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                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.


FIRST:  The name of the Corporation is Tom Brown, Inc.

SECOND:  The address of its registered office in the State of Delaware is 1209
Orange Street, in the City of Wilmington, County of New Castle 19801.  The name
of its registered agent at such address is The Corporation Trust Company.

THIRD:  The nature of the business of the Corporation and the objects and
purposes and business thereof proposed to be transacted, promoted or carried on
are as follows:

         To transact any and all lawful act or activity for which a corporation
         may be incorporated under the laws of the State of Delaware.

FOURTH:  The total number of shares of all classes that the Corporation shall
have authority to issue is 250,000,000, of which 50,000,000 shares shall be
Preferred Stock, par value $.10 per share, and 200,000,000 shares shall be
Common Stock, $.10 par value per share.  All of such shares shall, upon
issuance thereof, be fully paid and nonassessable.

         The designations, preferences, limitations and relative rights of the
shares of each class that the Corporation shall have authority to issue are as
follows:

         A.      Preferred Stock.  The Board of Directors is hereby expressly
                 vested with the authority to adopt a resolution or resolutions
                 providing for the issue of authorized but unissued shares of
                 Preferred Stock, which shares may be issued from time to time
                 in one or more series and in such amounts as may be determined
                 by the Board of Directors in such resolution or resolutions.
                 The designations, preferences, limitations or relative rights
                 of the Preferred Stock and the qualifications, limitations or
                 restrictions, if any, of such preferences and/or rights
                 (collectively, the "Series Terms") may vary between series in
                 any and all respects and shall be such as are stated and
                 expressed in a resolution or resolutions providing for the
                 creation or revision of such Series Terms set forth in a
                 Certificate of Designations (a "Preferred Stock Series
                 Resolution") adopted by the Board of Directors; provided that
                 all shares of any one series of Preferred Stock so designated
                 by the Board of Directors shall be identical in all respects
                 except that shares of any one series issued at different times
                 may differ as to the dates from which dividends thereon may be
                 cumulative.  The powers of the Board of Directors with respect
                 to the Series Terms of a particular series shall include, but
                 not be limited to, determination of the following:
<PAGE>   2

                 1.  The right to receive dividends, if any, and the rate,
                     dates, terms and other conditions on which such dividends 
                     shall be payable;
                     
                 2.  The nature of the dividend payable, if any, with respect 
                     to shares of such series as cumulative, noncumulative or 
                     partially cumulative;
                     
                 3.  The redemption rights of such series including the price 
                     at and the terms and conditions on which such shares may 
                     be redeemed;
                     
                 4.  The amount payable upon shares in the event of involuntary
                     liquidation;
                     
                 5.  The amount payable upon shares in the event of voluntary 
                     liquidation;
                     
                 6.  Sinking fund provisions for the redemption or purchase of 
                     shares;
                     
                 7.  The terms and conditions on which shares may be converted,
                     if the shares of any series are issued with the privilege 
                     of conversion;
                     
                 8.  Voting rights, if any; and
                     
                 9.  Repurchase obligations of the Corporation with respect to 
                     the shares of each series.

                 Any of the Series Terms, including voting rights, of any
                 series may be made dependent upon facts ascertainable outside
                 this Certificate of Incorporation and the Preferred Stock
                 Series Resolution, provided that the manner in which such
                 facts shall operate upon such Series Terms is clearly and
                 expressly set forth herein or in the Preferred Stock Series
                 Resolution.

                 Subject to the provisions of this Paragraph Fourth, shares of
                 one or more series of Preferred Stock may be authorized or
                 issued from time to time as shall be determined by and for
                 such consideration as shall be fixed by the Board of
                 Directors, in an aggregate amount not exceeding the total
                 number of shares of Preferred Stock authorized herein.  Except
                 in respect of Series Terms fixed by the Board of Directors as
                 permitted hereby, all shares of Preferred Stock shall be of
                 equal rank and shall be identical.

         B.     Common Stock.

                 1.  Dividends.  Subject to the provisions of any Preferred 
                     Stock Series Resolution, the Board of Directors may, in 
                     its discretion, out of funds
                     




                                       2
<PAGE>   3
                     legally available for the payment of dividends and at such
                     times and in such manner as determined by the Board of 
                     Directors, declare and pay dividends on the Common Stock 
                     of the Corporation.

                     No dividend (other than a dividend in capital stock
                     ranking on a parity with the Common Stock or cash in lieu
                     of fractional shares with respect to such stock dividend)
                     shall be declared or paid on any share or shares of any
                     class of stock or series thereof ranking on a parity with
                     the Common Stock in respect of payment of dividends for
                     any dividend period unless there shall have been declared,
                     for the same dividend period, like proportionate dividends
                     on all shares of Common Stock then outstanding.
        
                 2.  Liquidation.  In the event of any liquidation, dissolution
                     or winding up of the Corporation, whether voluntary or
                     involuntary, after payment or provision for payment of the
                     debts and other liabilities of the Corporation and after
                     payment of any preferential amount due to the holders of
                     any other class or series of stock, the holders of the
                     Common Stock shall be entitled to receive ratably any or
                     all assets remaining to be paid or distributed.
        
                 3.  Voting Rights.  Subject to any special voting rights set
                     forth in any Preferred Stock Series Resolution, the
                     holders of the Common Stock of the Corporation shall be
                     entitled at all meetings of shareholders to one vote for
                     each share of such stock held by them.
        
         C.      Prior, Parity or Junior Stock.  Whenever reference is made in
                 this Paragraph Fourth or in any Preferred Stock Series
                 Resolution to shares "ranking prior to" another class or
                 series of stock or "on a parity with" another class or series
                 of stock, such reference shall mean and include all other
                 shares of the Corporation in respect of which the rights of
                 the holders thereof as to the payment of dividends or as to
                 distributions in the event of a voluntary or involuntary
                 liquidation, dissolution or winding up of the affairs of the
                 Corporation are given preference over, or rank on an equality
                 with, as the case may be, the rights of the holders of such
                 other class or series of stock.  Whenever reference is made to
                 shares "ranking junior to" another class of stock, such
                 reference shall mean and include all shares of the Corporation
                 in respect of which the rights of the holders thereof as to
                 the payment of dividends and as to distributions in the event
                 of a voluntary or involuntary liquidation, dissolution or
                 winding up of the affairs of





                                       3
<PAGE>   4
                 the Corporation are junior and subordinate to the rights of the
                 holders of such class or series of stock.

                 Except as otherwise provided herein or in any Preferred Stock
                 Series Resolution, each series of Preferred Stock ranks on a
                 parity with each other series and each series ranks prior to
                 the Common Stock.  Common Stock ranks junior to the Preferred
                 Stock.

         D.      Liquidation.  For the purposes of Section (2) of Section B of
                 this Paragraph Fourth and for the purpose of the comparable
                 sections of any Preferred Stock Series Resolution, the merger
                 or consolidation of the Corporation into or with any other
                 corporation, or the merger of any other corporation into it,
                 or the sale, lease or conveyance of all or substantially all
                 the assets, property or business of the Corporation, shall not
                 be deemed to be a liquidation, dissolution or winding up of
                 the Corporation.

         E.      Reservation and Retirement of Shares.  The Corporation shall
                 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 any series of Preferred
                 Stock having conversion privileges from time to time
                 outstanding are convertible.

                 Unless otherwise provided in a Preferred Stock Series
                 Resolution with respect to a particular series of Preferred
                 Stock, all shares of Preferred Stock redeemed or acquired (as
                 a result of conversion or otherwise) shall be retired and
                 restored to the status of authorized but unissued shares.

         F.      Preemptive Rights.

                 1.  No holder of shares of Preferred Stock or Common Stock of 
                     the Corporation shall have any preemptive right to
                     purchase or subscribe for or receive any shares of any
                     class, or series thereof, of stock of the Corporation,
                     whether now or hereafter authorized, or any warrants,
                     options, bonds, debentures or other securities convertible
                     into, exchangeable for or carrying any right to purchase
                     any shares of any class, or series thereof, of stock; but
                     such additional shares of stock and such warrants,
                     options, bonds, debentures or other securities convertible
                     into, exchangeable for or carrying any right to purchase
                     any shares of any class, or series thereof, of stock may
                     be issued or disposed of by the Board of Directors to such
                     persons, and on such terms and for such lawful
        




                                       4
<PAGE>   5
                     consideration, as in its discretion it shall deem 
                     advisable.

                 2.  The stockholders of the Corporation shall have no
                     rights to acquire the shares of Common Stock of the
                     Corporation now held in the treasury of the Corporation or
                     any shares of Common Stock of the Corporation hereafter
                     acquired by the Corporation and held as treasury shares.
        
         G.      No Cumulative Voting.  Cumulative voting shall not be allowed
                 in the election of Directors or for any other purpose.

         H.      Repurchases of Capital Stock.  The Corporation may, without
                 shareholder approval, purchase, directly or indirectly, its
                 own shares to the extent permitted by the Delaware General
                 Corporation Law.

FIFTH:   The names and mailing address of the incorporators are:

<TABLE>
<CAPTION>
                 Name                               Address
                 ----                               -------
           <S>                                 <C>
           Thomas C. Brown                     500 Empire Plaza
                                               Midland, Texas 79701

           Donald L. Evans                     500 Empire Plaza
                                               Midland, Texas 79701
</TABLE>

SIXTH:  The name and mailing addresses of the persons who are to serve as
directors until the first annual meeting of stockholders or until their
successors are duly elected and qualified are:

<TABLE>
<CAPTION>
                      Name                               Address
                      ----                               -------
               <S>                         <C>
               Thomas C. Brown             500 Empire Plaza
                                           Midland, Texas 79701

               Donald L. Evans             500 Empire Plaza
                                           Midland, Texas 79701

               Joe G. Roper                5609 West Industrial
                                             Boulevard
                                           Midland, Texas 79701
</TABLE>

SEVENTH:  The Corporation is to have perpetual existence.

EIGHTH:  The Board of Directors shall have power to enact, alter, amend and
repeal bylaws not inconsistent with the laws of the State of Delaware and this
Certificate of Incorporation.

NINTH:  Limitation of Certain Liability of Directors.  A director of the
Corporation shall not be personally liable to the Corporation or its
stockholders for monetary damages for breach of





                                       5
<PAGE>   6
fiduciary duty as a director, except for liability (i) for any breach of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or
a knowing violation of law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit.  In addition to the circumstances in which a
director of the Corporation is not personally liable as set forth in the
preceding sentence, a director shall not be liable to the fullest extent
permitted by any amendment to the Delaware General Corporation law hereafter
enacted that further limits the liability of a director.

         Any repeal or modification of the foregoing paragraph by the
stockholders of the Corporation shall not adversely affect any right or
protection of a director of the Corporation with respect to any matter
occurring or any cause of action, suit or claim that, but for this Article
Ninth, would accrue or arise, prior to the time of such repeal or modification.

TENTH:  Indemnification and Insurance.

         A.      Right to Indemnification.  Each person who was or is made a
                 party or is threatened to be made a party to or is involved in
                 any action, suit or proceeding, whether civil, criminal,
                 administrative or investigative (hereinafter a "proceeding"),
                 by reason of the fact that he or she, or a person of whom he
                 or she is the legal representative, is or was a director or
                 officer, of the Corporation or is or was serving at the
                 request of the Corporation as a director, officer, employee or
                 agent of another corporation or of a partnership, joint
                 venture, trust or other enterprise, including service with
                 respect to employee benefit plans, whether the basis of such
                 proceeding is alleged action in an official capacity as a
                 director, officer, employee or agent or in any other capacity
                 while serving as a director, officer, employee or agent, shall
                 be indemnified and held harmless by the Corporation to the
                 fullest extent authorized by the Delaware General Corporation
                 Law, as the same exists or may hereafter be amended (but, in
                 the case of any such amendment, only to the extent that such
                 amendment permits the Corporation to provide broader
                 indemnification rights than said law permitted the Corporation
                 to provide prior to such amendment), against all expense,
                 liability and loss (including attorneys' fees, judgments,
                 fines, ERISA excise taxes or penalties and amounts paid or to
                 be paid in settlement) reasonably incurred or suffered by such
                 person in connection therewith and such indemnification shall
                 continue as to a person who has ceased to be a director,
                 officer, employee or agent and shall inure to the benefit of
                 his or her heirs, executors and administrators; provided,
                 however, that, except as provided in paragraph (b) hereof, the
                 Corporation shall





                                       6
<PAGE>   7
                 indemnify any such person seeking indemnification in
                 connection with a proceeding (or part thereof) initiated by
                 such person only if such proceeding (or part thereof) was
                 authorized by the board of directors of the Corporation.  The
                 right to indemnification conferred in this Section shall be a
                 contract right and shall include the right to be paid by the
                 Corporation the expenses incurred in defending any such
                 proceeding in advance of its final disposition; provided,
                 however, that, if the Delaware General Corporation Law
                 requires, the payment of such expenses incurred by a director
                 or officer in his or her capacity as a director of officer
                 (and not in any other capacity in which service was or is
                 rendered by such person while a director or officer,
                 including, without limitation, service to an employee benefit
                 plan) in advance of the final disposition of a proceeding,
                 shall be made only upon delivery to the Corporation of an
                 undertaking, by or on behalf of such director or officer, to
                 repay all amounts so advanced if it shall ultimately be
                 determined that such director or officer is not entitled to be
                 indemnified under this Paragraph A or otherwise.  The
                 Corporation may, by action of its Board of Directors, provide
                 indemnification to employees and agents of the Corporation
                 with the same scope and effect as the foregoing
                 indemnification of directors and officers.
        
         B.      Right of Claimant to Bring Suit.  If a claim under Paragraph A
                 of this Paragraph Tenth is not paid in full by the Corporation
                 within ninety days after a written claim has been received by
                 the Corporation, the claimant may at any time thereafter bring
                 suit against the Corporation to recover the unpaid amount of
                 the claim and, if successful in whole or in part, the claimant
                 shall be entitled to be paid also the expense of prosecuting
                 such claim.  It shall be a defense to any such action (other
                 than an action brought to enforce a claim for expenses
                 incurred in defending any proceeding in advance of its final
                 disposition where the required undertaking, if any is
                 required, has been tendered to the Corporation) that the
                 claimant has not met the standards of conduct which make it
                 permissible under the Delaware General Corporation Law for the
                 Corporation to indemnify the claimant for the amount claimed,
                 but the burden of proving such defense shall be on the
                 Corporation.  Neither the failure of the Corporation
                 (including its Board of Directors, independent legal counsel,
                 or its stockholders) to have made a determination prior to the
                 commencement of such action that indemnification of the
                 claimant is proper in the circumstances because he or she has
                 met the applicable standard of conduct set forth in the
                 Delaware General Corporation Law, nor an actual determination
                 by the Corporation (including its Board of Directors,
                 independent legal counsel, or its





                                       7
<PAGE>   8
                 stockholders) that the claimant has not met such applicable
                 standard or conduct, shall be a defense to the action or
                 create a presumption that the claimant has not met the
                 applicable standard of conduct.
        
          C.     Non-Exclusivity of Rights.  The right to indemnification and
                 the payment of expenses incurred in defending a  proceeding in
                 advance of its final disposition conferred in this Paragraph
                 shall not be exclusive of any other right which any person may
                 have or hereafter acquire under any statute, provision of the
                 Certificate of Incorporation, bylaw, agreement, vote of
                 stockholders or disinterested directors or otherwise.

          D.     Insurance.  The Corporation may maintain insurance, at its
                 expense, to protect itself and any director, officer, employee
                 or agent of the Corporation or another corporation,
                 partnership, joint venture, trust or other enterprise against
                 any such expense, liability  or loss, whether or not the
                 Corporation would have the power to indemnify such person
                 against such expense, liability or loss under the Delaware
                 General Corporation Law.

ELEVENTH:  The Corporation reserves the right to amend, alter, change or repeal
any provision contained in this Certificate of Incorporation, in the manner now
or hereafter prescribed by statute, and all rights conferred upon stockholders
herein are granted subject to this reservation.

         WE, THE UNDERSIGNED, being each of the incorporators hereinbefore
named, for the purpose of forming a corporation pursuant to the General
Corporation Law of the State of Delaware,  do make this certificate, hereby
declaring and certifying that this is our act and deed and the facts herein
stated are true, and accordingly, have hereunto set our hands this 25th day of
February, 1987.


                                        /s/ Thomas C. Brown
                                        ------------------------------
                                        Thomas C. Brown


                                        /s/ Donald L. Evans
                                        ------------------------------
                                        Donald L. Evans







                                       8
<PAGE>   9

                                TOM BROWN, INC.
                    CERTIFICATE OF DESIGNATIONS, PREFERENCES
                     AND RIGHTS OF SERIAL PREFERRED STOCK -
                       SERIES A NON-VOTING CONVERTIBLE 6%
                           CUMULATIVE PREFERRED STOCK


         The undersigned, President and Secretary, respectively, of Tom Brown,
Inc., a Delaware corporation (the "Company"), certify that pursuant to
authority granted to and vested in the Board of Directors of the Company by
provisions of the Certificate of Incorporation of the Company, the Board of
Directors has duly adopted the following resolutions creating a series of
serial preferred stock of the Company designated as the Series A Non-Voting
Convertible 6% Cumulative Preferred Stock:

         "RESOLVED, That the Board of Directors of Tom Brown, Inc.  (the
         "Company"), in the exercise of its best business judgment and
         intending to act in full compliance with the applicable provisions of
         the Company's Certificate of Incorporation and Bylaws and the
         provisions of the Delaware General Corporation Law, hereby establishes
         a series of Preferred Stock, par value $0.10 per share, of the Company
         designated as "Series A Non-Voting Convertible 6% Cumulative Preferred
         Stock" (the "Series A Shares"), and the number of Series A Shares
         which the Company is authorized to issue from time to time shall be
         22,000,000 and the designations, preferences, limitations, and
         relative rights, and qualifications, limitations and restrictions, of
         the Series A Shares shall be as follows:

         1.      Liquidation.  The Series A Shares shall be preferred as to
         assets over Junior Shares so that, in the event of the voluntary or
         involuntary liquidation, dissolution or winding up of the Company, the
         holders of the Series A Shares shall be entitled, in conjunction with
         any provision then being made for the holders of Parity Shares, if
         any, to have set apart for them or to be paid out of the assets of the
         Company, after payment or provision for payment of the debts and other
         liabilities of the Company and after provision for the holders of
         Senior Shares, if any, but before any distribution is made to or set
         apart for the holders of Junior Shares, an amount in cash equal to
         $1.1364 per Series A Share (as adjusted for any stock split, reverse
         stock split, stock dividend or similar event resulting in a change in
         the Series A Shares) (the "Liquidation Value"), together with all
         dividends accrued on such Series A Shares to the date of payment,
         irrespective of whether such dividends were earned, declared or
         legally available, and the holders of the Series A Shares shall not be
         entitled to any further payment in connection with the voluntary or
         involuntary liquidation, dissolution or winding up of the Company
<PAGE>   10
         except as expressly provided for in this resolution.  If, upon such
         liquidation, dissolution or winding up of the Company, the assets of
         the Company available for distribution to the holders of the Series A
         Shares and the holders of Parity Shares, if any, shall be insufficient
         to permit the distribution in full of the amounts receivable as
         aforesaid by the holders of the Series A Shares and the amounts
         receivable by the holders of Parity Shares, if any, then all such
         assets of the Company shall be distributed ratably among the holders
         of the Series A Shares and the holders of Parity Shares, if any, in
         proportion to the amounts that each would have been entitled to
         receive if such assets were sufficient to permit distribution in full
         as aforesaid.  Neither the consolidation or merger of the Company with
         or into any corporation or corporations, nor the sale, lease or
         transfer by the Company of all or any part of its assets, nor the
         reduction of the authorized or issued shares of the Company of any
         class, whether now or hereafter authorized, shall be deemed to be a
         liquidation, dissolution or winding up of the Company for the purposes
         of this Section 1.  Written notice of any voluntary or involuntary
         liquidation, dissolution or winding up of the Company, setting the
         payment date and the place where the amounts to be distributed shall
         be paid and containing a reference to the conversion option granted by
         Section 2 hereof, shall be given not less than thirty (30) days prior
         to the payment date stated therein to the holders of record of the
         Series A Shares at their respective addresses as the same shall appear
         on the stock ledger of the Company.

         2.      Conversion.

                 (a)  Subject to the terms and conditions of this Section 2,
         the Series A Shares shall be convertible, at any time and from time to
         time, at the option of the holder thereof, into Common Shares by
         surrender of the certificate or certificates for the Series A Shares
         to be so converted, duly endorsed, at the principal office of the
         Company (or at such other place or places as may be designated by the
         Company from time to time by notice sent to the holders of the Series
         A Shares at their respective addresses as the same shall appear on the
         stock ledger of the Company) or at the corporate trust office of any
         transfer agent for the Series A Shares at any time during normal
         business hours, together with notice that the holder elects to convert
         such Series A Shares, or a stated number of such shares, in accordance
         with the provisions of this Section 2.  Such notice shall also state
         the name or names (with addresses) in which the certificate or
         certificates for Common Shares shall





                                       2
<PAGE>   11
         be issued.  The number of Common Shares that any such holder shall
         receive in return for each Series A Share converted by such holder
         shall be computed by dividing (x) $1.1364 (as adjusted for any stock
         split, reverse stock split, stock dividend or similar event resulting
         in a change in the Series A Shares) by (y) the Conversion Price then
         in effect.

                 (b) As promptly as practicable after exercise by any holder of
         Series A Shares of such holder's option to convert Series A Shares
         pursuant to the provisions of this Section 2, the Company shall
         deliver or cause to be delivered to or upon the written order of such
         holder one or more certificates representing the number of Common
         Shares issuable upon such conversion, issued in such name or names as
         such holder may direct, together with, if the certificate or
         certificates surrendered evidence a greater number of Series A Shares
         than the number of Series A Shares to be converted, one or more
         certificates evidencing the Series A Shares not to be converted,
         issued in such name or names as such holder may direct, and
         accompanied by any cash in respect of any fractional interest in a
         Common Share issuable upon such conversion.  Each such conversion
         shall be deemed to have been made immediately prior to the close of
         business on the day the option to convert is exercised, and all rights
         of the converting holder as the holder of the Series A Shares
         surrendered for conversion shall cease at such time and the person or
         persons in whose name or names the certificate or certificates for the
         Common Shares issuable upon conversion are to be issued shall be
         treated for all purposes as having become the record holder or holders
         thereof at such time, except that, if the date of exercise of the
         conversion option is a date when the stock ledger of the Company is
         closed, such person or persons shall be deemed to have become the
         holder or holders of such shares at the close of business on the next
         succeeding date on which the stock ledger is open.

                 (c)  The initial Conversion Price shall be $0.2841.  The
         Conversion Price shall be subject to adjustment as follows:

                          A.  If the Company shall pay a dividend or make any
                 other distribution to all holders of the Common Shares payable
                 in Common Shares or shall subdivide its outstanding Common
                 Shares into a greater number of shares, the Conversion Price
                 in effect immediately prior thereto shall be proportionately
                 reduced, and if the Company shall combine its outstanding





                                       3
<PAGE>   12
                 Common Shares into a smaller number of shares, the Conversion
                 Price in effect immediately prior thereto shall be
                 proportionately increased. An adjustment made pursuant to this
                 subdivision A shall become effective as of the date the record
                 is taken for such dividend or distribution or such subdivision
                 or combination or, if no record is taken, the date as of which
                 the record holders of Common Shares entitled to such payment
                 or other distribution or to participate in such subdivision or
                 combination are determined.
        
                          B.  If on or after December 24, 1986, the Company
                 issues or sells, or in accordance with subdivision C below is
                 deemed to have issued or sold, any Common Shares (other than
                 (i) Common Shares issued or sold pursuant to the exercise of
                 options, warrants or rights outstanding as of December 24,
                 1986, (ii) by reason of the grant of options under the Tom
                 Brown, Inc. Incentive Stock Option Plan, to purchase up to a
                 total of 600,000 Common Shares (as adjusted pursuant to the
                 provisions of the plan designed to protect against dilution)
                 at a per share purchase price of not less than 100% of the
                 fair market value of a Common Share on the date of grant and
                 Common Shares issued or sold pursuant to the exercise of such
                 options, (iii) issuances or sales of Common Shares for which
                 an adjustment of the Conversion Price is made pursuant to
                 subdivision A above, or (iv) pursuant to transactions for
                 which appropriate provision is made pursuant to Section 2(d)
                 or 2(e) hereof) for a consideration per share less than the
                 Conversion Price or the Market Price, as the case may be, in
                 effect immediately prior to such time, then forthwith upon
                 such issuance or sale the Conversion Price shall be adjusted
                 to that Conversion Price determined by multiplying the
                 Conversion Price then in effect by a fraction (1) the
                 numerator of which shall be the number of Common Shares
                 outstanding immediately prior to the issuance or sale of such
                 additional Common Shares plus the number of Common Shares
                 which the aggregate consideration received by the Company for
                 the total number of Common Shares so issued or sold would
                 purchase at the Conversion Price or the Market Price, as the
                 case may be, in effect immediately before such





                                       4
<PAGE>   13
                 adjustment, and (2) the denominator of which shall be the
                 number of Common Shares outstanding immediately after the
                 issuance or sale of such Common Shares.
        
                          C.  For the purposes of determining the adjusted
                 Conversion Price under subdivision B above, the following
                 shall be applicable:

                                  (i) If on or after December 24, 1986, the
                          Company in any manner grants any right or option to
                          subscribe for or to purchase Common Shares or any
                          stock or other securities convertible into or
                          exchangeable for Common Shares (such rights or
                          options being herein called "Options" and such
                          convertible or exchangeable stock or securities being
                          herein called "Convertible Securities") and the
                          lowest price per share for which any one Common Share
                          is issuable upon the exercise of any such Option or
                          upon conversion or exchange of any such Convertible
                          Security is less than the Conversion Price or the
                          Market Price, as the case may be, in effect
                          immediately prior to the time of the granting of such
                          Option, then the Conversion Price shall be adjusted
                          as provided in subdivision B above on the basis that
                          the maximum number of Common Shares issuable upon the
                          exercise of all such Options and upon conversion or
                          exchange of all such Convertible Securities shall be
                          deemed to have been issued as of the date of such
                          grant and the aggregate consideration for such
                          maximum number of additional Common Shares shall be
                          deemed to be the minimum consideration received or
                          receivable by the Company (if any) upon the issuance
                          of such additional Common Shares on the exercise of
                          the Options or the conversion or exchange of the
                          Convertible Securities.  For the purposes of this
                          paragraph (i), the "lowest price per share for which
                          any one Common Share is issuable" shall be equal to
                          the sum of the lowest amounts of consideration (if
                          any) received or receivable by the Company with
                          respect to any one Common Share upon the granting of
                          the Option, upon the exercise of the Option, and upon





                                       5
<PAGE>   14
                          the conversion or exchange of the Convertible
                          Security.  No further adjustment of the Conversion
                          Price shall be made upon the actual issue of such
                          Common Shares or of such Convertible Securities upon
                          the exercise of such Option or upon the actual issue
                          of such Common Shares upon conversion or exchange of
                          such Convertible Securities.
        
                                  (ii) If on or after December 24, 1986, the
                          Company in any manner issues or sells any Convertible
                          Security and the lowest price per share for which any
                          one Common Share is issuable upon conversion or
                          exchange thereof is less than the Conversion Price or
                          the Market Price, as the case may be, in effect
                          immediately prior to the time of such issuance or
                          sale, then the Conversion Price shall be adjusted as
                          provided in subdivision B above on the basis that the
                          maximum number of Common Shares issuable upon
                          conversion or exchange of all such Convertible
                          Securities shall be deemed to have been issued as of
                          the date of such issue or sale and the aggregate
                          consideration for such maximum number of additional
                          Common Shares shall be deemed to be the minimum
                          consideration received or receivable by the Company
                          (if any) upon the issuance of such additional Common
                          Shares or the issuance or sale of such Convertible
                          Securities and the conversion or exchange thereof.
                          For the purposes of this paragraph (ii), the "lowest
                          price per share for which any one Common Share is
                          issuable" shall be equal to the sum of the lowest
                          amounts of consideration (if any) received or
                          receivable by the Company with respect to any one
                          Common Share upon the issuance or sale of such
                          Convertible Security and upon the conversion or
                          exchange of such Convertible Security.  No further
                          adjustment of the Conversion Price shall be made upon
                          the actual issue of such Common Shares upon
                          conversion or exchange of such Convertible Security,
                          and if any such issue or sale of such Convertible
                          Security is made upon exercise of any Options for
                          which adjustments of the





                                       6
<PAGE>   15
                          Conversion Price had been or are to be made pursuant
                          to other provisions of this subdivision C, no further
                          adjustment of the Conversion Price shall be made by
                          reason of such issue or sale.
        
                                  (iii) If the purchase price provided for in
                          any Option, the additional consideration (if any)
                          payable upon the issue, conversion or exchange of any
                          Convertible Security, or the rate at which any
                          Convertible Security is convertible into or
                          exchangeable for Common Shares changes at any time,
                          the Conversion Price in effect at the time of such
                          change shall be readjusted to the Conversion Price
                          that would have been in effect at such time had such
                          Option or Convertible Security originally provided
                          for such changed purchase price, changed additional
                          consideration or changed conversion rate, as the case
                          may be, at the time initially granted, issued or
                          sold; provided, however, that if such adjustment of
                          the Conversion Price shall result in an increase in
                          the Conversion Price then in effect, such adjustment
                          shall not be effective until thirty (30) days after
                          notice thereof has been given to all holders of the
                          Series A Shares at their respective addresses as the
                          same shall appear on the stock ledger of the Company.

                                  (iv) Upon the expiration of any Option or the
                          termination of any right to convert or exchange any
                          Convertible Security without the exercise of any such
                          Option or right, the Conversion Price then in effect
                          shall be adjusted to the Conversion Price that would
                          have been in effect at the time of such expiration or
                          termination had such Option or Convertible Security,
                          to the extent outstanding immediately prior to such
                          expiration or termination, never been issued;
                          provided, however, that if the Company shall
                          accelerate the expiration of any Option or the
                          termination of any right to convert or exchange any
                          Convertible Security, such adjustment shall not be
                          effective until thirty (30)





                                       7
<PAGE>   16
                          days after notice of such acceleration has been given
                          to all holders of the Series A Shares.
        
                                  (v) If any Common Share, Option or
                          Convertible Security is issued or sold or deemed to
                          have been issued or sold for cash, the consideration
                          received therefor shall be deemed to be the amount
                          received by the Company therefor, without deduction
                          therefrom of any expenses incurred or any
                          underwriting commissions or concessions paid or
                          allowed by the Company in connection therewith.
                          Except as provided below in this subdivision (v), in
                          case any Common Share, Option or Convertible Security
                          is issued or sold or deemed to have been issued or
                          sold for a consideration other than cash, the amount
                          of the consideration other than cash received by the
                          Company shall be the fair value of such
                          consideration, determined in good faith by the Board
                          of Directors of the Company, except where such
                          consideration consists of securities, in which case
                          the amount of consideration received by the Company
                          shall be the Market Price thereof as of the date of
                          receipt, but in each such case without deduction of
                          any expenses incurred or any underwriting commission
                          or concessions paid or allowed by the Company in
                          connection therewith.  In computing the Market Price
                          of a note or other obligation that is not listed on
                          any securities exchange or quoted in the NASDAQ
                          System or for which market quotations are not
                          otherwise readily available, the total consideration
                          to be received by the Company thereunder (including
                          interest) shall be discounted to present value at the
                          prime rate of interest of InterFirst Bank Dallas,
                          N.A., (or its successor in interest) in effect at the
                          time the note or obligation is deemed to have been
                          issued.  If any Common Share, Option or Convertible
                          Security is issued in connection with any merger in
                          which the Company is the surviving corporation, the
                          amount of consideration therefor will be deemed to be
                          the fair value, as determined in good





                                       8
<PAGE>   17
                          faith by the Board of Directors, of such portion of
                          the net assets and business of the nonsurviving
                          corporation as is attributable to such Common Share,
                          Option or Convertible Security, as the case may be. 
                          If any Common Share, Option or Convertible Security
                          is issued in payment or satisfaction of any dividend
                          upon any class of stock other than Common Shares, the
                          amount of consideration therefor will be deemed to be
                          equal to the amount of such dividend so paid or
                          satisfied.
        
                                  (vi) In case any Option is issued in
                          connection with the issue or sale of other securities
                          of the Company, together comprising one integrated
                          transaction in which no specific consideration is
                          allocated to such Option by the parties thereto, the
                          Option shall be deemed to have been granted for
                          consideration of $0.01.

                                  (vii) If the purchase price provided for in
                          any option, warrant or right referred to in clause
                          (i) or (ii) of the parenthetical in subdivision B
                          above shall change at any time (other than by reason
                          of the provisions designed to protect against
                          dilution), then such change shall be deemed the
                          issuance of a new Option as of the date of such
                          change for the purposes of said subdivision B.

                 (d) If the Company shall distribute (pursuant to a dividend or
         otherwise) to all holders of the Common Shares shares of its capital
         stock (other than Common Shares), evidences of indebtedness, assets or
         other property (excluding dividends payable in cash out of surplus
         (determined in accordance with generally accepted accounting
         principles, consistently applied)), or options, warrants or rights to
         subscribe for or to purchase securities of the Company or other
         property, then, in each such case, appropriate provision shall be made
         (without any adjustment of the Conversion Price) to ensure that the
         holder of each Series A Share then outstanding shall have the right to
         receive, upon conversion of such Series A Share, with respect to the
         Common Shares such holder shall receive upon conversion and in
         addition thereto and without payment of any consideration therefor,
         such capital stock, evidences of indebtedness, assets or other
         property, or such options,





                                       9
<PAGE>   18
         warrants or rights, that such holder would have received upon such
         distribution had such holder been the holder of record of the number
         of Common Shares into which such Series A Share could have been
         converted immediately prior to such distribution on the date on which
         the record was taken for such distribution, or, if no record was
         taken, the date as of which the record holders of Common Shares
         entitled to such distribution were determined.

                 (e) In case of (i) any reclassification or change of the
         outstanding Common Shares (other than a change in par value, or from
         par value to no par value, or from no par value to par value, or a
         change in the Common Shares as a result of a subdivision or
         combination for which an adjustment of the Conversion Price is made
         pursuant to subdivision A of Section 2(c), or (ii) any consolidation
         or merger of the Company or any Subsidiary with or into another
         entity, or (iii) any sale or conveyance to another corporation of the
         assets of the Company as an entirety or substantially as an entirety,
         as a result of which in any such case the holders of all the Common
         Shares are entitled to receive (either directly or upon subsequent
         liquidation pursuant to a plan of liquidation adopted in connection
         with such transaction) stock or other securities or property with
         respect to or in exchange for the Common Shares, then, in each such
         case, without any adjustment of the Conversion Price, effective as of
         the effective time of any such reclassification, change,
         consolidation, merger, sale or conveyance, as the case may be, the
         holder of each Series A Share then outstanding shall have the right to
         receive or acquire, upon conversion of such Series A Share, in lieu of
         or in addition to the Common Shares theretofore receivable upon such
         conversion, the kind and amount of shares of stock and other
         securities and property receivable upon such reclassification, change,
         consolidation, merger, sale or conveyance by a holder of the number of
         Common Shares into which such Series A Share could have been converted
         immediately prior to such reclassification, change, consolidation,
         merger, sale or conveyance.  The Company shall not effect any such
         consolidation, merger, sale or conveyance unless prior to or
         simultaneously with the consummation thereof the successor corporation
         (if other than the Company) resulting from such consolidation or
         merger or the entity purchasing such assets assumes by written
         instrument (in form reasonably satisfactory to the holders of a
         majority of the Series A Shares then outstanding) the obligation to
         deliver to each such holder such shares of stock or other securities
         or property as, in accordance with the foregoing provisions of this
         subsection (e), such holder may be entitled to





                                       10
<PAGE>   19
         receive or acquire.  In each such case, appropriate adjustments shall
         be made in the application of the provisions of this Section 2 with
         respect to the rights and interests thereafter of the holders of the
         Series A Shares, to the end that the provisions of this Section 2
         shall thereafter be applicable, as nearly as reasonably may be, to the
         stock or other securities or property thereafter deliverable in lieu
         of Common Shares upon the conversion of Series A Shares.  The
         provisions of this subsection (e) shall similarly apply to successive
         reclassifications, changes, consolidations, mergers, sales and
         conveyances.  If the occurrence of any one event shall give rise to an
         adjustment under both this subsection (e) and Section 2(d) hereof,
         then the terms of this subsection (e) shall control.

                 (f) If on or after December 24, 1986, the Company shall take
         any action affecting the Common Shares, other than an action described
         in subsections (c), (d) or (e) above, which, in the opinion of the
         Board of Directors of the Company, would have a material adverse
         effect upon the conversion option granted by this Section 2, the
         Conversion Price shall be adjusted in such manner and at such time as
         the Board may in good faith determine to be equitable in the
         circumstances.

                 (g) Except as otherwise provided in this Section 2, if an
         adjustment to the Conversion Price is required under more than one
         subsection or subdivision of this Section 2, then the Conversion Price
         shall be adjusted in the manner provided herein which will result in
         the greater reduction in the Conversion Price.

                 (h) Any determination as to fair value or as to whether any
         adjustment (including an adjustment of the Conversion Price) is
         required hereunder, or as to the amount of any such adjustment, if
         required, shall be binding upon the holders of the Series A Shares and
         the Company if made in good faith by the Board of Directors of the
         Company.

                 (i) Whenever the Conversion Price is adjusted as provided in
         this Section 2, then, in each such case, the Company shall notify the
         transfer agent, if any, for the Series A Shares and shall promptly
         give to the holders of the Series A Shares who are holders of record
         not more than fifteen (15) days before the date such notice is given,
         a notice stating (i) the event requiring the adjustment, (ii) the
         method by which the adjustment was calculated (including a description
         of the basis on which the Board of Directors of the Company made any
         determination hereunder), and (iii) the adjusted





                                       11
<PAGE>   20
         Conversion Price then and thereafter effective under this Section 2.
         An affidavit of the transfer agent for the Series A Shares or of the
         Secretary of the Company that any such notice has been given shall, in
         the absence of fraud, be prima facie evidence of the facts stated
         therein.

                 (j)  In case at any time:

                          (i) the Board of Directors of the Company shall
                 declare a dividend (or any other distribution) on the Common
                 Shares; or

                          (ii) the Board of Directors of the Company shall
                 authorize the granting to all holders of the Common Shares of
                 options, warrants or rights to subscribe for or to purchase
                 any shares of stock of any class or of any other options,
                 warrants or rights; or

                          (iii) the Board of Directors of the Company shall
                 authorize any reclassification of the Common Shares, any
                 consolidation or merger of the Company or any Subsidiary with
                 or into another corporation, or the sale or conveyance of all
                 or a substantial portion of the assets of the Company; or

                          (iv) the Board of Directors of the Company shall
                 authorize the voluntary liquidation, dissolution or winding up
                 of the Company;

         then the Company shall cause to be given to each holder of Series A
         Shares, as promptly as possible but in any event at least twenty (20)
         days (sixty (60) days in the case of any merger or consolidation to
         which the Company or any Subsidiary is a party or the sale or
         conveyance of all or a substantial portion of the Company's assets)
         prior to the applicable date hereinafter specified, a notice stating
         (1) the date on which a record is to be taken for the purposes of such
         dividend, distribution or granting of options, warrants or rights, or,
         if a record is not to be taken, the date as of which the holders of
         Common Shares of record to be entitled to such dividend, distribution
         or options, warrants or rights are to be determined, or (2) the date
         on which such reclassification, consolidation, merger, sale,
         conveyance, liquidation, dissolution or winding up is expected to
         become effective, the terms of such transaction, and the date as of
         which it is expected that holders of Common Shares of record shall be
         entitled to exchange their





                                       12
<PAGE>   21
         Common Shares for securities or other property deliverable upon such
         reclassification, consolidation, merger, sale, conveyance,
         liquidation, dissolution or winding up.  Failure to give any such
         notice or any defect therein shall not affect the validity of the
         proceedings referred to in clauses (i), (ii), (iii) and (iv) above.
         Nothing contained in this subsection (j) shall be deemed to adversely
         affect the rights of the holders of the Series A Shares, under the
         Delaware General Corporation Law or under the Certificate of
         Incorporation of the Company, to be given notice of, or to vote upon,
         a proposal to effect any transaction described in this subsection (j).

                 (k) No fractional Common Shares shall be issued upon the
         conversion of Series A Shares.  If more than one Series A Share shall
         be surrendered for conversion at one time by the same holder, the
         number of full Common Shares issuable upon conversion thereof shall be
         computed on the basis of the aggregate number of Series A Shares so
         surrendered.  If any fractional interest in a Common Share would,
         except for the provisions of this subsection (k), be deliverable upon
         the conversion of any Series A Share or Shares, the Company shall, in
         lieu of delivering the fractional share therefor, pay to the holder of
         such surrendered Series A Share or Shares an amount in cash (computed
         to the nearest cent) equal to such fractional interest multiplied by
         the Market Price of a Common Share as of the close of business on the
         date of conversion.

                 (l) The Company shall as promptly as practicable seek the
         approval of its shareholders to cause its Certificate of Incorporation
         to be amended to increase the number of authorized Common Shares to a
         number sufficient to permit the conversion of all outstanding Series A
         Shares from time to time as necessary under the circumstances.  Upon
         any issuance of Series A Shares, the Company shall reserve a number of
         Common Shares sufficient to permit conversion of all of such Series A
         Shares at such time; provided, however, that if and to the extent the
         number of authorized Common Shares is not then sufficient to permit
         conversion of all then issued Series A Shares, all then authorized but
         unissued Common Shares which are not otherwise reserved shall be
         reserved for purposes of permitting conversion of a portion of such
         Series A Shares and after approval by the Company's shareholders of an
         amendment to the Company's Certificate of Incorporation increasing the
         number of authorized Common Shares, the Company shall reserve such
         number of newly authorized Common Shares so as to permit, immediately
         following such approval, the conversion of all such Series A Shares,
         and thereafter the Company





                                       13
<PAGE>   22
         shall at all times have reserved and available out of its authorized
         but unissued Common Shares solely for the purpose of issue upon
         conversion of the Series A Shares, as provided in this Section 2, such
         number of Common Shares as shall from time to time be sufficient to
         permit the conversion of all outstanding Series A Shares.  Upon the
         issuance thereof upon conversion, all in accordance with the
         provisions of this Section 2, such Common Shares shall be validly
         issued, fully paid and nonassessable.  Series A Shares converted
         pursuant to this Section 2 shall be cancelled and shall not be
         reissued.  Upon any conversion, no adjustment shall be made for
         dividends on the Common Shares payable to holders of record of Common
         Shares on a date prior to the date of such conversion.

                 (m) The issuance of certificates for Common Shares shall be
         made without charge for any tax in respect of such issuance.  However,
         if any such certificate is to be issued in the name other than that of
         the holder of the converted Series A Shares, the Company shall not be
         required to issue or deliver any certificate or certificates unless
         (i) the holder has paid to the Company the amount of any tax that may
         be payable in respect of any transfer involved in such issuance or
         shall establish to the satisfaction of the Company that such tax has
         been paid and (ii) the certificate for the Series A Shares surrendered
         for conversion shall be duly endorsed or accompanied by a duly
         executed stock power.

                 (n) If the issuance of any Common Shares upon the conversion
         of Series A Shares requires approval of or by any securities exchange
         before such shares may be issued, and the Company determines to secure
         such approval, then the Company may suspend the conversion of all
         Series A Shares for the period during which it is endeavoring to
         secure such approval.

                 3.  Voting Rights.  The holders of the Series A Shares shall
         not have, and shall not be entitled to exercise, exercise, any voting
         rights with respect to the Series A Shares, except for such voting
         rights which such holders may be entitled to exercise as holders of a
         class or series of capital stock of the Company pursuant to, under or
         in accordance with specific provisions of the Delaware General
         Corporation Law.

                 4.       Dividends.

                 (a) The holders of the Series A Shares shall be entitled to
         receive out of funds legally available therefor, cumulative cash
         dividends at the rate of 6% per annum of the Liquidation Value per
         Series A Share





                                       14
<PAGE>   23
         ($1.1364, as adjusted for any stock split, reverse stock split, stock
         dividend or similar event resulting in a change in the Series A
         Shares) (the "Dividend Rate"), payable on June 30 of each year in
         which any Series A Shares shall be outstanding, commencing June 30,
         1987, to the holders of record of such Series A Shares on the
         respective dates fixed for such purpose by the Board of Directors of
         the Company in advance of payment of each dividend.  Dividends on each
         Series A Share shall be cumulative from the date of issue thereof.
         The first dividend payable with respect to any Series A Share shall be
         computed by multiplying the Dividend Rate by a fraction of which (i)
         the numerator shall be the number of days from the date of issue of
         such Series A Share through the date as of which such first dividend
         is payable, inclusive, and (ii) the denominator shall be 360.

                 (b) All other equity securities of the Company, including,
         without limitation, the Senior Shares, if any, and the Junior Shares,
         if any, shall rank junior to the Series A Shares in the payment of
         dividends.

                 (c) To the extent any dividend accrues on a Series A Share,
         and is not fully paid in the manner specified in Section 4(a) hereof,
         such dividend (or, if paid in part, the unpaid portion thereof) shall
         be added to the Liquidation Value of such Series A Share and shall
         remain a part of such Liquidation Value until such dividend (or unpaid
         portion thereof) is paid. In addition, any such unpaid dividend shall
         not result in an adjustment to the Conversion Price, and any such
         unpaid dividend shall no longer be payable to a holder of such Series
         A Share upon the effective date of the conversion thereof into Common
         Shares.

                 (d) If at any time the Company pays less than the total amount
         of dividends then accrued and payable with respect to the Series A
         Shares, such payment shall be distributed ratably among the holders of
         the Series A Shares based upon the aggregate Liquidation Value of the
         Series A Shares then held by each such holder.

                 (e) So long as any Series A Shares shall remain outstanding,
         no dividend whatsoever (other than a dividend payable in Common
         Shares) shall be declared or paid on any Junior Shares, nor shall any
         Junior Shares be redeemed or purchased by the Company or any
         Subsidiary thereof, nor shall any monies be paid to or made available
         for a sinking fund for the redemption or purchase of any Junior
         Shares, unless in each such instance full dividends on all outstanding
         Series A





                                       15
<PAGE>   24
         Shares for all past dividend periods and the dividend on all
         outstanding Series A Shares for the then current dividend period shall
         have been paid and sufficient funds set apart therefor.

         5.      Definitions.

                 (a) As used herein, the following terms shall have the
         meanings specified in the sections listed below:

<TABLE>
<CAPTION>
        Term                                               Section
        ----                                               -------
        <S>                                                <C>
        Company                                            Preamble

        Conversion Price                                   2(c)

        Convertible Securities                             2(c)C(i)

        Liquidation Value                                  1

        Options                                            2(c)C(i)

        Series A Shares                                    Preamble
</TABLE>

                 (b) As used herein, the following terms shall have the
         following meanings:

                 "Common Shares" shall mean and include the shares of Common
         Stock, par value $0.10 per share, of the Company as constituted on the
         date of the original issue of the Series A Shares and shall also
         include any class of shares of capital stock of the Company thereafter
         authorized that shall not be limited to a fixed sum or percentage in
         respect of the right of the holders thereof to receive dividends or to
         participate in the assets of the Company distributable to shareholders
         upon any liquidation, dissolution or winding up of the Company;
         provided, however, that the shares into which the Series A Shares
         shall be convertible pursuant to Section 2 hereof shall mean and
         include, and, as used in Section 2 hereof, the term "Common Shares"
         shall mean and include, only the Common Stock, par value $0.10 per
         share, of the Company as constituted on the date of the original issue
         of the Series A Shares or (i) in the case of any reclassification,
         change, consolidation, merger, sale or conveyance of the character
         referred to in Section 2(e) hereof, the shares or other securities or
         property deliverable in lieu thereof or (ii) in the case of any change
         or reclassification of the outstanding Common Shares issuable upon
         conversion of the Series A Shares as a result of a subdivision or
         combination or consisting of a change in par value, or from par value
         to no par value,





                                       16
<PAGE>   25
         or from no par value to par value, such Common Shares as so changed or
         reclassified.

                 "Junior Shares" shall mean (i) Common Shares and (ii) all
         those classes and series of preferred or special shares which, by the
         terms of the Certificate of Incorporation of the Company, shall be
         subordinate to the Series A Shares with respect to the right of the
         holders thereof to participate in the assets of the Company
         distributable to shareholders upon any liquidation, dissolution or
         winding up of the Company.

                 "Market Price" of any security shall mean the average of the
         closing prices of such security's sales on all securities exchanges on
         which such security may at the time be listed, or, if there have been
         no sales on any such exchange on any day, the average of the highest
         bid and lowest asked prices on all such exchanges at the end of such
         date, or, if on any day such security is not so listed, the average of
         the representative bid and asked prices quoted in the NASDAQ System as
         of 4:00 p.m., New York time, or, if on any day such security is not
         quoted in the NASDAQ System, the average of the high and low bid and
         asked prices on such day in the domestic over-the-counter market as
         reported by the National Quotation Bureau, Inc., or any similar
         successor organization, in each such case averaged over a period of 21
         days consisting of the day as of which "Market Price" is being
         determined and the 20 consecutive business days prior to such date.
         If at any time such security is not listed on any securities exchange
         or quoted in the NASDAQ System or the over-the-counter market, the
         "Market Price" of such security shall be the fair value thereof
         determined in good faith by the Board of Directors of the Company.

                 "Parity Shares" shall mean all those classes and series of
         preferred or special shares which, by the terms of the Certificate of
         Incorporation of the Company, shall be on a parity with the Series A
         Shares with respect to the right of the holders thereof to participate
         in the assets of the Company distributable to shareholders upon any
         liquidation, dissolution or winding up of the Company.

                 "Senior Shares" shall mean all those classes and series of
         preferred or special shares which, by the terms of the Certificate of
         Incorporation of the Company, shall be senior to the Series A Shares
         with respect to the right of the holders thereof to participate in the
         assets of the Company distributable to shareholders upon any
         liquidation, dissolution or winding up of the Company.





                                       17
<PAGE>   26
                 "Subsidiary" shall mean any entity of which shares of stock or
         other equity interests having at least a majority of the ordinary
         voting power in electing the board of directors or similar governing
         body are, at the time as of which any determination is being made,
         owned by the Company either directly or indirectly through one or more
         Subsidiaries.

         8.      Miscellaneous.

                 (a) If any other class or series of preferred or special
         shares of the Company, whether ranking prior to or on a parity with or
         junior to the Series A Shares as to dividends or assets, shall be
         created, nothing herein shall prevent the holders of any such other
         class or series of preferred or special shares from being given any
         designations, preferences, limitations or relative rights authorized
         by law and the Certificate of Incorporation of the Company, except as
         otherwise expressly provided herein with respect to the foregoing
         matters.

                 (b) All notices or other communications referred to herein,
         except as otherwise expressly provided, shall be hand delivered or
         given by registered or certified mail, return receipt requested,
         postage prepaid, and shall be deemed to have been given when so hand
         delivered or mailed.

         DATED this 8th day of April, 1987.



                                            /s/ Donald L. Evans
                                        -------------------------------
                                        Donald L. Evans, President


   /s/ James M. Alsup        
- - --------------------------------
James M. Alsup, Secretary








                                       18
<PAGE>   27

                             CERTIFICATE OF MERGER
                                    MERGING
                                TOM BROWN, INC.
                              A NEVADA CORPORATION
                                      INTO
                                TOM BROWN, INC.
                             A DELAWARE CORPORATION

             (Pursuant to Section 252 of the General Corporation
                        Law of the State of Delaware)


         Tom Brown, Inc., a corporation organized under the laws of the State
of Delaware, does hereby certify that:

         1.      The names and states of incorporation of each of the
constituent corporations are:

                  Name of Corporation                     State
                  -------------------                     -----

                     Tom Brown, Inc.                      Nevada

                     Tom Brown, Inc.                      Delaware

         2.      A Plan and Agreement of Merger has been approved, adopted,
certified, executed and acknowledged by each of the constituent corporations in
accordance with Section 252(c) of the General Corporation Law of the State of
Delaware.

         3.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         4.      The Certificate of Incorporation of Tom Brown, Inc., a
Delaware corporation, shall be the Certificate of Incorporation of the
surviving corporation.

         5.      The executed Plan and Agreement of Merger is on file at the
principal place of business of the surviving corporation as follows:

                                Tom Brown, Inc.
                                500 Empire Plaza
                              Midland, Texas 79701

         6.      A copy of the Plan and Agreement of Merger will be furnished
by the surviving corporation on request and without cost, to any stockholder of
any constituent corporation.

         7.      The authorized capital stock of Tom Brown Inc., Nevada, is
150,000,000 shares, of which 100,000,000 shares are common stock and 50,000,000
shares are preferred stock.

<PAGE>   28
         IN WITNESS WHEREOF, said Tom Brown, Inc., a Delaware corporation, has
caused this certificate to be signed by Donald L. Evans, its President, and
attested by James M. Alsup, its Secretary, this 9th day of April, 1987.



                                        By:  /s/ Donald L. Evans
                                           -----------------------------------
                                             Donald L. Evans, President





ATTEST:

   /s/ James M. Alsup         
- - ------------------------------     
James M. Alsup, Secretary




THE STATE OF TEXAS        )       
                          )       
COUNTY OF MIDLAND         )       

         This instrument was acknowledged before me on April 9, 1987, by Donald
L. Evans, President of Tom Brown, Inc., a Delaware corporation, on behalf of
said Corporation.


                                        /s/ Rita K. Turner
                                        ------------------------------------
                                        Name  Rita K. Turner
                                            --------------------------------
                                             Notary Public in and for
                                             the State of Texas

My Commission Expires:
      10/23/89                          
- - ------------------------



<PAGE>   29

                      CERTIFICATE OF OWNERSHIP AND MERGER
                                    MERGING
                              TBI MANAGEMENT, INC.
                                      INTO
                                TOM BROWN, INC.,
                             A DELAWARE CORPORATION

                        (Pursuant to Sections 253 of the
               General Corporation Law of the State of Delaware)

         TOM BROWN, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, does hereby
certify that:

         1.      Tom Brown, Inc. is the parent corporation of TBI Management,
Inc., a Texas corporation, and Tom Brown, Inc. owns 100% of the outstanding
shares of stock of TBI Management, Inc., and therefore is entitled to Merge TBI
Management, Inc. into Tom Brown, Inc. under the provisions of Section 253 of
the General Corporation Law of the State of Delaware.

         2.      The provision for making this Certificate of Ownership and
Merger is contained in the Tom Brown, Inc.  Unanimous Consent of Directors,
attached hereto as Exhibit "A".

         3.      The names and state of incorporation of each of the
constituent corporations are:

                 Name of Corporation                                State
                 -------------------                                -----

                 TBI Management, Inc.                               Texas

                 Tom Brown, Inc.                                    Delaware

         4.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         5.      The principal place of business of the surviving corporation
is:

                 Tom Brown, Inc.
                 500 Empire Plaza
                 Midland, Texas  79701
                 Attn:  Mr. Donald L. Evans

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Ownership and Merger to be signed on its behalf by its President and attested
by its Secretary this 25th day of April, 1988.


Attest:                                            TOM BROWN, INC.

/s/ James M. Alsup                       By:  /s/ Donald L. Evans
- - -------------------------                   ------------------------------
James M. Alsup, Secretary                Donald L. Evans, President
<PAGE>   30

                                   EXHIBIT A


                       SPECIAL MEETING UNANIMOUS CONSENT
                      OF THE DIRECTORS OF TOM BROWN, INC.
                       PURSUANT TO SECTION 141(f) OF THE
                           GENERAL CORPORATION LAW OF
                             THE STATE OF DELAWARE


         The undersigned, being all of the Directors of TOM BROWN, INC. (the
"Corporation"), and being entitled to vote upon the resolutions hereinafter set
forth, do hereby consent that the resolutions set forth below are deemed to be
adopted to the same extent and to have the same force and effect as if adopted
by unanimous consent in a formal meeting of the Board of Directors of the
Corporation duly called and held for the purpose of acting upon a proposal to
adopt such resolutions:

         "RESOLVED, That the Corporation shall merge with its 100% owned
         subsidiary corporation, TBI Management, Inc., a Texas corporation,
         pursuant to the provisions of Section 253 of the General Corporation
         Law of the State of Delaware and Articles 5.07B(2) and (3) and 5.16 of
         the Business Corporation Act of the State of Texas.

         "RESOLVED, That the officers of the Corporation shall be fully
         authorized to take any actions necessary to accomplish the merger
         between the Corporation and TBI Management, Inc.

         "RESOLVED, That the Corporation shall be the surviving corporation in
         such merger, and that TBI Management, Inc. shall cease to exist.

         "RESOLVED, That such merger shall be effective as of April 25, 1988."

         ADOPTED April 25, 1988.


                                          /s/ Thomas C. Brown
                                        -----------------------------------
                                        Thomas C. Brown, Director


                                          /s/ Donald L. Evans
                                        -----------------------------------
                                        Donald L. Evans, Director


                                          /s/ Edward W. LeBaron, Jr.
                                        -----------------------------------
                                        Edward W. LeBaron, Jr., Director


                                          /s/ Joe G. Roper
                                        -----------------------------------
                                        Joe G. Roper, Director

<PAGE>   31

                      CERTIFICATE OF OWNERSHIP AND MERGER
                                    MERGING
                            GENERAL RESOURCES, INC.
                                      INTO
                                TOM BROWN, INC.,
                             A DELAWARE CORPORATION

                        (Pursuant to Sections 253 of the
               General Corporation Law of the State of Delaware)

         TOM BROWN, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, does hereby
certify that:

         1.      Tom Brown, Inc. is the parent corporation of General
Resources, Inc., a Texas corporation, and Tom Brown, Inc. owns 100% of the
outstanding shares of stock of General Resources, Inc., and therefore is
entitled to merge General Resources, Inc. into Tom Brown, Inc. under the
provisions of Section 253 of the General Corporation Law of the State of
Delaware.

         2.      The provision for making this Certificate of Ownership and
Merger is contained in the Tom Brown, Inc.  Unanimous Consent of Directors,
attached hereto as Exhibit A.

         3.      The names and state of incorporation of each of the
constituent corporations are:

                 Name of Corporation                                State
                 -------------------                                -----

                 General Resources, Inc.                            Texas

                 Tom Brown, Inc.                                    Delaware

         4.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         5.      The principal place of business of the surviving corporation
is:

                 Tom Brown, Inc.
                 500 Empire Plaza
                 Midland, Texas  79701
                 Attn:  Mr. Donald L. Evans

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Ownership and Merger to be signed on its behalf by its President and attested
by its Secretary this 25th day of April, 1988.

Attest:                                            TOM BROWN, INC.


/s/ James M. Alsup                       By:  /s/ Donald L. Evans
- - -------------------------                   ----------------------------
James M. Alsup, Secretary                   Donald L. Evans, President
<PAGE>   32
                                   EXHIBIT A

                       SPECIAL MEETING UNANIMOUS CONSENT
                      OF THE DIRECTORS OF TOM BROWN, INC.
                       PURSUANT TO SECTION 141(f) OF THE
                           GENERAL CORPORATION LAW OF
                             THE STATE OF DELAWARE


         The undersigned, being all of the Directors of TOM BROWN, INC.  (the
"Corporation"), and being entitled to vote upon the resolutions hereinafter set
forth, do hereby consent that the resolutions set forth below are deemed to be
adopted to the same extent and to have the same force and effect as if adopted
by unanimous consent in a formal meeting of the Board of Directors of the
Corporation duly called and held for the purpose of acting upon a proposal to
adopt such resolutions:

         "RESOLVED,  That the Corporation shall merge with its 100% owned
         subsidiary corporation, General Resources, Inc., a Texas corporation,
         pursuant to the provisions of Section 253 of the General Corporation
         Law of the State of Delaware and Articles 5.07B(2) and (3) and 5.16 of
         the Business Corporation Act of the State of Texas.

         "RESOLVED, That the officers of the Corporation shall be fully
         authorized to take any actions necessary to accomplish the merger
         between the Corporation and General Resources, Inc.

         "RESOLVED, That the Corporation shall be the surviving corporation in
         such merger, and that General Resources, Inc. shall cease to exist.

         "RESOLVED, That such merger shall be effective as of April 25, 1988."

         ADOPTED April 25, 1988.


                                          /s/ Thomas C. Brown
                                        ------------------------------------
                                        Thomas C. Brown, Director


                                          /s/ Donald L. Evans
                                        ------------------------------------
                                        Donald L. Evans, Director


                                          /s/ Edward W. LeBaron, Jr.
                                        ------------------------------------
                                        Edward W. LeBaron, Jr., Director


                                          /s/ Joe G. Roper
                                        ------------------------------------
                                        Joe G. Roper, Director

<PAGE>   33

                        CERTIFICATE OF AMENDMENT TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.

         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation") does
hereby certify as follows:

         FIRST:  Pursuant to the provisions of the Delaware General Corporation
Law, the Board of Directors and the stockholders of the Corporation adopted an
amendment to the Certificate of Incorporation of the Corporation, which is set
forth in the following resolution in accordance with Section 242 of the
Delaware General Corporation Law, the purpose of which amendment is to effect a
one-for-twenty reverse stock split:

         "RESOLVED, That the Certificate of Incorporation of the Corporation be
         amended by changing Paragraph Fourth thereof, so that as amended, said
         Paragraph Fourth shall read as follows:

                 FOURTH:  The total number of shares of all classes that the
                 Corporation shall have authority to issue is 12,500,000, of
                 which 2,500,000 shares shall be Preferred Stock, par value
                 $.10 per share, and 10,000,000 shares shall be Common Stock,
                 $.10 par value per share.  All of such shares shall, upon
                 issuance thereof, be fully paid and non-assessable.

                 The designations, preferences, limitations and relative rights
                 of the shares of each class that the Corporation shall have
                 authority to issue are as follows:

                 A.       Preferred Stock.  The Board of Directors is hereby
                          expressly vested with the authority to adopt a
                          resolution or resolutions providing for the issue of
                          authorized but unissued shares of Preferred Stock,
                          which shares may be issued from time to time in one
                          or more series and in such amounts as may be
                          determined by the Board of Directors in such
                          resolution or resolutions.  The designations,
                          preferences, limitations or relative rights of the
                          Preferred Stock and the qualifications, limitations
                          or restrictions, if any, of such preferences and/or
                          rights (collectively, the "Series Terms") may vary
                          between series in any and all respects and shall be
                          such as are
<PAGE>   34
                          stated and expressed in a resolution or resolutions
                          providing for the creation or revision of such Series
                          Terms set forth in a Certificate of Designations (a
                          "Preferred Stock Series Resolution") adopted by the
                          Board of Directors; provided that all shares of any
                          one series of Preferred Stock so designated by the
                          Board of Directors shall be identical in all respects
                          except that shares of any one series issued at
                          different times may differ as to the dates from which
                          dividends thereon may be cumulative.  The powers of
                          the Board of Directors with respect to the Series
                          Terms of a particular series shall include, but not
                          be limited to, determination of the following:
        
                          1.  The right to receive dividends, if any, and
                              the rate, dates, terms and other conditions
                              on which such dividends shall be payable;
                              
                          2.  The nature of the dividend payable, if any,
                              with respect to shares of such series as
                              cumulative, non-cumulative or partially
                              cumulative;
                              
                          3.  The redemption rights of such series
                              including the price at and the terms and
                              conditions on which such shares may be
                              redeemed;
                              
                          4.  The amount payable upon shares in the event
                              of involuntary liquidation;
                              
                          5.  The amount payable upon shares in the event
                              of voluntary liquidation;
                              
                          6.  Sinking fund provisions for the redemption or
                              purchase of shares;
                              
                          7.  The terms and conditions on which shares may
                              be converted, if the shares of any series are
                              issued with the privilege of conversion;
                              
                          8.  Voting rights, if any; and





                                       2
<PAGE>   35
                          9.  Repurchase obligations of the Corporation
                              with respect to the shares of each series.

                          Any of the Series Terms, including voting rights, of
                          any series may be made dependent upon facts
                          ascertainable outside this Certificate of
                          Incorporation and the Preferred Stock Series
                          Resolution, provided that the manner in which such
                          facts shall operate upon such Series Terms is clearly
                          and expressly set forth herein or in the Preferred
                          Stock Series Resolution.

                          Subject to the provisions of this Paragraph Fourth,
                          shares of one or more series of Preferred Stock may
                          be authorized or issued from time to time as shall be
                          determined by and for such consideration as shall be
                          fixed by the Board of Directors, in an aggregate
                          amount not exceeding the total number of shares of
                          Preferred Stock authorized herein.  Except in respect
                          of Series Terms fixed by the Board of Directors as
                          permitted hereby, all shares of Preferred Stock shall
                          be of equal rank and shall be identical.

                 B.  Common Stock.

                          1.  Dividends.  Subject to the provisions of any
                              Preferred Stock Series Resolution, the Board
                              of Directors may, in its discretion, out of
                              funds legally available for the payment of
                              dividends and at such times and in such
                              manner as determined by the Board of
                              Directors, declare and pay dividends on the
                              Common Stock of the Corporation.
                              
                              No dividend (other than a dividend in capital
                              stock ranking on a parity with the Common
                              Stock or cash in lieu of fractional shares
                              with respect to such stock dividend) shall be
                              declared or paid on any share or shares of
                              any class of stock or series thereof ranking
                              on a
                              




                                       3
<PAGE>   36
                              parity with the Common Stock in respect of
                              payment of dividends for any dividend period
                              unless there shall have been declared, for the
                              same dividend period, like proportionate
                              dividends on all shares of Common Stock then
                              outstanding.
        
                          2.  Liquidation.  In the event of any
                              liquidation, dissolution or winding up of the
                              Corporation, whether voluntary or
                              involuntary, after payment or provision for
                              payment of the debts and other liabilities of
                              the Corporation and after payment of any
                              preferential amount due to the holders of any
                              other class or series of stock, the holders
                              of the Common Stock shall be entitled to
                              receive ratably any or all assets remaining
                              to be paid or distributed.
                              
                          3.  Voting Rights.  Subject to any special voting
                              rights set forth in any Preferred Stock
                              Series Resolution, the holders of the Common
                              Stock of the Corporation shall be entitled at
                              all meetings of shareholders to one vote for
                              each share of such stock held by them.

                 C.       Prior, Parity or Junior Stock.  Whenever reference is
                          made in this Paragraph Fourth or in any Preferred
                          Stock Series Resolution to shares "ranking prior to"
                          another class or series of stock or "on a parity
                          with" another class or series of stock, such
                          reference shall mean and include all other shares of
                          the Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends or as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are given preference
                          over, or rank on an equality with, as the case may
                          be, the rights of the holders of such other class or
                          series of stock.  Whenever reference is made to
                          shares "ranking junior to" another class of stock,
                          such





                                       4
<PAGE>   37
                          reference shall mean and include all shares of the
                          Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends and as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are junior and
                          subordinate to the rights of the holders of such
                          class or series of stock.
        
                          Except as otherwise provided herein or in any
                          Preferred Stock Series Resolution, each series of
                          Preferred Stock ranks on a parity with each other
                          series and each series ranks prior to the Common
                          Stock.  Common Stock ranks junior to the Preferred
                          Stock.

                 D.       Liquidation.  For the purposes of Section (2) of
                          Section B of this Paragraph Fourth and for the
                          purpose of the comparable sections of any Preferred
                          Stock Series Resolution, the merger or consolidation
                          of the Corporation into or with any other
                          corporation, or the merger of any other corporation
                          into it, or the sale, lease or conveyance of all or
                          substantially all the assets, property or business of
                          the Corporation, shall not be deemed to be a
                          liquidation, dissolution or winding up of the
                          Corporation.

                 E.       Reservation and Retirement of Shares.  The
                          Corporation shall 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 any series of
                          Preferred Stock having conversion privileges from
                          time to time outstanding are convertible.

                          Unless otherwise provided in a Preferred Stock Series
                          Resolution with respect to a particular series of
                          Preferred Stock, all shares of Preferred Stock
                          redeemed or acquired (as a result of conversion or
                          otherwise) shall be retired and restored to the
                          status of authorized but unissued shares.





                                       5
<PAGE>   38
                 F.       Preemptive Rights.

                          1.  No holder of shares of Preferred Stock or
                              Common Stock of the Corporation shall have
                              any preemptive right to purchase or subscribe
                              for or receive any shares of any class, or
                              series thereof, of stock of the Corporation,
                              whether now or hereafter authorized, or any
                              warrants, options, bonds, debentures or other
                              securities convertible into, exchangeable for
                              or carrying any right to purchase any shares
                              of any class, or series thereof, of stock;
                              but such additional shares of stock and such
                              warrants, options, bonds, debentures or other
                              securities convertible into, exchangeable for
                              or carrying any right to purchase any shares
                              of any class, or series thereof, of stock may
                              be issued or disposed of by the Board of
                              Directors to such persons, and on such terms
                              and for such lawful consideration, as in its
                              discretion it shall deem advisable.
                              
                          2.  The stockholders of the Corporation shall
                              have no rights to acquire the shares of
                              Common Stock of the Corporation now held in
                              the treasury of the Corporation or any shares
                              of Common Stock of the Corporation hereafter
                              acquired by the Corporation and held as
                              treasury shares.

                 G.       No Cumulative Voting.  Cumulative voting shall not be
                          allowed in the election of Directors or for any other
                          purpose.

                 H.       Repurchases of Capital Stock.  The Corporation may,
                          without shareholder approval, purchase, directly or
                          indirectly, its own shares to the extent permitted by
                          the Delaware General Corporation Law."

         SECOND:  Pursuant to the provisions of the Delaware General
Corporation Law, the Board of Directors and the stockholders of the Corporation
adopted an amendment to the Certificate of





                                       6
<PAGE>   39
Designations, Preferences and Rights of Serial Preferred Stock Series A
Non-Voting Convertible 6% Cumulative Preferred Stock filed April 9, 1987 with
the Delaware Secretary of State and authorizing the creation and issuance of an
aggregate of 22,000,000 shares of Series A Non-Voting Convertible 6% Cumulative
Preferred Stock, which is set forth in the following resolution in accordance
with Section 242 of the Delaware General Corporation Law, the purpose of which
amendment is to effect a one-for-twenty reverse stock split:

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible.6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be amended by changing the first paragraph of the
         resolution creating the series of serial preferred stock designated as
         the Series A Non-Voting Convertible 6% Cumulative Preferred Stock, so
         that as amended, said paragraph shall read as follows:

                          "RESOLVED, That the Board of Directors of Tom Brown,
                          Inc.  (the "Company"), in the exercise of its best
                          business judgment and intending to act in full
                          compliance with the applicable provisions of the
                          Company's Certificate of Incorporation and Bylaws and
                          the provisions of the Delaware General Corporation
                          Law, hereby establishes a series of Preferred Stock,
                          par value $0.10 per share, of the Company designated
                          as "Series A Non-Voting Convertible 6% Cumulative
                          Preferred Stock" (the "Series A Shares"), and the
                          number of Series A Shares which the Company is
                          authorized to issue from time to time shall be
                          1,100,000 and the designations, preferences,
                          limitations, and relative rights, and qualifications,
                          limitations and restrictions, of the Series A Shares
                          shall be as follows:"

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the numbered
         paragraph 1 thereof, so that as amended, said paragraph 1 shall read
         as follows:

                 1.  Liquidation.  The Series A Shares shall be preferred as to
                     assets over Junior Shares so that, in the event of the
                     voluntary or involuntary liquidation, dissolution or





                                       7
<PAGE>   40
                     winding up of the Company, the holders of the Series A
                     Shares shall be entitled, in conjunction with any
                     provision then being made for the holders of Parity
                     Shares, if any, to have set apart for them or to be paid
                     out of the assets of the Company, after payment or
                     provision for payment of the debts and other liabilities
                     of the Company and after provision for the holders of
                     Senior Shares, if any, but before any distribution is made
                     to or set apart for the holders of Junior Shares, an
                     amount in cash equal to $22.7280 per Series A Share (as
                     adjusted for any stock split, reverse stock split, stock
                     dividend or similar event resulting in a change in the
                     Series A Shares) (the "Liquidation Value"), together with
                     all dividends accrued on such Series A Shares to the date
                     of payment, irrespective of whether such dividends were
                     earned, declared or legally available, and the holders of
                     the Series A Shares shall not be entitled to any further
                     payment in connection with the voluntary or involuntary
                     liquidation, dissolution or winding up of the Company
                     except as expressly provided for in this resolution.  If,
                     upon such liquidation, dissolution or winding up of the
                     Company, the assets of the Company available for
                     distribution to the holders of the Series A Shares and the
                     holders of Parity Shares, if any, shall be insufficient to
                     permit the distribution in full of the amounts receivable
                     as aforesaid by the holders of the Series A Shares and the
                     amounts receivable by the holders of Parity Shares, if
                     any, then all such assets of the Company shall be
                     distributed ratably among the holders of the Series A
                     Shares and the holders of Parity Shares, if any, in
                     proportion to the amounts that each would have been
                     entitled to receive if such assets were sufficient to
                     permit distribution in full as aforesaid.  Neither the
                     consolidation or merger of the Company with or into any
                     corporation or corporations, nor the sale, lease or
                     transfer by the Company of all or any part of its assets,
                     nor the reduction of the authorized or  issued shares of
                     the Company of any class, whether now or hereafter
                     authorized, shall be deemed to be a liquidation,
                     dissolution or winding up of the Company for the purposes
                     of this Section 1.  Written notice of any voluntary or
                     involuntary
        




                                       8
<PAGE>   41
                     liquidation, dissolution or winding up of the Company,
                     setting the payment date and the place where the amounts
                     to be distributed shall be paid and containing a reference
                     to the conversion option granted by Section 2 hereof,
                     shall be given not less than thirty (30) days prior to the
                     payment date stated therein to the holders of record of
                     the Series A Shares at their respective addresses as the
                     same shall appear on the stock ledger of the Company."
        
         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the numbered
         paragraph 2(a) thereof, so that as amended, said paragraph 2(a) shall
         read as follows:

                 2.       Conversion.

                          (a)  Subject to the terms and conditions of this
                 Section 2, the Series A Shares shall be convertible, at any
                 time and from time to time, at the option of the holder
                 thereof, into Common Shares by surrender of the certificate or
                 certificates for the Series A Shares to be so converted, duly
                 endorsed, at the principal office of the Company (or at such
                 other place or places as may be designated by the Company from
                 time to time by notice sent to the holders of the Series A
                 Shares at their respective addresses as the same shall appear
                 on the stock ledger of the Company) or at the corporate trust
                 office of any transfer agent for the Series A Shares at any
                 time during normal business hours, together with notice that
                 the holder elects to convert such Series A Shares, or a stated
                 number of such shares, in accordance with the provisions of
                 this Section 2.  Such notice shall also state the name or
                 names (with addresses) in which the certificate or
                 certificates for Common Shares shall be issued.  The number of
                 Common Shares that any such holder shall receive in return for
                 each Series A Share converted by such holder shall be computed
                 by dividing (x) $22.7280 (as adjusted for any stock split,
                 reverse stock split, stock dividend or similar event





                                       9
<PAGE>   42
                 resulting in a change in the Series A Shares) by (y) the 
                 Conversion Price then in effect."

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the first sentence of
         paragraph 2(c) thereof, so that as amended, said sentence shall read
         as follows:

                       2.(c) The initial Conversion Price shall be $5.6820."

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be amended by changing the numbered paragraph 4(a)
         thereof, so that as amended, said paragraph 4(a) shall read as
         follows:

                 4.       Dividends.

                          (a) The holders of the Series A Shares shall be
                 entitled to receive out of funds legally available therefor,
                 cumulative cash dividends at the rate of 6% per annum of the
                 Liquidation Value per Series A Share ($22.7280, as adjusted
                 for any stock split, reverse stock split, stock dividend or
                 similar event resulting in a change in the Series A Shares)
                 (the "Dividend Rate"), payable on June 30 of each year in
                 which any Series A Shares shall be outstanding, commencing
                 June 30, 1987, to the holders of record of such Series A
                 Shares on the respective dates fixed for such purpose by the
                 Board of Directors of the Company in advance of payment of
                 each dividend.  Dividends on each Series A Share shall be
                 cumulative from the date of issue thereof.  The first dividend
                 payable with respect to any Series A Share shall be computed
                 by multiplying the Dividend Rate by a fraction of which (i)
                 the numerator shall be the number of days from the date of
                 issue of such Series A Share through the date as of which such
                 first dividend is payable, inclusive, and (ii) the denominator
                 shall be 360."





                                       10
<PAGE>   43
         Upon the filing in the Office of the Secretary of State of Delaware of
this Certificate of Amendment, each twenty issued and outstanding shares of
common stock shall thereby and thereupon be combined into one share of common
stock and each twenty issued and outstanding shares of Series A Non-Voting
Convertible 6% Cumulative preferred stock shall thereupon be combined into one
share of Series A Non-Voting Convertible 6% Cumulative preferred stock.  Each
certificate that theretofore represented shares of common stock prior to the
filing of this Certificate of Amendment shall thereafter represent the number
of shares of common stock into which the shares of common stock represented by
such certificate shall be combined, and each certificate that theretofore
represented shares of Series A Non-Voting Convertible 6% Cumulative preferred
stock prior to the filing of this Certificate of Amendment shall thereafter
represent the number of shares of Series A Non-Voting Convertible 6% Cumulative
preferred stock into which the shares of Series A Non-Voting Convertible 6%
Cumulative preferred stock represented by such certificate shall be combined.
To the extent a shareholder holds a number of shares of common stock not evenly
divisible by twenty, such shareholder will receive cash for each fractional
interest resulting from such division.

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Amendment to be signed by Thomas C. Brown, its Chairman of the Board of
Directors, and attested by Regina Neill, its Assistant Secretary, this 7th day
of September, 1988.


                                        TOM BROWN, INC.


                                          /s/ Thomas C. Brown
                                        --------------------------------
                                        Thomas C. Brown, Chairman of
                                             the Board of Directors
ATTESTED:


  /s/ Regina Neill         
- - ----------------------------  
Regina Neill, Assistant
  Secretary



         The undersigned Chairman of the Board of Directors of Tom Brown, Inc.,
being duly sworn, does verify that the foregoing instrument represents the act
and deed of Tom Brown, Inc. and that the facts stated in such instrument are
true.


                                          /s/ Thomas C. Brown
                                        ----------------------------------
                                        Thomas C. Brown, Chairman of
                                        the Board of Directors





                                       11
<PAGE>   44



THE STATE OF TEXAS        )       
                          )       
COUNTY OF MIDLAND         )       


         Before me, the undersigned authority, on this day personally appeared
THOMAS C. BROWN and REGINA NEILL, Chairman of the Board of Directors and
Assistant Secretary, respectively, of Tom Brown, Inc., a corporation formed
under the laws of the State of Delaware, known to me to be the individuals
whose names are subscribed to the foregoing instrument, and acknowledged and
swore to me that they each executed the same for the purposes and consideration
therein expressed and as the act and deed of said corporation and that the
facts stated in the foregoing instrument are true.



         GIVEN UNDER MY HAND AND SEAL OF OFFICE this 7th day of September, 1988.


                                          /s/ Rita K. Turner
                                        --------------------------------
                                        Name  Rita K. Turner
                                            ---------------------------- 
                                            Notary Public in and for
                                             the State of Texas

Commission Expires:

  10/23/89          
- - --------------------









                                       12
<PAGE>   45

                        CERTIFICATE OF AMENDMENT TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.


         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation"), does
hereby certify as follows:

         Pursuant to the provisions of the Delaware General Corporation Law,
the Board of Directors and th