INPUT OUTPUT INC
8-K, 1999-05-07
MEASURING & CONTROLLING DEVICES, NEC
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<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


                         Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934


     Date of Report (Date of earliest event reported):   APRIL 21, 1999
                                                       -----------------

                               INPUT/OUTPUT, INC.
                               ------------------
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                                    --------
                 (State or other jurisdiction of incorporation)

            1-13402                                         22-2286646          
- ---------------------------------              ---------------------------------
   (Commission File Number)                    (IRS Employer Identification No.)

         11104 WEST AIRPORT BLVD., STAFFORD, TEXAS          77477
- --------------------------------------------------------------------------------
         (Address of principal executive offices)        (Zip Code)

      Registrant's telephone number, including area code   (281) 933-3339
                                                          ----------------------

                                 NOT APPLICABLE
- --------------------------------------------------------------------------------
          (Former name or former address, if changed since last report)

<PAGE>

ITEM 5.  OTHER EVENTS.

         On April 21, 1999, SCF-IV, L.P., a limited partnership organized 
under the laws of the State of Delaware ("SCF-IV"), and Input/Output, Inc., a 
Delaware corporation (the "Company") entered into a Purchase Agreement (the 
"Purchase Agreement") pursuant to which SCF-IV agreed to purchase, in a 
privately negotiated transaction, from the Company 40,000 shares of Series B 
preferred stock, par value $0.01 per share (the "Series B Preferred Stock" or 
the "Initial Shares"), of the Company, and the Company granted to SCF-IV an 
option to purchase up to 15,000 additional shares of Series C preferred 
stock, par value $0.01 per share (the "Series C Preferred Stock" or the 
"Option Shares," and together with the Series B Preferred Stock, the 
"Shares"), of the Company. SCF-IV purchased the Initial Shares on May 7, 1999 
(the "Initial Closing Date"). The consideration paid by SCF-IV for the 
Initial Shares was $40,000,000. The net cash proceeds will be used to fund 
the Company's research and development projects, to provide additional 
working capital and for general corporate purposes.

         For a period of ninety days after the Initial Closing Date (the 
"Option Period"), SCF-IV may, at its sole option, purchase up to 15,000 
shares of the Series C Preferred Stock (the "Exercise Notice") under the 
option granted under the Purchase Agreement. The purchase price payable for 
the Option Shares will be $1,000 per share (or an aggregate maximum of 
$15,000,000).

THE PURCHASE AGREEMENT

         Pursuant to the Purchase Agreement, the Company has agreed to use 
its best efforts to take, or cause to be taken, such action as may be 
necessary or advisable to ensure that immediately following the later of (i) 
the Initial Closing Date and (ii) the expiration or termination of the 
applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements 
Act of 1976, as amended (the "HSR Act"), the Company's Board of Directors 
will be increased by one (if necessary) and an individual designated by 
SCF-IV will be elected as a director of the Company in accordance with the 
terms of the Shares as described below.

         In connection with the Purchase Agreement, the Company has amended 
its Rights Agreement with Harris Trust and Savings Bank as rights agent dated 
as of January 17, 1997 (the "Rights Plan"), to provide that neither SCF-IV 
nor any of its affiliates will be deemed to be an "Acquiring Person" within 
the meaning of the Rights Plan by reason of the transactions contemplated by 
the Purchase Agreement. The Company has agreed in the Purchase Agreement that 
it will not further amend the Rights Plan, or adopt any similar agreement, 
that conflicts with, or restricts SCF-IV to a greater extent than the 
provisions contained in the Purchase Agreement. In addition, the Board of 
Directors of the Company has approved SCF-IV and its affiliates becoming an 
"interested stockholder" within the meaning of Section 203 of the Delaware 
General Corporation Law (the "DGCL") and a "Related Person" within the 
meaning of Article THIRTEENTH of the Company's Certificate of Incorporation 
by reason of the acquisition by SCF-IV or any of its affiliates of (i) the 
Shares, (ii) any shares issued to SCF-IV upon conversion of the Shares (the 
"Underlying Shares"), (iii) any shares of Common Stock permitted to be 
acquired by SCF-IV or any of its affiliates in accordance with the limitation 
set forth in the standstill provisions contained in the Purchase Agreement 
(discussed below) or (iv) any

                                  Page 2 of 11

<PAGE>

other securities (including shares of Common Stock issuable upon conversion, 
exercise or exchange thereof pursuant to their terms) received by SCF-IV or 
its affiliates pursuant to the Purchase Agreement.

         Under the Purchase Agreement, SCF-IV has agreed that, without the 
prior written consent of the Company, it will not sell or otherwise transfer 
any of the Shares to any other person or entity other than a partner of 
SCF-IV, who, in any event, shall agree to be bound by the transfer 
restrictions contained in the Purchase Agreement. SCF-IV has also agreed 
that, without the prior written consent of the Company, it will not, prior to 
the earlier of (i) the seventh anniversary of the Initial Closing, or (ii) 
the occurrence of a Change of Control (defined as (i) an agreement providing 
for a Business Combination (defined below under "Series B Preferred Stock") 
is approved by the Board of Directors of the Company or a Business 
Combination is consummated, (ii) a tender offer for Common Stock is approved 
or recommended by the Board of Directors of the Company or (iii) there is a 
redemption, repurchase or reacquisition by the Company of rights issued 
pursuant to the Rights Plan or any waiver of the application of the Rights 
Plan to any beneficial owner other than SCF-IV or its affiliates except as 
approved by SCF-IV's representative to the Board of Directors of the 
Company), sell or otherwise transfer the Underlying Shares in a single 
transaction or series of related transactions involving a number of shares in 
the aggregate constituting in excess of 1% of the Company's issued and 
outstanding shares of Common Stock at the time of such sale or transfer 
(based on the Company's most recent report filed with the Securities and 
Exchange Commission ("SEC") under the Securities Exchange Act of 1934, as 
amended (the "Exchange Act"), prior to such sale or transfer disclosing such 
number of outstanding shares) to any entity which SCF-IV knows competes to a 
material extent with the Company or is engaged to a material extent in the 
energy services or equipment business, without first offering such shares to 
the Company on the same terms and in the manner set forth in the Purchase 
Agreement (subject to certain exceptions relating to an underwritten public 
offering).

         The Company has agreed that, from and after the date of the Purchase 
Agreement, it will not issue any Permitted Parity Securities (as defined 
below), except for (i) the issuance of the Option Shares to SCF-IV or its 
affiliates pursuant to the Purchase Agreement, or (ii) the issuance of a 
number of shares of Permitted Parity Securities issued at a price of $1,000 
cash per share in a single series within eighteen months of the Initial 
Closing equal to 35,000 less the number of Option Shares purchased under the 
Purchase Agreement (or, if the Option Period shall not yet have expired, less 
the full 15,000 Option Shares); provided that if such Permitted Parity 
Securities are issued after the first anniversary of the Initial Closing, 
then SCF-IV will be entitled to prior written notice of such proposed 
issuance and the terms thereof and shall have a right of first refusal option 
to purchase any or all of such securities on the same terms as offered to the 
proposed purchaser. "Permitted Parity Securities" for this purpose means up 
to 35,000 shares of preferred stock of the Company constituting no more than 
two 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 B Preferred Stock and other Permitted Parity 
Securities as a single class and (iv) is PARI PASSU with the Series B 
Preferred Stock with respect to the payment of dividends and the 
distributions upon Liquidation (as defined in the Certificate of Designation 
of Series B Preferred Stock). The Series C Preferred Stock that may be issued 
pursuant

                                  Page 3 of 11
<PAGE>

to the Purchase Agreement shall be considered Permitted Parity Securities for 
purposes of the foregoing.

         The Company agrees that if it issues any Permitted Parity Securities 
(other than Option Shares) pursuant to the foregoing that have terms that 
SCF-IV reasonably believes to be more favorable to the purchaser of such 
shares than the terms of the Initial Shares, then SCF-IV shall have the right 
to exchange all of the Shares purchased under the Purchase Agreement (or, if 
such issuance occurs prior to the expiration of the Option Period and the 
Option Closing has not occurred, all of the Shares that may be purchased 
under the Purchase Agreement if SCF-IV agrees to pay the applicable purchase 
price therefor upon such exchange) on a share for share basis.

         By executing the Purchase Agreement, SCF-IV has agreed that, for a 
period commencing on the date of the Purchase Agreement and ending on the 
earlier of the third anniversary of the Initial Closing Date or the 
occurrence of a Change of Control (as defined), it will not:

               (a) directly or indirectly, take any action to acquire, in the
         aggregate, beneficial ownership of more than 4% of the Company's
         outstanding Common Stock or voting stock (based on the Company's most
         recent Exchange Act report filed with the SEC prior to such acquisition
         disclosing such number of outstanding shares), excluding from such
         ownership the Initial Shares and Option Shares or the Underlying Shares
         or any other Common Stock or voting stock acquired directly from the
         Company;

               (b) form or encourage the formation of a "group" within the
         meaning of Section 13(d)(3) of the Exchange Act, to acquire, change or
         influence control of the Company;

               (c) solicit, or participate in any "solicitation" of "proxies"
         or become a "participant" in any "election contest" or consent
         solicitation (as such terms are defined or used under Regulation 14A
         under the Exchange Act) with respect to the Company in opposition to
         the recommendation of a majority of the Board of Directors of the
         Company;

               (d) initiate, propose or otherwise solicit stockholders for
         the approval of, one or more stockholder proposals with respect to the
         Company or induce any person to initiate any stockholder proposal, in
         each case in opposition to the recommendation of a majority of the
         Board of Directors of the Company;

               (e) deposit any voting stock in a voting trust or subject them
         to a voting agreement or other agreement or arrangement with respect to
         the voting of such voting stock, other than any such trust, agreement
         or other arrangement involving no persons other than SCF-IV, its
         partners or affiliates; or

               (f) solicit, propose or negotiate with any other person
         (including the Company) with respect to any form of business
         combination or other extraordinary transaction with the Company or any
         of its subsidiaries, in each case which would result in a Change of
         Control, or solicit, make or propose or negotiate with any other person
         with respect to or announce

                                  Page 4 of 11

<PAGE>

         an intent to make, any tender offer or exchange offer for any
         securities of the Company, in each case in opposition to the
         recommendation of a majority of the Board of Directors of the Company,
         or publicly disclose an intent, purpose, plan or proposal with respect
         to the Company, any of its subsidiaries, or any securities or assets of
         the Company, that would violate the provisions of this paragraph (f);

provided, however, that nothing in the foregoing paragraphs (a)-(f) shall be 
deemed to limit in any way (i) the right of SCF-IV to exercise its voting 
rights in any manner it sees fit with respect to the Shares, the Underlying 
Shares or any other shares of voting stock acquired by SCF-IV in accordance 
with the Purchase Agreement, or (ii) the right of any director elected to the 
Board of Directors as a representative of the holders of the Shares to take 
any action he believes necessary to fulfill his fiduciary duties.

         The Company has agreed to indemnify SCF-IV and its affiliates and 
hold SCF-IV and its affiliates harmless from and against any and all 
liabilities, losses, damages, costs and expenses of any kind, which may be 
incurred by SCF-IV or such affiliates as a result of any claims made against 
SCF-IV or such affiliates by any person that relate to or arise out of (i) 
any breach by the Company of any of its representations, warranties or 
covenants contained in the Purchase Agreement or in the agreements related 
thereto, or (ii) any litigation, investigation or proceeding instituted by 
any person with respect to the Purchase Agreement or the Shares or the 
Underlying Shares (excluding, however, any such litigation, investigation or 
proceeding which arises solely from the acts or omissions of SCF-IV or its 
affiliates). Notwithstanding the foregoing, the Company will not be 
responsible for or assume any of the investment risk associated with any 
securities purchased under the Purchase Agreement.

THE SERIES B PREFERRED STOCK

         The holders of Series B Preferred Stock are entitled to receive 
cumulative cash dividends of $10.00 per annum (1% of the liquidation 
preference) for each share of Series B Preferred Stock. The Series B 
Preferred Stock is entitled to a liquidation preference of $1,000.00, plus 
all accrued but unpaid dividends.

         The Series B Preferred Stock is convertible at the holder's option 
after the first to occur of any of the following (the "Initial Conversion 
Date"): (i) the third anniversary of the original date of issuance of such 
Shares (the "Issue Date"), (ii) the approval by the Board of Directors of the 
Company of an agreement relating to a Business Combination or the 
consummation of a Business Combination, (iii) a tender offer for Common Stock 
is approved or recommended by the Board of Directors of the Company or (iv) 
the redemption, repurchase or reacquisition by the Company of rights issued 
pursuant to the Rights Plan or any waiver of the application of the Rights 
Plan to any beneficial owner other than SCF-IV or its affiliates (except as 
approved by SCF-IV's representative on the Board of Directors of the 
Company). After the Initial Conversion Date and prior to the Mandatory 
Conversion Date (defined below), the holders of Series B Preferred Stock will 
be entitled to convert any and all shares of Series B Preferred Stock into a 
number of fully paid and nonassessable shares of Common Stock per share equal 
to, at the option of the holder, one of, or if

                                  Page 5 of 11
<PAGE>

not specified by the holder, at the greater of, the following (such amount 
being referred to as the "Conversion Ratio"): (a) $1,000.00 (plus any accrued 
and unpaid dividends through the record date for determining shareholders 
entitled to vote) divided by the conversion price of $8.00 (as adjusted from 
time to time in accordance with the anti-dilution provisions in the Series B 
Preferred Stock's Certificate of Designation) or (b) $1,000.00 increased at a 
rate of eight percent per annum from the Issue Date, compounded quarterly, 
less the amount of cash dividends actually paid through the applicable 
conversion date (the "Adjusted Stated Value"), divided by the average market 
price for the Common Stock during the ten trading day period prior to the 
date of conversion (the "Conversion Ratio").

         On April 20, 1999, the closing sales price per share of the Common 
Stock on the New York Stock Exchange was $6.875.

         A "Business Combination" for this purpose means (i) any 
consolidation or merger of the Company with or into any person or (ii) any 
Change of Control Stock Issuance (defined below), 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. A "Change of Control Stock Issuance" means 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 
of Directors of the Company 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 issuance) constitute at least a 
majority of the Board of Directors of the Company immediately after such 
issuance, with no agreements or arrangements in place immediately after such 
consummation that would result in the members of the Board of Directors of 
the Company immediately prior to the entering into the agreement relating to 
such issuance ceasing to constitute at least a majority of the Board of 
Directors of the Company 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.

         On the fifth anniversary of the Issue Date (the "Mandatory 
Conversion Date"), each outstanding share of Series B Preferred Stock shall, 
without any action on the part of the holder, be converted automatically into 
a number of fully paid and nonassessable shares of Common Stock equal to the 
Conversion Ratio, provided the Shelf Registration Statement (discussed below) 
contemplated by the Registration Rights Agreement is then in effect.

         In the event of a conversion of Series B Preferred Stock pursuant to 
which the Conversion Ratio is determined using clause (b) above, then, 
provided that full cumulative dividends have been

                                  Page 6 of 11
<PAGE>

paid or declared and set apart for payment upon all outstanding shares of 
Series B Preferred Stock for all past dividend periods, the Company may 
redeem for cash up to 50% (or such greater percentage as the holders shall 
agree) of the shares of Series B Preferred Stock submitted for conversion at 
a redemption price per share equal to the Adjusted Stated Value (a 
"Redemption Offer"), in lieu of effecting such conversion.

         If the Company issues Common Stock upon conversion of the Series B 
Preferred Stock pursuant to which the Conversion Ratio is calculated pursuant 
to clause (b) of the definition of Conversion Ratio as set forth above, 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 B 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 
conversion of the Series B Preferred Stock and any substantially similar 
series of Permitted Parity Securities issued to the holder (including any 
Series C Preferred Stock) 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 B 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.

         Following the expiration or earlier termination of the applicable 
waiting period under the HSR Act (the "HSR Expiration Date"), holders of the 
Series B Preferred Stock will be entitled to vote upon all matters upon which 
the holders of Common Stock and other Permitted Parity Securities are 
entitled to vote. The holders of Series B Preferred Stock, when voting 
together with the Common Stock as a single class, will be entitled to cast a 
number of votes equal to $1,000.00 (plus any accrued and unpaid dividends 
through the record date for determining the shareholders entitled to vote) 
divided by the conversion price of $8.00 (as adjusted from time to time in 
accordance with the Series B Preferred Stock's Certificate of Designation). 
After the HSR Expiration Date, the holders of Series B Preferred Stock, 
voting together as a class with other Permitted Parity Securities, shall be 
entitled to elect one member of the Board of Directors of the Company. The 
consent of the holders of a majority of the Series B Preferred Stock, voting 
together as a class with other Permitted Parity Securities, will be necessary 
to (i) amend, alter or repeal the Series B Preferred Stock Certificate of 
Designation to authorize, create or issue parity securities or senior 
securities, (ii) issue any parity or senior securities or (iii) consummate 
any Business Combination. Further, the consent of the holders of at least a 
majority of the Series B Preferred Stock, voting separately as a single class 
with one vote per share, will be necessary to amend, alter or repeal any of 
the provisions of (i) the Series B Preferred Stock Certificate of Designation 
or any certificate of designation relating to any parity securities, or (ii) 
the Certificate of Incorporation of the Company, so as to adversely affect 
any of the rights, preferences or privileges of the holders of Series B 
Preferred Stock.

THE SERIES C PREFERRED STOCK

         The Series C Preferred Stock, if issued, will have substantially the 
same terms as the Series

                                  Page 7 of 11
<PAGE>

B Preferred Stock, except for the determination of the conversion price. The 
conversion price for the Series C Preferred Stock will be equal to 125% of 
the average market price per share of the Common Stock for the ten trading 
days ending on and including the trading day prior to the date on which 
SCF-IV notifies the Company that it wishes to exercise its option to purchase 
some or all of the Series C Preferred Stock; provided, however, that if such 
average is less than $4.80, then the initial conversion price shall be $6.00 
and if such average is higher than $6.80, the initial conversion price shall 
be $8.50, subject to certain anti-dilution adjustments.

THE REGISTRATION RIGHTS AGREEMENT

         The Company has entered into a Registration Rights Agreement with 
SCF-IV pursuant to which the holder or holders of at least 25% of the then 
outstanding Registrable Securities (which subject to certain limitations 
means the Underlying Shares and any other securities issued or issuable with 
respect to the Underlying Shares) at any time on or after the earlier of (i) 
the Initial Conversion Date or (ii) the date sixty days prior to the third 
anniversary of the date of the initial issuance of the Series B Preferred 
Stock, may request a registration of the Company of any or all of SCF-IV's 
Registrable Securities (a "Demand Registration"); provided, however, that the 
number of Registrable Securities to be included in such a Demand Registration 
must be at least 1,000,000 or such lesser number of Registrable Securities as 
have an aggregate market price of at least $10,000,000 as of the date of such 
request. The holders of Registrable Securities will be entitled to request an 
aggregate of two Demand Registrations. The Registration Rights Agreement also 
entitles the holders of Registrable Securities the right to have such 
securities registered whenever the Company proposes to register any 
securities under the Securities Act of 1933, as amended, (a "Piggyback 
Registration"). As contemplated by the Registration Rights Agreement, the 
ability of the holders of Registrable Securities to participate in Piggyback 
Registration will depend on the individual circumstances and the nature of 
the offering at issue. The Registration Rights Agreement obligates the 
Company to file a shelf registration statement (the "Shelf Registration 
Statement") relating to all of the Registrable Securities prior to the 
Mandatory Conversion Date and to cause such Shelf Registration Statement to 
remain in effect for one year (subject to certain suspension rights). The 
registration expenses with relation to Registrable Securities included in a 
Demand Registration will be borne by the holders of Registrable Securities; 
the registration expenses with relation to Registrable Securities included in 
a Piggyback Registration or the Shelf Registration will be borne by the 
Company.

BENEFICIAL OWNERSHIP BY SCF-IV

         According to its Schedule 13D filed with the SEC on April 30, 1999, 
SCF-IV may be deemed to beneficially own 5,000,000 shares of Common Stock 
based on its acquisition of 40,000 shares of Series B Preferred Stock. The 
5,000,000 shares of Common Stock represent shares issuable to SCF-IV upon 
conversion of the Initial Shares, based on the $8.00 fixed conversion price 
described above. Such 5,000,000 shares of Common Stock would constitute 
approximately 9.0% of the issued and outstanding Common Stock of the Company. 
This amount excludes (i) an indeterminate number of additional shares of 
Common Stock that may be acquired by SCF-IV upon conversion of the Initial 
Shares pursuant to market price-based conversions as described above, or in 
respect of accrued and unpaid dividends and (ii) shares of Common Stock that 
may be acquired upon the conversion of the

                                  Page 8 of 11

<PAGE>

Option Shares, since the conversion price for such shares has not been 
established.

         The sale of the Series B Preferred Stock and the offer to sell the 
Series C Preferred Stock was made in reliance on the exemption from 
registration provided by Section 4(2) of the Securities Act of 1933, as 
amended.

         The foregoing, to the extent it summarizes terms of agreements or 
documents, is qualified in its entirety by reference to the full text of such 
documents, copies of which have been filed herewith as exhibits and are 
incorporated herein by reference.

                                  Page 9 of 11
<PAGE>

<TABLE>
<CAPTION>

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.
<S>      <C>      <C>
         4.1*     Certificate of Designation related to Series B Preferred Stock
                  dated May 7, 1999.

         4.2*     Form of Certificate of Designation related to Series C 
                  Preferred Stock.

        10.1*     Purchase Agreement by and between the Company and SCF-IV dated
                  April 21, 1999.

        10.2*     Registration Rights Agreement by and between the Company and 
                  SCF-IV dated May 7, 1999.

        10.3*     First Amendment to Rights Agreement by and between the Company
                  and Harris Trust and Savings Bank as Rights Agent, dated 
                  April 21, 1999.
</TABLE>


- ------------------
*  Filed herewith.


                                  Page 10 of 11
<PAGE>

                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934, 
the registrant has duly caused this report to be signed on its behalf by the 
undersigned hereunto duly authorized.

                                       INPUT/OUTPUT, INC.


                                       By:     /s/ W. J. "ZEKE" ZERINGUE
                                              ------------------------------
                                                W. J. "Zeke" Zeringue
                                                Chief Executive Officer
Date: May 7, 1999



                                  Page 11 of 11

<PAGE>

                           CERTIFICATE OF DESIGNATION
                                       OF
                            SERIES B 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 B 
Preferred Stock, $0.01 par value per share, which shall consist of 40,000 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 B 
Preferred Stock shall be 40,000.   The Series B Preferred Stock shall rank 
senior to the Company's Series A 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 B 
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.

<PAGE>

       "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 B 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 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 


                                      -2-
<PAGE>

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 $8.00, as adjusted from time to time in 
accordance with SECTION 7.
       
       "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.

       "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


                                      -3-
<PAGE>

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 B 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.

       "INITIAL CONVERSION DATE" means the first to occur of any of the 
following:  (i) the third anniversary of the date on which shares of Series B 
Preferred Stock are first issued pursuant to the Purchase Agreement, (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 B Preferred 
Stock the original date of issuance of such shares of Series B Preferred 
Stock.

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


                                      -4-
<PAGE>

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 B 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 B 
Preferred Stock.

       "PERMITTED PARITY SECURITIES" means up to 35,000 shares of Preferred 
Stock of the Company constituting no more than two 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 B 
Preferred Stock and other Permitted Parity Securities as a single class and 
(iv) is PARI PASSU with the Series B Preferred Stock with respect to the 
payment of dividends and distributions upon Liquidation.  The Series C 
Preferred Stock that may be issued pursuant to the Purchase Agreement shall 
be considered Permitted Parity Securities for purposes of the foregoing.  

       "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 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.


                                      -5-
<PAGE>

       "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 the date of the Initial Closing under the Purchase 
Agreement 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 B 
Preferred Stock.

       "SERIES C PREFERRED STOCK" means the Series C Preferred Stock of the 
Company that may be issued to Purchaser pursuant to the Purchase Agreement. 

       "STATED VALUE" is an amount equal to $1,000.00 per share of Series B 
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-
<PAGE>

       "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 B 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 B 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 June 30, 1999; 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 B
       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.

            (C)    So long as any shares of the Series B Preferred Stock 
       shall be outstanding, (i) the Company shall not declare or pay any 
       dividend whatsoever, whether in cash, property 


                                      -7-
<PAGE>

       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 B 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 B 
       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 B 
       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 B Preferred Stock:

            (A)    Subject to applicable law, the shares of Series B 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, Holders of shares of the Series B 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 B 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 B 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 B Preferred Stock, voting 
       together with Permitted Parity Securities as a separate class with one 
       vote per share of Series B 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 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 B Preferred 


                                      -8-
<PAGE>

       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 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 B Preferred Stock, voting together with 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 B 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 B 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 B 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 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 


                                      -9-
<PAGE>

Liquidation Preference on all outstanding shares of the Series B Preferred 
Stock and all outstanding Senior Securities or Parity Securities, in each 
case ranking on parity with the Series B 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 B Preferred Stock and holders of such Senior Securities or 
Parity Securities will be distributed ratably among the Holders of the Series 
B 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 B 
Preferred Stock at their respective addresses as the same shall appear on the 
books of the Company.

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

            (A)   CONVERSION AT HOLDER'S OPTION.  The Holder of any shares of 
       Series B 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 B 
       Preferred Stock into a number of fully paid and nonassessable shares 
       of Common Stock for each such share of Series B Preferred Stock equal 
       to the Conversion Ratio, upon the terms hereinafter set forth.  
       
            (B)   MANDATORY CONVERSION.   On the fifth anniversary of the 
       date on which shares of Series B Preferred Stock are first issued 
       pursuant to the Purchase Agreement (the "MANDATORY CONVERSION DATE"), 
       each outstanding share of Series B 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 B 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 B 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:

                  (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 


                                      -10-

<PAGE>

            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 B 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 B 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 B Preferred Stock are to be issued in a 
       name other than the name on the face of the certificates representing 
       such shares of Series B 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 B 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 B 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 B Preferred 
       Stock.  If more than one share of Series B 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 B Preferred Stock so surrendered.  Instead of any fractional 
       share of Common Stock which would otherwise be issuable upon 
       conversion of any shares of Series B Preferred Stock, the Company 
       shall pay 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 B Preferred Stock will be
            deemed to have been issued to the Person 


                                      -11-
<PAGE>

            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 B 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 B 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 B 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 B 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 B 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 B Preferred Stock or of
            any share of Common Stock issued or issuable upon the conversion
            of the Series B Preferred Stock in any manner which interferes
            with the timely conversion of the Series B Preferred Stock.

            (G)   RIGHTS.  Whenever the Company issues shares of Common Stock 
       upon conversion of Series B 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 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 


                                      -12-
<PAGE>

       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 B 
       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 B 
       Preferred Stock for all past dividend periods, the Company may offer 
       to redeem for cash any or all of such shares of Series B 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 B 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 B 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 B 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 B 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 B 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 
       conversion of the Series B 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 B Preferred Stock are submitted for 
       conversion such that the NYSE Limitation would be 


                                      -13-
<PAGE>

       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 B 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; 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


                                      -14-
<PAGE>

            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 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 


                                      -15-
<PAGE>

                                 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 B 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 B Preferred Stock 
       been converted or 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 


                                      -16-
<PAGE>

       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 B 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 B 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 
       necessary, the provisions set forth herein with respect to the rights 
       and interests thereafter of the Holders of the shares of Series B 
       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 B 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 B Preferred Stock shall have the right to make a 


                                      -17-
<PAGE>

       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 B 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 B 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 B 
       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 property to be delivered upon a conversion or exchange 
       of Series B 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 B Preferred Stock. In the case of any action which would 
       require the fixing or a record date, such notice shall be given at 


                                      -18-
<PAGE>

       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 B 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 B PREFERRED STOCK. No share or shares of 
Series B Preferred Stock the Company acquires through redemption, option, 
exchange or otherwise will be reissued as Series B Preferred Stock, and all 
such shares will be canceled, retired and eliminated from the shares of 
Series B 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 B Preferred Stock.  

       9.   WAIVERS.  With the written consent of Holders of a Majority of 
the Series B 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 B Preferred Stock.

                 REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.
                                       


                                      -19-
<PAGE>

       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 6th 
day of May, 1999.

                                        INPUT/OUTPUT, INC.


                                        By: /s/ Axel M. Sigmar       
                                            -------------------------
                                                President

ATTEST:


By: /s/ Ronald A. Harris         
    -----------------------------
        Assistant Secretary




                                      -20-


<PAGE>

                           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 

<PAGE>

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-
<PAGE>

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-
<PAGE>

       "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-
<PAGE>

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-
<PAGE>

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-
<PAGE>

       "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-
<PAGE>

               (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-
<PAGE>

       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-
<PAGE>

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-

<PAGE>

                      (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-
<PAGE>

       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-
<PAGE>

       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-
<PAGE>

       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-
<PAGE>

               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-
<PAGE>

                                     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-
<PAGE>

       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-
<PAGE>

       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-
<PAGE>

       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-
<PAGE>

       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-


<PAGE>

                                  PURCHASE AGREEMENT

                                    BY AND BETWEEN

                                  INPUT/OUTPUT, INC.

                                         AND

                                     SCF-IV, L.P.


                               SERIES B PREFERRED STOCK
                                         AND
                               SERIES C PREFERRED STOCK



                                    APRIL 21, 1999

<PAGE>

                                 TABLE OF CONTENTS

<TABLE>
<S>            <C>                                                          <C>
                                      ARTICLE I.
                                     DEFINITIONS
Section 1.1    Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 1.2    References and Titles . . . . . . . . . . . . . . . . . . . . 8

                                    ARTICLE II.
                               PURCHASE OF THE SHARES
Section 2.1    Purchase of the Initial Shares. . . . . . . . . . . . . . . . 8
Section 2.2    Option to Purchase Option Shares. . . . . . . . . . . . . . . 8

                                    ARTICLE III.
                   REPRESENTATIONS AND WARRANTIES OF THE COMPANY
Section 3.1    Organization, Standing and Power. . . . . . . . . . . . . . . 9
Section 3.2    Subsidiaries. . . . . . . . . . . . . . . . . . . . . . . . .10
Section 3.3    Capital Structure . . . . . . . . . . . . . . . . . . . . . .10
Section 3.4    Authority; No Violations; Approvals . . . . . . . . . . . . .11
Section 3.5    SEC Documents . . . . . . . . . . . . . . . . . . . . . . . .12
Section 3.6    Absence of Certain Changes or Events. . . . . . . . . . . . .13
Section 3.7    No Undisclosed Material Liabilities . . . . . . . . . . . . .14
Section 3.8    No Default. . . . . . . . . . . . . . . . . . . . . . . . . .14
Section 3.9    Compliance with Applicable Laws . . . . . . . . . . . . . . .15
Section 3.10   Litigation. . . . . . . . . . . . . . . . . . . . . . . . . .15
Section 3.11   Certain Agreements. . . . . . . . . . . . . . . . . . . . . .16
Section 3.12   Status of Shares. . . . . . . . . . . . . . . . . . . . . . .16
Section 3.13   Intellectual Property; Year 2000. . . . . . . . . . . . . . .16
Section 3.14   Environmental Matters . . . . . . . . . . . . . . . . . . . .17
Section 3.15   No Brokers or Finders . . . . . . . . . . . . . . . . . . . .17
Section 3.16   Vote. . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Section 3.17   Related Party Transactions. . . . . . . . . . . . . . . . . .18
Section 3.18   Certain Anti-Takeover Provisions; Rights Plan . . . . . . . .18

                                    ARTICLE IV.
                    REPRESENTATIONS AND WARRANTIES OF PURCHASER
Section 4.1    Organization, Standing and Power. . . . . . . . . . . . . . .18
Section 4.2    Authority; Approvals. . . . . . . . . . . . . . . . . . . . .18
Section 4.3    Investment Intent . . . . . . . . . . . . . . . . . . . . . .19
Section 4.4    Purchaser Status. . . . . . . . . . . . . . . . . . . . . . .19
Section 4.5    No Brokers or Finders . . . . . . . . . . . . . . . . . . . .19
Section 4.6    Access to Information . . . . . . . . . . . . . . . . . . . .20

                                     ARTICLE V.
                                     COVENANTS
Section 5.1    Affirmative Covenants of the Company. . . . . . . . . . . . .20
Section 5.2    Negative Covenants of the Company . . . . . . . . . . . . . .20
</TABLE>


                                      -i-
<PAGE>
<TABLE>
<S>            <C>                                                          <C>
Section 5.3    Cooperation; Approvals. . . . . . . . . . . . . . . . . . . .21
Section 5.4    HSR Act Notification. . . . . . . . . . . . . . . . . . . . .21
Section 5.5    Notification of Certain Matters . . . . . . . . . . . . . . .21
Section 5.6    Board of Directors. . . . . . . . . . . . . . . . . . . . . .22
Section 5.7    Registration Rights Agreement . . . . . . . . . . . . . . . .22
Section 5.8    Transfer Restrictions . . . . . . . . . . . . . . . . . . . .22
Section 5.9    Stock Exchange Listing. . . . . . . . . . . . . . . . . . . .24
Section 5.10   Access; Confidentiality . . . . . . . . . . . . . . . . . . .24
Section 5.11   Issuance of Additional Preferred Stock. . . . . . . . . . . .24
Section 5.12   Standstill Agreement. . . . . . . . . . . . . . . . . . . . .25
Section 5.13   Indemnification . . . . . . . . . . . . . . . . . . . . . . .26
Section 5.14   Rights Plan . . . . . . . . . . . . . . . . . . . . . . . . .27

                                    ARTICLE VI.
                        CONDITIONS PRECEDENT TO THE CLOSINGS
Section 6.1    Conditions Precedent to Each Party's Obligation . . . . . . .27
Section 6.2    Conditions Precedent to Obligation of Purchaser . . . . . . .27
Section 6.3    Conditions Precedent to Obligations of Company. . . . . . . .28

                                    ARTICLE VII.
                                    THE CLOSINGS
Section 7.1    The Closings. . . . . . . . . . . . . . . . . . . . . . . . .29
Section 7.2    Actions to Occur at the Initial Closing . . . . . . . . . . .29
Section 7.3    Actions to Occur at the Option Closing. . . . . . . . . . . .30

                                   ARTICLE VIII.
                                    TERMINATION
Section 8.1    Termination . . . . . . . . . . . . . . . . . . . . . . . . .30
Section 8.2    Effect of Termination . . . . . . . . . . . . . . . . . . . .31

                                     ARTICLE IX.
               RECOVERY OF FEES. . . . . . . . . . . . . . . . . . . . . . .31

                                     ARTICLE X.
                                   MISCELLANEOUS
Section 10.1   Survival of Provisions. . . . . . . . . . . . . . . . . . . .32
Section 10.2   No Waiver; Modification in Writing. . . . . . . . . . . . . .32
Section 10.3   Specific Performance. . . . . . . . . . . . . . . . . . . . .32
Section 10.4   Severability. . . . . . . . . . . . . . . . . . . . . . . . .33
Section 10.5   Fees and Expenses . . . . . . . . . . . . . . . . . . . . . .33
Section 10.6   Parties in Interest . . . . . . . . . . . . . . . . . . . . .33
Section 10.7   Notices . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Section 10.8   Counterparts. . . . . . . . . . . . . . . . . . . . . . . . .34
Section 10.9   Entire Agreement; Termination of Confidentiality Agreement. .34
Section 10.10  Governing Law . . . . . . . . . . . . . . . . . . . . . . . .34
Section 10.11  Public Announcements. . . . . . . . . . . . . . . . . . . . .34
</TABLE>


                                      -ii-
<PAGE>

<TABLE>
<S>            <C>                                                          <C>
Section 10.12  Assignment. . . . . . . . . . . . . . . . . . . . . . . . . .35
Section 10.13  Headings. . . . . . . . . . . . . . . . . . . . . . . . . . .35
</TABLE>

<TABLE>
<S>                           <C>
Exhibit 1.1(a)                Certificate of Designation relating to Series B
                              Preferred Stock
Exhibit 1.1(b)                Certificate of Designation relating to Series C
                              Preferred Stock
Exhibit 5.7                   Form of Registration Rights Agreement
Exhibits 6.2(e)(i) and (ii)   Form of Company Counsel Opinions
</TABLE>

<PAGE>

                              PURCHASE AGREEMENT


       PURCHASE AGREEMENT, dated as of April 21, 1999, by and between 
Input/Output, Inc., a Delaware corporation (together with its successors, if 
any, the "COMPANY"), and SCF-IV, L.P., a Delaware limited partnership, (the 
"PURCHASER").

       In consideration of the mutual covenants and agreements set forth 
herein and for good and valuable consideration, the receipt of which is 
hereby acknowledged, the parties hereto agree as follows:

                                  ARTICLE I.
                                 DEFINITIONS

       Section 1.1    DEFINITIONS.  As used in this Agreement, and unless the 
context requires a different meaning, the following terms have the meanings 
indicated:

       "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 and this Agreement, 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.

       "AGREEMENT" means this Purchase Agreement, as the same may be amended, 
supplemented or modified from time to time in accordance with the terms 
hereof.

       "APPROVAL" means any approval, authorization, grant of authority, 
consent, order, qualification, permit, license, variance, exemption, 
franchise, concession, certificate, filing or registration or any waiver of 
the foregoing, or any notice, statement or other communication required to be 
filed with, delivered to or obtained from any Governmental Entity or any 
other Person.

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

       "BUSINESS COMBINATION" means (i) any consolidation, merger, share 
exchange or similar business combination transaction involving the Company 
with any Person or (ii) the sale, assignment, conveyance, transfer, lease or 
other disposition by the Company of all or substantially all of its assets.

       "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 government actions 
to close.

       "BYLAWS" mean the Company's bylaws, as amended from time to time.

       "CAPITAL STOCK" means (i) with respect to any Person that is a 
corporation or company, any and all shares, interests, participations or 
other equivalents (however designated) of capital or capital 


                                      -4-
<PAGE>

stock of such Person and (ii) with respect to any Person that is not a 
corporation or company, any and all partnership or other equity interests of 
such Person.

       "CERTIFICATES OF DESIGNATION" shall mean the Certificates of 
Designation for the Series B Preferred Stock and the Series C Preferred Stock 
in substantially the form attached hereto as EXHIBITS 1.1(a) AND 1.1(b), with 
such changes as are contemplated by the terms thereof or this Agreement.

       "CERTIFICATE OF INCORPORATION" means the Company's Certificate of 
Incorporation, as amended from time to time.

       "CHANGE OF CONTROL" means the occurrence of any event specified in 
clauses (ii), (iii) or (iv) of the definition of  "Initial Conversion Date" 
set forth in the Certificate of Designation for the Series B Preferred Stock.

       "CLOSING" has the meaning set forth in SECTION 7.1(b).

       "CLOSING DATE" has the meaning set forth in SECTION 7.1(b).

       "CODE" means the Internal Revenue Code of 1986, as amended, and the 
rules and regulations thereunder as in effect on the date hereof.

       "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 an agreement or Business Combination to which the Company is a 
party.

       "COMPANY" has the meaning set forth in the introductory paragraph 
hereof.

       "COMPANY DISCLOSURE SCHEDULE" has the meaning set forth in Article III.

       "COMPANY 1998 FORM 10-K" means the Report on Form 10-K filed by the 
Company with the SEC for the year ended May 31, 1998.

       "COMPANY OPTIONS" has the meaning set forth in SECTION 3.3(c).

       "COMPANY SEC DOCUMENTS" has the meaning set forth in SECTION 3.5.

       "CONTRACTS" means all agreements, contracts, or other binding 
commitments, arrangements or plans, written or oral (including any amendments 
and other modifications thereto), to which the Company or any of its 
Subsidiaries is a party or is otherwise bound.

       "CURRENT SEC REPORTS"  means the Company 1998 Form 10-K, the proxy 
statement for the Company's 1998 annual meeting of stockholders, and all 
Company SEC Documents filed by the Company since the time of initial filing 
of either documents.

       "ENVIRONMENTAL LAWS" has the meaning set forth in SECTION 3.14.


                                      -5-
<PAGE>

       "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended, 
and the rules and regulations of the SEC promulgated thereunder.

       "EXERCISE NOTICE"  has the meaning set forth in SECTION 2.2(a).

       "GAAP" has the meaning set forth in SECTION 3.5(b).

       "GOVERNMENTAL ENTITY" means any agency, bureau, commission, court, 
authority, department, official, political subdivision, tribunal or other 
instrumentality of any government, whether (i) regulatory, administrative or 
otherwise, (ii) federal, state or local, or (iii) domestic or foreign.

       "HAZARDOUS MATERIALS" has the meaning set forth in SECTION 3.14.

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

       "INITIAL CLOSING"  has the meaning set forth in SECTION 7.1(a).

       "INITIAL CLOSING DATE"  has the meaning set forth in SECTION 7.1(a).

       "INITIAL PURCHASE PRICE" has the meaning set forth in SECTION 2.1(b).

       "INITIAL SHARES" means the 40,000 shares of Series B Preferred Stock 
to be purchased by Purchaser pursuant to this Agreement.

       "INTELLECTUAL PROPERTY" has the meaning set forth in SECTION 3.13.

       "KNOWLEDGE" of any Person means the actual knowledge of such Person's 
executive and financial officers and directors, in each case after reasonable 
inquiry of such other officers of such Person with direct responsibility for 
the Person's business relating to such knowledge.

       "LAW" means any constitutional provision, statute or other law, 
ordinance, rule, regulation or interpretation of any thereof and any Order of 
any Governmental Entity (including Environmental Laws) now in effect.

       "LIEN" means any mortgage, lien, pledge, encumbrance, easement, charge 
or security interest of any kind (including any agreement to give any of the 
foregoing, any conditional sale or other title retention agreement or any 
lease in the nature thereof).

       "LITIGATION" has the meaning set forth in SECTION 3.10.

       "MATERIAL ADVERSE EFFECT" or "MATERIAL ADVERSE CHANGE" means any 
effect, change, event or occurrence that is materially adverse to the 
business, operations, properties, condition (financial or otherwise), results 
of operations, assets, liabilities or prospects of the Company and its 
Subsidiaries taken as a whole.

       "MATERIAL CONTRACTS" has the meaning set forth in SECTION 3.11(a).


                                      -6-
<PAGE>

       "OPTION CLOSING"  has the meaning set forth in SECTION 7.1(b).

       "OPTION CLOSING DATE"  has the meaning set forth in SECTION 7.1(b).

       "OPTION PURCHASE PRICE" has the meaning set forth in SECTION 2.2(c).

       "OPTION SHARES" means the up to 15,000 shares of Series C Preferred 
Stock of the Company that may be purchased by Purchaser in accordance with 
SECTION 2.2.

       "ORDER" means any decree, injunction, judgment, settlement, order, 
ruling, assessment or writ of a court.

       "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.

       "PURCHASER" has the meaning set forth in the introductory paragraph 
hereto.

       "PURCHASER'S EXPENSES" means all reasonable out-of-pocket fees, costs 
and expenses incurred by Purchaser in connection with the transactions 
contemplated by this Agreement and the other Transaction Documents and its 
due diligence efforts in connection therewith, including (i) fees, costs and 
expenses of its accountants, counsel and other similar advisors (including a 
$25,000 fee to be paid to a technical advisor) and (ii) fees paid to any 
Governmental Entity (including fees payable in connection with filings under 
the HSR Act pursuant to SECTION 5.4).

       "REGISTRATION RIGHTS AGREEMENT" means the Registration Rights 
Agreement in the form of EXHIBIT 5.7.

       "RIGHTS PLAN" has the meaning set forth in SECTION 3.3(a).

       "SEC" means the Securities and Exchange Commission.

       "SECURITIES ACT" means the Securities Act of 1933, as amended, and the 
rules and regulations of the SEC promulgated thereunder.

       "SERIES B PREFERRED STOCK" means the Company's Series B Preferred 
Stock, $.01 par value per share, which shall have the terms set forth in the 
Certificate of Designation attached hereto as EXHIBIT 1.1(a).

       "SERIES C PREFERRED STOCK" means the Company's Series C Preferred 
Stock, $.01 par value per share, which shall have the terms set forth in the 
Certificate of Designation attached hereto as EXHIBIT 1.1(b), except that the 
initial "Conversion Price" set forth therein shall be equal to 125% of the 
average Market Price (as defined in such Certificate of Designation) for the 
ten Trading Days (as defined in such Certificate of Designation) ending on 
and including the Trading Day prior to the Exercise Notice; PROVIDED, 
HOWEVER, that if such average is less than $4.80, then the initial Conversion 
Price shall be $6.00 and if such average is higher than $6.80, the initial 
Conversion Price shall be 


                                      -7-
<PAGE>

$8.50 (which dollar amounts shall be adjusted for events or actions occurring 
prior to the date of the Exercise Notice, and which Conversion Price shall be 
adjusted for events or actions occurring after the date of the Exercise 
Notice and prior to the Option Closing, in each case in the same manner as 
the Conversion Price would be adjusted as set forth in such Certificate of 
Designation for events occurring after the Option Closing).

       "SHARES" means the Initial Shares and the Option Shares.

       "STOCK PLANS" means the Company's stock option, stock incentive,
restricted stock, employee stock purchase or other similar plans.

       "SUBSIDIARY" means, (i) a corporation, a majority of whose stock with
voting power, under ordinary circumstances, to elect directors is at the time,
directly or indirectly, owned by the Company, by a Subsidiary of the Company or
by the Company and another Subsidiary, or (ii) any other Person (other than a
corporation) in which the Company, a Subsidiary or the Company and a Subsidiary,
directly or indirectly, at the date of determination thereof has at least a
majority ownership interest.

       "TRANSACTION DOCUMENTS" means this Agreement, the Certificates of
Designation and the Registration Rights Agreement.

       "TRANSFER" has the meaning set forth in SECTION 5.8.

       "UNDERLYING SHARES" means the shares of Common Stock issuable upon
conversion of the Shares in accordance with the terms thereof.

       "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; provided that if such Person has
more than one class or series of Voting Stock, any calculation as to a
percentage of such Voting Stock shall be made with respect to the percentage of
aggregate votes entitled to be cast in respect of all such Voting Stock in such
circumstances.

       Section 1.2    REFERENCES AND TITLES.  All references in this Agreement
to Exhibits, Schedules, Articles, Sections, subsections, and other subdivisions
refer to the corresponding Exhibits, Schedules, Articles, Sections, subsections,
and other subdivisions of this Agreement unless expressly provided otherwise. 
Titles appearing at the beginning of any Articles, Sections, subsections, or
other subdivisions of this Agreement are for convenience only, do not constitute
any part of such Articles, Sections, subsections or other subdivisions, and
shall be disregarded in construing the language contained therein.  The words
"THIS AGREEMENT," "HEREIN," "HEREBY," "HEREUNDER," and "HEREOF," and words of
similar import, refer to this Agreement as a whole and not to any particular
subdivision unless expressly so limited.  The words "THIS SECTION," "THIS
SUBSECTION," and words of similar import, refer only to the Sections or
subsections hereof in which such words occur.  The word "INCLUDING" (in its
various forms) means "including without limitation."  Pronouns in masculine,
feminine, or neuter genders shall be construed to state and include any other
gender and words, terms, and titles (including terms defined herein) in the
singular form shall be construed to include the plural and vice 


                                      -8-
<PAGE>

versa, unless the context otherwise expressly requires.  Unless the context 
otherwise requires, all defined terms contained herein shall include the 
singular and plural forms of such defined terms.

                                 ARTICLE II.
                            PURCHASE OF THE SHARES

       Section 2.1    PURCHASE OF THE INITIAL SHARES.

       (a)     Subject to the terms and conditions herein set forth, at the 
Initial Closing, the Company will sell to Purchaser, and Purchaser will 
purchase from the Company, the Initial Shares.

       (b)     The aggregate purchase price payable for the Initial Shares 
shall be $40 million (the "INITIAL PURCHASE PRICE").

       (c)     Delivery of the Initial Shares shall be made at the Initial 
Closing by delivery to Purchaser, against payment of the Initial Purchase 
Price therefor as provided herein, of one or more share certificates, 
registered in the name of Purchaser, representing the Initial Shares.

       (d)     Payment of the Initial Purchase Price for the Initial Shares 
to be purchased hereunder shall be made by or on behalf of Purchaser by wire 
transfer of immediately available funds to an account of the Company (the 
number for which account shall have been furnished to Purchaser at least two 
Business Days prior to the Initial Closing Date).

       Section 2.2    OPTION TO PURCHASE OPTION SHARES.

       (a)     Purchaser may, at its sole option, at any time prior to the 
expiration of 90 days after the Initial Closing, deliver a written notice of 
its intention to purchase up to 15,000 Option Shares (the "EXERCISE NOTICE") 
to the Company.  The Exercise Notice shall specify the number of Option 
Shares to be purchased and a Business Day between 10 and 20 calendar days 
after such notice upon which the Option Closing shall occur.

       (b)     If Purchaser delivers the Exercise Notice in accordance with 
Section 2.2(a), then,  subject to the terms and conditions herein set forth, 
at the Option Closing, the Company will sell to Purchaser, and Purchaser will 
purchase from the Company, the number of Option Shares to be purchased by the 
Purchaser as specified in the Exercise Notice.

       (c)     The purchase price payable for the Option Shares shall be 
$1,000 per share (the aggregate amount of such purchase price being referred 
to herein as the  "OPTION PURCHASE PRICE").

       (d)     Delivery of the Option Shares shall be made at Option Closing 
by delivery to Purchaser, against payment of the Option Purchase Price 
therefor as provided herein, of  one or more share certificates, registered 
in the name of Purchaser, representing the Option Shares so purchased.

       (e)     Payment of the Option Purchase Price for the Option Shares to 
be purchased hereunder shall be made by or on behalf of Purchaser by wire 
transfer of immediately available funds 


                                      -9-

<PAGE>

to an account of the Company (the number for which account shall have been 
furnished to Purchaser at least two Business Days prior to the Option Closing 
Date).

                                 ARTICLE III.
                REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                                       
       The Company represents and warrants to Purchaser as follows (in each 
case as qualified by matters reflected on the disclosure schedule dated as of 
the date of this Agreement by reference to the Section of this Agreement so 
qualified and delivered by the Company to Purchaser prior to the date of this 
Agreement (the "COMPANY DISCLOSURE SCHEDULE") and made a part hereof by 
reference):

       Section 3.1    ORGANIZATION, STANDING AND POWER.  Each of the Company 
and each of its Subsidiaries is a corporation or other entity duly organized, 
validly existing and in good standing under the laws of the jurisdiction in 
which it is incorporated or organized and has the requisite corporate or 
other such entity power and authority to own its properties and carry on its 
business as now being conducted.  Each of the Company and each of its 
Subsidiaries is duly qualified or licensed to transact business and is in 
good standing in each jurisdiction in which the nature of its business or the 
ownership or leasing of its properties makes such qualification or licensing 
necessary, other than in such jurisdictions where the failure to be so 
qualified or licensed or to be in good standing, individually or in the 
aggregate, has not had and could not reasonably be expected to have a 
Material Adverse Effect.  The Company has delivered to Purchaser prior to the 
execution of this Agreement complete and correct copies of its Certificate of 
Incorporation and Bylaws, each as amended to date, and, in the case of the 
Company's Subsidiaries, made available similar organizational documents in 
each case, as in effect on the date of this Agreement.

       Section 3.2    SUBSIDIARIES.  Except as set forth in the Current SEC 
Reports, all the outstanding shares of Capital Stock of each Subsidiary of 
the Company that would constitute a "significant subsidiary" within the 
meaning of the SEC's Regulation S-X have been validly issued and are fully 
paid and nonassessable (with respect to corporate Subsidiaries) and are owned 
directly or indirectly by the Company, free and clear of all Liens other than 
Liens securing obligations for money borrowed by the Company.

       Section 3.3    CAPITAL STRUCTURE.

       (a)     The authorized Capital Stock of the Company consists of 
100,000,000 shares of Common Stock and 5,000,000 shares of preferred stock, 
$.01 par value, which may be divided into and issued in one or more series 
upon the creation thereof by the Board.  As of the date of this Agreement, 
(A) 50,499,898 shares of Common Stock are issued and outstanding (including 
the attached preferred share purchase rights issued pursuant to the Rights 
Agreement dated as of January 17, 1997, as amended to date, between the 
Company and Harris Trust and Savings Bank as rights agent (the "RIGHTS 
PLAN")), (B) 7,991,161 shares of Common Stock have been authorized and 
reserved for issuance under the Stock Plans, (C) 0 shares of Common Stock are 
held by the Company in its treasury, (D) no shares of Common Stock are held 
by any of the Company's Subsidiaries, and (E) an aggregate of 100,000 shares 
of preferred stock have been designated as the Series A Preferred Stock.  
Except as described in this SECTION 3.3, the Company has no authorized, 
issued or outstanding shares or Capital Stock as of the date of this 
Agreement.


                                      -10-
<PAGE>

       (b)     There are no restrictions or limitations, contractual or 
otherwise, binding upon the Company or any of its Subsidiaries or to which 
the Company or any of its Subsidiaries is subject that prohibit or limit the 
enforceability of the terms and provisions of the Certificates of Designation 
or will prohibit or limit the right of a holder of Shares to convert the 
Shares into shares of Common Stock in accordance with their terms; and the 
conversion of any Shares into shares of Common Stock will not violate or 
result in or constitute a default under any loan or credit agreement, note, 
bond, mortgage, indenture, lease, permit, concession, franchise, license or 
any other contract, agreement, arrangement or understanding to which the 
Company or any of its Subsidiaries is a party or by which they or any of 
their properties or assets are bound.

       (c)     There are no outstanding warrants, share or stock options, 
share or stock appreciation rights or other rights to receive or purchase any 
Capital Stock of the Company or any of its Subsidiaries granted under the 
Stock Plans or otherwise except as set forth in SCHEDULE 3.3(c) of the 
Company Disclosure Schedule (such warrants, share or stock options, shares or 
stock appreciation rights or other rights disclosed thereon, collectively, 
the "COMPANY OPTIONS"). Except for the Company Options and except as provided 
in the Transaction Agreements, there are no outstanding securities, options, 
warrants, calls, rights, commitments, agreements, arrangements or 
undertakings of any kind to which the Company or any of its Subsidiaries is a 
party or by which any of them is bound obligating the Company or any of its 
Subsidiaries to issue, deliver or sell, or cause to be issued, delivered or 
sold, any Capital Stock of the Company or of any of its Subsidiaries or 
obligating the Company or any of its Subsidiaries to issue, grant, extend or 
enter into any such security, option, warrant, call, right, commitment, 
agreement, arrangement or undertaking.  There are no outstanding  obligations 
of the Company or any of its Subsidiaries (contingent or otherwise) to 
repurchase, redeem or otherwise acquire any Capital Stock of the Company or 
any of its Subsidiaries or any security exchangeable for or convertible into 
such Capital Stock.

       (d)     All outstanding Capital Stock of the Company and its 
Subsidiaries are duly authorized, validly issued, fully paid and 
nonassessable and not subject to preemptive or similar rights.

       (e)     Except as contemplated hereby or in the other Transaction 
Documents or as set forth in the Current SEC Reports, there are not any 
registration rights agreements, stockholder agreements, voting agreements or 
trusts, proxies or other agreements or contractual obligations to which the 
Company or any Subsidiary is a party or bound with respect to the 
registration with any Government Entity, or the voting or disposition of any 
Capital Stock of the Company or any of its Subsidiaries and, to the Company's 
Knowledge there are no other shareholder agreements, voting agreements or 
trusts, proxies or other agreements or contractual obligations among the 
shareholders of the Company with respect to the voting or disposition of any 
Capital Stock of the Company or any of its Subsidiaries.

       Section 3.4    AUTHORITY; NO VIOLATIONS; APPROVALS.

       (a)     The Board has approved this Agreement, the other Transaction 
Documents and the transactions contemplated hereby and thereby, and declared 
this Agreement, the other Transaction Documents and the transactions 
contemplated hereby and thereby to be in the best interests of the Company.  
The Board has approved the acquisition of the Shares and, upon any conversion 
of the Shares, the issuance of the Underlying Shares by Purchaser hereunder.  
The Company has all requisite 


                                      -11-
<PAGE>

corporate power and authority to enter into this Agreement and each of the 
other Transaction Documents and to consummate each of the transactions and 
perform each of the obligations contemplated hereby and thereby.  The 
execution and delivery of this Agreement and each of the other Transaction 
Documents and the consummation of each of the transactions and the 
performance of each of the obligations contemplated hereby and thereby have 
been duly authorized by all necessary corporate action on the part of the 
Company. This Agreement has been, and at or  prior to the Initial Closing the 
other Transaction Documents will be, duly executed and delivered by the 
Company and the Certificates of Designation have been duly adopted by the 
Board of Directors in accordance with applicable Law.  Each of the 
Certificates of Designation and, assuming this Agreement and each of the 
other Transaction Documents to which Purchaser is a party constitute the 
valid and binding obligations of Purchaser, this Agreement and each of the 
other Transaction Documents constitutes a valid and binding obligation of the 
Company enforceable in accordance with its terms, subject, as to 
enforceability, to bankruptcy, insolvency, reorganization, moratorium and 
other similar laws of general applicability relating to or affecting 
creditors' rights and to general principles of equity (regardless of whether 
such enforceability is considered in a proceeding in equity or at law).

       (b)     The execution and delivery of this Agreement and each of the 
other Transaction Documents does not, and the consummation of the 
transactions contemplated hereby and thereby and compliance with the 
provisions hereof and thereof will not, conflict with, require the consent of 
any other Person to or result in any violation of, or default (with or 
without notice or lapse of time, or both) under, or give rise to a right of 
termination, cancellation or acceleration of any material obligation or to 
the loss of any material benefit under, or give rise to a right of purchase 
under, result in the creation of any Lien upon any of the properties or 
assets of the Company or any of its Subsidiaries under, any provision of (A) 
the Certificate of Incorporation or Bylaws or any provision of the comparable 
organizational documents of any of the Company's Subsidiaries, (B) any loan 
or credit agreement, note, bond, mortgage, indenture, lease, instrument, 
permit, concession, franchise, license or other contract or agreement, 
arrangement or understanding to which the Company or any of its Subsidiaries 
is a party or otherwise is bound or by which any of them or their respective 
properties are bound or any existing Approval applicable to the Company or 
any of its Subsidiaries, (C) any joint venture or other ownership arrangement 
to which the Company or any of its Subsidiaries is a party or otherwise is 
bound or by which any of them or their respective properties are bound or (D) 
assuming the Approvals referred to in SECTION 3.4(c) are duly and timely 
obtained or made, any Law or Order applicable to the Company or any of its 
Subsidiaries or any of their respective properties or assets, other than, in 
the case of clause (B) (other than with respect to any material loan or 
credit agreement, note, bond, mortgage or indenture or any Material Contract 
or any plan or agreement providing for the payment of any benefit to 
directors, officers or employees of the Company or its subsidiaries), (C) or 
(D), any such conflicts, violations, defaults, rights, Liens or detriments, 
that, individually or in the aggregate, (x) have not had and could not 
reasonably be expected to have a Material Adverse Effect, (y) have not 
impaired and could not reasonably be expected to impair the ability of the 
Company to perform its obligations under any of the Transaction Documents in 
any material respect, and (z) have not and could not reasonably be expected 
to delay in any material respect or prevent the consummation of any of the 
transactions, or performance of the obligations, contemplated by any of the 
Transaction Documents.

       (c)     No Approval from any Governmental Entity is required by or with
respect to the Company or any of its Subsidiaries in connection with the
execution and delivery of this Agreement 


                                      -12-
<PAGE>

or any other Transaction Document by the Company or the consummation by the 
Company of the transactions contemplated hereby or thereby, except for:  (A) 
the filing of a notification report by the Company under the HSR Act and the 
expiration or termination of the applicable waiting period with respect 
thereto (which filing and expiration or termination are not required for the 
Initial Closing), (B) the filing of the Certificates of Designation in 
accordance with Section 103 of the Delaware General Corporation Law, and (C) 
any such Approvals the failure of which to be made or obtained (1) has not 
had and could not reasonably be expected to have a Material Adverse Effect, 
(2) has not impaired and could not reasonably be expected to impair the 
ability of the Company to perform its obligations under any of the 
Transaction Documents in any material respect and (3) have not and could not 
reasonably be expected to delay in any material respect or prevent the 
consummation of any of the transactions contemplated by any of the 
Transaction Documents.

       Section 3.5    SEC DOCUMENTS.

       (a)     The Company has made available to Purchaser a true and 
complete copy of each report, schedule, registration statement and definitive 
proxy statement filed by the Company with the SEC since May 31, 1997 (the 
"COMPANY SEC DOCUMENTS") including the Company 1998 Form 10-K, which are all 
the documents (other than preliminary materials) that the Company was 
required to file with the SEC since May 31, 1997.  As of their respective 
dates, the Company SEC Documents complied in all material respects with the 
requirements of the Securities Act, or the Exchange Act, as the case may be, 
and the rules and regulations of the SEC thereunder applicable to such 
Company SEC Documents, and none of the Company SEC Documents contained as of 
their respective dates any untrue statement of a material fact or omitted to 
state a material fact required to be stated therein or necessary to make the 
statements therein, in light of the circumstances under which they were made, 
not misleading.

       (b)     The financial statements of the Company included in the 
Company SEC Documents, including the notes and schedules thereto, complied as 
to form in all material respects with the rules and regulations of the SEC 
with respect thereto, were prepared in accordance with United States 
generally accepted accounting principles ("GAAP") applied on a consistent 
basis during the periods involved (except as may be indicated in the notes 
thereto or, in the case of the unaudited statements, as permitted by Rule 
10-01 of Regulation S-X of the SEC) and fairly present the consolidated 
financial position of the Company and its consolidated Subsidiaries as of 
their respective dates and the consolidated results of operations and the 
consolidated cash flows of the Company and its consolidated Subsidiaries for 
the periods presented therein in accordance with applicable requirements of 
GAAP (subject, in the case of the unaudited statements, to normal, recurring 
adjustments, none of which are material) applied on a consistent basis during 
the periods presented.

       Section 3.6    ABSENCE OF CERTAIN CHANGES OR EVENTS.

       (a)     Except as disclosed in the Current SEC Reports filed prior to 
the date of this Agreement or SCHEDULE 3.6 of the Company Disclosure 
Schedule, or except as contemplated by this Agreement, since May 31, 1998, 
each of the Company and its Subsidiaries have conducted their business only 
in the ordinary course of business consistent with past practice, and there 
has not been: (i) any declaration, setting aside or payment of any dividend 
or other distribution (whether in cash, stock or property) with respect to 
any Capital Stock of the Company; (ii) any split, combinations, 


                                      -13-
<PAGE>

reclassification or amendment of any term of any outstanding Capital Stock or 
other security of the Company or any of its Subsidiaries or (other than 
issuance of Common Stock upon the exercise of any Company Options) any 
issuance or the authorization of the issuance of any securities of the 
Company or any of its Subsidiaries, other than in connection with the 
transactions contemplated hereby; (iii) any repurchase, redemption or other 
acquisition by the Company or any Subsidiary of the Company of any 
outstanding Capital Stock or other securities of the Company or any 
Subsidiary of the Company, except as contemplated by the Stock Plans; (iv) 
(A) any grant by the Company or any of its Subsidiaries to any officer of the 
Company or any of its Subsidiaries of any increase in compensation, except 
for increases in the ordinary course of business consistent with past 
practice or as required under employment or other agreements or benefit 
arrangements in effect as of May 31, 1998, or (B) any grant by the Company or 
any of its Subsidiaries to any such officer of any increase in severance or 
termination pay, except as was required or provided for under any employment, 
severance, termination or other agreements or benefit arrangements in effect 
as of May 31, 1998; (v) except as required by a change in GAAP, any material 
change in accounting methods, principles or practices by the Company or any 
of its Subsidiaries; and (vi) any material casualties affecting the Company 
and its Subsidiaries, taken as a whole, or any material loss, damage or 
destruction to any of their properties or assets, whether covered by 
insurance or not.

       (b)     Except as disclosed in the Company's consolidated financial 
statements included in the Company 1998 Form 10-K, and the notes thereto, or 
as disclosed in the other Current SEC Reports, since May 31, 1998, there has 
not been any event, circumstance or fact that (x) has had or could reasonably 
be expected to have a Material Adverse Effect, (y) has impaired or could 
reasonably be expected to impair the ability of the Company to perform its 
obligations under any of the Transaction Documents in any material respect, 
or (z) could reasonably be expected to delay in any material respect or 
prevent the consummation of any of the transactions contemplated by any of 
the Transaction Documents.

       Section 3.7    NO UNDISCLOSED MATERIAL LIABILITIES.  Except as 
disclosed in SCHEDULE 3.7 of the Company Disclosure Schedule or the Company's 
financial statements included in the Company 1998 Form 10-K, and the notes 
thereto, or as disclosed in the other Current SEC Reports, there are no 
liabilities or obligations of the Company or any of its Subsidiaries of any 
kind whatsoever, whether accrued, contingent, absolute, determined, 
determinable or otherwise, other than:  (i) liabilities adequately provided 
for on the balance sheet of the Company dated as of May 31, 1998 (including 
the notes thereto) contained in the Company 1998 Form 10-K; (ii) liabilities 
incurred in the ordinary course of business consistent with past practice 
since May 31, 1998, which liabilities, individually or in the aggregate, 
could not reasonably be expected to have a Material Adverse Effect; (iii) 
liabilities arising under the Transaction Documents; and (iv) liabilities not 
required by GAAP to be recognized or disclosed on a consolidated balance 
sheet of the Company and its consolidated Subsidiaries or in the notes 
thereto, which liabilities, individually or in the aggregate, could not 
reasonably be expected to have a Material Adverse Effect.

       Section 3.8    NO DEFAULT.  Except as disclosed in SCHEDULE 3.8 of the 
Company Disclosure Schedule or in the Current SEC Reports, neither the 
Company nor any of its Subsidiaries is in default or violation (and no event 
has occurred which, with notice or the lapse of time or both, would 
constitute a default or violation) of any term, condition or provision of (i) 
the Certificate of Incorporation or Bylaws of the Company or the comparable 
organizational documents of any of its 


                                      -14-
<PAGE>

Subsidiaries, (ii) any loan or credit agreement, note, bond, mortgage, 
indenture, lease, instrument, permit, concession, franchise, license or any 
other contract, agreement, arrangement or understanding to which the Company 
or any of its Subsidiaries is a party or by which the Company or any of its 
Subsidiaries or any of their respective properties or assets is bound, or 
(iii) any Order or Law applicable to the Company or any of its Subsidiaries, 
except in the case of clause (ii) and (iii), for violations or defaults that, 
individually or in the aggregate, (x) have not had and could not reasonably 
be expected to have a Material Adverse Effect, (y) have not impaired and 
could not reasonably be expected to impair the ability of the Company to 
perform its obligations under any of the Transaction Documents in any 
material respect, and (z) have not and could not reasonably be expected to 
delay in any material respect or prevent the consummation of any of the 
transactions contemplated by any of the Transaction Documents.  Except as 
disclosed in SCHEDULE 3.8 of the Company Disclosure Schedule or in the 
Current SEC Reports, the Company and its Subsidiaries (i) are not in breach 
of or default under any covenant, including financial covenants, under 
agreements relating to money borrowed in excess of $5 million, and (ii) do 
not believe that it is reasonably likely that they will be in breach of or 
default under any covenant under any such agreement as of the next date on 
which they are required to be in compliance with any such covenants.

       Section 3.9    COMPLIANCE WITH APPLICABLE LAWS.

       (a)     The Company and each of its Subsidiaries has in effect all 
Approvals of all Governmental Entities necessary for the lawful conduct of 
their respective businesses, and there has occurred no default or violation 
(and no event has occurred which, with notice or the lapse of time or both, 
would constitute a default or violation) under any such Approval, except for 
failures to obtain, or for defaults or violations under, Approvals which 
failures, defaults or violations, individually or in the aggregate, (i) have 
not had and could not reasonably be expected to have a Material Adverse 
Effect, (ii) have not impaired and could not reasonably be expected to impair 
the ability of the Company to perform its obligations under any of the 
Transaction Documents in any material respect, and (iii) could not reasonably 
be expected to delay in any material respect or prevent the consummation of 
any of the transactions contemplated by any of the Transaction Documents.

       (b)     Except as otherwise disclosed in the Current SEC Reports, the 
Company and its Subsidiaries are in compliance with all applicable Laws and 
Orders, except for possible noncompliance which, individually or in the 
aggregate, (i) has not had and could not reasonably be expected to have a 
Material Adverse Effect, (ii) has not impaired and could not reasonably be 
expected to impair the ability of the Company to perform its obligations 
under any of the Transaction Documents in any material respect, and (iii) 
could not reasonably be expected to delay in any material respect or prevent 
the consummation of any of the transactions contemplated by any of the 
Transaction Documents.

       (c)     No investigation or review by any Governmental Entity with 
respect to the Company, any of its Subsidiaries or the transactions 
contemplated by this Agreement and the other Transaction Documents is pending 
or, to the Knowledge of the Company, threatened, nor has any Governmental 
Entity notified the Company or any of its Subsidiaries in writing or, to the 
Company's Knowledge, otherwise of any intention to conduct the same, other 
than those the outcome of which, individually or in the aggregate, (i) have 
not had and could not reasonably be expected to have a Material Adverse 
Effect, (ii) have not impaired and could not reasonably be expected to impair 
the ability of the 


                                      -15-
<PAGE>

Company to perform its obligations under any of the Transaction Documents in 
any material respect, or (iii) could not reasonably be expected to delay in 
any material respect or prevent the consummation of any of the transactions 
contemplated by any of the Transaction Documents.

       Section 3.10   LITIGATION.  Except as disclosed in the Current SEC 
Reports or SCHEDULE 3.10 of the Company Disclosure Schedule, there is no 
suit, action, proceeding or indemnification claim, at law or in equity, 
pending before any Governmental Entity or arbitrator, or, to the Knowledge of 
the Company, threatened, against or affecting the Company, any Subsidiary of 
the Company or any of its Material Contracts ("LITIGATION"), and neither the 
Company nor any Subsidiary is a party to any Litigation, that (i) has had or 
could reasonably be expected to have a Material Adverse Effect, (ii) has 
impaired or reasonably could be expected to impair the ability of the Company 
to perform its obligations under any of the Transaction Documents in any 
material respect, or (iii) reasonably could be expected to delay in any 
material respect or prevent the consummation of any of the transactions 
contemplated by any of the Transaction Documents, nor is there any Order of 
any Governmental Entity or arbitrator outstanding against or binding upon the 
Company or any Subsidiary of the Company or any of its Material Contracts 
which (i) has had or could reasonably be expected to have a Material Adverse 
Effect, (ii) has impaired or reasonably could be expected to impair the 
ability of the Company to perform its obligations under any of the 
Transaction Documents in any material respect, or (iii) reasonably could be 
expected to delay in any material respect or prevent the consummation of any 
of the transactions contemplated by any of the Transaction Documents.

       Section 3.11   CERTAIN AGREEMENTS.

       (a)     Except as disclosed in the Current SEC Reports and SCHEDULE 
3.11(a) of the Company Disclosure Schedule, there are no, whether in oral or 
written form, Contracts that are material to the Company and its 
Subsidiaries, taken as a whole, or their respective business, (such Contracts 
disclosed or required to be disclosed herein, in the Current SEC Reports or 
in the Company Disclosure Schedule, the "MATERIAL CONTRACTS").  Each Material 
Contract is a valid and binding obligation of the Company or one of its 
Subsidiaries and, to the Company's Knowledge, of each other party thereto, 
enforceable in accordance with its terms, and is in full force and effect.

       (b)     The Company or the relevant Subsidiary and, to the Company's 
Knowledge, each other party to the Material Contracts has performed in all 
material respects the obligations required to be performed by it under the 
Material Contracts and is not (with or without lapse of time or the giving of 
notice, or both) in breach or default thereunder.  No party to any Material 
Contract has given written or, to the Company's Knowledge, oral notice of any 
action to terminate, cancel, rescind or procure a judicial reformation 
thereof.

       Section 3.12   STATUS OF SHARES.  The issuance and sale of the Shares 
and the reservation and issuance of the Underlying Shares have been duly 
authorized by all necessary corporate action on the part of the Company 
(other than the filing of the respective Certificates of Designation with the 
Secretary of State of the State of Delaware) and the Shares, when delivered 
to Purchaser at the  Initial Closing or Option Closing, as applicable, 
against payment therefor as provided herein, and the Underlying Shares, when 
issued upon conversion of the Shares in accordance with the terms thereof, 
will be validly issued, fully paid and non-assessable and the issuance and 
sale of the Shares and the issuance of the Underlying Shares are not and will 
not be subject to preemptive rights of any Person.


                                      -16-
<PAGE>

       Section 3.13   INTELLECTUAL PROPERTY; YEAR 2000.  The Company and the 
Subsidiaries own, possess or license, or, to the Company's Knowledge can 
acquire on reasonable terms, adequate patents, patent rights, licenses, 
inventions, copyrights, know-how (including trade secrets and other 
unpatented and/or unpatentable proprietary or confidential information, 
systems or procedures), trademarks, service marks, trade names or other 
intellectual property (collectively, "INTELLECTUAL PROPERTY") necessary to 
carry on the business now operated by them, and neither the Company nor any 
of the Subsidiaries has received any notice or is otherwise aware of any 
infringement of or conflict with asserted rights of others with respect to 
any Intellectual Property (including Intellectual Property which is licensed) 
or of any facts or circumstances which would render any Intellectual Property 
invalid or inadequate to protect the interest of the Company or any of the 
Subsidiaries therein, and which infringement or conflict (if the subject of 
any unfavorable decision, ruling or finding) or invalidity or inadequacy, 
singly or in the aggregate, could reasonably be expected to result in a 
Material Adverse Effect.  The Company and its Subsidiaries have reviewed the 
areas within their business and operations and products (including computer 
software and hardware) which could be adversely affected by, and have 
developed or are developing programs to address on a timely basis, any "Year 
2000 Problem" (that is, the risk that computer hardware or software used by 
the Company and its Subsidiaries may be unable to recognize and perform 
properly date-sensitive functions involving certain dates prior to and any 
date after December 31, 1999).  Based on such review and program, the Company 
reasonably believes that any such "Year 2000 Problem" caused by its products 
or operations will not have a Material Adverse Effect.

       Section 3.14   ENVIRONMENTAL MATTERS.  Except for such matters as 
could not, singly or in the aggregate, reasonably be expected to result in a 
Material Adverse Effect, (A) neither the Company nor any of the Subsidiaries 
is in violation of any federal, state, local or foreign statute, law, rule, 
regulation, ordinance, code, policy or rule of common law or any judicial or 
administrative interpretation thereof, including any judicial or 
administrative order, consent, decree or judgment, relating to pollution or 
protection of human health, the environment (including, without limitation, 
ambient air, surface water, groundwater, land surface or subsurface strata) 
or wildlife, including, without limitation, laws and regulations relating to 
the release or threatened release of chemicals, pollutants, contaminants, 
wastes, toxic substances, hazardous substances, petroleum or petroleum 
products (collectively, "HAZARDOUS MATERIALS") or to the manufacture, 
processing, distribution, use, treatment, storage, disposal, transport or 
handling of Hazardous Materials (collectively, "ENVIRONMENTAL LAWS"), (B) the 
Company and the Subsidiaries have all permits, authorizations and approvals 
required under any applicable Environmental Laws and are each in compliance 
with their requirements, (C) there are no pending or, to the Company's 
Knowledge or any of the Subsidiaries, threatened administrative, regulatory 
or judicial actions, suits, demands, demand letters, claims, liens, notices 
of noncompliance or violation, investigation or proceedings relating to any 
Environmental Law against the Company or any of the Subsidiaries and (D) 
there are no events or circumstances known to the Company or any of the 
Subsidiaries that might reasonably be expected to form the basis of an order 
for clean-up or remediation, or an action, suit or proceeding by any private 
party or governmental body or agency, against or affecting the Company or any 
of the Subsidiaries relating to Hazardous Materials or Environmental Laws.

       Section 3.15   NO BROKERS OR FINDERS.  No agent, broker, finder or
investment or commercial banker, or other Person or firm engaged by or acting on
behalf of the Company or its Subsidiaries in connection with the negotiation,
execution or performance of this Agreement is or will be entitled to 


                                      -17-
<PAGE>

any brokerage or finder's or similar fee or other commission as a result of 
this Agreement, the other Transaction Documents or the transactions 
contemplated hereby or thereby, other than any such fees or commissions that 
have been disclosed to Purchaser and as to which the Company shall have full 
responsibility.

       Section 3.16   VOTE.  There are no approvals required of the holders 
of any class or series of shares or stock of the Company necessary to approve 
this Agreement or any other Transaction Documents and the transactions 
contemplated hereby or thereby.

       Section 3.17   RELATED PARTY TRANSACTIONS. No relationship, direct or 
indirect, exists between or among any of the Company, the Subsidiaries or any 
affiliate of the Company, on the one hand, and any director, officer, 
stockholder, customer or supplier of any of them, on the other hand, which 
would be required by the Exchange Act or by the rules and regulations enacted 
thereunder to be described in the Company's proxy statement for the election 
of directors in 1999 which is not described in the Current SEC Reports or 
SCHEDULE 3.17 of the Company Disclosure Schedule.

       Section 3.18   CERTAIN ANTI-TAKEOVER PROVISIONS; RIGHTS PLAN. The 
Board of Directors of the Company has duly approved the Purchaser and its 
Affiliates becoming an "interested stockholder" within the meaning of Section 
203 of the Delaware General Corporation Law and a "Related Person" within the 
meaning of Article THIRTEENTH of the Certificate of Incorporation by reason 
of the acquisition by Purchaser or any of its Affiliates of (i) the Shares, 
(ii) the Underlying Shares, (iii) any shares of Common Stock permitted to be 
acquired by Purchaser or any of its Affiliates in accordance with the 
limitation set forth in SECTION 5.12(a) or (iv) any securities (including 
shares of Common Stock issuable upon conversion, exercise or exchange thereof 
pursuant to their terms) received by Purchaser or its Affiliates pursuant to 
SECTION 5.11 (collectively, the "SHARE ACQUISITIONS"), and has otherwise 
taken all action necessary to exempt the Share Acquisitions from the 
application of Section 203 of the Delaware General Corporation Law, Article 
THIRTEENTH of the Certificate of Incorporation, or any similar anti-takeover 
provisions of Law or otherwise that could adversely affect the rights of the 
Purchaser or its Affiliates with respect to their ownership of securities 
acquired by means of such Share Acquisitions.   In addition, the Company has 
amended the Rights Plan to provide that neither Purchaser nor any of its 
Affiliates will be deemed to be an Acquiring Person within the meaning of the 
Rights Plan by reason of the Share Acquisitions.  

                                 ARTICLE IV.
                 REPRESENTATIONS AND WARRANTIES OF PURCHASER
                                          
       Purchaser represents and warrants to the Company as follows:

       Section 4.1    ORGANIZATION, STANDING AND POWER.  Purchaser is a 
limited partnership duly organized, validly existing, and in good standing 
under the laws of Delaware and has all requisite partnership power and 
authority to own, lease, and operate its properties and to carry on its 
business as now being conducted and to execute and deliver this Agreement and 
the other Transaction Documents to which Purchaser is a party and consummate 
the transactions contemplated hereby and thereby.


                                      -18-
<PAGE>

       Section 4.2    AUTHORITY; APPROVALS.

       (a)     (i) The execution and delivery of this Agreement and the other 
Transaction Documents to which it is a party and the purchase of the Shares 
to be purchased by it have been duly and properly authorized by all necessary 
partnership action on the part of Purchaser, (ii) this Agreement and the 
other Transaction Documents to which it is a party have been duly executed 
and delivered by it or on its behalf and, assuming the accuracy of the 
representations and warranties of the Company in SECTION 3.4 hereof, 
constitute the valid and legally binding obligations of Purchaser, 
enforceable against it in accordance with their respective terms, subject to 
bankruptcy, insolvency, reorganization, moratorium and other similar laws of 
general applicability relating to or affecting creditors' rights and to 
general principles of equity (regardless of whether such enforceability is 
considered in a proceeding in equity or at law); (iii) the purchase of the 
Shares to be purchased by it does not conflict with or violate (1) its 
organizational documents or any other material agreement to which it is a 
party or to which its properties are subject or (2) assuming the approvals 
referred to in SECTION 4.2(b) are duly and timely made or obtained, any Law 
applicable to it, in each case in a manner that could reasonably be expected 
to materially hinder or impair the completion of any of the transactions 
contemplated hereby; and (iv) the purchase of Shares to be purchased by it 
does not impose any penalty or other onerous condition on Purchaser that 
could reasonably be expected to materially hinder or impact the completion of 
any of the transactions contemplated hereby.

       (b)     No Approval from any Governmental Entity is required by or 
with respect to Purchaser in connection with the execution and delivery by 
Purchaser of this Agreement or any other Transaction Document to which it is 
a party or the consummation by Purchaser of the transactions contemplated 
hereby or thereby, except for:  (A) the filing of a notification report by 
Purchaser under the HSR Act, and the expiration or termination of the 
applicable waiting period with respect thereto (which filing and expiration 
or termination are not required for the Initial Closing); and (B) any such 
Approval the failure of which to be made or obtained (1) has not impaired and 
could not reasonably be expected to impair the ability of Purchaser to 
perform its obligations under any of the Transaction Documents in any 
material respect and (2) could not reasonably be expected to delay in any 
material respect or prevent the consummation of any of the transactions 
contemplated by any of the Transaction Documents.

       Section 4.3    INVESTMENT INTENT.  The Shares to be acquired by it 
hereunder and any Underlying Shares to be acquired upon the conversion of 
such Shares are being, or in the case of the Underlying Shares, will be, 
acquired for its own account for investment and with no intention of 
distributing or reselling such Shares or Underlying Shares or any part 
thereof or interest therein in any transaction which would be in violation of 
the securities Laws of the United States of America or any applicable state 
or any foreign country or jurisdiction.

       Section 4.4    PURCHASER STATUS.  Purchaser represents and warrants 
to, and covenants and agrees with the Company that (i) at the time it was 
offered the Shares, it was, (ii) at the date hereof, it is, and (iii) at the 
Initial Closing Date and the Option Closing Date (if any), it will be, an 
accredited investor as defined in Rule 501(a) under the Securities Act, and 
has such knowledge, sophistication and experience in business and financial 
matters so as to be capable of evaluating the Company and an investment in 
the Shares, and is able to bear the economic risk of such investment.


                                      -19-

<PAGE>

       Section 4.5    NO BROKERS OR FINDERS.  No agent, broker, finder or 
investment or commercial banker, or other Person or firm engaged by or acting 
on behalf of Purchaser in connection with the negotiation, execution or 
performance of this Agreement is or will be entitled to any brokerage or 
finder's or similar fee or other commission as a result of this Agreement, 
other than any such fees or commissions that have been disclosed to the 
Company and as to which Purchaser shall have full responsibility.

       Section 4.6    ACCESS TO INFORMATION.  Purchaser represents and 
acknowledges that it (a) has had access to and the opportunity to review the 
Company's properties, assets, financial statements, contracts and other books 
and records and has made such investigation with respect thereto as it deems 
necessary to enter into the transactions contemplated hereby, (b) has been 
afforded the opportunity to ask appropriate representatives of the Company 
questions concerning the business, assets, financial condition and prospects 
of the Company and (c) has been solely responsible for its own due diligence 
investigation of the Company and its business, for its own analysis of the 
merits and risks of an investment in the Shares, and for its own analysis of 
the terms of the investment in the Shares.  Anything herein to the contrary 
notwithstanding, the provisions of this SECTION 4.6 shall not in any way 
limit any of the representations and warranties of the Company set forth in 
this Agreement or in any Schedule delivered pursuant hereto by the Company or 
its authorized representatives or the rights of Purchaser with respect to any 
breach of any such representations and warranties.

                                  ARTICLE V.
                                  COVENANTS
                                          
       Section 5.1    AFFIRMATIVE COVENANTS OF THE COMPANY.  The Company 
hereby covenants and agrees that, until the earlier of the Initial Closing or 
the termination of this Agreement, unless otherwise expressly contemplated by 
this Agreement or consented to in writing by Purchaser (such consent not to 
be unreasonably withheld), the Company will and will cause each of its 
Subsidiaries to operate its business in the usual and ordinary course 
consistent with past practices except as contemplated by this Agreement and 
except as set forth in SCHEDULE 5.1 of the Company Disclosure Schedule.

       Section 5.2    NEGATIVE COVENANTS OF THE COMPANY.

       (a)     Except as expressly contemplated by this Agreement or 
otherwise consented to in writing by Purchaser, from the date of this 
Agreement until earlier of the Initial Closing or the termination of this 
Agreement, the Company shall not do, and shall not permit any of its 
Subsidiaries to do, any of the following:

               (i)    adopt or propose to adopt any amendments to the Company's
       Certificate of Incorporation or Bylaws, adopt resolutions authorizing a
       liquidation, dissolution, merger, consolidation, restructuring,
       recapitalization, or other reorganization of the Company or any
       Subsidiary or make any other changes in the Company's capital structure;

               (ii)   declare or pay any dividend or make any other
       distribution (whether in cash, stock or property) with respect to its
       Capital Stock, other than dividends paid by any Subsidiary to the
       Company or another Subsidiary in the ordinary and usual course of the


                                      -20-
<PAGE>

       Company's business, or take any other action that, if taken after the
       issuance of the Shares, would result in an adjustment to the number of
       shares acquirable upon conversion of the Shares;

               (iii)  take any action that will, or is reasonably likely to
       cause, the condition in Section 6.2(a) not to be satisfied; or

               (iv)   agree in writing or otherwise to do any of the foregoing.

       Section 5.3    COOPERATION; APPROVALS.  The Company and Purchaser each 
agrees to cooperate and use all commercially reasonable efforts to take, or 
cause to be taken, all action and to do, or cause to be done, all things 
necessary, proper or advisable to consummate and make effective the 
transactions contemplated by this Agreement, including cooperating fully with 
the other parties to obtain (and will promptly prepare all registrations, 
filings and applications, requests and notices preliminary to) all Approvals 
that may be necessary or which may be reasonably requested by the Company or 
Purchaser to consummate the transactions contemplated by this Agreement and 
the other Transaction Documents.  In case at any time after the date hereof 
any further action is necessary or desirable to carry out the purposes of 
this Agreement, the parties shall take all such necessary action.  

       Section 5.4    HSR ACT NOTIFICATION.  Each of the parties hereto shall 
(a) file or cause to be filed, as promptly as practicable after the execution 
and delivery of this Agreement, with the Federal Trade Commission and the 
United States Department of Justice, all reports and other documents required 
to be filed by such party under the HSR Act concerning the transactions 
contemplated hereby and (b) promptly comply with or cause to be complied with 
any requests by the Federal Trade Commission or the United States Department 
of Justice for additional information concerning the transactions 
contemplated by this Agreement, in each case so that the waiting period 
applicable to this Agreement and the transaction contemplated hereby under 
the HSR Act shall expire as soon as practicable after the execution and 
delivery of this Agreement. Each party hereto agrees to request, and to 
cooperate with the other party or parties in requesting, early termination of 
any applicable waiting period under the HSR Act.  If after the Initial 
Closing or Option Closing and until the date on which the Shares are fully 
converted in accordance with their terms, further filings are required under 
the HSR Act so that Purchaser may acquire the Underlying Shares or otherwise 
acquire securities pursuant to the Transaction Documents, the Company will 
upon the written request of Purchaser, and Purchaser will upon the written 
request of the Company, (i) file or cause to be filed, as promptly as 
practicable after the receipt of such notice and in no event later than 
fifteen Business Days after the receipt of such notice with the Federal Trade 
Commission and the United States Department of Justice, all reports and other 
documents required to be filed by such party under the HSR Act concerning the 
transactions contemplated in such notice, (ii) promptly comply with or cause 
to be complied with any requests by the Federal Trade Commission or the 
United States Department of Justice for additional information so that the 
waiting period applicable thereto under the HSR Act shall expire as soon as 
practicable, and (iii) cooperate with the other Parties in requesting, early 
termination of any applicable waiting period under the HSR Act.  The Company 
will reimburse Purchaser for any filing fees in connection with such filings 
by Purchaser.


                                      -21-
<PAGE>

       Section 5.5    NOTIFICATION OF CERTAIN MATTERS.  The Company shall 
give prompt notice to Purchaser, and Purchaser shall give prompt notice to 
the Company, of (a) the occurrence, or failure to occur, of any event that 
causes any representation or warranty contained in any Transaction Document 
to be untrue or inaccurate in any material respect at any time from the date 
of this Agreement to the Initial Closing Date and (b) any failure of the 
Company or Purchaser to comply with or satisfy, in any material respect, any 
covenant, condition or agreement to be complied with or satisfied by it under 
any Transaction Document.  The provisions of this SECTION 5.5 shall survive 
for so long as any representation, warranty, covenant, or agreement shall 
survive hereunder.

       Section 5.6    BOARD OF DIRECTORS.  The Company shall use its best 
efforts to take, or cause to be taken, such action as may be necessary or 
advisable to ensure that immediately following the later of (i) the Initial 
Closing and (ii) the expiration or termination of the applicable waiting 
period under the HSR Act, the Board shall be increased by one (if necessary) 
and the individual identified by Purchaser to the Company shall be elected as 
a director of the Company in accordance with the terms of the Shares.

       Section 5.7    REGISTRATION RIGHTS AGREEMENT.  At the Closing, the 
Company agrees to enter into a Registration Rights Agreement in substantially 
the form attached hereto as EXHIBIT 5.7.

       Section 5.8    TRANSFER RESTRICTIONS.  (a)  If Purchaser should decide 
to dispose of any of the Shares to be purchased by it or any Underlying 
Shares to be issued to it upon the conversion of such Shares, Purchaser 
understands and agrees that it may do so only pursuant to an effective 
registration statement under the Securities Act or pursuant to an exemption 
from registration under the Securities Act.  In connection with any offer, 
resale, pledge or other transfer (individually and collectively, a 
"TRANSFER") of any Shares or Underlying Shares other than pursuant to an 
effective registration statement, the Company may require that the transferor 
of such Shares or Underlying Shares provide to the Company an opinion of 
counsel which opinion shall be reasonably satisfactory in form and substance 
to the Company, to the effect that such Transfer is being made pursuant to an 
exemption from, or in a transaction not subject to, the registration 
requirements of the Securities Act and any applicable state or foreign 
securities Laws.  Purchaser agrees to the imprinting, so long as appropriate, 
of substantially the following legend on certificates representing the Shares 
and any Underlying Shares:

               THE SECURITIES (THE "SECURITIES") EVIDENCED HEREBY HAVE NOT 
       BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE 
       "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT 
       AS SET FORTH IN THE FOLLOWING SENTENCE.  BY ITS ACQUISITION HEREOF, 
       THE HOLDER AGREES THAT IT WILL NOT OFFER, RESELL, PLEDGE OR OTHERWISE 
       TRANSFER (INDIVIDUALLY AND COLLECTIVELY, A "TRANSFER") THE SECURITIES 
       EVIDENCED HEREBY, EXCEPT (A) PURSUANT TO AN EFFECTIVE REGISTRATION 
       STATEMENT UNDER THE SECURITIES ACT, OR (B) PURSUANT TO AN EXEMPTION 
       FROM REGISTRATION UNDER THE SECURITIES ACT.  IF THE PROPOSED TRANSFER 
       IS TO BE MADE OTHER THAN PURSUANT TO CLAUSE (A) ABOVE, THE HOLDER 
       MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE COMPANY AND THE TRANSFER 
       AGENT SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS THEY 
       MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE 
       PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE 
       REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OR ANY STATE OR 
       FOREIGN SECURITIES LAW.


                                      -22-
<PAGE>

       The legend set forth above may be removed if and when the Shares or 
Underlying Shares, as the case may be, represented by such certificate are 
disposed of pursuant to an effective registration statement under the 
Securities Act or the opinion of counsel referred to above has been provided 
to the Company.  The Share certificates shall also bear any additional 
legends required by applicable federal, state or foreign securities Laws, 
which legends may be removed when, in the opinion of counsel to the Company, 
the same are no longer required under the applicable requirements of such 
securities Laws.  Purchaser agrees that, in connection with any Transfer of 
Shares by it pursuant to an effective registration statement under the 
Securities Act, it will comply with all prospectus delivery requirements of 
the Securities Act. The Company makes no representation, warranty or 
agreement as to the availability of any exemption from registration under the 
Securities Act with respect to any resale of Shares or Underlying Shares.

       (b)     Purchaser agrees that, without the prior written consent of 
the Company, it will not sell or otherwise transfer any Shares to any other 
person or entity other than a partner of Purchaser, who, in any event, shall 
agree to be bound by this SECTION 5.8(b), it being understood that the 
foregoing provision shall not apply to Underlying Shares.  Purchaser agrees 
to the imprinting of the following legend on certificates representing the 
Shares to indicate the foregoing restriction:

               THE SECURITIES EVIDENCED HEREBY ARE SUBJECT TO CERTAIN 
       RESTRICTIONS ON TRANSFER SET FORTH IN THE PURCHASE AGREEMENT DATED AS 
       OF [DATE] AMONG THE COMPANY AND SCF-IV, L.P., A COPY OF WHICH IS 
       AVAILABLE FOR INSPECTION AT THE PRINCIPAL OFFICES OF THE COMPANY.  

       (c)     Purchaser agrees that, without the prior written consent of 
the Company, it will not, prior to the earlier of (i) the seventh anniversary 
of the Initial Closing, or (ii) the occurrence of a Change of Control, sell 
or otherwise transfer any Underlying Shares in a single transaction or series 
of related transactions involving a number of shares in the aggregate 
constituting in excess of 1% of the Company's issued and outstanding shares 
of Common Stock at the time of such sale or transfer (based on the Company's 
most recent Exchange Act report filed with the SEC prior to such sale or 
transfer disclosing such number of outstanding shares) to any entity which 
Purchaser knows competes to a material extent with the Company or is engaged 
to a material extent in the energy services or equipment business (an 
"Industry Party"), without first offering such shares to the Company on the 
same terms; PROVIDED that if the Purchaser is selling such shares pursuant to 
an underwritten offering, such sale shall be deemed to comply with the 
foregoing limitation so long as the managing underwriter advises the 
Purchaser and the Company that, based on a reasonable inquiry of all persons 
to whom shares are being sold in an amount exceeding the 1% limitation 
described above (other than financial or insurance institutions, pension 
plans or funds or registered investment companies), no such proposed 
purchaser is an Industry Party.  If, upon receiving an offer pursuant to the 
foregoing sentence, the Company does not notify Purchaser that it wishes to 
purchase the offered shares within 20 Business Days of receiving such offer, 
Purchaser may sell such shares on the terms set forth in the offer within six 
months thereof, provided that the purchaser thereof agrees to a standstill 
agreement substantially similar to that set forth in SECTION 5.12 with an 18 
month term from the date of such purchaser's acquisition.  If the Company 
does notify Purchaser that it intends to purchase the offered shares, it 
shall deliver payment for such shares (against delivery of the certificates 
therefor) within five Business Days of giving such notice.


                                      -23-
<PAGE>

       Section 5.9    STOCK EXCHANGE LISTING.  Prior to the time the Shares 
become convertible in accordance with their terms, the Company shall, at its 
expense, procure the listing of the Underlying Shares on all stock exchanges 
on which the Common Stock is then listed. 

       Section 5.10   ACCESS; CONFIDENTIALITY.  

       (a)     At all times during normal business hours from and after the 
date hereof until all of the outstanding Shares have been converted in 
accordance with their terms, the Company shall afford Purchaser and its 
counsel and other authorized representatives reasonable access to the 
properties, employees and officers of the Company and to all books, accounts, 
tax returns, financial and other records, including audit work papers, 
correspondence and contracts of every kind of the Company as Purchaser may 
reasonably request.

       (b)     Purchaser shall, and shall cause its representatives to, hold 
confidential all information relating to the Company or its Subsidiaries it 
has received prior to the Initial Closing from the Company or any of its 
representatives, or information, if any, it receives after the Initial 
Closing from the Company or any of its representatives as a result of or in 
connection with SECTION 5.10(a) hereof or Purchaser's ownership of the 
Shares; PROVIDED, HOWEVER, that the foregoing shall not apply to (i) 
information that is or becomes generally available to the public other than 
as a result of a disclosure by Purchaser or any of its Affiliates or 
representatives in violation of this SECTION 5.10(b), (ii) information that 
is or becomes available to Purchaser or any of its representatives on a 
nonconfidential basis from a source other than the Company or its Affiliates 
or representatives, provided that such source is not known by Purchaser to be 
bound by a confidentiality agreement with or other obligation of secrecy to 
the Company or any other party, or (iii) information that is required to be 
disclosed by Purchaser or any of its representatives as a result of any 
applicable Law; PROVIDED FURTHER, however, that in the event information is 
required to be disclosed pursuant to clause (iii), the Person proposing such 
disclosure shall provide the Company to the extent practicable an 
opportunity, reasonably in advance of any such disclosure, to review and 
comment on the form and content of such proposed disclosure.  The provisions 
of this SECTION 5.10(b) shall terminate on the first anniversary of the date 
that all of the outstanding Shares have been converted in accordance with 
their terms.

       Section 5.11   ISSUANCE OF ADDITIONAL PREFERRED STOCK.   

       (a)     The Company agrees that, from and after the date of this 
Agreement, it will not issue any Permitted Parity Securities (as defined in 
the Certificate of Designation for the Series B Preferred Stock), except for 
(i) the issuance of the Option Shares to Purchaser or its Affiliate pursuant 
to this Agreement, or (ii) the issuance of a number of shares of Permitted 
Parity Securities issued at a price of $1,000 cash per share in a single 
series within eighteen months of the Initial Closing equal to 35,000 less the 
number of Option Shares purchased hereunder (or, if the option period 
referred to in SECTION 2.2(a) shall not yet have expired, less the full 
15,000 Option Shares); PROVIDED that if such Permitted Parity Securities are 
issued after the first anniversary of the Initial Closing, then Purchaser 
shall be entitled to prior written notice of such proposed issuance and the 
terms thereof and shall have a right of first refusal option to purchase any 
or all of such securities on the same terms as offered to the proposed 
purchaser, which option may be exercised by Purchaser by notice to the 
Company at any time during the 20 Business Days following the receipt of the 
Company's notice.  If Purchaser elects to exercise such option, the closing 
for such purchase shall be at a time to be mutually agreed 


                                      -24-
<PAGE>

between the Company and Purchaser but not later than the 15th day following 
the receipt of any required regulatory approvals.  If Purchaser does not 
elect to exercise such option within the 20 Business Day period (or the 
closing of the exercise of such option does not occur within the period 
described in the previous sentence for any reason not caused by the Company), 
the Company may sell such securities on the terms set forth in its notice, 
but only until the expiration of the eighteen month period specified in 
clause (ii) above.

       (b)     The Company agrees that if it issues any Permitted Parity 
Securities (other than Option Shares) pursuant to the foregoing that have 
terms that the Purchaser reasonably believes to be more favorable to the 
purchaser thereof than the terms of the Initial Shares, then the Purchaser 
shall have the right to exchange all of the Shares purchased hereunder (or, 
if such issuance occurs prior to the expiration of the option period 
specified in SECTION 2.2(a) and the Option Closing has not occurred, all of 
the Shares that may be purchased hereunder if Purchaser agrees to pay the 
applicable purchase price therefor upon such exchange) on a share for share 
basis.  
       
       Section 5.12   STANDSTILL AGREEMENT.   Purchaser hereby agrees that, 
for a period commencing on the date hereof and ending on the earlier of the 
third anniversary of the Initial Closing or the occurrence of a Change of 
Control, it will not:

       (a)     directly or indirectly, take any action to acquire, in the 
aggregate, beneficial ownership of more than 4% of the Company's outstanding 
Common Stock or Voting Stock (based on the Company's most recent Exchange Act 
report filed with the SEC prior to such acquisition disclosing such number of 
outstanding shares), excluding from such ownership the Shares or the 
Underlying Shares or any other Common Stock or Voting Stock acquired directly 
from the Company; 

       (b)     form or encourage the formation of a "group" within the 
meaning of Section 13(d)(3) of the Exchange Act to acquire, change or 
influence control of the Company;

       (c)     solicit, or participate in any "solicitation" of "proxies" or 
become a "participant" in any "election contest" or consent solicitation (as 
such terms are defined or used under Regulation 14A under the Exchange Act) 
with respect to the Company in opposition to the recommendation of a majority 
of the Board; 

       (d)     initiate, propose or otherwise solicit stockholders for the 
approval of, one or more stockholder proposals with respect to the Company or 
induce any Person to initiate any stockholder proposal, in each case in 
opposition to the recommendation of a majority of the Board;

       (e)     deposit any Voting Stock in a voting trust or subject them to 
a voting agreement or other agreement or arrangement with respect to the 
voting of such Voting Stock, other than any such trust, agreement or other 
arrangement involving no Persons other than the Purchaser, its partners or 
Affiliates of Purchaser; or

       (f)     solicit, propose or negotiate with any other Person (including 
the Company) with respect to any form of Business Combination or other 
extraordinary transaction with the Company or any of its Subsidiaries, in 
each case which would result in a Change of Control, or solicit, make or 
propose or negotiate with any other Person with respect to or announce an 
intent to make, any 


                                      -25-
<PAGE>

tender offer or exchange offer for any securities of the Company, in each 
case in opposition to the recommendation of a majority of the Board, or 
publicly disclose an intent, purpose, plan or proposal with respect to the 
Company, any of its Subsidiaries, or any securities or assets of the Company, 
that would violate the provisions of this SECTION 5.12(f); 

PROVIDED, however, that nothing in this SECTION 5.12 shall be deemed to limit 
in any way (i) the right of Purchaser to exercise its voting rights in any 
manner it sees fit with respect to the Shares, the Underlying Shares or any 
other shares of Voting Stock acquired by Purchaser in accordance with this 
Agreement, or (ii) the right of any director elected to the Board as a 
representative of the holders of the Shares to take any action he believes 
necessary to fulfill his fiduciary duties.

       Section 5.13   INDEMNIFICATION.   

       (a)     The Company agrees to indemnify the Purchaser and its 
Affiliates and hold the Purchaser and its Affiliates harmless from and 
against any and all liabilities, losses, damages, costs and expenses of any 
kind (including, without limitation, the reasonable fees and disbursements of 
Purchaser's counsel in connection with any investigative, administrative or 
judicial proceeding), which may be incurred by Purchaser or such Affiliates 
as a result of any claims made against Purchaser or such Affiliates by any 
Person that relate to or arise out of (i) any breach by the Company of any of 
its representations, warranties or covenants contained in this Agreement or 
in the Transaction Documents, or (ii) any litigation, investigation or 
proceeding instituted by any Person with respect to this Agreement or the 
Shares or Underlying Shares (excluding, however, any such litigation, 
investigation or proceeding which arises solely from the acts or omissions of 
Purchaser or its Affiliates).  Notwithstanding anything to the contrary 
above, it is expressly understood between the parties hereto that the Company 
pursuant to this SECTION 5.13 shall not be responsible for or assume any of 
the investment risk associated with any securities purchased hereunder.

       (b)       Any Person entitled to indemnification hereunder will (i) 
give prompt notice to the Company of any claim with respect to which it seeks 
indemnification (but omission of such notice shall not relieve the Company 
from liability hereunder except to the extent it is actually prejudiced by 
such failure to give notice) and (ii) unless in such indemnified party's 
reasonable judgment a conflict of interest may exist between such indemnified 
party and the Company with respect to such claim, permit the Company to 
assume the defense of such claim with counsel reasonably satisfactory to the 
indemnified party.  If such defense is not assumed by the Company, the 
Company will not be subject to any liability for any settlement made without 
its consent (but such consent will not be unreasonably withheld).  The 
Company will not consent to entry of any judgment or enter into any 
settlement which does not include as an unconditional term thereof the giving 
by the claimant or plaintiff to such indemnified party of an unconditional 
release from all liability in respect to such claim or litigation.  If the 
Company elects not to or is not entitled to assume the defense of a claim, it 
will not be obligated to pay the fees and expenses of more than one counsel 
for all parties indemnified with respect to such claim, unless an actual 
conflict of interest exists between such indemnified party and any other of 
such indemnified parties with respect to such claim, in which event the 
Company will be obligated to pay the fees and expenses of such additional 
counsel or counsels.


                                      -26-
<PAGE>

       Section 5.14   RIGHTS PLAN.   The Company will not further amend the 
Rights Plan, or adopt any similar rights plan or rights agreement, in a 
manner that conflicts with, or restricts the Purchaser to a greater extent 
than, the provisions hereof, including the representation set forth in 
SECTION 3.18.

                                 ARTICLE VI.
                     CONDITIONS PRECEDENT TO THE CLOSINGS
                                          
       Section 6.1    CONDITIONS PRECEDENT TO EACH PARTY'S OBLIGATION.  The 
respective obligations of Purchaser and the Company to effect the 
transactions contemplated hereby at each Closing are subject to the 
satisfaction on or prior to the applicable Closing Date of the following 
conditions:

       (a)     APPROVALS.  All Approvals of, or expirations of waiting 
periods imposed by, any Governmental Entity necessary for the consummation of 
the transactions contemplated by this Agreement at such Closing shall have 
been filed, occurred, or been obtained, as applicable.

       (b)     NO INJUNCTIONS OR RESTRAINTS.  No temporary restraining order, 
preliminary or permanent injunction, or other order issued by any court of 
competent jurisdiction or other legal restraint or prohibition preventing the 
consummation of the transactions contemplated hereby shall be in effect.

       (c)     NO ACTION.  No action shall have been taken nor any statute, 
rule, or regulation shall have been enacted by any Governmental Entity that 
makes the consummation of the transactions contemplated hereby illegal.

       Section 6.2    CONDITIONS PRECEDENT TO OBLIGATION OF PURCHASER.  The 
obligation of Purchaser to effect the transactions contemplated by this 
Agreement at each Closing is subject to the satisfaction of the following 
conditions unless waived, in whole or in part, by Purchaser:

       (a)     REPRESENTATIONS AND WARRANTIES.  The representations and 
warranties of the Company set forth in this Agreement that are qualified by a 
materiality standard or a Material Adverse Effect qualification shall be true 
and correct in all respects and the representations and warranties of the 
Company set forth in this Agreement that are not so qualified shall be true 
and correct in all material respects, in each case as of the date of this 
Agreement and as of the applicable Closing Date as though made on and as of 
the applicable Closing Date, and Purchaser shall have received a certificate 
to the foregoing effect signed on behalf of the Company and its Subsidiaries 
by the chief executive officer or by the chief financial officer of the 
Company.

       (b)     PERFORMANCE OF OBLIGATIONS.  The Company and its Subsidiaries 
shall have performed in all material respects all obligations required to be 
performed by it or them under this Agreement prior to the applicable Closing 
Date, and Purchaser shall have received a certificate to such effect signed 
on behalf of the Company and its Subsidiaries by the chief executive officer 
or by the chief financial officer of the Company.

       (c)     NO ADVERSE ACTION OR DECISION.  There shall be no action, 
suit, investigation or proceeding, pending or threatened, against or 
affecting the Company or any of its Subsidiaries or any of their respective 
properties or rights, or any of their Affiliates, officers or directors, 
before any 


                                      -27-
<PAGE>

court, arbitrator or administrative or governmental body which (i) seeks to 
restrain, enjoin or prevent the consummation of or otherwise affect the 
transactions contemplated by this Agreement or the other Transaction 
Documents or (ii) questions the validity or legality of any such transaction 
or seeks to recover damages or to obtain other relief in connection with any 
such transaction.

       (d)     CONSENTS UNDER AGREEMENTS.  Purchaser shall have been 
furnished with evidence of all consents or approvals required to be obtained 
by the Company or any of its Subsidiaries with respect to the consummation of 
each of the transactions contemplated by this Agreement the failure of which 
to obtain reasonably could be expected to result in a Material Adverse 
Effect, and each such consent or approval shall be unconditional.

       (e)     LEGAL OPINIONS.  At the Initial Closing, Purchaser shall have 
received from Haynes  and Boone, LLP an opinion dated the Initial Closing 
Date, in the form of EXHIBIT 6.2(e)(i) and, at the Option Closing, Purchaser 
shall have received from Haynes and Boone, LLP, an opinion dated the Option 
Closing Date, in the form of EXHIBIT 6.2(e)(ii). 

       (f)     HSR FILINGS.  The Company shall have filed all reports 
required to be filed by the Company under the HSR Act concerning the 
transactions contemplated hereby.

       (g)     CLOSING DELIVERIES.  All documents, instruments, certificates 
or other items required to be delivered by the Company pursuant to SECTION 
7.2(b), in the case of the Initial Closing, or SECTION 7.3(b), in the case of 
the Option Closing, shall have been delivered.

       (h)     CERTIFICATE OF DESIGNATION.  The Certificate of Designation 
relating to the Series B Preferred Stock, in the case of the Initial Closing, 
and the Series C Preferred Stock, in the case of the Option Closing, shall 
have been filed with the Delaware Secretary of State.

       Section 6.3    CONDITIONS PRECEDENT TO OBLIGATIONS OF COMPANY.  The 
obligation of the Company to effect the transactions contemplated by this 
Agreement at each Closing is subject to the satisfaction of the following 
conditions unless waived, in whole or in part, by the Company:

       (a)     REPRESENTATIONS AND WARRANTIES.  The representations and 
warranties of Purchaser set forth in this Agreement shall be true and correct 
in all material respects as of the date of this Agreement and as of the 
applicable Closing Date as though made on and as of the applicable Closing 
Date, and the Company shall have received a certificate to the foregoing 
effect signed on behalf of Purchaser by its general partner.

       (b)     PERFORMANCE OF OBLIGATIONS OF PURCHASER.  Purchaser shall have 
performed in all material respects the obligations required to be performed 
by it under this Agreement prior to the applicable Closing Date, and the 
Company shall have received a certificate to such effect signed on behalf of 
Purchaser by its general partner.

       (c)     CLOSING DELIVERIES.  All documents, instruments, certificates or
other items required to be delivered by Purchaser pursuant to SECTION 7.2(a), in
the case of the Initial Closing, or SECTION 7.3(a), in the case of the Option
Closing, shall have been delivered.


                                      -28-
<PAGE>

       (d)     HSR FILINGS.  The Purchaser shall have filed all reports required
to be filed by the Purchaser under the HSR Act concerning the transactions
contemplated hereby.

                                 ARTICLE VII.
                                 THE CLOSINGS

       Section 7.1    THE CLOSINGS.  

       (a)     Subject to the satisfaction or waiver of the conditions set 
forth in Article VI, the purchase and sale of the Initial Shares to be 
purchased by Purchaser hereunder (the "INITIAL CLOSING") will take place at 
the offices of Vinson & Elkins L.L.P., 1001 Fannin, Houston, Texas, 77002, at 
10:00 a.m., local time, on the later of the May 7, 1999 or the third Business 
Day following the satisfaction or waiver (subject to applicable Law) of each 
of the conditions to the obligations of the parties to effect the 
transactions to occur at the Initial Closing as set forth in Article VI, or 
on such other date as mutually agreed to by the parties hereto.  The date on 
which the Initial Closing occurs is herein referred to as the "INITIAL 
CLOSING DATE." All closing transactions at the Initial Closing shall be 
deemed to have occurred simultaneously.

       (b)     Subject to the satisfaction or waiver of the conditions set 
forth in Article VI, the purchase and sale of the Option Shares to be 
purchased by Purchaser hereunder (the "OPTION CLOSING") will take place at 
the offices of Vinson & Elkins L.L.P., 1001 Fannin, Houston, Texas, 77002, at 
10:00 a.m., local time, on the Business Day specified in the Exercise Notice, 
or on such other date as mutually agreed to by the parties hereto.  The date 
on which the Option Closing occurs is herein referred to as the "OPTION 
CLOSING DATE". All closing transactions at the Option Closing shall be deemed 
to have occurred simultaneously.   The Initial Closing and the Option Closing 
are sometimes referred to herein as the "CLOSINGS" or individually as a 
"CLOSING" and the Initial Closing Date and the Option Closing Date are 
sometimes referred to herein as the "CLOSING DATES" or individually as a 
"CLOSING DATE".  

       Section 7.2    ACTIONS TO OCCUR AT THE INITIAL CLOSING.

       (a)     At the Initial Closing, Purchaser shall deliver to the Company 
the following:

               (i)    PURCHASE PRICE.  An amount equal to the Initial Purchase
       Price for the Initial Shares in accordance with Article II.

               (ii)   CERTIFICATES.  The certificates described in SECTIONS
       6.3(a) and 6.3(b).

               (iii)  REGISTRATION RIGHTS AGREEMENT.  The Registration Rights
       Agreement, duly executed by Purchaser.

       (b)     At the Initial Closing, the Company shall deliver to Purchaser 
the following:

               (i)    SHARE CERTIFICATES.  Certificates representing the
       Initial Shares.


                                      -29-
<PAGE>

               (ii)   REGISTRATION RIGHTS AGREEMENT. The Registration Rights
       Agreement, duly executed.

               (iii)  CERTIFICATES.  The certificates described in SECTIONS
       6.2(a) and 6.2(b).

               (iv)   CONSENTS UNDER AGREEMENTS.  The original of each consent
       or approval, if any, pursuant to SECTION 6.2(d).

               (v)    LEGAL OPINIONS.  The opinion of counsel referred to in
       SECTION 6.2(e).


       Section 7.3    ACTIONS TO OCCUR AT THE OPTION CLOSING.

       (a)     At the Option Closing, Purchaser shall deliver to the Company 
the following:

               (i)    PURCHASE PRICE.  An amount equal to the Option Purchase
       Price for the Option Shares being purchased in accordance with
       Article II.

               (ii)   CERTIFICATES.  The certificates described in SECTIONS
       6.3(a) and 6.3(b).

       (b)     At the Option Closing, the Company shall deliver to Purchaser 
the following:

               (i)    SHARE CERTIFICATES.  Certificates representing the Option
       Shares being purchased.

               (ii)   CERTIFICATES.  The certificates described in SECTIONS
       6.2(a) and 6.2(b).

               (iii)  LEGAL OPINIONS.  The opinion of counsel referred to in
       SECTION 6.2(e).

                                ARTICLE VIII.
                                 TERMINATION
                                          
       Section 8.1    TERMINATION.  This Agreement may be terminated prior to 
the Initial Closing:

       (a)     by mutual consent of Purchaser and the Company;

       (b)     by either Purchaser or the Company:

               (i)    in the event of a breach by the other party of any
       representation, warranty, covenant or agreement contained in this
       Agreement which (A) would give rise to the failure of a condition set
       forth in SECTION 6.2 or 6.3, and (B) cannot be cured or, if curable, has
       not been cured within 20 days following receipt by the breaching party
       of written notice of such breach;

               (ii)   if a court of competent jurisdiction or other
       Governmental Entity shall have issued an order, decree, or ruling 
       or taken any other action (which order, decree, or ruling

                                      -30-
<PAGE>

       Purchaser and the Company shall use all commercially reasonable efforts 
       to lift), in each case permanently restraining, enjoining, or otherwise 
       prohibiting the transactions contemplated by this Agreement, and such 
       order, decree, ruling, or other action shall have become final and 
       nonappealable; rovided, however, that the right to terminate this 
       Agreement under this clause (ii) shall not be available to any party 
       whose breach of this Agreement has been the cause of, or resulted in, 
       such order, decree, ruling or other action; or

               (iii)  if the Initial Closing shall not have occurred by May 14,
       1999, provided, however, that the right to terminate this Agreement
       under this clause (iii) shall not be available to any party whose breach
       of this Agreement has been the cause of, or resulted in, the failure of
       the Initial Closing to occur on or before such date.

       The right of any party hereto to terminate this Agreement pursuant to 
this SECTION 8.1 shall remain operative and in full force and effect 
regardless of any investigation made by or on behalf of any party hereto, any 
person controlling any such party or any of their respective officers, 
directors, employees, accountants, consultants, legal counsel, agents, or 
other representatives whether prior to or after the execution of this 
Agreement.

       Section 8.2    EFFECT OF TERMINATION.  In the event of the termination 
of this Agreement, written notice thereof shall forthwith be given to the 
other party specifying the provision hereof pursuant to which such 
termination is made, and this Agreement shall forthwith become null and void, 
except for liability of a party arising out of a willful breach of, or 
misrepresentation under, this Agreement prior to such termination (but in no 
event shall any party hereto be entitled to recover punitive, consequential, 
special or exemplary damages).

                                 ARTICLE IX.
                              RECOVERY OF FEES

       Any party who shall obtain a final judgment in a court of competent 
jurisdiction for the payment of damages by another party for a breach of this 
Agreement or any other Transaction Document shall be entitled to recover 
reasonable attorneys' fees and court costs incurred in connection with the 
obtaining of such judgment.

                                  ARTICLE X.
                                MISCELLANEOUS

       Section 10.1   SURVIVAL OF PROVISIONS.

       (a)     The representations and warranties of the Company and 
Purchaser made herein or in any other Transaction Document and the covenants 
of the Company and Purchaser to be complied with on or prior to the Closings 
shall remain operative and in full force and effect pursuant to their terms, 
regardless of (x) any investigation made by or on behalf of Purchaser or the 
Company, as the case may be, or (y) acceptance of any of the Shares and 
payment by Purchaser therefor, until the date which is 18 months following 
the Initial Closing; provided that the representations and warranties 
contained in SECTIONS 3.1, 3.3, 3.4, 3.12 AND 3.18 shall survive until the 
sixth anniversary of the Initial Closing; and provided, further, that such 
representations and warranties shall survive as to any claim 


                                      -31-
<PAGE>

or demand made prior to their termination date until such claim or demand is 
fully paid or otherwise resolved by the parties hereto in writing or 
otherwise.

       (b)     The covenants and agreements of the Company and Purchaser 
contained in this Agreement that, by their terms, are to be performed or 
complied with after either Closing Date will survive until the period 
specified herein with respect to such covenant or agreement; and PROVIDED, 
FURTHER, that such covenants and agreements shall survive as to any claim or 
demand made prior to their termination date until such claim or demand is 
fully paid or otherwise resolved by the parties hereto in writing or 
otherwise.

       Section 10.2   NO WAIVER; MODIFICATION IN WRITING.  No failure or 
delay on the part of the Company or Purchaser in exercising any right, power 
or remedy hereunder shall operate as a waiver thereof, nor shall any single 
or partial exercise of any such right, power or remedy preclude any other or 
further exercise thereof or the exercise of any other right, power or remedy. 
 The provisions of this Agreement, including the provisions of this sentence, 
may not be amended, modified or supplemented, and waivers or consents to 
departures from the provisions hereof may not be given without the written 
consent of the Company and Purchaser.  Any amendment, supplement or 
modification of or to any provision of this Agreement, or any waiver of any 
provision of this Agreement, shall be effective only in the specific instance 
and for the specific purpose for which made or given.  Except where notice is 
specifically required by this Agreement, no notice to or demand on any party 
hereto in any case shall entitle the other party to any other or further 
notice or demand in similar or other circumstances.

       Section 10.3   SPECIFIC PERFORMANCE.  The parties recognize that in 
the event the Company or Purchaser should refuse to perform under the 
provisions of this Agreement or any other Transaction Document, monetary 
damages alone will not be adequate.  Purchaser or the Company, as the case 
may be, shall therefore be entitled, in addition to any other remedies which 
may be available, including money damages, to obtain specific performance of 
the terms of this Agreement. In the event of any action to enforce this 
Agreement or any other Transaction Document specifically, the Company and 
Purchaser hereby waive the defense that there is an adequate remedy at law.

       Section 10.4   SEVERABILITY.  If any term or other provision of this 
Agreement is invalid, illegal, or incapable of being enforced by any rule of 
applicable law, or public policy, all other conditions and provisions of this 
Agreement shall nevertheless remain in full force and effect so long as the 
economic or legal substance of the transactions contemplated herein are not 
affected in any manner materially adverse to any party.  Upon such 
determination that any term or other provision is invalid, illegal, or 
incapable of being enforced, the parties hereto shall negotiate in good faith 
to modify this Agreement so as to effect the original intent of the parties 
as closely as possible in a mutually acceptable manner in order that the 
transactions contemplated herein are consummated as originally contemplated 
to the fullest extent possible.

       Section 10.5   FEES AND EXPENSES.  Within 30 days after the Initial 
Closing, the Company shall pay to Purchaser an amount equal to Purchaser's 
Expenses through the Initial Closing Date (the amount of such costs and 
expenses shall have been furnished to the Company at least within 25 days 
after the Initial Closing Date), and within 30 days after the Option Closing, 
the Company shall pay to Purchaser an amount equal to Purchaser's Expenses 
through the Option Closing Date that have 


                                      -32-
<PAGE>

not been reimbursed pursuant to the preceding sentence (the amount of such 
costs and expenses shall have been furnished to the Company at least within 
25 days after the Option Closing Date);  PROVIDED, HOWEVER, that all such 
Purchaser's Expenses to be paid by the Company pursuant to the foregoing 
(other than fees payable in connection with filings under the HSR Act 
pursuant to SECTION 5.4) shall not in the aggregate exceed $150,000.  

       Section 10.6   PARTIES IN INTEREST.  This Agreement shall be binding 
upon and, except as provided below, inure solely to the benefit of each party 
hereto and their successors and assigns, and nothing in this Agreement, 
express or implied, is intended to confer upon any other Person any rights or 
remedies of any nature whatsoever under or by reason of this Agreement.

       Section 10.7   NOTICES.  All notices and other communications 
hereunder shall be in writing and shall be deemed given if delivered 
personally or by facsimile or mailed by registered or certified mail (return 
receipt requested) or Federal Express or another recognized overnight courier 
to the parties at the following addresses (or at such other address for a 
party as shall be specified by like notice):

               (a)    If to Purchaser, to:

                      SCF-IV, L.P.
                      600 Travis, Suite 6600
                      Houston, Texas 77002
                      Attention:  David C. Baldwin
                      Facsimile:  (713) 227-7850
                      
               (b)    If to the Company, to:

                      Input/Output, Inc.
                      11104 West Airport Boulevard
                      Stafford, Texas 77477
                      Attention:  Chairman
                      Facsimile:  (281) 879-3652

       Any of the above addresses may be changed at any time by notice given 
as provided above; provided, however, that any such notice of change of 
address shall be effective only upon receipt.  All notices, requests or 
instructions given in accordance herewith shall be deemed received on the 
date of delivery, if hand delivered, on the date of receipt, if telecopied, 
three Business Days after the date of mailing, if mailed by registered or 
certified mail, return receipt requested, and one Business Day after the date 
of sending, if sent by Federal Express or other recognized overnight courier.

       Section 10.8   COUNTERPARTS.  This Agreement may be executed and 
delivered (including by facsimile transmission) in one or more counterparts, 
all of which shall be considered one and the same agreement and shall become 
effective when one or more counterparts have been signed by each of the 
parties and delivered to the other parties, it being understood that all 
parties need not sign the same counterpart.


                                      -33-
<PAGE>

       Section 10.9   ENTIRE AGREEMENT; TERMINATION OF CONFIDENTIALITY 
AGREEMENT.  This Agreement (which term shall be deemed to include the 
Exhibits and Schedules hereto and the other certificates, documents and 
instruments delivered hereunder) and the other Transaction Documents 
constitute the entire agreement of the parties hereto with respect to the 
subject matter hereof and thereof and supersede all prior agreements, letters 
of intent and understandings, both written and oral, among the parties with 
respect to the subject matter hereof and thereof.  There are no 
representations or warranties, agreements, or covenants of the parties with 
respect to the subject matter hereof and thereof other than those expressly 
set forth in this Agreement and the other Transaction Documents.  The parties 
hereby agree that the terms of this Agreement supersede and terminate the 
provisions of the Confidentiality and Standstill Agreement dated as of 
February 24, 1999 between the Company and SCF Partners, provided that if this 
Agreement is terminated prior to the Initial Closing, such agreement shall be 
reinstated pursuant to its terms.

       Section 10.10  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY AND 
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS, WITHOUT GIVING 
EFFECT TO ANY CONFLICTS OF LAW PROVISIONS.

       Section 10.11  PUBLIC ANNOUNCEMENTS.  The Company and Purchaser shall 
consult with each other before issuing any press release or otherwise making 
any public statements with respect to this Agreement or the transactions 
contemplated hereby, except for statements required by Law or by any listing 
agreements with or rules of any national securities exchange or made in 
disclosures reasonably determined as required to be filed pursuant to the 
Securities Act or the Exchange Act.

       Section 10.12  ASSIGNMENT.  Neither this Agreement nor any of the 
rights, interests, or obligations hereunder shall be assigned by any of the 
parties hereto, whether by operation of Law or otherwise.

       Section 10.13  HEADINGS.  The headings of this Agreement are for 
convenience of reference only and are not part of the substance of this 
Agreement.

              [The remainder of this page is intentionally left blank.]


                                      -34-
<PAGE>

       IN WITNESS WHEREOF, each of the parties hereto has caused this 
Agreement to be executed by its duly authorized officer as of the date first 
written above.

                              INPUT/OUTPUT, INC. 


                              By: /s/ W. J. Zeringue                        
                                  -----------------------------------------
                              Name:   W. J. Zeringue
                              Title:  Chief Executive Officer
                                   



                              SCF-IV, L.P.


                              By: SCF-IV, G.P., Limited Partnership,
                              its General Partner

                              By: L. E. Simmons & Associates, Incorporated,
                              its General Partner

                              By: /s/ David C. Baldwin                     
                                  -----------------------------------------
                              Name: David C. Baldwin
                              Title: Managing Director




                                      -1-


<PAGE>

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------










                            REGISTRATION RIGHTS AGREEMENT

                                    by and between

                                  INPUT/OUTPUT, INC.

                                         and

                                     SCF-IV, L.P.




                               Dated as of May 7, 1999











- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

<PAGE>

                         REGISTRATION RIGHTS AGREEMENT

       This REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT") is made and 
entered into this 7th day of May 1999, by and between Input/Output Inc., a 
Delaware corporation (the "COMPANY") and SCF-IV, L.P., a Delaware limited 
partnership (the "PURCHASER").

                                   RECITALS:

       This Agreement is made pursuant to the Purchase Agreement, dated April 
21, 1999 between the Company and the Purchaser (the "PURCHASE AGREEMENT").  
In order to induce the Purchaser to enter into the Purchase Agreement, the 
Company has agreed to provide the registration rights set forth in this 
Agreement.  The execution of this Agreement is a condition to the closing 
under the Purchase Agreement.

                                   AGREEMENT:

       The parties hereby agree as follows:

1.     DEFINITIONS.

       (a)     As used in this Agreement, the following terms will have the 
following meanings:

       "DEMAND REGISTRATION" has the meaning set forth in Section 3(a).

       "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended 
from time to time.

       "INITIAL REGISTRATION DATE" has the meaning set forth in Section 3(a). 

       "MAJORITY" means 51% or more.

       "PERSON" means any individual, partnership, corporation, limited 
liability company, trust or unincorporated organization or association, or a 
government or agency or political subdivision thereof.

       "PIGGYBACK REGISTRATION" has the meaning set forth in Section 4(a).

       "REGISTRATION EXPENSES" has the meaning set forth in Section 8(a).

       "REGISTRABLE SECURITIES" means the Underlying Shares and any other 
securities issued or issuable with respect to the Underlying Shares by way of 
stock dividend or stock split or in connection with a combination of shares, 
reclassification, recapitalization, merger, consolidation or other 
reorganization; PROVIDED, HOWEVER, that a Registrable Security shall cease to 
be a Registrable Security to the extent provided in Section 2(a). 

<PAGE>

       "RULE 144"  means Rule 144 under the Securities Act (or any similar 
provisions then in force).

       "SEC" means the Securities and Exchange Commission.

       "SECURITIES ACT" means the Securities Act of 1933, as amended from 
time to time.

       "SERIES B PREFERRED STOCK" means shares of the Company's Series B 
Preferred Stock, par value $.01 per share.

       "SERIES C PREFERRED STOCK" means shares of the Company's Series C 
Preferred Stock, par value $.01 per share.

       "SHARES" means all shares of Series B Preferred Stock or Series C 
Preferred Stock that are issued and sold pursuant to the Purchase Agreement.

       "SHELF REGISTRATION" has the meaning  set forth in Section 5.

       "UNDERLYING SHARES" means all Underlying Shares (as defined in the 
Purchase Agreement) issuable upon conversion of the Shares.

       "UNDERWRITTEN REGISTRATION" or "UNDERWRITTEN OFFERING" means any 
registration in which securities of the Company are sold pursuant to a firm 
commitment underwriting.

       (b)     All undefined capitalized terms used herein shall have the 
meaning set forth in the Purchase Agreement.

2.     SECURITIES SUBJECT TO THIS AGREEMENT.

       (a)     REGISTRABLE SECURITIES.  The securities entitled to the 
benefits of this Agreement are the Registrable Securities but, with respect 
to any particular Registrable Security, only so long as such security 
continues to be a Registrable Security.  A Registrable Security shall cease 
to be a Registrable Security when (i) it has been disposed of in a 
transaction effectively registered under the Securities Act, (ii) has been 
sold pursuant to Rule 144, (iii) it is held by a Person not entitled to the 
benefits of registration rights under this Agreement by virtue of Section 
12(f) hereof, (iv) if the holder thereof is an "affiliate" of the Company 
within the meaning of Rule 144, at such time as the Registrable Securities 
held by such holder constitute less than 1% of the then outstanding shares of 
Common Stock of the Company and such Registrable Securities could be sold 
without registration pursuant to Rule 144, (v) if the holder thereof is not 
an "affiliate" of the Company within the meaning of Rule 144, at such time as 
the Registrable Securities held by such holder constitute less than 4% of the 
then outstanding shares of Common Stock of the Company and such Registrable 
Securities could be sold freely pursuant to paragraph (k) of Rule 144, or 
(vi) it has otherwise been transferred and a new certificate or other 
evidence of ownership for it not bearing the legend set forth in Section 
5.8(a) of the Purchase Agreement (or other legend of similar import) has been 
delivered (not subject to any stop transfer order) by or on behalf of the 
Company and no other restriction on transfer exists.


                                      -2-
<PAGE>

       (b)     HOLDERS OF REGISTRABLE SECURITIES.  A Person is deemed to be a 
holder of Registrable Securities whenever such Person owns Registrable 
Securities or has the right to acquire such Registrable Securities (whether 
upon conversion, exercise or exchange of other securities or otherwise), 
disregarding any legal restrictions upon the exercise of such right, whether 
or not such acquisition has actually been effected.

3.     DEMAND REGISTRATION.

       (a)     REQUESTS FOR REGISTRATION.  Subject to the provisions of 
Section 3(b), at any time on or after the earlier of (i) the Initial 
Conversion Date as defined in the Certificate of Designation for the Series B 
Preferred Stock, or (ii) the date 60 days prior to the third anniversary of 
the date of the original issuance of the Series B Preferred Stock pursuant to 
the Purchase Agreement (such earlier date being referred to herein as the 
"INITIAL REGISTRATION DATE"), any holder or holders of at least 25% of the 
then outstanding Registrable Securities may request at any time a 
registration by the Company under the Securities Act of all or part of their 
Registrable Securities (a "DEMAND REGISTRATION"); PROVIDED, HOWEVER that the 
number of Registrable Securities to be included in such Demand Registration 
must be at least 1,000,000 (such number of shares to be appropriately 
adjusted in the event of any stock dividend or stock split or in connection 
with a combination of shares, recapitalization, reclassification, merger, 
consolidation or other reorganization) or such lesser number of Registrable 
Securities as have an aggregate Market Price (as defined in the Certificate 
of Designation for the Series B Preferred Stock) of at least $10,000,000 as 
of the date of such request.  Within ten days after receipt of such request, 
the Company will serve written notice by overnight courier of such 
registration request to all holders of Registrable Securities and will, 
subject to the provisions of Section 3(b), include in such registration all 
Registrable Securities with respect to which the Company has received written 
requests for inclusion therein within 15 business days after distribution to 
the applicable holder of the Company's notice.  All requests made pursuant to 
this Section 3(a) will specify the amount of Registrable Securities to be 
registered and will also specify the intended method of disposition thereof; 
PROVIDED, HOWEVER, that such method of disposition will be limited to an 
underwritten offering if requested by the holders of a Majority of the 
Registrable Securities requested to be included in such registration.

       (b)     NUMBER OF REGISTRATIONS.  The holders of Registrable 
Securities will be entitled to request an aggregate of  two Demand 
Registrations.  A registration initiated as a Demand Registration will not 
constitute a Demand Registration for the purposes of the foregoing (i) unless 
such registration has been declared effective by the SEC and remains 
effective for the period set forth in Section 7(a)(iii); PROVIDED, HOWEVER, 
that, if more than 15% of the Registrable Securities requested to be included 
in a Demand Registration which is an underwritten registration can be 
excluded therefrom by reason of the provisions of Section 3(e), the holders 
of Registrable Securities will be entitled to one additional Demand 
Registration or (ii) if after such registration has been declared effective 
by the SEC it is subject to any stop order, injunction or other adverse order 
or action of the SEC or other governmental authority.

       (c)     INTENTIONALLY OMITTED.

       (d)     NO RIGHTS OF COMPANY OR OTHER SECURITYHOLDERS TO PIGGYBACK ON 
DEMAND REGISTRATIONS.  Neither the Company nor any of its securityholders 
(other than the holders of 


                                      -3-
<PAGE>

Registrable Securities in such capacity) has any right to include any of the 
Company's securities in a registration statement initiated as a Demand 
Registration under this Section 3, unless (i) such securities are of the same 
class as the Registrable Securities being registered, (ii) the holders of a 
Majority of the Registrable Securities being registered in such registration 
consent to such inclusion in writing, subject to Section 3(e), (iii) if such 
Demand Registration is an underwritten offering, the managing underwriters 
agree that some or all of such securities can be included without adversely 
affecting such offering or offering price and (iv) the Company or the selling 
securityholders, as applicable, agree to sell their securities on the same 
terms and conditions as apply to Registrable Securities and the holders of 
such Registrable Securities.  If any securityholders of the Company (other 
than the holders of Registrable Securities in such capacity) register 
securities of the Company pursuant to a Demand Registration hereunder in 
accordance with the provisions of this Section 3(d), such securityholders 
will pay the fees and expenses of counsel to such securityholders and their 
PRO RATA share of the Registration Expenses if such PRO RATA share of the 
Registration Expenses for such registration are not paid by the Company for 
any reason.

       (e)     PRIORITY ON DEMAND REGISTRATIONS.  If a Demand Registration is 
an underwritten offering and the managing underwriters advise the Company and 
the selling holders of the Registrable Securities in writing that in their 
opinion the number of Registrable Securities requested to be included exceeds 
the number of securities which can be sold in such offering without adversely 
affecting the proposed offering or the offering price, the Company will 
include in such registration the number of Registrable Securities which in 
the opinion of such underwriters can be sold without adversely affecting the 
proposed offering or the offering price, and such securities will be 
allocated PRO RATA among the holders of Registrable Securities on the basis 
of the number of the Registrable Securities requested to be included in such 
registration by their respective holders.  If securities (other than 
Registrable Securities) are proposed to be included by the Company or its 
other securityholders in a Demand Registration which is an underwritten 
offering (subject to and in accordance with the provisions of Section 3(d)) 
and the managing underwriters advise the Company and the selling holders of 
Registrable Securities in writing that fewer than all of said other 
securities can be sold, in addition to all of the Registrable Securities 
being registered, without adversely affecting the proposed offering or the 
offering price in such underwritten offering, those other securities which 
are permitted to be included will be allocated among the Company and the 
other securityholders in such proportions as such securityholders and the 
Company may agree.

       (f)      SELECTION OF UNDERWRITERS.  If any Demand Registration is an 
underwritten offering, or a best efforts underwritten offering, the 
investment banker or investment bankers and manager or managers that will 
administer the offering will be selected by the Company; PROVIDED, HOWEVER, 
such investment bankers and managers must be reasonably satisfactory to the 
holders of a Majority of the Registrable Securities requested to be included 
in such offering.

       (g)     OTHER REGISTRATION RIGHTS AGREEMENTS.  Without the prior 
written consent of the holders of a Majority of the Registrable Securities, 
the Company will not enter into any new registration rights agreements that 
affect in any material respect the rights of the holders of the 


                                      -4-
<PAGE>

Registrable Securities. 

4.     PIGGYBACK REGISTRATIONS.

       (a)     RIGHT TO PIGGYBACK.  On or after the Initial Registration 
Date, whenever the Company proposes to register any securities under the 
Securities Act (excluding registrations on Form S-4 or S-8 or equivalent 
forms), other than pursuant to a Demand Registration under Section 3 (a 
"PIGGYBACK REGISTRATION"), the Company will give written notice to all 
holders of Registrable Securities of its intention to effect such a 
registration not later than the earlier to occur of (i) the tenth day 
following receipt by the Company of notice of exercise of other demand 
registration rights or (ii) 30 days prior to the anticipated filing date.  
Subject to the provisions of Sections 4(c) and (d), the Company will include 
in such Piggyback Registration all Registrable Securities with respect to 
which the Company has received written requests for inclusion therein within 
ten business days after the receipt by the applicable holder of Registrable 
Securities of the Company's notice.  The holders of Registrable Securities 
will be permitted to withdraw all or any part of such holder's Registrable 
Securities from a Piggyback Registration at any time prior to the date such 
Piggyback Registration becomes effective with the SEC, PROVIDED THAT, in the 
case of an underwritten offering, such withdrawal is consistent with 
customary and reasonable restrictions agreed upon by the managing 
underwriter.  If a Piggyback Registration is an underwritten offering 
effected under (i) Section 4(c), all Persons whose securities are included in 
the Piggyback Registration will be obligated to sell their securities on the 
same terms and conditions as apply to the securities being issued and sold by 
the Company or (ii) Section 4(d), all Persons whose securities are included 
in the Piggyback Registration will be obligated to sell their securities on 
the same terms and conditions as apply to the securities being sold by the 
Person or Persons who initiated the Piggyback Registration under Section 
4(d). Notwithstanding the foregoing, if, at any time after giving written 
notice of a Piggyback Registration but prior to the effective date of the 
registration statement filed in connection therewith, the Company shall 
determine for any reason not to register such securities, the Company may, at 
its election give written notice of such determination to the holders of 
Registrable Securities and thereupon shall be relieved of its obligation to 
register any Registrable Securities in such registration.

       (b)     PIGGYBACK EXPENSES.  The Registration Expenses of the holders 
of Registrable Securities included in a Piggyback Registration will be paid 
by the Company.

       (c)     PRIORITY ON PRIMARY REGISTRATIONS.  If a Piggyback 
Registration is an underwritten registration on behalf of the Company, and 
the managing underwriters advise the Company in writing that in their opinion 
the total number or dollar amount of securities requested to be included in 
such registration exceeds the number or dollar amount of securities which can 
be sold in such offering without adversely affecting the offering or the 
offering price, the Company will include in such registration: (i) first, all 
securities the Company proposes to sell, (ii) second, up to the full number 
or dollar amount of Registrable Securities requested to be included in such 
registration in excess of the number or dollar amount of securities the 
Company proposes to sell which, in the opinion of such underwriters, can be 
sold without adversely affecting the offering or the offering price 
(allocated PRO RATA among the holders of such Registrable Securities on the 
basis of the dollar amount or number of Securities requested to be included 
therein by each such holder) and (iii) third, such other securities (provided 
such securities are of the same class as the securities being sold by the 
Company) as are requested to be included in such registration equal to the 
balance, if any, allocated among the holders 

                                      -5-
<PAGE>

of such securities in such proportions as the Company and such holders may 
agree.

       (d)     PRIORITY ON SECONDARY REGISTRATIONS.  If a Piggyback 
Registration is an underwritten secondary registration on behalf of holders 
of the Company's securities (other holders of Registrable Securities in their 
capacity as such), and the managing underwriters advise the Company in 
writing that in their opinion the dollar amount or number of securities 
requested to be included in such registration exceeds the dollar amount or 
number of securities which can be sold in such offering without adversely 
affecting the offering or the offering price, the Company will include in 
such registration (i) first, the number or dollar amount of securities which 
in the opinion of such underwriters can be sold without adversely affecting 
the offering or the offering price of the securities intended to be included 
therein on behalf of the other holders of the Company's securities, allocated 
among the holders of such securities in such proportions as the Company and 
such holders may agree, and (ii) to the extent of the balance, if any, the 
Registrable Securities requested to be included in such registration, 
allocated PRO RATA among the holders of such Registrable Securities on the 
basis of the dollar amount or number of securities requested to be included 
therein by each such holder.

       (e)     UNDERWRITTEN OFFERING OF DIFFERENT CLASSES OF SECURITIES. 
Notwithstanding anything to the contrary in this Section 4, if a Piggyback 
Registration is an underwritten offering of a class of securities of the 
Company different from the Registrable Securities proposed to be included in 
such offering and the managing underwriters advise that in their opinion 
Registrable Securities of a different class cannot be included in such 
offering without adversely affecting the offering or the offering price, then 
the holders of the Registrable Securities shall not be entitled to include 
Registrable Securities in such registration.

       (f)     SELECTION OF UNDERWRITERS.  If any Piggyback Registration is 
an underwritten offering, as between the Company and the holders of 
Registrable Securities, the Company will have the right to select the 
investment banker or investment bankers and manager or managers to administer 
the offering.

5.     SHELF REGISTRATION. 

       On or prior to the 60th day prior to the fifth anniversary of the date 
of original issuance of the Series B Preferred Stock pursuant to the Purchase 
Agreement, the Company shall file a registration statement on Form S-3 (or 
any similar short form registration), if the Company and the transaction then 
qualify for the use of such short form registration, to register for resale 
from time to time pursuant to Rule 415 under the Securities Act (or any 
similar or successor rule) (the "SHELF REGISTRATION") all then outstanding 
Registrable Securities (unless any holder thereof instructs the Company 
otherwise with respect to his Registrable Securities) and shall use its 
reasonable best efforts to cause such Shelf Registration to become effective 
as soon as practicable after such filing and to maintain the effectiveness of 
such Shelf Registration until the first anniversary of the Mandatory 
Conversion Date as defined in the Certificate of Designation for the Series B 
Preferred Stock or such earlier date when all the Registrable Securities 
covered by such registration statement are sold or cease to be Registrable 
Securities.  All Registration Expenses in connection with the Shelf 
Registration shall be borne by the Company.  The Company and other holders of 
securities of the Company may not register securities under a registration 
statement filed pursuant to this Section 5, without the consent of at least a 
Majority of the Registrable Securities included in such Shelf 

                                      -6-
<PAGE>

Registration. 

6.     DEFERRAL OF FILING; SUSPENSION OF SHELF REGISTRATION STATEMENT.

       Notwithstanding anything to the contrary in this Agreement:

       (a)     The Company may defer the filing (but not the preparation) of 
a registration statement required by Section 3 or Section 5 until a date not 
later than 60 days (less the number of days during the previous twelve months 
that the use of a prospectus was suspended pursuant to this Section 6 or 
Section 12(a)) after the date of receipt by the Company of a request for a 
Demand Registration (or after the required filing date in the case of a 
registration required to be filed pursuant to Section 5) if at the time the 
Company receives such request it is engaged in confidential negotiations or 
other confidential business activities, disclosure of which would be required 
in such registration statement (but would not be required if such 
registration statement were not filed) and the Company determines in good 
faith that such disclosure would be materially detrimental to the Company and 
its shareholders. Any registration statement the filing of which is deferred 
pursuant to the foregoing shall be filed forthwith if the negotiations or 
other activities are disclosed or terminated. In order to defer the filing of 
a registration statement pursuant to this Section 6, the Company shall 
promptly, upon determining to seek such deferral, deliver to each requesting 
holder (or, in the case of a registration pursuant to Section 5, each holder) 
a certificate signed by the President or Chief Financial Officer of the 
Company stating that the Company is deferring such filing in accordance with 
this Section 6(a).  Within 20 days after receiving such certificate, the 
requesting holder may withdraw such request by giving notice to the Company, 
and, if withdrawn, the request for a Demand Registration shall be deemed not 
to have been made for all purposes of this Agreement, PROVIDED THAT the 
Company may defer the filing of a registration statement pursuant to the 
foregoing not more than once during any twelve month period; and

       (b)     If the Company has effected the Shelf Registration pursuant to 
Section 5, the Company may, at any time following the 30th day after the 
effectiveness thereof and subject to the last sentence of this Section 6, 
give notice to the holders of Registrable Securities directing that all sales 
under such shelf registration statement must be deferred and not made for up 
to 30 days (less the number of days during the previous twelve months that 
the use of a prospectus was suspended pursuant to this Section 6 or Section 
12(a)) if at the time the Company gives such notice, the Company is engaged 
in confidential negotiations or other confidential business activities, 
disclosure of which would be required to be made in the prospectus included 
in such shelf registration statement (but would not be required if such sale 
were not made) in order to prevent such prospectus from containing any untrue 
statement of a material fact or omitting to state any material fact necessary 
to make the statements therein not misleading and the Company determines in 
good faith that such disclosure would be materially detrimental to the 
Company.  Any such notice given pursuant to this Section 6(b) shall be 
accompanied by a certificate signed by the President or Chief Financial 
Officer of the Company stating that the Company is deferring such filing in 
accordance with this Section 6(b).  A suspension of the Shelf Registration 
pursuant to this Section 6(b) shall be lifted immediately if the negotiations 
or other activities are disclosed or terminated.  The Company may suspend the 
use of the Shelf Registration pursuant to this Section 6(b) not more than 
once during any twelve month period.


                                      -7-
<PAGE>

7.     REGISTRATION PROCEDURES.

       (a)     Whenever the Company is obligated to register any Registrable
Securities in accordance with the terms and conditions of this Agreement, the
Company will use its best efforts to effect the registration and to permit the
sale of such Registrable Securities in accordance with the intended method of
disposition thereof, and pursuant thereto the Company will as expeditiously as
possible:

               (i)    prepare and file with the SEC, not later than 60 days
       after receipt of a request to file a registration statement with respect
       to such Registrable Securities (or on or prior to the required filing
       date specified in Section 5 with respect to the Shelf Registration), a
       registration statement with respect to such Registrable Securities, and
       use its best efforts to cause such registration statement to become
       effective; PROVIDED, HOWEVER, that before filing a registration
       statement or prospectus or any amendments or supplements thereto, the
       Company will furnish to the counsel selected by the holders of a
       Majority of the Registrable Securities being registered in such
       registration statement copies of all such documents proposed to be
       filed, which documents will be subject to the review of such counsel;
       each such registration statement will be on a form for which the Company
       then qualifies, which is available for the sale of the Registrable
       Securities in accordance with the intended method of disposition thereof
       and which is reasonably satisfactory to the holders of a Majority of the
       Registrable Securities being registered (or the managing underwriters in
       the case of a firm or best efforts underwriting offering);

               (ii)   notify each seller of Registrable Securities of any stop
       order issued by the SEC and take all reasonable actions required to
       prevent the entry of such stop order or to remove it at the earliest
       possible time if entered;

               (iii)  prepare and file with the SEC such amendments and
       supplements to such registration statement and the prospectus used in
       connection therewith as may be necessary to keep such registration
       statement effective for a period of not less than 90 days, or such
       shorter period as may be required if all Registrable Securities covered
       by such registration statement are sold prior to the expiration of such
       90-day period (except in connection with an underwritten offering, in
       which case such registration statement shall be kept effective as long
       as the underwriters reasonably request in the underwriting agreement and
       except in the case of the Shelf Registration, which shall be kept
       effective for the applicable period specified in Section 5), and comply
       with the provisions of the Securities Act with respect to the
       disposition of all securities covered by such registration statement
       during such period in accordance with the intended methods of
       disposition by the sellers thereof set forth in such registration
       statement;

               (iv)   furnish to each seller of Registrable Securities such
       number of copies of such registration statement, each amendment and
       supplement thereto (in each case including all exhibits thereto), the
       prospectus included in such registration statement (including each
       preliminary prospectus) and such other documents as such seller may
       reasonably request in order to facilitate the disposition of the
       Registrable Securities owned by such seller;


                                      -8-
<PAGE>

               (v)    use all commercially reasonable efforts to register or
       qualify such Registrable Securities under such other securities or blue
       sky laws of such jurisdictions as any seller reasonably requests and do
       any and all other acts and things which may be reasonably necessary or
       advisable to enable such seller to consummate the disposition in such
       jurisdictions of the Registrable Securities owned by such seller;
       PROVIDED, HOWEVER, that the Company will not be required to (i) qualify
       generally to do business in any jurisdiction where it would not
       otherwise be required to qualify but for this Section 7(a)(v), (ii)
       subject itself to taxation in any such jurisdiction or (iii) consent to
       general service of process in any such jurisdiction;

               (vi)   use all commercially reasonable efforts to cause the
       Registrable Securities covered by such registration statement to be
       registered with or approved by such other governmental agencies or
       authorities as may be necessary to enable the seller or sellers thereof
       to consummate the disposition of such Registrable Securities;

               (vii)  notify each seller of such Registrable Securities, at any
       time when a prospectus relating thereto is required to be delivered
       under the Securities Act, of the happening of any event as a result of
       which the prospectus included in such registration statement or any
       document incorporated therein by reference contains an untrue statement
       of a material fact or omits to state any material fact necessary to make
       the statements therein not misleading, and prepare and file promptly
       with the SEC a supplement or amendment to such prospectus or any such
       document incorporated therein by reference so that, as thereafter
       delivered to the purchasers of such Registrable Securities, such
       prospectus will not contain an untrue statement of a material fact or
       omit to state any material fact necessary to make the statements therein
       not misleading;

               (viii) cause all such Registrable Securities to be listed on
       each securities exchange on which similar securities issued by the
       Company are then listed;

               (ix)   provide a transfer agent and registrar for all
       Registrable Securities and a CUSIP number for all such Registrable
       Securities, in each case not later than the effective date of such
       registration statement;

               (x)    enter into such customary agreements (including an
       underwriting agreement in customary form with customary lock-up
       provisions not to exceed 180 days) and take all such other actions in
       connection therewith as the holders of a Majority of the Registrable
       Securities being registered or the managing underwriters, if any,
       reasonably request in order to expedite or facilitate the disposition of
       such Registrable Securities;

               (xi)   make available for inspection by any seller of
       Registrable Securities, any underwriter participating in any disposition
       pursuant to such registration statement, and any attorney, accountant or
       other agent retained by any such seller or underwriter, all financial
       and other records, pertinent corporate documents and properties of the
       Company, and cause the Company's officers, directors and employees to
       supply all information reasonably requested by any such seller,
       underwriter, attorney, accountant or agent in connection with such
       registration statement;


                                      -9-
<PAGE>

               (xii)  obtain a cold comfort letter from the Company's
       independent public accountants in customary form and covering such
       matters of the type customarily covered by cold comfort letters as the
       holders of a Majority of the Registrable Securities being registered or
       the managing underwriters reasonably request; and 

               (xiii) otherwise use its reasonable best efforts to comply with
       all applicable rules and regulations of the SEC, and make available to
       its security holders, as soon as reasonably practicable, an earnings
       statement covering the period of at least twelve months, but not more
       than eighteen months, beginning with the first month after the effective
       date of the Registration Statement, which earnings statement will
       satisfy the provisions of Section 11(a) of the Securities Act.

       (b)     The Company may require each seller of Registrable Securities as
to which any registration is being effected to furnish to the Company such
information regarding the distribution of such securities as the Company may
from time to time reasonably request.

8.     REGISTRATION EXPENSES.

       (a)     All expenses incident to the Company's performance of or 
compliance with this Agreement, including without limitation all registration 
and filing fees, fees and expenses of compliance with securities or blue sky 
laws (including reasonable fees and disbursements of counsel for the 
underwriters in connection with blue sky qualifications of the Registrable 
Securities), printing expenses, messenger, telephone and delivery expenses, 
and fees and disbursements of counsel for the Company and of all independent 
certified public accountants (including the expenses of any special audit or 
"cold comfort" letters required by or incident to such performance), fees and 
expenses of underwriters customarily paid by the issuer of securities 
(excluding discounts and commissions), the reasonable fees and expenses of 
any special experts retained by the Company or at the request of the managing 
underwriters in connection with such registration and fees and expenses of 
other Persons retained by the Company (all such expenses being herein called 
"REGISTRATION EXPENSES"), will be borne by the Company; provided; however, 
that all out of pocket Registration Expenses incurred by the Company pursuant 
to Section 3 shall be borne by the Sellers of Registrable Securities and 
other persons (including the Company) selling Common Stock pursuant to the 
applicable registration statement on a pro rata basis based on the number of 
shares of Common Stock to be sold pursuant to such registration statement.

       (b)     In connection with each registration hereunder, the holders of 
the Registrable Securities included therein shall be responsible for all fees 
and expenses of their counsel and for all underwriting discounts and 
commissions payable in respect of any sales of Registrable Securities. 

9.     INDEMNIFICATION; CONTRIBUTION.

       (a)     INDEMNIFICATION BY COMPANY.  In the event of any registration 
of Registrable Securities hereunder, the Company agrees to indemnify to the 
full extent permitted by law, each holder of Registrable Securities, its 
officers, directors and partners and each Person who controls such holder 
(within the meaning of the Securities Act and the Exchange Act) against all 
losses, claims, damages, liabilities and expenses (or actions in respect 
thereof) arising out of or based upon any untrue or alleged untrue statement 
of a material fact contained in any registration statement, prospectus or 
preliminary prospectus relating to the registration of such Registrable 
Securities or any omission or alleged omission to state therein a material 
fact required to be stated therein or necessary 


                                      -10-
<PAGE>

to make the statements therein not misleading, except insofar as the same are 
contained in any information furnished in writing to the Company by such 
holder expressly for use therein. The Company will reimburse each holder of 
Registrable Securities, its officers, directors, constituent partners and 
controlling Persons for any legal and other expenses as incurred in 
connection with investigating or defending any such losses, claims, damages, 
liabilities, expenses or actions. In connection with a firm commitment or 
best efforts underwritten offering, the Company will indemnify the 
underwriters or agents, their officers, directors, partners and each Person 
who controls such underwriters (within the meaning of the Securities Act and 
the Exchange Act) or agents to the same extent as provided above (or such 
greater extent as may be customarily required by the managing underwriters) 
with respect to the indemnification of the holders of Registrable Securities.

       (b)     INDEMNIFICATION BY HOLDER OF REGISTRABLE SECURITIES.  In 
connection with any registration statement in which a holder of Registrable 
Securities is participating, each such holder will furnish to the Company in 
writing such information and affidavits as the Company reasonably requests 
for use in connection with any such registration statement or prospectus and 
agrees to indemnify, to the extent permitted by law, the Company, its 
directors and officers and each Person who controls the Company (within the 
meaning of the Securities Act and the Exchange Act) against any losses, 
claims, damages, liabilities and expenses resulting from any untrue or 
alleged untrue statement of a material fact or any omission or alleged 
omission of a material fact required to be stated in the registration 
statement or prospectus or any amendment thereof or supplement thereto or 
necessary to make the statements therein not misleading, to the extent, but 
only to the extent, that such untrue statement or omission is contained in 
any written information or affidavit furnished by such holder specifically 
for such registration statement and then only to the extent of the net 
proceeds received by such holder from the sale of Registrable Securities 
pursuant to such registration statement in reliance upon such information. 
The holders of Registrable Securities will reimburse, to the extent of the 
net proceeds received by the holders of Registrable Securities, the Company, 
its officers, directors and controlling persons for any legal and other 
expenses as incurred in connection with investigation or defending any such 
losses, claims, damages, liabilities, expenses or actions.

       (c)     CONDUCT OF INDEMNIFICATION PROCEEDINGS.  Any Person entitled 
to indemnification hereunder will (i) give prompt notice to the indemnifying 
party of any claim with respect to which it seeks indemnification (but 
omission of such notice shall not relieve the indemnifying party from 
liability hereunder except to the extent such indemnifying party is actually 
prejudiced by such failure to give notice) and (ii) unless in such 
indemnified party's reasonable judgment a conflict of interest may exist 
between such indemnified and indemnifying parties with respect to such claim, 
permit such indemnifying party to assume the defense of such claim with 
counsel reasonably satisfactory to the indemnified party.  If such defense is 
not assumed by the indemnifying party, the indemnifying party will not be 
subject to any liability for any settlement made without its consent (but 
such consent will not be unreasonably withheld). No indemnifying party will 
consent to entry of any judgment or enter into any settlement which does not 
include as an unconditional term thereof the giving by the claimant or 
plaintiff to such indemnified party of an unconditional release from all 
liability in respect to such claim or litigation.  An indemnifying party who 
is not entitled to, or elects not to, assume the defense of a claim will not 
be obligated to pay the fees and expenses of more than one counsel for all 
parties indemnified by such indemnifying party with respect to such claim, 
unless an actual conflict of interest exists between such indemnified party 
and any other of such indemnified parties with respect to such claim, in 
which event the indemnifying party will be obligated to pay the fees and 
expenses of such 


                                      -11-
<PAGE>

additional counsel or counsels.

       (d)     CONTRIBUTION.  If the indemnification provided for in Section 
9(a) is unavailable or insufficient to hold harmless each of the indemnified 
parties against any losses, claims, damages, liabilities and expenses (or 
actions in respect thereof) to which such persons may become subject under 
the Securities Act, then the indemnifying party shall, in lieu of 
indemnifying each party entitled to indemnification hereunder, contribute to 
the amount paid or payable by such party as a result of such losses, claims, 
damages, liabilities or expenses in such proportion as is appropriate to 
reflect the relative fault of the indemnifying party on the one hand and such 
indemnified persons on the other in connection with the statements or 
omissions or alleged statements or omissions that resulted in such losses, 
claims, damages, liabilities or expenses. The relative fault of such persons 
shall be determined by reference to, among other things, whether the untrue 
or alleged untrue statement of a material fact, or omission or alleged 
omission to state a material fact, relates to information supplied by or 
concerning the indemnifying party on the one hand, or by such indemnified 
person on the other, and such person's relative intent, knowledge, access to 
information and opportunity to correct or prevent such statement or omission. 
The parties hereto agree that it would not be just and equitable if 
contribution pursuant to this Section 9(d) were determined by PRO RATA 
allocation or by any other allocation that does not take into account the 
equitable considerations referred to in this Section 9(d). No person guilty 
of fraudulent misrepresentation within the meaning of the Act shall be 
entitled to contribution from any person that is not guilty of such 
fraudulent misrepresentation.

10.    RULE 144.

       The Company covenants that it will file the reports required to be 
filed by it under the Securities Act and the Exchange Act and the rules and 
regulations adopted by the SEC thereunder (or, if the Company is not required 
to file such reports, it will, upon the request of any holder of Registrable 
Securities, make publicly available such information), and it will take such 
further action as any holder of Registrable Securities may reasonably 
request, all to the extent required from time to time to enable such holder 
to sell Registrable Securities without registration under the Securities Act 
within the limitation of the exemptions provided by (i) Rule 144 under the 
Securities Act, as such Rule may be amended from time to time, or (ii) any 
similar rule or regulation hereafter adopted by the SEC. Upon the request of 
any holder of Registrable Securities, the Company will deliver to such holder 
a written statement that it has complied with such requirements.

11.    PARTICIPATION IN UNDERWRITTEN REGISTRATIONS; LOCKUP.

       No Person may participate in any underwritten registration hereunder 
unless such Person (i) agrees to sell such Person's securities on the basis 
provided in any underwriting arrangements approved by the Persons entitled 
hereunder to approve such arrangements and (ii) completes and executes all 
customary questionnaires, powers of attorney, underwriting agreements and 
other documents required under the terms of such underwriting arrangements.  
If a holder of Registrable Securities is participating in a Piggyback 
Registration that is an underwritten registration, such holder will (if 
requested by the managing underwriter) enter into an agreement not to sell or 
otherwise transfer or dispose of any Registrable Securities or other 
securities of the Company held by such holder for a specified period of time 
(not to exceed 120 days) following the effective date of the registration 
statement. Such agreement shall be in writing in a form reasonably 
satisfactory to the 


                                      -12-
<PAGE>

holder, the Company and the managing underwriter.  The Company may impose 
stop transfer instructions with respect to the Registrable Securities or 
other securities subject to the foregoing restriction until the end of the 
lock-up period. 

12.    MISCELLANEOUS.

       (a)     RIGHT TO SUSPEND.  The Company may, by notice in writing to 
each holder of Registrable Securities, require the holder of Registrable 
Securities to suspend use of any prospectus included in a registration 
statement filed hereunder if the Company reasonably determines that it 
contains an untrue statement of a material fact or omits to state any 
material fact necessary to make the statements therein not misleading or that 
any transaction in which the Company is engaged or proposes to engage would 
require an amendment to such registration statement or a supplement to such 
prospectus (including any such amendment or supplement made through 
incorporation by reference to a report filed under Section 13 of the Exchange 
Act).  Each holder of Registrable Securities agrees that, upon receipt of any 
notice from the Company of the happening of any event of the kind described 
in this Section 12(a), such holder will forthwith discontinue disposition of 
Registrable Securities pursuant to the registration statement covering such 
Registrable Securities until such holder's receipt of the copies of a 
properly supplemented or amended prospectus, and, if so directed by the 
Company, such holder will deliver to the Company all copies, other than 
permanent file copies, then in such holder's possession, of the most recent 
prospectus covering such Registrable Securities at the time of receipt of 
such notice.  In the event the Company gives any such notice, the time period 
mentioned in Section 7(a)(iii), if applicable, will be extended by the number 
of days during the period from and including the date of the giving of such 
notice to and including the date when each seller of Registrable Securities 
covered by such registration statement has received the copies of such 
supplemented or amended prospectus.  The Company agrees to use its reasonable 
best efforts to cause any suspension of use of any prospectus pursuant to 
this paragraph to be as short a period of time as possible.

       (b)     REMEDIES.  Each holder of Registrable Securities, in addition 
to being entitled to exercise all rights granted by law, including recovery 
of damages, will be entitled to specific performance of its rights under this 
Agreement.  

       (c)     AMENDMENTS AND WAIVERS.  The provisions of this Agreement may 
not be amended, modified or supplemented, and waivers or consents to 
departures from the provisions hereof may not be given unless the Company has 
obtained the written consent of at least a Majority of the outstanding 
Registrable Securities.

       (d)     REGISTRABLE SECURITIES HELD BY THE COMPANY OR ITS AFFILIATES. 
Whenever the consent or approval of holders of all or any specified 
percentage of Registrable Securities is required hereunder, Registrable 
Securities held by the Company or any of its affiliates (other than a 
Purchaser if it is such an affiliate) will not be counted in determining 
whether such consent or approval was given by such holders.

       (e)     NOTICES.  All notices hereunder shall be in writing and shall 
be effective (a) on the day on which delivered if delivered personally or 
transmitted by telex or telegram or telecopier with evidence of receipt, (b) 
one business day after the date on which the same is delivered to a 
nationally 


                                      -13-
<PAGE>

recognized overnight courier service with evidence of receipt, or (c) five 
business days after the date on which the same is deposited, postage prepaid, 
in the U.S. mail, sent by certified or registered mail, return receipt 
requested, and addressed to the party to be notified at the address set forth 
in the Purchase Agreement for the Company, or at the address for the holder 
of the Registrable Securities set forth in a registry maintained by the 
Company, or at such other address and/or telecopy or telex number and/or to 
the attention of such other person as the Company or the holder of the 
Registrable Securities may designate by ten-day advance written notice.

       (f)     SUCCESSORS AND ASSIGNS; TRANSFER OF REGISTRATION RIGHTS.  This 
Agreement will inure to the benefit of and be binding upon the successors and 
assigns of each of the parties; PROVIDED HOWEVER that the registration rights 
granted by this Agreement may be transferred only (i) by operation of law, or 
(ii) to any Person to whom the Purchaser sells or otherwise transfers 
Registrable Securities who (x) upon such transfer, will hold 1,000,000 or 
more Registrable Securities (such number of shares to be appropriately 
adjusted in the event of any stock dividend or stock split or in connection 
with a combination of shares, recapitalization, reclassification, merger, 
consolidation or other reorganization) and (y) agrees to be bound by the 
terms and conditions of this Agreement and signs an addendum to this 
Agreement to such effect.  

       (g)    COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts and by the parties hereto in separate counterparts, each of 
which when so executed will be deemed to be an original and all of which 
taken together will constitute one and the same agreement.

       (h)     HEADINGS.  The headings in this Agreement are for convenience 
of reference only and will not limit or otherwise affect the meaning hereof.

       (i)     GOVERNING LAW; JURISDICTION.  This Agreement will be governed 
by and construed in accordance with the laws of the State of Texas, without 
giving effect to conflict of law principles.  Any holder of Registrable 
Securities may bring any action or proceeding to enforce or arising out of 
this Agreement or in the instruments and agreements annexed hereto in any 
court of competent jurisdiction.

       (j)     SEVERABILITY.  In the event that any one or more of the 
provisions contained herein, or the application thereof in any circumstance, 
is held invalid, illegal or unenforceable, the validity, legality and 
enforceability of any such provision in every other respect and of the 
remaining provisions contained herein will not be affected or impaired 
thereby.

       (k)     ENTIRE AGREEMENT.  This Agreement is intended by the parties 
as a final expression of their agreement and intended to be a complete and 
exclusive statement of the agreement and understanding of the parties hereto 
in respect of the subject matter contained herein.  There are no 
restrictions, promises, warranties or undertakings, other than those set 
forth or referred to herein with respect to the registration rights granted 
by the Company with respect to the securities sold pursuant to the Purchase 
Agreement.  This Agreement supersedes all prior agreements and understandings 
between the parties with respect to such subject matter.


                                      -14-
<PAGE>

       (l)     ATTORNEY'S FEES.  In any action or proceeding brought to enforce
any provision of this Agreement, or where any provision hereof or thereof is
validly asserted as a defense, the successful party will be entitled to recover
reasonable attorney's fees in addition to any other available remedy.

       (m)     EXCHANGE SECURITIES.    If any securities are issued in exchange
for the Shares pursuant to the provisions of Section 5.11 of the Purchase
Agreement, this Agreement shall be interpreted to provide for registration
rights equivalent to those provided hereunder with respect to any shares of
common stock (or any securities into which such common stock is exchanged,
converted, reclassified or recapitalized) of the Company issuable upon
conversion, exercise or exchange of such securities.


                                      -15-
<PAGE>

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


                              INPUT/OUTPUT INC.


                              By: /s/ W.J. Zeringue                        
                                  -----------------------------------------
                              Name:     W. J. Zeringue                     
                              Title: Chief Executive Officer


                              SCF-IV, L.P.

                              By: SCF-IV, G.P., Limited Partnership,
                              its General Partner

                              By:  L. E. Simmons & Associates, Incorporated,
                              its General Partner


                              By: /s/ David C. Baldwin                     
                                  -----------------------------------------
                                   Managing Director




                                      -16-


<PAGE>

                     FIRST AMENDMENT TO RIGHTS AGREEMENT 
                       BY AND BETWEEN INPUT/OUTPUT, INC.
              AND HARRIS TRUST AND SAVINGS BANK AS RIGHTS AGENT


     This First Amendment to Rights Agreement ("First Amendment"), dated 
effective as of April 21, 1999, evidences the amendment of that certain 
Rights Agreement (herein so called) by and between Input/Output, Inc. (the 
"Company") and Harris Trust and Savings Bank as Rights Agent dated as of 
January 17, 1997.

                                    RECITALS

     WHEREAS, Section 27 of the Rights Agreement provides that the Board of 
Directors of the Company may from time to time supplement or amend the Rights 
Agreement in such manner as the Board of Directors deems necessary or 
desirable; and 

     WHEREAS, the Company and SCF-IV, L.P., a Delaware limited partnership, 
intend to enter into that certain Purchase Agreement (the "Purchase 
Agreement") pursuant to which the Company will, among other things, issue 
shares of its Series B Preferred Stock, and upon exercise of an option by 
SCF-IV, L.P. as provided for therein, shares of its Series C Preferred Stock, 
each of which is convertible into the Company's Common Stock; and

     WHEREAS, the Board of Directors of the Company has approved this First 
Amendment by action taken at a meeting duly held on April 21, 1999;

     NOW, THEREFORE, for and in consideration of the premises and the mutual 
agreements herein set forth, the parties hereby agree, at the direction of 
the Company, as follows:

     1.   Section 1(a) of the Rights Agreement is hereby amended to modify the
definition of "Acquiring Person" by adding a sentence to the end of such
definition to read as follows:

     "Notwithstanding any provision to the contrary contained herein,
     neither SCF nor any of its Affiliates shall be deemed to be an
     Acquiring Person as a result of any combination of the following
     actions: (i) the execution and delivery of the Purchase Agreement,
     (ii) the acquisition of shares of Series B Preferred Stock and/or
     Series C Preferred Stock of the Company in accordance with the terms
     of the Purchase Agreement, (iii) the acquisition of shares of Common
     Stock of the Company upon conversion of the shares of Series B
     Preferred Stock or Series C Preferred Stock, (iv) the acquisition  of
     securities of the Company in accordance with the terms of Section 5.11 

<PAGE>

     of the Purchase Agreement (including any Common Stock issuable upon
     conversion, exercise or exchange thereof), or (v) an acquisition of
     additional shares of Common Stock of the Company to the extent
     permitted by the terms of Section 5.12(a) of the Purchase Agreement."

     2.   Section 1 of the Rights Agreement shall be further revised by 
adding the following additional definitions thereto:

     "PURCHASE AGREEMENT" shall mean that certain Purchase Agreement to be 
entered into by and between SCF and the Company.

     "SCF" shall mean SCF-IV, L.P., a Delaware limited partnership.

     "SERIES B PREFERRED STOCK" shall mean the Company's Series B Preferred 
Stock, $.01 par value per share, to be issued pursuant to the terms of the 
Purchase Agreement.

     "SERIES C PREFERRED STOCK" shall mean the Company's Series C Preferred 
Stock, $.01 par value per share, which may be issued pursuant to the terms of 
the Purchase Agreement.

     3.   The first sentence of Section 3(a) of the Rights Agreement is 
hereby amended by adding the following sentence following the end of such 
sentence:

     "PROVIDED HOWEVER, that in no event shall a Stock Acquisition Date or
     a Distribution Date be deemed to occur as a result of (i) the
     execution and delivery of the Purchase Agreement by SCF and the
     Company, (ii) the acquisition by SCF of shares of Series B Preferred
     Stock and/or  Series C Preferred Stock of the Company in accordance
     with the terms of the Purchase Agreement, (iii) the acquisition by SCF
     of shares of Common Stock of the Company upon conversion of the shares
     of Series B Preferred Stock or Series C Preferred Stock, (iv) the
     acquisition by SCF of securities of the Company in accordance with the
     terms of Section 5.11 of the Purchase Agreement (including any Common
     Stock issuable upon conversion, exercise or exchange thereof), or (v)
     the acquisition by SCF of additional shares of Common Stock of the
     Company to the extent permitted by the terms of Section 5.12(a) of the
     Purchase Agreement."

     4.   This First Amendment shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of the State of Delaware applicable to
contracts to be made and performed entirely within the State of Delaware.


                                      -2-
<PAGE>

     5.   This First Amendment may be executed in any number of counterparts 
and each of such counterparts shall for all purposes be deemed to be an 
original, and all such counterparts shall together constitute but one and the 
same instrument.

     6.   Except to the extent expressly amended by the First Amendment, the 
Rights Agreement shall remain in full force and effect.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
duly executed and attested, all as of the day and year first above written.


                                        INPUT/OUTPUT, INC.

Attest:

By: /s/ Chris Wolfe                     By: /s/ W.J. Zeringue              
    -------------------------------         -------------------------------
Title: Vice President                   Title: Chief Executive Officer     
       ----------------------------            ----------------------------


                                        HARRIS TRUST AND SAVINGS BANK,
                                        as Rights Agent

Attest:

By: /s/ Lorraine Rodewald               By: /s/ Ray Rosenbaum              
    -------------------------------         -------------------------------

Title: Assistant Vice President         Title: Vice President              
       ----------------------------            ----------------------------


                                      -3-


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