CERTIFICATE OF DESIGNATION
                                       OF
                            SERIES C PREFERRED STOCK
                                       OF
                               INPUT/OUTPUT, INC.

       Pursuant to Section 151(g) of the Delaware General Corporation Law, 
Input/Output, Inc., a corporation organized and existing under the laws of 
the State of Delaware (the "COMPANY"), hereby certifies that the following 
resolution was duly adopted by the Board of Directors of the Company on April 
21, 1999, pursuant to authority conferred upon the Board of Directors by the 
Certificate of Incorporation of the Company (the "CERTIFICATE OF 
INCORPORATION"), which authorizes the issuance of up to 5,000,000 shares of 
preferred stock, $0.01 par value.

       RESOLVED, that pursuant to authority expressly granted to and vested 
in the Board of Directors of the Company and pursuant to the provisions of 
the Certificate of Incorporation, the Board of Directors hereby creates a 
series of preferred stock, herein designated and authorized as the Series C 
Preferred Stock, $0.01 par value per share, which shall consist of 
[insert number up to 15,000] of the 5,000,000 shares of preferred stock which 
the Company now has authority to issue, and the Board of Directors hereby 
fixes the powers, designations, preferences and relative, participating, 
optional and other special rights of the shares of such series, and the 
qualifications, limitations and restrictions thereof as follows:

       1.      NUMBER AND RANK.  The number of shares constituting the Series 
C Preferred Stock shall be [insert number up to 15,000].   The Series C 
Preferred Stock shall rank senior to the Company's Series A Preferred Stock 
with respect to the payment of dividends and distributions on Liquidation and 
on parity with the Series B Preferred Stock with respect to the payment of 
dividends and distributions on Liquidation.

       2.      DEFINITIONS.  Unless the context otherwise requires, when used 
herein the following terms shall have the meaning indicated.

       "ADJUSTED STATED VALUE" with respect to each share of Series C 
Preferred Stock means the Stated Value (a) increased at an annual rate of 8% 
thereof, compounded quarterly, less (b) the amount of cash dividends actually 
paid with respect to such share, in each case commencing on the Issue Date 
and accruing through the applicable Conversion Date, or, in the case of a 
redemption being effected pursuant to SECTIONS 6(H) OR 6(I), through the date 
of payment of the redemption price.  

       "AFFILIATE" means with respect to any Person, any other Person 
directly, or indirectly through one or more intermediaries, controlling, 
controlled by or under common control with such Person.  For purposes of this 
definition, the term "control" (and correlative terms "controlling," 
"controlled 



by" and "under common control with") means possession of the power, whether 
by contract, equity ownership or otherwise, to direct the policies or 
management of a Person.

       "AVERAGE MARKET PRICE"  means, for a given security, the average 
Market Price for such security for the ten Trading Day period ending on and 
including the Trading Day prior to the date of determination; PROVIDED, 
HOWEVER, that if during such period the Company takes any action or an action 
becomes effective that would require an adjustment to the Conversion Price 
pursuant to SECTION 7 hereof, then such Average Market Price shall be 
appropriately adjusted to reflect such action in a manner consistent with the 
adjustments set forth in SECTION 7.

       "BENEFICIALLY OWN" or "BENEFICIAL OWNERSHIP" has the meaning set forth 
in Rules 13d-3 and 13d-5 of the Exchange Act.

       "BOARD" means the Board of Directors of the Company.  

       "BUSINESS COMBINATION" means (i) any consolidation or merger of the 
Company with or into any Person or (ii) any Change of Control Stock Issuance, 
or (iii) the sale, assignment conveyance, transfer, lease or other 
disposition by the Company of all or substantially all of its assets followed 
by a liquidation of the Company.

       "BUSINESS DAY" means any day except Saturday, Sunday and any day which 
shall be a legal holiday or a day on which banking institutions in Houston, 
Texas generally are authorized or required by law or other governmental 
actions to close.

       "CAPITAL STOCK" means (i) with respect to any Person that is a 
corporation, any and all shares, interests, participations or other 
equivalents (however designated) of capital or capital stock of such Person 
and (ii) with respect to any Person that is not a corporation, any and all 
partnership or other equity interests of such Person. 

       "CERTIFICATE" means the Certificate of Incorporation of the Company, 
as amended (including any certificate of designation establishing a series of 
preferred stock).

       "CERTIFICATE OF DESIGNATION" means this Certificate of Designation of 
the Series C Preferred Stock.

       "CHANGE OF CONTROL STOCK ISSUANCE" shall mean any issuance, in a 
single transaction or series of related transactions, by the Company of 
shares of Common Stock or Common Stock Equivalents in connection with the 
acquisition of assets (including cash) or securities by the Company or a 
Subsidiary of the Company (including by way of a merger of a Subsidiary of 
the Company with or into a Person),  except where (i) the shareholders of the 
Company immediately prior to such issuance own (in substantially the same 
proportion relative to each other as such shareholders owned the Common Stock 
or Voting Stock of the Company, as the case may be, immediately prior to such 
consummation) (x) more than 50% of the Voting Stock of the Company 
immediately after such issuance, and (y) more than 50% of the outstanding 
Common Stock immediately after such issuance, (ii) the members of the Board 
immediately prior to entering into the agreement relating to such issuance 
(or if no such agreement is entered into, then immediately prior to the 
consummation of such 


                                      -2-


issuance) constitute at least a majority of the Board immediately after such 
issuance, with no agreements or arrangements in place immediately after such 
consummation that would result in the members of the Board immediately prior 
to the entering into the agreement relating to such issuance ceasing to 
constitute at least a majority of the Board and (iii) no Person or Group of 
Persons immediately after such issuance is the Beneficial Owner of 40% or 
more of the total outstanding Voting Stock of the Company or Common Stock.  
In calculating the percentage of the Voting Stock of the Company owned by the 
shareholders of the Company immediately prior to an issuance of Common Stock 
or Common Stock Equivalents in which there is more than one class or series 
of Voting Stock, the percentage of the Voting Stock shall be calculated based 
on the number of votes eligible to be cast in the election of the directors 
of the Company generally.  In calculating the percentages of Voting Stock and 
Common Stock owned for purposes of this definition, such calculation shall be 
calculated on a basis assuming the exercise or conversion in full of all 
Common Stock Equivalents and on a basis disregarding all Common Stock 
Equivalents, and the percentage which results in the lower percentage owned 
by the shareholders of the Company shall apply in the application of clause 
(i) above.

       "COMMON STOCK" means the Company's common stock, par value $.01 per 
share, and any Capital Stock for or into which such Common Stock hereafter is 
exchanged, converted, reclassified or recapitalized by the Company or 
pursuant to a Business Combination to which the Company is a party.

       "COMMON STOCK EQUIVALENTS" means (without duplication with any other 
Common Stock  or Common Stock Equivalents) rights, warrants, options, 
convertible securities or exchangeable securities, exercisable for or 
convertible or exchangeable into, directly or indirectly, Common Stock, 
whether at the time of issuance or upon the passage of time or the occurrence 
of some future event.

       "COMPANY" means Input/Output, Inc. a Delaware corporation.

       "CONVERSION DATE" is defined in SECTION 6(D).

       "CONVERSION PRICE" means $____, as adjusted from time to time in 
accordance with SECTION 7. [Note - this is to be determined as set forth 
in the definition of Series C Preferred Stock in the Purchase Agreement]
       
       "CONVERSION RATIO" is defined in SECTION 6(C).

       "DGCL" means the General Corporation Law of the State of Delaware, as 
amended, or any successor statute or other legislation.

       "DIVIDEND PAYMENT DATE" is defined in SECTION 3(A).

       "DIVIDEND PERIOD" is defined in SECTION 3(A).

       "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended, 
or any successor statute, and the rules and regulations promulgated 
thereunder.


                                      -3-


       "EXCLUDED STOCK" means (i) shares of Common Stock issued by the 
Company as a stock dividend payable in shares of Common Stock, or upon any 
subdivision or split-up of the outstanding shares of Capital Stock in each 
case which is subject to SECTION 7(B), or upon conversion of shares of 
Capital Stock (but not the issuance of such Capital Stock which will be 
subject to the provisions of SECTION 7(A)(III)), (ii) shares of Common Stock 
to be issued to employees, directors, consultants and advisors of the Company 
pursuant to Stock Plans in accordance with their respective terms.

       "GROUP" means a group as contemplated by Section 13(d)(3) of the 
Exchange Act.

       "HOLDER" means a holder of record of Series C Preferred Stock.

       ["HSR ACT" means the Hart-Scott-Rodino Antitrust Improvements Act of 
1976, as amended.

       "HSR EXPIRATION DATE" shall mean the expiration or earlier termination 
of the applicable waiting period under the HSR Act relating to the 
transaction described in the filings referred to in Section 5.4 of the 
Purchase Agreement.][Delete if not applicable]

       "INITIAL CONVERSION DATE" means the first to occur of any of the 
following:  (i) _____________, 2002 [third anniversary of the Issue Date for 
the Series B Preferred Stock], (ii) an agreement providing for a Business 
Combination is approved by the Board or a Business Combination is consummated, 
(iii) a Tender Offer for Common Stock is approved or recommended by the Board 
or (iv) there is a redemption, repurchase or reacquisition by the Company of 
Rights issued pursuant to the Rights Agreement or any waiver of the application 
of the Rights Agreement to any Beneficial Owner other than Purchaser or its 
Affiliates except in the case of this clause (iv) as approved by the 
Purchaser's representative to the Board.

       "ISSUE DATE" means with respect to any shares of Series C Preferred 
Stock the original date of issuance of such shares of Series C Preferred 
Stock.

       "JUNIOR SECURITIES" means Capital Stock that, with respect to 
dividends and distributions upon Liquidation, ranks junior to the Series C 
Preferred Stock.

       "LIQUIDATION" means the voluntary or involuntary liquidation, 
dissolution or winding up of the Company; PROVIDED, HOWEVER, that a merger or 
consolidation shall not be deemed a Liquidation nor shall the sale of assets 
not requiring shareholder approval be deemed to be a Liquidation.

       "LIQUIDATION PREFERENCE" is defined in SECTION 5.

       "MANDATORY CONVERSION DATE" is defined in SECTION 6(B).

       "MARKET PRICE" means, with respect to a particular security, on any 
given day, the last reported sale price regular way or, in case no such 
reported sale takes place on such day, the average of the last closing bid 
and asked prices regular way, in either case on the principal national 
securities exchange on which the applicable security is listed or admitted to 
trading, or if not listed or admitted to trading on any national securities 
exchange, (i) the closing sale price for such day reported by the Nasdaq 
Stock Market if such security is traded over-the-counter and quoted in the 
Nasdaq Stock 


                                      -4-


Market, or (ii) if such security is so traded, but not so quoted, the average 
of the closing reported bid and asked prices of such security as reported by 
the Nasdaq Stock Market or any comparable system, or (iii) if such security 
is not listed on the Nasdaq Stock Market or any comparable system but is 
actively traded, the average of the closing bid and asked prices as furnished 
by two members of the National Association of Securities Dealers, Inc. 
selected from time to time by the Company for that purpose.  If such security 
is not listed and traded in a manner that the quotations referred to above 
are available for the period required hereunder, the Market Price shall be 
deemed to be the fair value per share of such security as determined by a 
nationally recognized investment banking firm selected by the Board and 
reasonably acceptable to the Holders of a majority of the outstanding shares 
of Series C Preferred Stock. 

       "ORDINARY CASH DIVIDENDS" means any cash dividend or distribution 
which, when combined on a per share of Common Stock basis with the per share 
amounts of all other cash dividends and distributions paid on the Common 
Stock during the 365-day period ending on the date of declaration of such 
dividend or distribution (as adjusted to appropriately reflect any of the 
events referred to in SECTION 7 and excluding cash dividends or distributions 
that resulted in an adjustment to the Conversion Price), does not exceed 5% 
of the Market Price of a share of Common Stock on the Trading Day immediately 
preceding the date of declaration of such dividend or distribution.

       "PARITY SECURITIES" means Capital Stock that, with respect to 
dividends or distributions upon Liquidation, is PARI PASSU with the Series C 
Preferred Stock.

       "PERMITTED PARITY SECURITIES" means up to 35,000 shares of Preferred 
Stock of the Company (less the number of shares of Series C Preferred Stock 
issued in accordance the Purchase Agreement) constituting no more than one 
series of Preferred Stock, each share of which (i) has a liquidation 
preference of not more than $1,000 per share exclusive of accrued and unpaid 
dividends, (ii) has a dividend rate of not more than one percent per annum, 
(iii) has no more than one vote per share with respect to matters on which it 
votes together with the Series C Preferred Stock and Series B Preferred Stock 
and other Permitted Parity Securities as a single class and (iv) is PARI 
PASSU with the Series C Preferred Stock and Series B Preferred Stock with 
respect to the payment of dividends and distributions upon Liquidation. 

       "PERSON" means an individual or a corporation, partnership, trust, 
incorporated or unincorporated association, limited liability company, joint 
venture, joint stock company, government (or an agency or political 
subdivision thereof) or other entity of any kind.

       "PRO RATA REPURCHASE" means any purchase of shares of Common Stock by 
the Company or any Affiliate thereof pursuant to any tender offer or exchange 
offer subject to Section 13(e) of the Exchange Act, or pursuant to any other 
offer available to substantially all holders of Common Stock, whether for 
cash, shares of capital stock of the Company, other securities of the 
Company, evidences of indebtedness of the Company or any other person or any 
other property (including, without limitation, shares of capital stock, other 
securities or evidences of indebtedness of a subsidiary of the Company), or 
any combination thereof; PROVIDED, HOWEVER, that "Pro Rata Repurchase" shall 
not include any purchase of shares by the Company or any Affiliate thereof 
made in accordance with the requirements of Rule 10b-18 as in effect under 
the Exchange Act.  The "effective date" of a Pro Rata Repurchase shall mean 
the date of acceptance of shares for purchase or exchange under any tender 


                                      -5-


or exchange offer which is a Pro Rata Repurchase or the date of purchase with 
respect to any Pro Rata Repurchase that is not a tender or exchange offer.

       "PURCHASE AGREEMENT" means the Purchase Agreement dated as of April 
21, 1999 between the Company and the Purchaser providing for the purchase by 
the Purchaser of 40,000 shares of Series B Preferred Stock and up to 15,000 
shares of Series C Preferred Stock from the Company, including all schedules 
and exhibits thereto.

       "PURCHASER" means SCF-IV, L.P., a Delaware limited partnership.

       "RECORD DATE" is defined in SECTION 3(A).

       "REGISTRATION RIGHTS AGREEMENT" means the Registration Rights 
Agreement dated as of May ___, 1999 between the Company and the Purchaser 
providing for certain registration rights under the Securities Act with 
respect to the Common Stock into which the Series B Preferred Stock and 
Series C Preferred Stock may be converted.

       "RIGHTS AGREEMENT"  has the meaning set forth in SECTION 6(G).

       "SECURITIES ACT" means the Securities Act of 1933, as amended, or any 
successor statute, and the rules and regulations promulgated thereunder.

       "SENIOR SECURITIES" means Capital Stock that, with respect to 
dividends or distributions upon Liquidation, ranks senior to the Series C 
Preferred Stock.

       "SERIES B PREFERRED STOCK" means the Series B Preferred Stock of the 
Company issued to Purchaser pursuant to the Purchase Agreement. 

       "STATED VALUE" is an amount equal to $1,000.00 per share of Series C 
Preferred Stock.

       "STOCK PLANS"  means the Company's stock option, stock incentive, 
restricted stock, employee stock purchase or other similar plans, in each 
case that have been approved by the Company's shareholders.

       "SUBSIDIARY" of a Person means (i) a corporation, a majority of whose 
stock with voting power, under ordinary circumstances, to elect directors is 
at the time of determination, directly or indirectly, owned by such Person or 
by one or more Subsidiaries of such Person, or (ii) any other entity (other 
than a corporation) in which such Person or one or more Subsidiaries of such 
Person, directly or indirectly, at the date of determination thereof has a 
majority ownership interest or, with respect to a limited partnership, is a 
general partner of such limited partnership.

       "TENDER OFFER" means any transaction to which Regulation 14D of the 
Exchange Act applies.

       "TRADING DAY" means a day on which the principal market with respect 
to the security in question is regularly scheduled to be open for trading, or 
if there is not such principal market, then a day on which the New York Stock 
Exchange is regularly scheduled to be open for trading.


                                      -6-


       "VOTING STOCK" of a Person means Capital Stock of such Person of the 
class or classes pursuant to which the holders thereof have the general 
voting power under ordinary circumstances to vote in the election of the 
board of directors, managers or trustees of such Person.

       The foregoing definitions will be equally applicable to both the 
singular and plural forms of the defined terms.

       3.      DIVIDENDS AND DISTRIBUTIONS.

               (A)    The holders of Series C Preferred Stock shall be entitled
       to receive out of the assets of the Company legally available for that
       purpose, cumulative preferential cash dividends at a rate per annum of
       one percent (1%) of the Stated Value (equivalent to $10 per annum or
       $2.50 per quarter) for each share of Series C Preferred Stock, and,
       except as provided in SECTION 3(B), no more, to be paid in accordance
       with the terms of this SECTION 3.  Such dividends shall be cumulative
       from the Issue Date and shall be payable in arrears, when and as
       declared by the Board, on March 31, June 30, September 30 and
       December 31 of each year (each such date being herein referred to as a
       "DIVIDEND PAYMENT DATE"), commencing on the first such Dividend Payment
       Date following the Issue Date; PROVIDED that if any Dividend Payment
       Date shall not be a Business Day, then the Dividend Payment Date shall
       be on the next succeeding day that is a Business Day.  The period from
       the Issue Date to the next Dividend Payment Date and each quarterly
       period between consecutive Dividend Payment Dates shall hereinafter be
       referred to as "DIVIDEND PERIODS."  Dividends for the initial Dividend
       Period shall be pro rated on a daily basis commencing on and including
       the Issue Date on the basis of a 360-day year.  Each such dividend shall
       be paid to the holders of record of the Series C Preferred Stock as
       their names appear on the share register of the Company on the
       corresponding Record Date.  As used above, the term "RECORD DATE" means,
       with respect to the dividend payable on March 31, June 30, September 30
       and December 31, respectively, of each year, the preceding March 15,
       June 15, September 15 and December 15, or such other record date
       designated by the Board with respect to the dividend payable on such
       respective Dividend Payment Date not exceeding 30 days preceding such
       Dividend Payment Date.  Dividends on account of arrears for any past
       Dividend Periods may be declared and paid, together with any accrued but
       unpaid interest thereon to and including the date of payment, at any
       time, without reference to any Dividend Payment Date, to holders of
       record on a date designated by the Board, not exceeding 30 days
       preceding the payment date thereof, as may be fixed by the Board.

               (B)    If, on any Dividend Payment Date, the Company fails to
       pay dividends, then until the dividends that were scheduled to be paid
       on such date are paid, such dividends shall cumulate and shall accrue
       additional dividends with respect to such unpaid dividends to and
       including the date of payment thereof at the rate of one percent (1%)
       per annum, compounded on a quarterly basis.  Dividends for any period
       less than a full quarterly Dividend Period or for a period commencing on
       a Dividend Payment Date and ending on a Conversion Date shall cumulate
       on a day-to-day basis and shall be computed on the basis of a 360-day
       year.


                                      -7-


               (C)    So long as any shares of the Series C Preferred Stock
       shall be outstanding, (i) the Company shall not declare or pay any
       dividend whatsoever, whether in cash, property or otherwise, set aside
       any cash or property for the payment of dividends, or make any other
       distribution on any Junior Securities (except a dividend or distribution
       payable solely in shares of Junior Securities), (ii) the Company shall
       not declare or pay any dividend whatsoever, whether in cash, property or
       otherwise, set aside any cash or property for the payment of dividends,
       or make any other distribution on any Parity Securities ranking on
       parity with the Series C Preferred Stock with respect to dividends or
       distributions (except a dividend or distribution payable solely in
       shares of Junior Securities), unless declared and paid PRO RATA with the
       Series C Preferred Stock in proportion to the full amount to which they
       would otherwise be respectively entitled, and (iii) the Company shall
       not and shall cause its Subsidiaries not to repurchase, redeem or
       otherwise acquire or set aside any cash or property for the repurchase
       or redemption of any Junior Securities or Parity Securities, unless in
       each such case all dividends to which the holders of the Series C
       Preferred Stock shall have been entitled for all previous Dividend
       Periods shall have been paid or declared and a sum of money sufficient
       for the payment thereof shall have been set aside.

       4.      VOTING RIGHTS.  The Holders shall have the following voting
rights with respect to the Series C Preferred Stock:

               (A)    Subject to applicable law, the shares of Series C
       Preferred Stock shall have no voting rights other than as set forth in
       this SECTION 4.

               (B)    [After the HSR Expiration Date, but only after the HSR
       Expiration Date][delete if not applicable], Holders of shares of the
       Series C Preferred Stock shall be entitled to vote upon all matters upon
       which holders of Common Stock have the right to vote, and Holders shall
       have that number of votes on all such matters as is equal to the
       Conversion Ratio that would apply if such Holder's shares of Series C
       Preferred Stock were to be converted pursuant to SECTION 6(A) (using the
       calculation of such Conversion Ratio specified in SECTION 6(C)(i) and
       not SECTION 6(C)(ii) for such purpose) as of the record date for the
       determination of the shareholders entitled to vote on such matters, or,
       if no such record date is established as of the date such vote is taken
       or any written consent of shareholders is solicited, such votes to be
       counted together with all other shares of capital stock having general
       voting powers and not separately as a class.  Fractional votes shall
       not, however, be permitted and any fractional voting rights resulting
       from the above formula (after aggregating all shares into which shares
       of Series C Preferred Stock held by each Holder could be converted)
       shall be rounded up to the nearest whole number.

               (C)    [After the HSR Expiration Date, but only after the HSR
       Expiration Date, the Holders of the Series C Preferred Stock][delete if
       not applicable], voting together with the Series B Preferred Stock and
       any Permitted Parity Securities as a separate class with one vote per
       share of Series C Preferred Stock, shall be entitled to elect one member
       of the Board at each meeting or pursuant to each consent of the
       Company's shareholders for the election of directors (unless the term of
       the director previously elected by the Holders pursuant to this Section
       4(C) would continue after such election).  If the director so elected by
       the Holders shall cease to serve as director before his term shall
       expire, the Holders may, at a special 


                                      -8-


       meeting of such Holders, elect a successor to hold office for the 
       unexpired term of such director.  The Secretary of the Company may 
       call, and upon written request of the Holders of ten percent (10%) or 
       more of the outstanding Series C Preferred Stock addressed to him at 
       the principal office of the Company shall call, such a special meeting 
       of the Holders for the election of such director as provided herein.  
       Such meeting shall be held within fifty (50) days after delivery of 
       such request to such Secretary, at the place and upon the notice 
       provided by law and in the Bylaws of the Company for the holding of 
       meetings of its shareholders.  Any director who shall have been 
       elected pursuant to this SECTION 4(C), may be removed during the 
       aforesaid term of office, with or without cause, only by the 
       affirmative vote of a majority votes entitled to be cast by the 
       Holders of Series C Preferred Stock, the Series B Preferred Stock and 
       the holders of then outstanding Permitted Parity Securities.

               (D)    (i)     The consent of the Holders of at least a majority
       of the Series C Preferred Stock, voting together with the Series B
       Preferred Stock and the Permitted Parity Securities as a single class
       with one vote per share, in person or by proxy, either in writing
       without a meeting or at an annual or a special meeting of shareholders
       called for the purpose, shall be necessary to:

                              (A)    amend, alter or repeal, by way of merger
                      or otherwise, any of the provisions of the Certificate,
                      so as to authorize, create or issue any shares of Parity
                      Securities (other than Permitted Parity Securities) or
                      Senior Securities (or amend the provisions of any
                      existing class of Capital Stock to make such class of
                      Capital Stock a class of Parity Securities or Senior
                      Securities), 

                              (B)    issue any Parity Securities (other than
                              Permitted Parity Securities) or Senior Securities,
                              or

                              (C)    consummate any Business Combination. 

                      (ii)    The consent of the Holders of at least a majority
               of the Series C Preferred Stock, voting separately as a single
               class with one vote per share, in person or by proxy, either in
               writing without a meeting or at an annual or a special meeting of
               shareholders called for the purpose, shall be necessary to amend,
               alter or repeal, by way of merger or otherwise, any of the
               provisions of (x) the Certificate of Designation or any
               certificate of designation of terms of any Parity Securities, or
               (y) the Certificate, so as to affect adversely any of the rights,
               preferences or privileges of Holders.  

       5.      LIQUIDATION PREFERENCE.  In the event of any Liquidation, 
after payment or provision for payment by the Company of the debts and other 
liabilities of the Company and the liquidation preference of any Senior 
Securities that rank senior to the Series C Preferred Stock with respect to 
distributions on Liquidation, each Holder shall be entitled to receive an 
amount in cash for each share of the then outstanding Series C Preferred 
Stock held by such Holder equal to the Stated Value per share, plus an amount 
equal to all accrued but unpaid dividends thereon, whether or not earnings 
are available in respect of such dividends or such dividends have been 
declared, to and including the date 


                                      -9-


full payment is tendered to the Holders with respect to such Liquidation, and 
no more (such amount being referred to herein as the "LIQUIDATION 
PREFERENCE"), before any distribution shall be made to the holders of any 
Junior Securities upon the Liquidation of the Company.  In case the assets of 
the Company available for payment to the Holders upon a Liquidation are 
insufficient to pay the full Liquidation Preference on all outstanding shares 
of the Series C Preferred Stock and all outstanding Senior Securities or 
Parity Securities, in each case ranking on parity with the Series C Preferred 
Stock as to distributions on Liquidation, in the amounts to which the holders 
of such shares are entitled, then the entire assets of the Company available 
for payment to the Holders of Series C Preferred Stock and holders of such 
Senior Securities or Parity Securities will be distributed ratably among the 
Holders of the Series C Preferred Stock and the holders of such Senior 
Securities or Parity Securities, based upon the aggregate amount due on such 
shares upon Liquidation. Written notice of any Liquidation of the Company, 
stating a payment date and the place where the distributable amounts shall be 
payable, shall be given by mail, postage prepaid, not less than 30 days prior 
to the payment date stated therein, to the Holders of record of the Series C 
Preferred Stock at their respective addresses as the same shall appear on the 
books of the Company.

       6.      CONVERSION RIGHTS.  The Series C Preferred Stock shall be 
convertible as follows:

               (A)    CONVERSION AT HOLDER'S OPTION.  The Holder of any shares
       of Series C Preferred Stock shall have the right at such Holder's
       option, at any time after the Initial Conversion Date and prior to the
       Mandatory Conversion Date and without the payment of any additional
       consideration, to convert any or all of such shares of Series C
       Preferred Stock into a number of fully paid and nonassessable shares of
       Common Stock for each such share of Series C Preferred Stock equal to
       the Conversion Ratio, upon the terms hereinafter set forth.  

               (B)    MANDATORY CONVERSION.   On _______________, 2004 [insert
       fifth anniversary of the Issue Date for the Series B Preferred Stock]
       (the "MANDATORY CONVERSION DATE"), each outstanding share of Series C
       Preferred Stock shall, without any action on the part of the Holder of
       such share, be converted automatically into a number of fully paid and
       nonassessable shares of Common Stock equal to the Conversion Ratio, upon
       the terms hereinafter set forth; PROVIDED, HOWEVER, that if the shares
       of Common Stock issuable upon conversion of the Series C Preferred Stock
       are not immediately freely transferrable under the Securities Act by the
       Holders thereof, the Mandatory Conversion Date shall be delayed until
       such time as the resale of the Common Stock issuable upon conversion of
       such Series C Preferred Stock has been registered under the Securities
       Act in accordance with the terms of the Registration Rights Agreement.

               (C)    CONVERSION RATIO.  In the event of a conversion pursuant
       to SECTION 6(A) OR 6(B), the Conversion Ratio shall be a number of
       shares of Common Stock calculated using either of the following methods
       at the option of the Holder as may be specified by the Holder at the
       time of conversion, or, if no such specification is made, using the
       method that results in the highest number:


                                      -10-



                      (i)   the amount determined by dividing (a) the Stated
               Value plus any accrued and unpaid dividends to and including the
               applicable Conversion Date by (b) the Conversion Price in effect
               on the applicable Conversion Date; or 

                      (ii)  the amount determined by dividing (a) the Adjusted
               Stated Value as of the applicable Conversion Date by (b) the
               Average Market Price determined as of the applicable Conversion
               Date (but not less than the lesser of $.01 or the par value per
               share of the Common Stock at the time of conversion). 

               (D)    MECHANICS OF CONVERSION.  The Holder of any shares of
       Series C Preferred Stock may exercise the conversion right specified in
       SECTION 6(A) by surrendering to the Company or any transfer agent of the
       Company the certificate or certificates representing the shares of
       Series C Preferred Stock to be converted, accompanied by written notice
       specifying the number of such shares to be converted.  If the
       certificates representing shares of Common Stock issuable upon
       conversion of shares of Series C Preferred Stock are to be issued in a
       name other than the name on the face of the certificates representing
       such shares of Series C Preferred Stock, such certificates shall be
       accompanied by such evidence of the assignment and such evidence of the
       signatory's authority with respect thereto as deemed appropriate by the
       Company or its transfer agent.  Conversion shall be deemed to have been
       effected (i) with respect to conversions pursuant to SECTION 6(A), on
       the date when the notice of an election to convert pursuant to
       SECTION 6(A) and  certificates representing the shares being converted
       are actually received by the Company or any transfer agent of the
       Company, or (ii) with respect to mandatory conversion pursuant to
       SECTION 6(B), on the Mandatory Conversion Date.  Such dates that the
       conversion shall be deemed to be effective shall be referred to herein
       as the "CONVERSION DATE."  Subject to the provisions of SECTION 7(G), as
       promptly as practicable after the Conversion Date, the Company shall
       issue and deliver to or upon the written order of such Holder a
       certificate or certificates for the number of shares of Common Stock to
       which such Holder is entitled upon such conversion and a check or cash
       with respect to any fractional interest in a share of Common Stock, as
       provided in SECTION 6(E).  The person in whose name the certificate or
       certificates for shares of Common Stock are to be issued shall be deemed
       to have become a holder of record of such shares of Common Stock on the
       applicable Conversion Date.  Upon conversion of only a portion of the
       shares covered by a certificate representing shares of Series C
       Preferred Stock surrendered for conversion pursuant to SECTION 6(A), the
       Company shall issue and deliver to or upon the written order of the
       Holder of the certificate so surrendered for conversion, at the expense
       of the Company, a new certificate representing the number of shares of
       Series C Preferred Stock representing the unconverted portion of the
       certificate so surrendered.

               (E)    FRACTIONAL SHARES.  No fractional shares of Common Stock
       or scrip shall be issued upon conversion of shares of Series C Preferred
       Stock.  If more than one share of Series C Preferred Stock shall be
       surrendered for conversion at any one time by the same Holder, the
       number of shares of Common Stock issuable upon conversion thereof shall
       be computed on the basis of the aggregate number of shares of Series C
       Preferred Stock so surrendered.  Instead of any fractional share of
       Common Stock which would otherwise be issuable upon conversion of any
       shares of Series C Preferred Stock, the Company shall pay 


                                      -11-


       a cash adjustment in respect of such fractional interest in an amount 
       equal to that fractional interest of the Market Price of the Common 
       Stock on the Conversion Date.

               (F)    AUTHORIZATION AND ISSUANCE.  The Company covenants and
       agrees that:

                      (i)     the shares of Common Stock issuable upon any
               conversion of any shares of Series C Preferred Stock will be
               deemed to have been issued to the Person exercising such
               conversion rights set forth herein on the Conversion Date, and
               the Person exercising such conversion rights will be deemed for
               all purposes to have become the record holder of such shares of
               Common Stock on the Conversion Date;

                      (ii)    all shares of Common Stock which may be issued
               upon any conversion of any Series C Preferred Stock will, upon
               issuance, be fully paid and non-assessable and free from all
               taxes, liens and charges with respect to the issue thereof;

                      (iii)   the Company will take all such action as may be
               necessary to assure that all shares of Common Stock issuable upon
               conversion of shares of Series C Preferred Stock may be issued
               without violation of any applicable law or regulation or of any
               requirements of any domestic securities exchange upon which
               securities of the same class may be listed and shall endeavor to
               list the shares of Common Stock required to be delivered upon
               conversion of the shares of Series C Preferred Stock, prior to
               such delivery, upon each national securities exchange, if any,
               upon which the outstanding Common Stock is listed at the time of
               such delivery; 

                      (iv)    the Company will not take any action which would
               result in any adjustment of the Conversion Price if the total
               number of shares of Common Stock issuable after such action upon
               conversion of all shares of Series C Preferred Stock, together
               with all shares of Common Stock then outstanding and all shares
               of Common Stock then issuable upon the exercise of all
               outstanding Common Stock Equivalents, would exceed the total
               number of shares of Common Stock then authorized by the
               Certificate of Incorporation; 

                      (v)     the Company will at all times reserve and keep
               available, out of its authorized but unissued shares of Common
               Stock or out of shares of Common Stock held in its treasury, the
               full number of shares of Common Stock into which all shares of
               the Series C Preferred Stock having conversion privileges from
               time to time outstanding are convertible; and 

                      (vi)    the Company will at no time close its transfer
               books against the transfer of the Series C Preferred Stock or of
               any share of Common Stock issued or issuable upon the conversion
               of the Series C Preferred Stock in any manner which interferes
               with the timely conversion of the Series C Preferred Stock.

               (G)    RIGHTS.  Whenever the Company issues shares of Common
       Stock upon conversion of Series C Preferred Stock, the Company will
       issue, together with each such share of Common Stock, one right to
       purchase Series A Preferred Stock of the Company (or 


                                      -12-


       other securities in lieu thereof) pursuant to the Rights Agreement 
       dated as of January 17, 1997 by and between the Company and Harris 
       Trust and Savings Bank, as amended (the "RIGHTS AGREEMENT"), or any 
       similar rights, if any, issued to holders of Common Stock in addition 
       thereto or in the replacement therefor (such rights, together with any 
       additional or replacement rights, being collectively referred to as 
       the "RIGHTS"), whether or not such rights shall be exercisable at such 
       time, but only if such Rights are issued and outstanding and held by 
       other holders of Common Stock (or are evidenced by outstanding share 
       certificates representing Common Stock) at such time and have not 
       expired or been redeemed.

               (H)    CASH REDEMPTION OPTION.  Notwithstanding the provisions
       of SECTIONS 6(A) OR 6(B), in the event of a conversion of Series C
       Preferred Stock pursuant to which the Conversion Ratio is determined
       using SECTION 6(C)(ii) (rather than SECTION 6(C)(i)), then, provided
       that full cumulative dividends shall have been paid or declared and set
       apart for payment upon all outstanding shares of Series C Preferred
       Stock for all past dividend periods, the Company may offer to redeem for
       cash any or all of such shares of Series C Preferred Stock at a
       redemption price per share equal to the Adjusted Stated Value (a
       "REDEMPTION OFFER"),  in lieu of effecting such conversion.  To effect a
       Redemption Offer, the Company must give notice of such election,
       specifying the redemption price, (a "REDEMPTION OFFER NOTICE") to the
       Holder of such shares of Series C Preferred Stock (i) with respect to
       conversions pursuant to SECTION 6(A), within three Business Days after
       the notice of an election to convert pursuant to SECTION 6(A) is
       received by the Company or any transfer agent of the Company, or
       (ii) with respect to mandatory conversion pursuant to SECTION 6(B), on
       the Mandatory Conversion Date.  If the Company fails to give a
       Redemption Offer Notice within the foregoing time periods, it may not
       make a Redemption Offer.  If the Company has given a Redemption Offer
       Notice with respect to more than 50% of the shares of Series C Preferred
       Stock to be converted, then within three Business Days following receipt
       of a Redemption Offer Notice, the Holder may give notice to the Company
       declining the Company's offer to redeem up to 50% of the shares of
       Series C Preferred Stock to be converted, in which event the Company
       will not be entitled to redeem such shares as specified and must convert
       such shares into Common Stock in accordance with the terms hereof
       effective as of the Conversion Date.  The Company shall be entitled to
       redeem all of the shares subject to the Redemption Offer Notice at the
       redemption price set forth above to the extent the Holder does not
       properly decline such redemption in accordance with the prior sentence.
       The Company shall make any such redemption payment by wire transfer to
       an account specified by the Holder on the first Business Day following
       the expiration of the three Business Day period after the Holder's
       receipt of the Redemption Offer Notice, failing which payment the
       Company shall not be entitled to redeem such shares but shall be
       obligated to convert all of such Shares into Common Stock in accordance
       with the terms hereof.

               (I)    LIMITATION ON NUMBER OF CONVERSION SHARES. 
       Notwithstanding the provisions of SECTIONS 6(A) OR 6(B), if the Company
       ever issues Common Stock upon conversion of Series C Preferred Stock
       pursuant to which the Conversion Ratio is calculated pursuant to SECTION
       6(C)(ii) rather than SECTION 6(C)(i), the Company shall not be obligated
       to issue, in the aggregate, a number of shares of Common Stock in excess
       of the NYSE Limitation upon conversion of the Series C Preferred Stock. 
       The "NYSE Limitation" shall mean the maximum number of shares of Common
       Stock that could be issued by the Company pursuant to the 


                                      -13-


       conversion of the Series B Preferred Stock, the Series C Preferred 
       Stock and any substantially similar series of Permitted Parity 
       Securities issued to the Holder pursuant to the terms of the Purchase 
       Agreement without triggering a requirement to obtain the approval of 
       the Company's shareholders of such issuance pursuant to Section 
       312.03(c) of the New York Stock Exchange Listed Company Manual as in 
       effect on the Issue Date.  To the extent that any shares of Series C 
       Preferred Stock are submitted for conversion such that the NYSE 
       Limitation would be exceeded, such excess shares shall, in lieu of 
       being converted into Common Stock, be redeemed in exchange for a cash 
       payment equal to the Adjusted Stated Value per share.   The Company 
       shall make any such redemption payment by wire transfer to an account 
       specified by the Holder on the second Business Day following the 
       Conversion Date on which the shares of Series C Preferred Stock would 
       otherwise be converted into Common Stock.

       7.      CONVERSION PRICE ADJUSTMENTS.  The Conversion Price shall be
subject to adjustment from time to time as follows:

               (A)    COMMON STOCK ISSUED AT LESS THAN MARKET PRICE OR
       CONVERSION PRICE.  If the Company issues or sells any Common Stock other
       than Excluded Stock without consideration or for a consideration per
       share less than the Market Price per share of Common Stock, on the
       Trading Day immediately preceding such issuance or sale or less than the
       Conversion Price in effect immediately prior to such issuance or sale,
       the Conversion Price in effect immediately prior to each such issuance
       or sale will immediately (except as provided below) be reduced to the
       price determined by multiplying the Conversion Price in effect
       immediately prior to such issuance or sale, by a fraction, (1) the
       numerator of which shall be (i) the number of shares of Common Stock
       outstanding immediately prior to such issuance or sale plus (ii) the
       number of shares of Common Stock which the aggregate consideration
       received by the Company for the total number of such additional shares
       of Common Stock so issued or sold would purchase at the higher of (x)
       the Market Price per share of Common Stock on the Trading Day
       immediately preceding such issuance or sale and (y) the Conversion Price
       in effect immediately prior to such issuance or sale and (2) the
       denominator of which shall be the number of shares of Common Stock
       outstanding immediately after such issue or sale.  For the purposes of
       any adjustment of the Conversion Price pursuant to this SECTION 7(A),
       the following provisions shall be applicable:

                      (i)     in the case of the issuance of Common Stock for
               cash, the amount of the consideration received by the Company
               shall be deemed to be the amount of the cash proceeds received by
               the Company for such Common Stock before deducting therefrom any
               discounts or commissions allowed, paid or incurred by the Company
               for any underwriting or otherwise in connection with the issuance
               and sale thereof;

                      (ii)    in the case of the issuance of Common Stock
               (otherwise than upon the conversion of shares of Capital Stock or
               other securities of the Company) for a consideration in whole or
               in part other than cash, including securities acquired in
               exchange therefor (other than securities by their terms so
               exchangeable), the consideration other than cash shall be deemed
               to be the fair value thereof as reasonably determined by the
               Board, irrespective of any accounting treatment; 


                                      -14-


               PROVIDED, HOWEVER, that such fair value as determined by the 
               Board shall not exceed the aggregate Market Price of the shares 
               of Common Stock being issued as of the date the Board authorizes 
               the issuance of such shares;

                      (iii)   in the case of the issuance of (a) options,
               warrants or other rights to purchase or acquire Common Stock
               (whether or not at the time exercisable), (b) securities by their
               terms convertible into or exchangeable for Common Stock (whether
               or not at the time so convertible or exchangeable) or options,
               warrants or rights to purchase such convertible or exchangeable
               securities (whether or not at the time exercisable):

                              (1)    the aggregate maximum number of shares of
                                     Common Stock deliverable upon exercise of
                                     such options, warrants or other rights to
                                     purchase or acquire Common Stock shall be
                                     deemed to have been issued at the time
                                     such options, warrants or rights are
                                     issued and for a consideration equal to
                                     the consideration (determined in the
                                     manner provided in SECTION 7(A)(i) AND
                                     (ii)), if any, received by the Company
                                     upon the issuance of such options,
                                     warrants or rights plus the minimum
                                     purchase price provided in such options,
                                     warrants or rights for the Common Stock
                                     covered thereby;

                              (2)    the aggregate maximum number of shares of
                                     Common Stock deliverable upon conversion
                                     of or in exchange for any such convertible
                                     or exchangeable securities, or upon the
                                     exercise of options, warrants or other
                                     rights to purchase or acquire such
                                     convertible or exchangeable securities and
                                     the subsequent conversion or exchange
                                     thereof, shall be deemed to have been
                                     issued at the time such securities were
                                     issued or such options, warrants or rights
                                     were issued and for a consideration equal
                                     to the consideration, if any, received by
                                     the Company for any such securities and
                                     related options, warrants or rights
                                     (excluding any cash received on account of
                                     accrued interest or accrued dividends),
                                     plus the additional consideration
                                     (determined in the manner provided in
                                     SECTION 7(A)(i) AND (ii)), if any, to be
                                     received by the Company upon the
                                     conversion or exchange of such securities,
                                     or upon the exercise of any related
                                     options, warrants or rights to purchase or
                                     acquire such convertible or exchangeable
                                     securities and the subsequent conversion
                                     or exchange thereof;

                              (3)    on any change in the number of shares of
                                     Common Stock deliverable upon exercise of
                                     any such options, warrants or rights or
                                     conversion or exchange of such convertible
                                     or exchangeable securities or any change
                                     in the consideration to be received by the
                                     Company upon such exercise, conversion 


                                      -15-


                                     or exchange, but excluding changes 
                                     resulting from the anti-dilution provisions
                                     thereof (to the extent comparable to the
                                     anti-dilution provisions contained
                                     herein), the Conversion Price as then in
                                     effect shall forthwith be readjusted to
                                     such Conversion Price as would have been
                                     obtained had an adjustment been made upon
                                     the issuance of such options, warrants or
                                     rights not exercised prior to such change,
                                     or of such convertible or exchangeable
                                     securities not converted or exchanged
                                     prior to such change, upon the basis of
                                     such change;

                              (4)    on the expiration or cancellation of any
                                     such options, warrants or rights (without
                                     exercise), or the termination of the right
                                     to convert or exchange such convertible or
                                     exchangeable securities (without
                                     exercise), if the Conversion Price shall
                                     have been adjusted upon the issuance
                                     thereof, the Conversion Price shall
                                     forthwith be readjusted to such Conversion
                                     Price as would have been obtained had an
                                     adjustment been made upon the issuance of
                                     such options, warrants, rights or such
                                     convertible or exchangeable securities on
                                     the basis of the issuance of only the
                                     number of shares of Common Stock actually
                                     issued upon the exercise of such options,
                                     warrants or rights, or upon the conversion
                                     or exchange of such convertible or
                                     exchangeable securities; and

                              (5)    if the Conversion Price shall have been
                                     adjusted upon the issuance of any such
                                     options, warrants, rights or convertible
                                     or exchangeable securities, no further
                                     adjustment of the Conversion Price shall
                                     be made for the actual issuance of Common
                                     Stock upon the exercise, conversion or
                                     exchange thereof; 

               PROVIDED, HOWEVER, that no increase in the Conversion Price shall
               be made pursuant to subclauses (1) or (2) of this SECTION
               7(A)(iii).

               (B)    STOCK SPLITS, SUBDIVISIONS, RECLASSIFICATIONS OR
       COMBINATIONS.  If the Company shall (1) declare a dividend or make a
       distribution on its Common Stock in shares of Common Stock, (2)
       subdivide or reclassify the outstanding shares of Common Stock into a
       greater number of shares, or (3) combine or reclassify the outstanding
       Common Stock into a smaller number of shares, the Conversion Price in
       effect at the time of the record date for such dividend or distribution
       or the effective date of such subdivision, combination or
       reclassification shall be proportionately adjusted so that the Holder of
       any shares of Series C Preferred Stock surrendered for conversion or
       exchange after such date shall be entitled to receive the number of
       shares of Common Stock which such holder would have owned or been
       entitled to receive after such date had such Series C Preferred Stock
       been converted or 


                                      -16-


       exchanged immediately prior to such date. Successive
       adjustments in the Conversion Price shall be made whenever any event
       specified above shall occur.

               (C)    OTHER DISTRIBUTIONS.  In case the Company shall fix a
       record date for the making of a distribution to all holders of shares of
       its Common Stock (1) of shares of any class other than its Common Stock
       or (2) of evidence of indebtedness of the Company or any Subsidiary or
       (3) of assets (including cash but excluding Ordinary Cash Dividends, and
       dividends or distributions referred to in SECTION 7(B)), or (4) of
       rights or warrants, then in each such case the Conversion Price in
       effect immediately prior thereto shall be reduced to the price
       determined by multiplying the Conversion Price in effect immediately
       prior to such record date by a fraction, (i) the numerator of which
       shall be an amount equal to the difference resulting from (A) the number
       of shares of Common Stock outstanding on such record date multiplied by
       the Market Price per share of Common Stock on such record date, less (B)
       the fair market value (as reasonably determined by the Board) of said
       shares or evidences of indebtedness or assets or rights or warrants to
       be so distributed, and (ii) the denominator of which shall be equal to
       the number of shares of Common Stock outstanding on such record date
       multiplied by the Market Price per share of Common Stock on such record
       date.  Such adjustment shall be made successively whenever such a record
       date is fixed. In the event that such distribution is not so made, the
       Conversion Price then in effect shall be readjusted, effective as of the
       date when the Board determines not to distribute such shares, evidences
       of indebtedness, assets, rights or warrants, as the case may be, to the
       Conversion Price that would then be in effect if such record date had
       not been fixed.

               (D)    CERTAIN REPURCHASES OF COMMON STOCK.  In case the Company
       effects a Pro Rata Repurchase of Common Stock, then the Conversion Price
       shall be reduced to the price determined by multiplying the Conversion
       Price in effect immediately prior to the effective date of such Pro Rata
       Repurchase by a fraction of which (1) the numerator shall be (i) the
       product of (x) the number of shares of Common Stock outstanding
       immediately before such Pro Rata Repurchase and (y) the Market Price per
       share of Common Stock on the Trading Day immediately preceding the first
       public announcement of the intent to effect such Pro Rata Repurchase,
       minus (ii) the aggregate purchase price of the Pro Rata Repurchase, and
       of which (2) the denominator shall be the product of (a) the number of
       shares of Common Stock outstanding immediately prior to such Pro Rata
       Repurchase minus the number of shares of Common Stock so repurchased and
       (b) the Market Price per share of Common Stock on the Trading Day
       immediately preceding the first public announcement of such Pro Rata
       Repurchase.

               (E)    BUSINESS COMBINATIONS.  In case of any Business
       Combination in which the holders of shares of Common Stock are entitled
       to receive stock, securities or property by virtue of their ownership of
       Common Stock or a reclassification of Common Stock (other than a
       reclassification of Common Stock referred to in SECTION 7(B)), each
       share of Series C Preferred Stock shall after the date of such Business
       Combination or reclassification be convertible into the number of shares
       of stock or other securities or property (including cash) to which the
       Common Stock issuable upon conversion of such share of Series C
       Preferred Stock immediately prior to such Business Combination or
       reclassification would have been entitled upon such Business Combination
       or reclassification; and in any such case, if 


                                      -17-


       necessary, the provisions set forth herein with respect to the rights 
       and interests thereafter of the Holders of the shares of Series C 
       Preferred Stock shall be appropriately adjusted so as to be 
       applicable, as nearly as may reasonably be, to any shares of stock or 
       other securities or property thereafter deliverable on the conversion 
       of the shares of Series C Preferred Stock.  In determining the kind 
       and amount of stock, securities or the property receivable upon 
       consummation of such Business Combination, if the holders of Common 
       Stock have the right to elect the kind or amount of consideration 
       receivable upon consummation of such Business Combination, then the 
       Holder of the Series C Preferred Stock shall have the right to make a 
       similar election as of the Conversion Date with respect to the number 
       of shares of stock or other securities or property into which the 
       Series C Preferred Stock shall be convertible.

               (F)    ROUNDING OF CALCULATIONS; MINIMUM ADJUSTMENTS.  All
       calculations under this SECTION 7 shall be made to the nearest one tenth
       (1/10th) of a cent or to the nearest one hundredth (1/100th) of a share,
       as the case may be. Any provision of this SECTION 7 to the contrary
       notwithstanding, no adjustment in the Conversion Price shall be made if
       the amount of such adjustment would be less than $0.01, but any such
       amount shall be carried forward and an adjustment with respect thereto
       shall be made at the time of and together with any subsequent adjustment
       which, together with such amount and any other amount or amounts so
       carried forward, shall aggregate $0.01 or more.  In addition, in no
       event shall be Conversion Price be adjusted to less than the lesser of
       $.01 per share or the par value of the Common Stock.  

               (G)    TIMING OF ISSUANCE OF ADDITIONAL COMMON STOCK UPON
       CERTAIN ADJUSTMENTS. In any case in which the provisions of this SECTION
       7 shall require that an adjustment shall become effective immediately
       after a record date for an event, the Company may defer until the
       occurrence of such event (1) issuing to the Holder of any share of
       Series C Preferred Stock converted after such record date and before the
       occurrence of such event the additional shares of Common Stock issuable
       upon such conversion by reason of the adjustment required by such event
       over and above the shares of Common Stock issuable upon such conversion
       before giving effect to such adjustment and (B) paying to such Holder
       any amount of cash in lieu of a fractional share of such Common Stock;
       PROVIDED, HOWEVER, that the Company upon request shall deliver to such
       Holder a due bill or other appropriate instrument evidencing such
       Holder's right to receive such additional shares, and such cash, upon
       the occurrence of the event requiring such adjustment.

               (H)    STATEMENT REGARDING ADJUSTMENTS. Whenever the Conversion
       Price shall be adjusted as provided in SECTION 7 the Company shall
       forthwith file, at the office of any transfer agent for the Series C
       Preferred Stock and at the principal office of the Company  a statement
       showing in reasonable detail the facts requiring such adjustment and the
       Conversion Price that shall be in effect after such adjustment and the
       Company shall also cause a copy of such statement to be sent by mail,
       first class postage prepaid, to each Holder at its address appearing in
       the Company's records.  

               (I)    NOTICES.  In the event that the Company shall propose to
       take any action of the type described in SECTION 7 (but only if the
       action of the type described in SECTION 7 would result in an adjustment
       in the Conversion Price or a change in the type of securities or


                                      -18-


       property to be delivered upon a conversion or exchange of Series C
       Preferred Stock), the Company shall give notice to each Holder, in the
       manner set forth in SECTION 7(H), which notice shall specify the record
       date, if any, with respect to any such action and the approximate date
       on which such action is to take place.  Such notice shall also set forth
       the facts with respect thereto as shall be reasonably necessary to
       indicate the effect on the Conversion Price and the number, kind or
       class of shares or other securities or property which shall be
       deliverable upon conversion of shares of the Series C Preferred Stock. 
       In the case of any action which would require the fixing or a record
       date, such notice shall be given at least 10 days prior to the date so
       fixed, and in case of all other action, such notice shall be given at
       least 15 days prior to the taking of such proposed action.  Failure to
       give such notice, or any defect therein, shall not affect the legality
       or validity of any such action.

               (J)    NO IMPAIRMENT.  The Company will not, by amendment of its
       Certificate of Incorporation or through any reorganization, transfer of
       assets, consolidation, merger, dissolution, issue or sale of securities
       or any other voluntary action, avoid or seek to avoid the observance or
       performance of any of the terms to be observed or performed hereunder by
       the Company, but will at all times in good faith assist in the carrying
       out of all the provisions of SECTIONS 6 and 7 and in taking of all such
       action as may be necessary or appropriate in order to protect the
       conversion rights of the Holders of the Series C Preferred Stock against
       impairment. 

               (K)    NO DUPLICATION OF ADJUSTMENTS.  If any action would
       require adjustment of the Conversion Price pursuant to more than one of
       the provisions of this SECTION 7, only one adjustment shall be made and
       such adjustment shall be the adjustment that results in the lowest
       Conversion Price after giving effect to such adjustment. 

       8.      LIMITATIONS ON SERIES C PREFERRED STOCK. No share or shares of 
Series C Preferred Stock the Company acquires through redemption, option, 
exchange or otherwise will be reissued as Series C Preferred Stock, and all 
such shares will be canceled, retired and eliminated from the shares of 
Series C Preferred Stock which the Company will be authorized to issue, and 
will be restored to the status of authorized but undesignated preferred stock 
of the Company eligible for designation and reissuance subject to the terms 
hereof and the Certificate.  The Company will not issue any further shares of 
Series C Preferred Stock.  

       9.      WAIVERS.  With the written consent of Holders of a Majority of 
the Series C Preferred Stock, the obligations of the Company and the rights 
of the Holders under this Certificate of Designation may be waived (either 
generally or in a particular instance, either retroactively or prospectively 
and either for a specified period of time or indefinitely).  Upon the 
effectuation of each such waiver, the Company will promptly give written 
notice thereof to the Holders who have not previously consented thereto in 
writing.

       10.     REDEMPTION.  Except as expressly set forth herein, the Company 
shall have no right or obligation to redeem the Series C Preferred Stock.

                     REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.
                                          


                                      -19-


       IN WITNESS WHEREOF, this Certificate has been signed on behalf of the 
Company by its President and attested to by its Secretary, all as of the 
_____ day of _________, 1999.

                                        INPUT/OUTPUT, INC.


                                        By:                      
                                            ----------------------------
                                              President

ATTEST:


By:                      
   -------------------------
     Secretary


                                      -20-