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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.




                                      -2-
<PAGE>   3

         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 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


                                      -3-
<PAGE>   4

                  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.

         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.




                                      -4-
<PAGE>   5

                  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.




                                      -5-
<PAGE>   6

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 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 



                                      -6-
<PAGE>   7

                  paragraph (b) hereof, the Corporation shall 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 stockholders) that the
                  claimant has 



                                      -7-
<PAGE>   8

                  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 





<PAGE>   10

         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
         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 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.



                                      -2-
<PAGE>   11

                  (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
                  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.




                                      -3-
<PAGE>   12

                           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 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 



                                      -4-
<PAGE>   13

                           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 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 



                                      -5-
<PAGE>   14

                           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 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, 


                                      -6-
<PAGE>   15

                           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) 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 



                                      -7-
<PAGE>   16

                           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 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 



                                      -8-
<PAGE>   17

                           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 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, 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 



                                      -9-
<PAGE>   18

         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 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




                                      -10-
<PAGE>   19

         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 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)




                                      -11-
<PAGE>   20

         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 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 



                                      -12-
<PAGE>   21

         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 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 



                                      -13-
<PAGE>   22

         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 ($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.




                                      -14-
<PAGE>   23

                  (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
         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 


                                      -15-
<PAGE>   24

         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, 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




                                      -16-
<PAGE>   25

         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.

                  "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




                                      -17-
<PAGE>   26
                             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:

<TABLE>
<CAPTION>

                      Name of Corporation              State
                      -------------------              -----
<S>                                                    <C>    
                         Tom Brown, Inc.               Nevada

                         Tom Brown, Inc.               Delaware
</TABLE>

         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.



<PAGE>   27

         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.

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




                                      -2-
<PAGE>   28




                       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:

<TABLE>
<CAPTION>

              Name of Corporation                             State
              -------------------                             -----
<S>                                                    <C>    
              TBI Management, Inc.                           Texas

              Tom Brown, Inc.                                Delaware
</TABLE>

         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>   29





                                   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



                                      -2-
<PAGE>   30





                      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:

<TABLE>
<CAPTION>

            Name of Corporation                                   State
            -------------------                                   -----
<S>                                                              <C>    
            General Resources, Inc.                              Texas

            Tom Brown, Inc.                                      Delaware
</TABLE>

         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>   31
                                    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



                                      -2-
<PAGE>   32





                        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 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

<PAGE>   33

                           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

                           9.       Repurchase obligations of the Corporation
                                    with respect to the shares of each series.


                                      -2-
<PAGE>   34

                           Any of the Series Terms, including voting rights, of
                           any series may be made dependent upon facts
                           ascertainable out-side 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 pro-visions 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 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.


                                      -3-
<PAGE>   35

                           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 the Corporation are junior and
                           subordinate to the rights of the holders of such
                           class or series of stock.



                                      -4-
<PAGE>   36


                           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 



                                      -5-
<PAGE>   37

                                    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 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 



                                      -6-
<PAGE>   38

         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 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 



                                      -7-
<PAGE>   39

                  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 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:



                                      -8-
<PAGE>   40

                  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 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:




                                      -9-
<PAGE>   41

                  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."

         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.



                                      -10-
<PAGE>   42


                                                    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>   43




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