
of the Commission in effect at such time with respect to certificates and 
opinions of accountants.

          7.3  FURNISHING OF FINANCIAL STATEMENTS AND INFORMATION.  The 
Company will deliver to Digi:

          (a)  as soon as practicable, but in any event within 30 days after the
     close of each month, unaudited consolidated balance sheets of the Company
     as of the end of such month, together with the related consolidated
     statements of operations and cash flow for such month, all in reasonable
     detail and certified by the principal accounting officer of the Company;
     and

          (b)  as soon as practicable, but in any event within 90 days after the
     end of each fiscal year, a consolidated balance sheet of the Company as of
     the end of such fiscal year, together with the related consolidated
     statements of operations, shareholders' equity and cash flow for such
     fiscal year, all in reasonable detail and duly certified by the Company's
     independent public accountants, which accountants shall have given the
     Company an opinion, unqualified as to the scope of the audit, regarding
     such statements, provided that the audit may contain a qualification
     regarding the Company's ability to continue as a going concern or any other
     generally accepted qualifications for a similar ongoing concern; and

          (c)  concurrently with the delivery in each year of the financial
     statements referred 

                                     -11- 


     to in paragraph (b) of this Section 7.3, a statement and report signed by 
     the independent public accountants who certified such financial statements 
     to the effect that they have read this Agreement and that in the course of 
     the audit upon which their certificate was based they became aware of no 
     condition or event which constituted an Event of Default of the Company (as
     hereinafter defined) or which, after notice or lapse of time or both, would
     constitute an Event of Default of the Company or if such accountants did 
     become aware of any such condition or event, specifying the nature and 
     period of existence thereof.

          (d)  with reasonable promptness, such other financial data relating to
     the business, affairs and financial condition of the Company as is
     available to the Company and as Digi from time to time may reasonably
     request.

          7.4  PREPARATION AND APPROVAL OF BUSINESS PLAN AND BUDGETS.  On or 
before the next scheduled meeting of the Company's Board of Directors 
following execution of this Agreement, the Company shall prepare a business 
plan to be presented for approval by its Board of Directors at such meeting.  
In addition, prior to the beginning of the fiscal year ending September 30, 
1996, and thereafter of each fiscal year of the Company, the Company shall 
prepare and submit to the Board of Directors of the Company, for its review 
and approval, an annual plan for such year, which shall include capital and 
operating expense budgets, cash flow statements and profit and loss 
projections itemized in such detail as the Board of Directors of the Company 
may reasonably request.  The business and annual plans shall be modified as 
often as is necessary in the judgment of the Board of Directors of the 
Company and the Company's executive officers to reflect changes required as a 
result of operating results and other events that occur, or may be reasonably 
expected to occur, during the year covered by the annual plan. 

          7.5  PAYMENT OF TAXES AND MAINTENANCE OF PROPERTIES.  The Company 
will:

          (a)  pay and discharge promptly, or cause to be paid and discharged
     promptly when due and payable, all taxes, assessments and governmental
     charges or levies imposed upon it or upon its income or upon any of its
     properties, as well as all material claims of any kind (including claims
     for labor, material and supplies) which, if unpaid, might by law become a
     lien or charge upon its property; provided, however, that the Company shall
     not be required to pay any such tax, assessment, charge, levy or claim if
     the amount, applicability or validity thereof shall currently be contested
     in good faith by appropriate proceedings and if the Company shall have set
     aside on its books reserves (segregated to the extent required by generally
     accepted accounting principles) deemed adequate by it with respect thereto;
     and

          (b)  maintain and keep, or cause to be maintained and kept, its
     properties in good repair, working order and condition, and from time to
     time make, or cause to be made, all repairs and renewals and replacements
     which in the opinion of the Company are necessary and proper so that the
     business carried on in connection therewith may be properly and
     advantageously conducted at all times; the Company will maintain or cause
     to be maintained back-up copies of all valuable papers and software.

          7.6  INSURANCE.  The Company will obtain and maintain in force such
property damage, public liability, business interruption, worker's compensation,
indemnity bonds and other types of insurance as the Company's executive
officers, after consultation with an accredited insurance broker, shall
determine to be necessary or appropriate to protect the Company from the
insurable hazards or risks associated with the conduct of the Company's
business.  The Company's executive officers shall periodically report to the
Board of Directors on the status of such insurance coverage.  All insurance
shall be maintained in at least such amounts and to such extent as shall be
determined to be reasonable by the Board of Directors; and all such insurance
shall be effected and maintained in force under a policy or 

                                     -12- 


policies issued by insurers of recognized responsibility, except that the 
Company may effect worker's compensation or similar insurance in respect of 
operations in any state or other jurisdiction either through an insurance 
fund operated by such state or other jurisdiction or by causing to be 
maintained a system or systems of self-insurance which is in accord with 
applicable laws.

          7.7  PAYMENT OF INDEBTEDNESS AND DISCHARGE OF OBLIGATIONS.  The 
Company will pay or cause to be paid the principal of and interest and 
premium, if any, on all indebtedness for borrowed money heretofore or 
hereafter incurred or assumed by it when and as the same shall become due and 
payable, unless such indebtedness for borrowed money is renewed or extended, 
except in the case of the existing notes the holders of which will be offered 
the right to convert the indebtedness evidenced thereby to Common Stock 
pursuant to the terms of the Private Placement Memorandum previously approved 
by the Company's Board of Directors.  The Company will faithfully observe, 
perform and discharge all of the material covenants, conditions and 
obligations which are imposed on it by any and all indentures and other 
agreements securing or evidencing such indebtedness for borrowed money or 
pursuant to which such indebtedness for borrowed money is issued, and will 
not permit the continuance of any act or omission which is or under the 
provisions thereof may be declared to be a material default thereunder, 
unless such default is waived pursuant to the provisions thereof.  The 
Company shall not be required to make any payment or to take any other action 
by reason of this Section 7.7 at any time while it shall be currently 
contesting in good faith by appropriate proceedings its obligations to make 
such payment or to take such action provided that the Company shall have set 
aside on its books reserves (segregated to the extent required by generally 
accepted accounting principles) deemed adequate by it with respect thereto.  
For purposes of this Section 7.7, the phrase "indebtedness for borrowed 
money" shall have the meaning ascribed to it pursuant to Section 5.13 of this 
Agreement.

          7.8  DIRECTORS' AND SHAREHOLDERS' MEETINGS.  Until the earliest to 
occur of (i) repayment in full of the Notes if the Notes are not converted, 
or (ii) the date of the Company's Initial Public Offering, the Company shall 
have a Board of Directors the composition of which shall be determined as 
follows: (a) so long as it is the holder of any Notes or Conversion Stock, 
Digi shall be entitled to designate two fifths (2/5) of the directors of the 
Company and to exercise any right of removal or replacement of any such 
director, (b) the holders of a majority of the outstanding Common Stock 
exclusive of Digi shall be entitled to designate two fifths (2/5) of the 
directors of the Company and to exercise any right of removal or replacement 
of any such director, (c) the remaining director or directors must be 
approved by both Digi and by the holders of a majority of the outstanding 
Common Stock exclusive of Digi and shall be a person (or persons) who is 
(are) not otherwise affiliated with the Company or Digi or any officer or 
other director of the Company or Digi, and (e) Digi and the Company agree 
that in submitting to the Company's shareholders or Board of Directors the 
names of nominees for election as directors or in filling interim vacancies, 
each will use its best efforts to cause any person designated pursuant to 
this Section 7.8 to be elected as a director.  Failure of any of the persons 
so designated by the Company or Digi to be so elected shall be an Event of 
Default of the Company or an Event of Default of Digi respectively within the 
meaning of Section 11 hereof.

     The Company shall reimburse all directors elected for the reasonable 
out-of-pocket expenses incurred by them pursuant to this Section 7.8 in 
connection with the attending of meetings by their director designee or 
carrying out any other duties by such director designee that may be specified 
by the Board of Directors; shall maintain at all times, director and officer 
liability insurance in an amount of not less than $1 million from a carrier 
reasonably acceptable to the Board of Directors of the Company; and shall 
maintain as part of its Articles of Incorporation or Bylaws a provision for 
the indemnification of its directors to the full extent permitted by law.

          7.9  RESERVATION OF SHARES; REPLACEMENT OF NOTES OR CERTIFICATES 
REPRESENTING CONVERSION STOCK.  The Company shall at all times have authorized 
and reserved a sufficient number of 

                                     -13- 


shares of its Common Stock for the purpose of issue upon the conversion of 
the Notes.  Upon receipt of evidence reasonably satisfactory to the Company 
of the loss, theft, destruction or mutilation of any Notes or certificates 
representing Conversion Stock, and, in the case of any such loss, theft or 
destruction, upon delivery of a bond of indemnity satisfactory to the 
Company, or, in the case of any such mutilation, upon surrender and 
cancellation of the Notes or certificates representing Conversion Stock, as 
the case may be, the Company will issue new Notes or certificates 
representing Conversion Stock of like tenor, in lieu of such lost, stolen, 
destroyed or mutilated Notes or certificates representing Conversion Stock.

          7.10 APPLICATION OF PROCEEDS. Unless otherwise approved by the 
Company's Board of Directors, the net proceeds received by the Company from 
the sale of the Notes shall be used to pay the existing payables and 
indebtedness, for general operating purposes, and for the development of the 
ARMs, Jeeves and V.Mach.  Pending such use of the proceeds, they shall be 
deposited in a bank or banks having deposits of $150,000,000 or more, 
invested in money market mutual funds having assets of $500,000,000 or more, 
or invested in securities issued or guaranteed by the United States 
Government or the agencies or instrumentalities thereof.

          7.11 RETIREMENT PLANS.  The Company will cause each retirement plan 
of the Company in which any employees of the Company participate that is 
subject to the provisions of ERISA and the documents and instruments 
governing each such plan to be conformed to when necessary, and to be 
administered in a manner consistent with, those provisions of ERISA which 
may, from time to time, become effective and operative with respect to such 
plans; and at such time as such insurance shall be available at rates deemed 
commercially reasonable by the Company, maintain insurance against the 
contingent liability against the net worth of the Company imposed in respect 
of each such plan by the provisions of ERISA.

          7.12 FILING OF REPORTS.  The Company will, from and after such time 
as it has securities registered pursuant to Section 12 of the Securities 
Exchange Act of 1934, as amended, or has securities registered pursuant to 
the Securities Act, make timely filing of such reports as are required to be 
filed by it with the Commission so that Rule 144 under the Securities Act or 
any successor provision thereto will be available to the security holders of 
the Company who are otherwise able to take advantage of the provisions of 
such Rule.

          7.13 PATENTS AND OTHER INTANGIBLE RIGHTS.  The Company will apply 
for, or obtain assignments of, or licenses to use, all patents, trademarks, 
trademark rights, trade names, trade name rights and copyrights which in the 
opinion of a prudent and experienced businessperson operating in the industry 
in which the Company is operating are desirable or necessary for the conduct 
and protection of the business of the Company.

          7.14 RULE 144A.  The Company agrees that, upon Digi's request, the 
Company shall promptly provide (but in any case within 15 days of a request) 
to Digi the following information:  (a) a brief statement of the nature of 
the business of the Company and the products and services it offers; (b) the 
Company's most recent consolidated balance sheets and profit and loss and 
retained earnings statements, and similar financial statements for such part 
of the two preceding fiscal years prior to such request as the Company has 
been in operation (such financial information shall be audited, to the extent 
reasonably available); and (c) such other information about the Company and 
its business, financial condition and results of operations as the requesting 
person shall specify in order to comply with Rule 144A promulgated under the 
Securities Act and the anti-fraud provisions of the federal and state 
securities laws.

     The Company hereby represents and warrants to any such requesting person 
that the information provided by the Company pursuant to this Section 7.14 
will not contain any untrue statement of a material fact or omit to state a 
material fact necessary in order to make the statements made, in light of the

                                     -14- 


circumstances under which they were made, not misleading.

     8.   NEGATIVE COVENANTS.  Subject to the provisions of Section 13 
hereof, the Company will be limited and restricted as follows:

          8.1  CONSOLIDATION, MERGER, ACQUISITION, ETC.  Without the prior 
approval of Digi, (a) the Company will not sell, lease, license or otherwise 
dispose of all or substantially all of its assets or any asset or assets in a 
manner which would require shareholder approval, and (b) the Company will not 
consolidate with or merge into any other corporation or entity, or permit any 
other corporation or entity to consolidate or merge into the Company, or 
enter into a plan of exchange with any other corporation or entity, or 
otherwise acquire any other corporation or entity; provided that the 
foregoing shall not apply to any transaction between the Company and a 
wholly-owned subsidiary.

          8.2  DIVIDENDS ON OR REDEMPTION OF CAPITAL STOCK.  Without the 
prior approval of Digi, which approval shall not be unreasonably withheld, 
the Company will not declare or pay any dividend or make any other 
distribution on any shares of capital stock or purchase, redeem or otherwise 
acquire for any consideration, or set aside a sinking fund or other fund for 
the redemption or repurchase of any shares of capital stock or any warrants, 
rights or options to purchase shares of capital stock.  

          8.3  ISSUANCE OF SECURITIES.  Except as provided in the Disclosure 
Schedules, as disclosed to the Company's Board of Directors prior to the date 
of this Agreement or pursuant to a stock option plan approved by the 
Company's Board of Directors, the Company will not, without the prior 
approval of Digi, issue (i) any additional capital stock of the Company of 
any class, or securities convertible into any such class, or (ii) any 
options, warrants or other rights to purchase capital stock of the Company of 
any class, or securities convertible into shares of any such class.  

          8.4  CHANGE IN THE NATURE OF THE COMPANY'S BUSINESS.  The Company 
will not, without the prior approval of Digi, which approval shall not be 
unreasonably withheld, make any material change in the nature of its business 
as carried on or as proposed to be carried out as of the date of this 
Agreement.  

          8.5  FUTURE REGISTRATION RIGHTS.  Except for any registration 
expressly permitted by Section 10 hereof, the Company will not, without the 
prior approval of the Company's Board of Directors, agree with the holders of 
any securities issued or to be issued by the Company to register such 
securities under the Securities Act nor will it grant any incidental 
registration rights.

          8.6  OTHER RESTRICTIONS.  The Company will not without the prior 
approval of the Company's Board of Directors:

          (a)  guarantee, endorse or otherwise be or become contingently liable
     in connection with the obligations, securities or dividends of any person,
     firm, association or corporation, other than endorse negotiable instruments
     for collection in the ordinary course of business; or

          (b)  make loans or advances to any person (including without
     limitation to any officer, director or shareholder of the Company), firm,
     association or corporation, except loans and advances to the Company and
     advances to suppliers and employees made in the ordinary course of
     business; or

          (c)  purchase or invest in the stock or obligations of any other
     person, firm or corporation; or

          (d)  pay compensation, whether by way of salaries, bonuses, 
     participations in 

                                     -15- 


     pension or profit sharing plans, fees under management contracts or for 
     professional services or fringe benefits to any officer in excess of 
     amounts fixed by the Board of Directors of the Company prior to any payment
     to such officer.

     9.   RESTRICTION ON TRANSFER OF SECURITIES.

          9.1  RESTRICTIONS.  The Notes and the Conversion Stock are 
transferable only pursuant to (a) a public offering registered under the 
Securities Act, (b) Rule 144 (or any similar rule then in effect) adopted 
under the Securities Act, if such rule is available, and (c) subject to the 
conditions elsewhere specified in this Section 9, any other legally available 
means of transfer.

          9.2  LEGEND.  Each Note shall be endorsed with the following legend:

          "The securities evidenced hereby may not be transferred without
     (i) the opinion of counsel satisfactory to the Company that such
     transfer may be lawfully made without registration under the Federal
     Securities Act of 1933 and all applicable state securities laws or
     (ii) such registration."

Upon the conversion of any Notes, unless the Company receives an opinion of 
counsel from Digi satisfactory to the Company to the effect that a sale, 
transfer, assignment, pledge or distribution of the Conversion Stock issuable 
upon such conversion may be made without registration, or unless such 
Conversion Stock is being disposed of pursuant to registration under the 
Securities Act and any applicable state act, the same legend shall be 
endorsed on the certificate evidencing such Conversion Stock.

          9.3  STOP TRANSFER ORDER.  A stop transfer order shall be placed 
with the Company's transfer agent preventing transfer of any of the 
securities subject to the legend referred to in Section 9.2 above pending 
compliance with the conditions set forth in any such legend.

          9.4  REMOVAL OF LEGEND.  Any legend endorsed on a certificate or 
instrument evidencing a security pursuant to Section 9.2 hereof shall be 
removed, and the Company shall issue a certificate or instrument without such 
legend to Digi, if such security is being disposed of pursuant to 
registration under the Securities Act and any applicable state acts or 
pursuant to Rule 144 or any similar rule then in effect, or if Digi provides 
the Company with an opinion of counsel satisfactory to the Company to the 
effect that a sale, transfer, assignment, offer, pledge or distribution for 
value of such security may be made without registration and that such legend 
is not required to satisfy the applicable exemption from registration.

     10.  REGISTRATION OF SECURITIES.

          10.1 DIGI DEMAND FOR REGISTRATION.  If the Company shall receive a 
written request therefor from Digi, the Company shall prepare and file a 
registration statement under the Securities Act covering the Conversion Stock 
which is the subject of such request and shall use its best efforts to cause 
such registration statement to become effective; provided, however, Digi may 
not make such a request prior to the expiration of six (6) months from the 
date of this Agreement.  In addition, if the registration requested by Digi 
would result in the Company's first registration of securities under the 
Securities Act, the Company shall have the right to defer filing such 
registration for a period of not more than twelve (12) months after the 
Company's receipt of Digi's request. The Company shall be obligated to 
prepare, file and cause to become effective only one registration statement 
(other than on Form S-3 or any successor form promulgated by the Commission 
("Form S-3")) pursuant to this Section 10.1, and to pay the expenses 
associated with such registration statements; notwithstanding the foregoing, 
Digi may require, pursuant to this Section 10.1, the Company to file, and to 
pay the expenses associated with, any number of registration 

                                     -16- 


statements on Form S-3, if such form is then available for use by the Company 
and such record holder or holders.  In the event that Digi determines for any 
reason not to proceed with a registration at any time before a registration 
statement has been declared effective by the Commission, and such 
registration statement, if theretofore filed with the Commission, is 
withdrawn with respect to the Conversion Stock covered thereby, and Digi 
agrees to bear its own expenses incurred in connection therewith and to 
reimburse the Company for the expenses incurred by it attributable to the 
registration of such Conversion Stock, then Digi shall not be deemed to have 
exercised its right to require the Company to register Conversion Stock 
pursuant to this Section 10.1, provided, however, that in such event Digi may 
not exercise its deferral rights under Section 10.2 should the Company 
determine to continue with such a registration.  

     If, at the time any written request for registration is received by the 
Company pursuant to this Section 10.1, the Company has determined to proceed 
with the actual preparation and filing of a registration statement under the 
Securities Act in connection with the proposed offer and sale for cash of any 
of its securities by it or any of its security holders, such written request 
shall be deemed to have been given pursuant to Section 10.2 hereof rather 
than this Section 10.1, and the rights of Digi covered by such written 
request shall be governed by Section 10.2 hereof.

          10.2 INCIDENTAL REGISTRATION.  Each time the Company shall 
determine to proceed with the actual preparation and filing of a registration 
statement under the Securities Act in connection with the proposed offer and 
sale for cash of any of its securities by it or any of its security holders 
(other than a registration statement on a form that does not permit the 
inclusion of shares by its security holders), the Company will give written 
notice of its determination to Digi.  If the registration which is the 
subject of the notice to Digi by the Company would result in the Company's 
first registration of securities under the Securities Act, Digi shall have 
the right to defer filing such registration for a period of not more than 
twelve (12) months after Digi's receipt of the Company's notice.  Upon the 
written request of Digi given within 30 days after receipt of any such notice 
from the Company, the Company will, except as herein provided, cause all 
Conversion Stock for which Digi has requested registration to be included in 
such registration statement, all to the extent requisite to permit the sale 
or other disposition by Digi of such Conversion Stock; provided, however, 
that nothing herein shall prevent the Company from, at any time, abandoning 
or delaying any such registration initiated by it; provided further, however, 
that if the Company determines not to proceed with a registration after the 
registration statement has been filed with the Commission and the Company's 
decision not to proceed is primarily based upon the anticipated public 
offering price of the securities to be sold by the Company, and if Digi so 
requests the Company shall promptly complete the registration for Digi's 
benefit and Digi shall bear all expenses in excess of $25,000 incurred by the 
Company as the result of such registration after the Company has decided not 
to proceed.  If any registration pursuant to this Section 10.2 shall be 
underwritten in whole or in part, the Company may require that the Conversion 
Stock requested for inclusion pursuant to this Section 10.2 be included in 
the underwriting on the same terms and conditions as the securities otherwise 
being sold through the underwriters.  In the event that the Conversion Stock 
requested for inclusion pursuant to this Section 10.2 would constitute more 
than 25% of the total number of shares to be included in a proposed 
underwritten public offering, and if in the good faith judgment of the 
managing underwriter of such public offering the inclusion of all of the 
Conversion Stock originally covered by a request for registration would 
reduce the number of shares to be offered by the Company or interfere with 
the successful marketing of the shares of stock offered by the Company, the 
number of Conversion Stock otherwise to be included in the underwritten 
public offering may be reduced.  Conversion Stock which is thus excluded from 
the underwritten public offering shall be withheld from the market by Digi 
for a period not to exceed 90 days, which the managing underwriter reasonably 
determines is necessary in order to effect the underwritten public offering.

          10.3 REGISTRATION PROCEDURES.  If and whenever the Company is 
required by the 

                                     -17- 


provisions of Section 10.1 or 10.2 hereof to effect the registration of 
Conversion Stock under the Securities Act, the Company will:

          (a)  prepare and file with the Commission a registration statement
     with respect to such securities, and use its best efforts to cause such
     registration statement to become and remain effective for such period as
     may be reasonably necessary to effect the sale of such securities, not to
     exceed nine months;

          (b)  prepare and file with the Commission such amendments to such
     registration statement and supplements to the prospectus contained therein
     as may be necessary to keep such registration statement effective for such
     period as may be reasonably necessary to effect the sale of such
     securities, not to exceed nine months;

          (c)  furnish to Digi and to the underwriters of the securities being
     registered such reasonable number of copies of the registration statement,
     preliminary prospectus, final prospectus and such other documents as such
     underwriters may reasonably request in order to facilitate the public
     offering of such securities;

          (d)  use its best efforts to register or qualify the securities
     covered by such registration statement under such state securities or blue
     sky laws of such jurisdictions as Digi may reasonably request in writing
     within 20 days following the original filing of such registration
     statement, except that the Company shall not for any purpose be required to
     execute a general consent to service of process or to qualify to do
     business as a foreign corporation in any jurisdiction wherein it is not so
     qualified;

          (e)  notify Digi, promptly after it shall receive notice thereof, of
     the time when such registration statement has become effective or a
     supplement to any prospectus forming a part of such registration statement
     has been filed;

          (f)  notify Digi promptly of any request by the Commission for the
     amending or supplementing of such registration statement or prospectus or
     for additional information;

          (g)  prepare and file with the Commission, promptly upon the request
     of Digi, any amendments or supplements to such registration statement or
     prospectus which, in the opinion of counsel for Digi (and concurred in by
     counsel for the Company), is required under the Securities Act or the rules
     and regulations thereunder in connection with the distribution of the
     Conversion Stock by Digi;

          (h)  prepare and promptly file with the Commission and promptly notify
     Digi of the filing of such amendment or supplement to such registration
     statement or prospectus as may be necessary to correct any statements or
     omissions if, at the time when a prospectus relating to such securities is
     required to be delivered under the Securities Act, any event shall have
     occurred as the result of which any such prospectus or any other prospectus
     as then in effect would include an untrue statement of a material fact or
     omit to state any material fact necessary to make the statements therein,
     in the light of the circumstances in which they were made, not misleading;

          (i)  advise Digi, promptly after it shall receive notice or obtain
     knowledge thereof, of the issuance of any stop order by the Commission
     suspending the effectiveness of such registration statement or the
     initiation or threatening of any proceeding for that purpose and promptly
     use its best efforts to prevent the issuance of any stop order or to obtain
     its withdrawal if such stop order should be issued;

                                     -18- 


          (j)  not file any amendment or supplement to such registration
     statement or prospectus to which Digi shall have reasonably objected on the
     grounds that such amendment or supplement does not comply in all material
     respects with the requirements of the Securities Act or the rules and
     regulations thereunder, after having been furnished with a copy thereof at
     least five business days prior to the filing thereof, unless in the opinion
     of counsel for the Company the filing of such amendment or supplement is
     reasonably necessary to protect the Company from any liabilities under any
     applicable federal or state law and such filing will not violate applicable
     law; and

          (k)  at the request of Digi, furnish:  (i) an opinion, dated as of the
     closing date, of the counsel representing the Company for the purposes of
     such registration, addressed to the underwriters, if any, and to Digi,
     covering such matters as such underwriters and Digi may reasonably request;
     and (ii) letters dated as of the effective date of the registration
     statement and as of the closing date, from the independent certified public
     accountants of the Company, addressed to the underwriters, if any, and to
     Digi, covering such matters as such underwriters and Digi may reasonably
     request.

          10.4 EXPENSES.  With respect to each registration, including 
registrations pursuant to Form S-3, requested pursuant to Section 10.1 hereof 
(except as otherwise provided in such Section with respect to registrations 
voluntarily terminated at the request of Digi) and with respect to each 
inclusion of Conversion Stock in a registration statement pursuant to Section 
10.2 hereof (except as otherwise provided in Section 10.2 with respect to 
registrations initiated by the Company but with respect to which the Company 
has determined not to proceed), the Company shall bear the following fees, 
costs and expenses:  all registration, filing and NASD fees, printing 
expenses, fees and disbursements of counsel and accountants for the Company, 
fees and disbursements of counsel for the underwriter or underwriters of such 
securities (if the Company and/or Digi are required to bear such fees and 
disbursements), all internal Company expenses, all legal fees and 
disbursements and other expenses of complying with state securities or blue 
sky laws of any jurisdictions in which the securities to be offered are to be 
registered or qualified, and the premiums and other costs of policies of 
insurance against liability (if any) arising out of such public offering.  
Fees and disbursements of counsel and accountants for Digi, underwriting 
discounts and commissions and transfer taxes relating to the shares included 
in the offering by Digi, and any other expenses incurred by Digi not 
expressly included above, shall be borne by Digi.

          10.5 INDEMNIFICATION.  In the event that any Conversion Stock is
included in a registration statement under Section 10.1 or 10.2 hereof:

          (a)  The Company will indemnify and hold harmless Digi pursuant to the
     provisions of this Section 10, its directors and officers, and any
     underwriter (as defined in the Securities Act) for Digi and each person, if
     any, who controls Digi or such underwriter within the meaning of the
     Securities Act, from and against, and will reimburse Digi and each such
     underwriter and controlling person with respect to, any and all loss,
     damage, liability, cost and expense to which Digi or any such underwriter
     or controlling person may become subject under the Securities Act or
     otherwise, insofar as such losses, damages, liabilities, costs or expenses
     are caused by any untrue statement or alleged untrue statement of any
     material fact contained in such registration statement, any prospectus
     contained therein or any amendment or supplement thereto, or arise out of
     or are based upon the omission or alleged omission to state therein a
     material fact required to be stated therein or necessary to make the
     statements therein, in light of the circumstances in which they were made,
     not misleading; provided, however, that the Company will not be liable in
     any such case to the extent that any such loss, damage, liability, cost or
     expense arises out of or is based upon an untrue statement or alleged
     untrue statement or omission or alleged omission so 

                                     -19- 


     made in conformity with information furnished by Digi, such underwriter or 
     such controlling person in writing specifically for use in the preparation
     thereof.

          (b)  Digi will indemnify and hold harmless the Company, its directors
     and officers, any controlling person and any underwriter from and against,
     and will reimburse the Company, its directors and officers, any controlling
     person and any underwriter with respect to, any and all loss, damage,
     liability, cost or expense to which the Company or any controlling person
     and/or any underwriter may become subject under the Securities Act or
     otherwise, insofar as such losses, damages, liabilities, costs or expenses
     are caused by any untrue or alleged untrue statement of any material fact
     contained in such registration statement, any prospectus contained therein
     or any amendment or supplement thereto, or arise out of or are based upon
     the omission or the alleged omission to state therein a material fact
     required to be stated therein or necessary to make the statements therein,
     in light of the circumstances in which they were made, 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 so made in
     reliance upon and in strict conformity with written information furnished
     by Digi specifically for use in the preparation thereof.

          (c)  Promptly after receipt by an indemnified party pursuant to the
     provisions of paragraph (a) or (b) of this Section 10.5 of notice of the
     commencement of any action involving the subject matter of the foregoing
     indemnity provisions such indemnified party will, if a claim thereof is to
     be made against the indemnifying party pursuant to the provisions of said
     paragraph (a) or (b), promptly notify the indemnifying party of the
     commencement thereof; but the omission to so notify the indemnifying party
     will not relieve it from any liability which it may have to any indemnified
     party otherwise than hereunder.  In case such action is brought against any
     indemnified party and it notifies the indemnifying party of the
     commencement thereof, the indemnifying party shall have the right to
     participate in, and, to the extent that it may wish, jointly with any other
     indemnifying party similarly notified, to assume the defense thereof, with
     counsel satisfactory to such indemnified party, provided, however, if the
     defendants in any action include both the indemnified party and the
     indemnifying party and the indemnified party shall have reasonably
     concluded that there may be legal defenses available to it and/or other
     indemnified parties which are different from or additional to those
     available to the indemnifying party, or if there is a conflict of interest
     which would prevent counsel for the indemnifying party from also
     representing the indemnified party, the indemnified party or parties shall
     have the right to select separate counsel to participate in the defense of
     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, the indemnifying party will not be liable to
     such indemnified party pursuant to the provisions of said paragraph (a) or
     (b) for any legal or other expense subsequently incurred by such
     indemnified party in connection with the defense thereof other than
     reasonable costs of investigation, unless (i) the indemnified party shall
     have employed counsel in accordance with the proviso of the preceding
     sentence, (ii) the indemnifying party shall not have employed counsel
     satisfactory to the indemnified party to represent the indemnified party
     within a reasonable time after the notice of the commencement of the
     action, or (iii) the indemnifying party has authorized the employment of
     counsel for the indemnified party at the expense of the indemnifying party.

          11.  DEFAULT.

          11.1 EVENTS OF DEFAULT BY THE COMPANY.  Each of the following events
shall be an event of default by the Company for purposes of this Agreement (an
"Event of Default of the Company"):

          (a)  if default shall be made in the punctual payment of interest on
     the Notes, and 

                                     -20- 


     such default shall have continued for a period of 15 days after written 
     notice thereof to the Company by Digi;

          (b)  if default shall be made in the punctual payment of the principal
     of the Notes;

          (c)  if any judgment, writ or warrant of attachment or of any similar
     process in an amount in excess of $250,000 shall be entered or filed
     against the Company or against any of its property or assets and either
     remains unpaid, unvacated, unbonded or unstayed for a period of 30 days or
     adequate reserves are not established on the Company's books;

          (d)  if an order for relief shall be entered in any Federal bankruptcy
     proceeding in which the Company is the debtor; or if bankruptcy,
     reorganization, arrangement, insolvency, or liquidation proceedings, or
     other proceedings for relief under any bankruptcy or similar law or laws
     for the relief of debtors, are instituted by or against the Company and, if
     instituted against the Company, are consented to or, if contested by the
     Company, are not dismissed by the adverse parties or by an order, decree or
     judgment within 60 days after such institution;

          (e)  if the Company shall default in any material respect in the due
     and punctual performance of any covenant or agreement in any note
     (including without limitation any of the Notes), bond, indenture, loan
     agreement, note agreement, mortgage, security agreement including without
     limitation the Security Agreement) or other instrument evidencing or
     related to indebtedness for borrowed money, other than the outstanding
     notes described in Section 7.7 hereof, and such default shall continue for
     more than the period of notice and/or grace, if any, therein specified and
     shall not have been waived;

          (f)  (i) if any representation or warranty made by or on behalf of the
     Company in this Agreement or in any certificate, report or other instrument
     delivered under or pursuant to any term hereof or thereof shall prove to
     have been untrue or incorrect in any material respect as of the date of
     this Agreement or as of any Closing Date, or (ii) if any report,
     certificate, financial statement or financial schedule or other instrument
     prepared or purported to be prepared by the Company or any officer of the
     Company furnished or delivered under or pursuant to this Agreement after
     any such Closing Date shall prove to be untrue or incorrect in any material
     respect as of the date it was made, furnished or delivered;

          (g)  if any of Digi's designees to the Company's Board of Directors
     shall fail to be elected to the Board of Directors in the manner and under
     the terms and conditions set forth in Section 7.8 hereof; or

          (h)  if default shall be made by the Company in the due and punctual
     performance or observance of any other term contained in this Agreement or
     in any other Transaction Document, and such default shall not have been
     remedied, or the Company shall have not taken steps to remedy such default
     to Digi's reasonable satisfaction, within 15 days after written notice
     thereof to the Company by Digi.

          11.2 EVENTS OF DEFAULT BY DIGI.  Each of the following events shall be
an event of default by Digi for purposes of this Agreement (an "Event of Default
of Digi"):

          (a)  Digi does not purchase a Note when required by the terms and
     conditions contained in this Agreement;

                                     -21- 


          (b)  if default shall be made by Digi in any material respect in the
     performance or observance of any other term contained in this Agreement or
     in any other Transaction Document, and such default shall not have been
     remedied, or Digi shall have not taken steps to remedy such default to the
     Company's reasonable satisfaction, within 15 days after written notice
     thereof to Digi by the Company;

          (c)  (i) if any representation or warranty made by or on behalf of
     Digi in this Agreement or in any certificate, report or other instrument
     delivered under or pursuant to any term hereof or thereof shall prove to
     have been untrue or incorrect in any material respect as of the date of
     this Agreement or (ii) if any report, certificate, financial statement or
     financial schedule or other instrument prepared or purported to be prepared
     by Digi or any officer of Digi furnished or delivered under or pursuant to
     this Agreement after any such Closing Date shall prove to be untrue or
     incorrect in any material respect as of the date it was made, furnished or
     delivered.

          11.3 REMEDIES UPON EVENTS OF DEFAULT OF THE COMPANY.  Upon the
occurrence of an Event of Default of the Company as herein defined, then, unless
such Event of Default shall have been waived by Digi, Digi shall be entitled so
long as such Event of Default of the Company continues unremedied, by notice to
the Company (a) to declare the principal of and any accrued interest on the
Notes, to be immediately due and payable, and thereupon the Notes, including
both principal and interest shall become immediately due and payable (provided,
however, that when any Event of Default of the Company described in
Section 11.1(d) hereof has occurred, the Notes shall immediately become due and
payable without presentment, demand or notice of any kind), and (b) to designate
a majority of the Board of Directors of the Company, as provided in Section 11.4
below.
     
          11.4 DESIGNATION OF MAJORITY OF BOARD OF DIRECTORS.  In the event Digi
is entitled to designate a majority of the Board of Directors of the Company
pursuant to Section 11.3 hereof, the Company shall, immediately upon receiving
written notice from Digi, call a special shareholders' meeting to be held as
soon as possible, but in any event within fifteen days of the date of the notice
of such meeting.  At such special shareholders' meeting a majority of the
directors of the Company shall be elected from designees nominated by Digi.  Any
right of Digi to continue to designate a majority of the Board of Directors of
the Company shall expire, and a shareholders' meeting to elect new directors
shall be called, six months after the later of (a) the curing of the Event of
Default upon which the right was exercised, or (b) the curing of any Event of
Default occurring after the Event of Default upon which such right was
exercised.

          11.5 NOTICE OF DEFAULTS.  When, to its knowledge, any Event of Default
of the Company has occurred or exists, the Company agrees to give prompt written
notice of such Event of Default of the Company, to Digi, but in any event within
ten business days.  When, to its knowledge, any Event of Default of Digi has
occurred or exists, Digi agrees to give prompt written notice of such Event of
Default of Digi, to the Company, but in any event within ten business days.

          11.6 SUITS FOR ENFORCEMENT; REMEDIES CUMULATIVE AND NOT WAIVED.  In
case an Event of Default of the Company shall have occurred and be continuing,
unless such Event of Default of the Company shall have been waived in the manner
provided in Section 13 hereof, Digi may proceed to protect and enforce its
rights under this Section 11 by suit in equity or action at law.  In case an
Event of Default of Digi shall have occurred and be continuing, unless such
Event of Default of Digi shall have been waived in the manner provided in
Section 13 hereof, the Company may proceed to protect and enforce its rights
under this Agreement by suit in equity or action at law.  No right, power or
remedy conferred upon either Party hereto shall be exclusive, and each such
right, power or remedy shall be cumulative and in addition to every other right,
power or remedy, whether conferred hereby or by any such security or now or
hereafter available at law or in equity or by statute or otherwise.  No course
of dealing between the 

                                     -22- 


Company and Digi and no delay in exercising any right, power or remedy 
conferred hereby or by any such security or now or hereafter existing at law 
or in equity or by statute or otherwise, shall operate as a waiver of or 
otherwise prejudice any such right, power or remedy; provided, however, that 
this sentence shall not be construed or applied so as to negate the 
provisions and intent of any statute which is otherwise applicable.

     12.  TERMINATION OF CERTAIN COVENANTS.  The obligations of the Company
under Sections 7 (other than its obligations under Sections 7.8, 7.9 and 7.14
hereof), 8 and 11.1 of this Agreement and the obligations of Digi under section
11.2 shall notwithstanding any provisions hereof apparently to the contrary,
terminate and be of no further force or effect from and after the earlier of the
repayment in full of the Notes or the Initial Public Offering of the Company. 
The obligation of Digi to purchase Notes of the Company shall terminate upon the
earlier of December 31, 1988 or the Initial Public Offering of the Company.

     13.  CONSENTS; WAIVERS AND AMENDMENTS.  With the written consent of either
Party hereto, any obligation of the other Party to this Agreement may be waived
(either generally or in a particular instance and either retroactively or
prospectively), and by mutual written consent the Parties may enter into a
supplementary agreement for the purpose of adding any provisions to or changing
in any manner or eliminating any of the provisions of this Agreement or of any
supplemental agreement or modifying in any manner the rights and obligations of
either Party.

     14.  CHANGES, WAIVERS, ETC.  Neither this Agreement nor any provision
hereof may be changed, waived, discharged or terminated orally, but only by a
statement in writing signed by the Party against which enforcement of the
change, waiver, discharge or termination is sought.

     15.  PAYMENT OF FEES AND EXPENSES.  Each Party will bear the out-of-pocket
expenses incurred by it in connection with the transactions herein contemplated,
including without limitation the fees and out-of-pocket expenses of agents,
finders (if any) and counsel.  

     16.  NOTICES.  All notices, requests, consents and other communications
required or permitted hereunder shall be in writing and shall be delivered, or
mailed first-class postage prepaid, registered or certified mail,

          (a)  if to Digi, addressed to it at 11001 Bren Road East, Minnetonka
     MN 55343, Attn: Chief Financial Officer, or at such other address as Digi
     may specify by written notice to the Company, or

          (b)  if to the Company, addressed to it at 10000 West 76th Street,
     Eden Prairie, MN 55344-3767, Attn: Dr. Jonathan A. Henrikssen Sachs, with
     a copy to William T. Dolan, Esq., Briggs and Morgan P.A., 2400 IDS Center,
     Minneapolis, Minnesota 55402 or to such other addresses as the Company may
     specify by written notice to Digi,

and such notices and other communications shall for all purposes of this 
Agreement be treated as being effective or having been given if delivered 
personally, or, if sent by certified mail, when received.

     17.  PARTIES IN INTEREST.  All the terms and provisions of this Agreement
shall be binding upon and inure to the benefit of and be enforceable by the
respective successors and assigns of the Parties hereto.

     18.  HEADINGS.  The headings of the Sections and paragraphs of this 
Agreement have been inserted for convenience of reference only and do not 
constitute a part of this Agreement.

                                     -23- 


     19.  CHOICE OF LAW.  It is the intention of the Parties that the laws of
Minnesota shall govern the validity of this Agreement, the construction of its
terms and the interpretation of the rights and duties of the Parties.

     20.  COUNTERPARTS.  This Agreement may be executed concurrently 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.

     IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date
first above written.

                                   DIGI INTERNATIONAL INC.


                                   By         /s/  ERVIN F. KAMM, JR.          
                                     ----------------------------------------- 
                                     Name: Ervin F. Kamm, Jr.
                                     Its:  President & C.E.O.

                                   AETHERWORKS CORPORATION


                                   By /s/ JONATHAN A. HENRIKSSEN SACHS, Ph.D.  
                                     ----------------------------------------- 
                                     Name: Jonathan A. Henrikssen Sachs, Ph.D.
                                     Its:  President & C.E.O.









                                     -24-