Document:

<PAGE>
                                                                    EXHIBIT 10.2

                            REIMBURSEMENT AGREEMENT

                                 BY AND BETWEEN

                        TERAFORCE TECHNOLOGY CORPORATION

                                      AND

                                O.S. WYATT, JR.

                          Dated as of October 12, 2001
<PAGE>
                               TABLE OF CONTENTS

<Table>
<Caption>
                                                                            Page
                                                                            ----
<S>                                                                          <C>
ARTICLE I      GENERAL TERMS...................................................2
     Section 1.1.  Definitions.................................................2
     Section 1.2.  Interpretation..............................................4

ARTICLE II     THE GUARANTIES..................................................5

ARTICLE III    REIMBURSEMENT...................................................5
     Section 3.1.  Reimbursable Amounts and Other Payments.....................5
     Section 3.2.  Obligations Absolute........................................5
     Section 3.3   Security Interest...........................................6
     Section 3.4   Indemnity...................................................6

ARTICLE IV     ADDITIONAL AGREEMENTS...........................................6
     Section 4.1.  Payment Obligations.........................................6

ARTICLE V      WARRANTS........................................................7
     Section 5.1.  Warrants....................................................7
     Section 5.2.  Additional Warrants.........................................7
     Section 5.3.  Registration Rights.........................................7

ARTICLE VI     ADDITIONAL GUARANTORS...........................................7
     Section 6.1   Adding Additional Guarantors................................7
     Section 6.2   Consideration for Additional Guarantees.....................7
     Section 6.3   Reimbursement Obligation....................................8

ARTICLE VII    REPRESENTATIONS AND WARRANTIES..................................8
     Section 7.1.  Representations and Warrants of the Company.................8

ARTICLE VIII   AFFIRMATIVE COVENANTS...........................................9
     Section 8.1   Conduct of Business.........................................9

ARTICLE IX     NEGATIVE COVENANTS..............................................9
     Section 9.1.  Restrictions on Borrowing...................................9
     Section 9.2.  Liens and Pledges of Assets and Stock.......................9
     Section 9.3   No Mergers, etc.............................................9

ARTICLE X      COVENANTS.......................................................9
     Section 10.1  Successors and Assigns......................................9
     Section 10.2. Notices.....................................................9
</Table>

                                      -ii-
<PAGE>
<Table>
<Caption>
<S>                                                                          <C>
     Section 10.3. Amendment..................................................10
     Section 10.4. Effect of Delay and Waivers................................10
     Section 10.5. Counterparts...............................................10
     Section 10.6. Severability...............................................11
     Section 10.7. Governing Law and Jurisdiction.............................11
     Section 10.8. Consent....................................................11
</Table>

                                     -iii-
<PAGE>
                            REIMBURSEMENT AGREEMENT

     This REIMBURSEMENT AGREEMENT dated as of October 12, 2001, (the
"Agreement), is made by and between TERAFORCE TECHNOLOGY CORPORATION, a Delaware
corporation (the "Company"), and O.S. WYATT, JR., an individual residing in
Harris County, Texas ("Wyatt or "Guarantor") and such other parties that may be
added from time to time pursuant to Article IV herein; (the Company and
Guarantor collectively referred to as the "Parties")

                              W I T N E S S E T H:

     WHEREAS, effective June 1, 2001, the Company entered into a loan
arrangement with Bank One, N.A. (the "Bank") providing for the loan of up to
$4,500,000 to the Company (the "June Loan Agreement"); and

     WHEREAS, in order to induce the Bank to enter into the June Loan Agreement,
Wyatt and certain other persons issued letters of credit in the aggregate face
amount of $5,000,000 (the "Letters of Credit") in order to secure the loan
thereunder; and

     WHEREAS, due to a need for additional capital and to maintain financial
flexibility, effective the date hereof, the Company desires to enter into a
revolving loan agreement with the Bank which would enable the Company to have a
line of credit to borrow at any one time up to $1,500,000, subject to the terms
and conditions therein (the "Loan Agreement"); and

     WHEREAS, in order to induce the Bank to enter into the Loan Agreement,
pursuant to consideration to be given by the Company to Guarantor, Guarantor has
or will execute a limited guaranty agreement to secure the Company's obligations
under the Loan Agreement (the "Guaranty"); and

     WHEREAS, the Bank shall provide Advances (as hereinafter defined) to the
Company in accordance with the provisions of the Loan Agreement and, subject to
the terms and conditions of the Loan Agreement, shall be entitled to make demand
upon Guarantor pursuant to the provisions of Guaranty in the cas of an Event of
Default (as defined in the Loan Agreement) by the Company under the Loan
Agreement or Loan Documents (as hereinafter defined); and

     WHEREAS, Guarantor agreed to execute the Guaranty provided that the Company
executes and delivers this Agreement, subject to the terms and conditions
provided herein;

     NOW, THEREFORE, in consideration of the foregoing, the Company hereby
covenants and agrees with Guarantor as follows:
<PAGE>
                                   ARTICLE I
                                 GENERAL TERMS

     Section 1.1. Definitions. As used in this Agreement, the following terms
shall have the following meanings:

          "Advances" shall mean an advance of funds under and subject to the
terms and conditions of the Loan Agreement and other Loan Documents, provided
that the principal amount outstanding shall never exceed the Loan Maximum.

          "Agreement" shall have the meaning specified in the preamble.

          "Associated Expenses" shall mean the expenses associated with
recovering the Guarantor Advances, excluding the Guarantor Advances and
interest thereon.

          "Bank" shall have the meaning set forth in the recitals.

          "Common Stock" shall mean the common stock, par value $0.01, of the
Company.

          "Company" shall have the meaning specified in the preamble.

          "Demand for Reimbursement" shall have the meaning specified in Section
3.1(a).

          "Draft" means, with respect to a Guaranty, any negotiable or
non-negotiable instrument or demand for payment on a Guaranty.

          "Excess Amount" shall have the meaning specified in Section 4.1.

          "Governmental Authority" means any United States or foreign federal,
territorial, state or local governmental authority, quasi-governmental
authority, instrumentality, court, government or self-regulatory organization,
commission, tribunal or organization or any regulatory, administrative or other
agency, or any political or other subdivision, department or branch of any of
the foregoing.

          "Guarantor Advance" shall mean the amount of money advanced by the
Guarantor to the Bank pursuant to a demand for payment by the Bank on his
Guaranty.

          "Guarantor" shall have the meaning specified in the preamble.

          "Guaranties" and "Guaranty" shall have the meaning set forth in the
recitals.

          "Issuers" shall mean those parties issuing the Letters of Credit in
the Original Reimbursement Agreement. Specifically, the Issuers are O.S. Wyatt,
Jr., Fayez Sarofim and Morton A. Cohn.

                                       2

<PAGE>
     "June Loan Agreement" shall have the meaning set forth in the recitals.

     "Letters of Credit" shall have the meaning set forth in the recitals.

     "Lien" means any lien, mortgage, security interest, pledge, assignment,
charge, title retention agreement or encumbrance of any kind and any other
arrangement for a creditor's claim to be satisfied from assets or proceeds
prior to the claims of other creditors or the owners.

     "Loan" shall mean the term Loan entered into by and between the Company
and the Bank effective the date hereof.

     "Loan Agreement" shall have the meaning set forth in the recitals.

     "Loan Documents" shall mean the Loan Agreement with the Bank and all
exhibits and related documents thereto, as they may be amended, extended or
modified from time to time, including, without limitation, a promissory note.

     "Loan Maximum" shall mean the principal amount outstanding of One Million
Five Hundred Thousand Dollars ($1,500,000), as such amount may be increased by
agreement from time to time between the Company and the Bank.

     "Major Transaction" shall mean (i) the closing of the sale of any business
or assets of the Company or any subsidiary of the Company, or (ii) the
settlement of litigation or the collection by the Company of a final judgment
in such litigation, provided such sale, settlement, or collection results in
net cash proceeds to the Company of more than Ten Million Dollars ($10,000,000).

     "Original Reimbursement Agreement" shall mean that certain Reimbursement
Agreement dated June 1, 2001 among the Company, and O.S. Wyatt, Jr., Fayez
Sarofim, and Morton Cohn.

     "Permitted Liens" means (a) Liens for taxes or governmental assessments,
employee benefit obligations, charges or claims the payment of which is not yet
due, or are being contested in good faith for which adequate reserves have been
established or (b) statutory Liens of landlords and Liens of carriers,
warehousemen, mechanics, materialmen and other similar Persons and other Liens
imposed by applicable law incurred in the ordinary course of business for sums
not yet delinquent or not material in amount and being contested in good faith.

     "Person" means an individual, corporation, partnership, association,
limited liability company, trust, estate or other similar business entity or
organization, including a Governmental Authority.

     "Redemption Obligations" means, at any time, the aggregate of all
obligations of the Company to reimburse Guarantor under Section 2.1(a).

     "Registration Rights Agreement" shall have the meaning specified in
Section 5.2.

                                       3

<PAGE>
          "Reimbursement Obligation" shall have the meaning specified in Section
3.1(a).

          "Related Documents" shall mean the Warrants, the Replacement Warrants
and the Registration Rights Agreement.

          "Security Agreement" shall have the meaning specified in Section 3.3.

          "Warrants" shall have the meaning specified in Section 5.1.

     Section 1.2. Interpretation.

          (a)  In this Agreement:

               (i)    the singular number includes the plural number and vice
versa;

               (ii)   reference to any gender includes each other gender;

               (iii)  the words "herein," "hereof" and "hereunder" and other
words of similar import refer to this Agreement as a whole and not to any
particular Article, Section or other subdivision;

               (iv)   reference to any Person includes such Person's heirs,
administrators, successors and assigns but, if applicable, only if such heirs,
administrators, successors and assigns are permitted by this Agreement, and
reference to a Person in a particular capacity excludes such Person in any other
capacity or individually, provided that nothing in this subclause (iv) is
intended to authorize any assignment not otherwise permitted by this Agreement;

               (v)    reference to any agreement, document or instrument means
such agreement, document or instrument as amended, supplemented or modified and
in effect from time to time in accordance with the terms thereof and, if
applicable, the terms hereof, and reference to the Note includes any Note issued
pursuant hereto in extension or renewal hereof and in substitution or
replacement herefor;

               (vi)   unless the context indicates otherwise, reference to any
Article, Section, Schedule or Exhibit means such Article or Section hereof or
such Schedule or Exhibit hereto;

               (vii)  the words "including" (and with correlative meaning
"include") means including, without limiting the generality of any description
preceding such term;

               (viii) with respect to the determination of any period of time,
the word "from" means "from and including" and the word "to" means "to, but
excluding";

               (ix)   reference to any law means such as amended, modified,
codified or reenacted, in whole or in part, and in effect from time to time; and

                                       4

<PAGE>
          (b)  No provision of this Agreement shall be interpreted or construed
against any Person solely because that Person or its legal representative
drafted such provision.

                                   ARTICLE II
                                 THE GUARANTIES

     Section 2.1 Guaranty.  On the terms and subject to the terms hereof,
Guarantor agrees to issue the Guaranty to the Bank in order to fully secure the
Company's obligations under the Loans. The Guaranty shall be substantially in
the form attached hereto as Exhibit A.

                                  ARTICLE III
                                 REIMBURSEMENT

     Section 3.1. Reimbursable Amounts and Other Payments.

          (a)  Amounts.  The Company shall reimburse Guarantor the amount paid
by Guarantor to the Bank equal to the amount of his Guarantor Advance and any
taxes, fees, changes or other costs and expenses incurred by Guarantor in
connection with such payment (the "Reimbursement Obligation"). Each such
Reimbursement Obligation shall be paid by the Company to Guarantor promptly upon
written demand from Guarantor ("Demand for Reimbursement"), but in no event
later than thirty (30) days after such demand. Each such Demand for
Reimbursement, in order to be valid, shall be accompanied by sufficient
documentation supporting the amount of the Reimbursement Obligation.

          (b)  Interest.  The Company shall pay interest on any and all amounts
remaining unpaid under Section 3.1(a) at any time from the date such amounts
become payable until paid in full, payable on demand, at simple interest at the
prime rate established by Bank One, N.A., plus 2.0% per annum (or, if less, the
highest rate permitted under applicable law).

          (c)  Currency.  All payments by the Company to Guarantor shall be made
in lawful currency of the United States of America and in immediately available
funds at, and pursuant to, such instructions as Guarantor may from time to time
give.

     Section 3.2.   Obligations Absolute.

          (a)  The Company's obligations under this Article III shall be
absolute and unconditional irrespective of any set-off, counterclaim, or defense
to payment which the Company may have or have had against the Bank.

          (b)  The Company hereby agrees that Guarantor shall not be responsible
for, and the Reimbursement Obligations shall not be affected by, among other
things,

               (i)  the validity or genuineness of documents or of any
               endorsements thereon even though such documents shall prove to be
               invalid, fraudulent, or forged;

               (ii) any dispute between the Company and the Bank; or

                                       5

<PAGE>

               (iii) any claims whatsoever of the Company against the Bank.

          (c)  Guarantor shall not be liable for any error, omission,
interruption or delay in transmission, dispatch or delivery of any message or
advice, howsoever transmitted, in connection with the Guaranty, except for
errors or omissions caused by Guarantor's primary negligence or willful
misconduct.

          (d)  The Company agrees that any action taken or omitted by the
Guarantor in connection with the Guaranty, provided Guarantor's actions are not
the result of Guarantor's primary negligence, willful misconduct, or breach of
contractual obligations, shall be binding on the Company and shall not result in
any liability to Guarantor.

     Section 3.3 Security Interest  The Company hereby appoints Wyatt as its
true and lawful attorney-in-fact to execute and deliver on the Company's behalf
the Security Agreement upon the occurrence of any Reimbursement Obligation, the
form of which is attached as Exhibit B, (the "Security Agreement") and execute
and file any necessary UCC financing statements, to grant to Guarantor a valid
lien and security interest, which shall be subject to and subordinated to any
lien(s) and security interests created in the Accounts and Inventory (each as
defined in the Security Agreement) of the Company, pursuant to the Original
Reimbursement Agreement.

     Section 3.4 Indemnity  In addition the rights and obligations set forth in
Section 3.1(a), the Company hereby agrees to indemnify and hold harmless
Guarantor, and each of his respective successors, heirs and assigns, from and
against any and all claims and damages, losses, liabilities, costs or expenses
(including reasonable attorneys fees) which Guarantor may incur by reason of or
in connection with the issuance, execution and delivery or transfer or payment
or failure to pay the Guaranty except to the extent of the primary negligence or
willful misconduct of Guarantor, or as may be attributable to Guarantor's breach
of his obligations under this Agreement.

                                   ARTICLE IV
                             ADDITIONAL AGREEMENTS

     Section 4.1 Payment Obligations.

          (a)  Upon the closing of a Major Transaction pursuant to which the
Company receives cash consideration, after repayment by the Company of its
obligations to the Bank under the June Loan Agreement and the Loan Agreement and
the Loan Documents, together with any related costs and expenses, including
attorneys fees, and after repayment by the Company of its obligations to the
parties under the Original Reimbursement Agreement, the Company shall pay an
aggregate sum of Three Hundred Ninety-Six Thousand Dollars ($396,000.00) to
Wyatt (the "Excess Amount").

          (b)  In the event Paragraph 3.4 of the Warrants results in a re-set of
the exercise price of the Warrants, to the extent all of the Warrants are
outstanding and held by Wyatt, the Company shall pay to Wyatt the aggregate sum
of One Hundred Ninety-Eight Thousand Dollars ($198,000.00).

                                       6

<PAGE>
                                   ARTICLE V
                                    WARRANTS

     Section 5.1    Warrants.  As an additional inducement to enter into this
Agreement, the Company agrees to issue to Wyatt Warrants to purchase an
aggregate of 360,000 shares of Common Stock at an exercise price per share of
NO AND 20/100 DOLLARS ($0.20), the form of which is attached as Exhibit C (the
"Warrants").

     Section 5.2    Additional Warrants.  As an inducement to enter into this
Agreement, but for which Wyatt would not do, the Company agrees to issue to
Wyatt Warrants to purchase an aggregate of 600,000 shares of Common Stock at
an exercise price per share of NO AND 80/100 DOLLARS ($0.80), the form of which
is attached as Exhibit D (the "Additional Warrants").

     Section 5.3    Registration Rights.  The Company further agrees to grant
the registration rights to register the resale of the shares of Common Stock to
be issued pursuant to the Warrants and the Additional Warrants in accordance
with the Registration Rights Agreement attached hereto as Exhibit E (the
"Registration Rights Agreement").

                                   ARTICLE VI
                             ADDITIONAL GUARANTORS

     Section 6.1    Adding Additional Guarantors.  From time to time the
Company may seek to increase the amount available for borrowing under the Loan
Agreement and may seek additional Guarantors to increase the amount guaranteed
by Wyatt. The granting of such additional credit and the acceptance of
additional Guarantors or the increase in the amount guaranteed by existing
guarantors will be subject to the approval and consent of the Bank and the
Company. The maximum aggregate amount of such additional credit shall be up to
$1,500,000, in increments of not less than $500,000.

     Section 6.2    Consideration for Additional Guarantees.  For each $500,000
of additional credit provided to the Company by the Bank as a result of the
execution of new or amended guarantees of such credit, the guarantors providing
such additional guarantee shall receive the following consideration:

               (a)  Payment Obligations.  Pursuant to and in accordance with
the terms and conditions of Section 4.1(a) herein, the aggregate sum of
$132,000 to be divided among the guarantors in proportion to their respective
amounts guaranteed. Pursuant to and in accordance with the terms and conditions
of Section 4.1(b) herein, the aggregate sum of $66,000 to be divided among the
guarantors in proportion to their respective amounts guaranteed.

               (b)  Warrants.  Warrants for the purchase of an aggregate of
120,000 shares of Common Stock at an exercise price of $0.20 pursuant to the
terms and conditions of Section 5.1 herein to be divided among the guarantors
in proportion to their respective amounts guaranteed. Warrants for the purchase
of an aggregate of 200,000 shares of Common Stock at an exercise price of $0.80
per share pursuant to the terms and conditions of Section 5.2 herein to be
divided among the guarantors in proportion to their respective amounts
guaranteed.

                                       7

<PAGE>
          (c) Registration Rights. Registration rights relating to such warrants
pursuant to the terms and conditions of Section 5.3 herein.

     Section 6.3 Reimbursement Obligation. Each additional guarantor shall
execute such documents as may be required in order to be subject to the terms
and conditions of this Agreement as a guarantor and the Company shall execute
such documents as may be reasonably necessary to confirm the reimbursement of
such obligations pursuant to Article III of this Agreement.

                                  ARTICLE VII
                         REPRESENTATIONS AND WARRANTIES

     Section 7.1. Representations and Warrants of the Company. The Company
hereby represents and warrants to Guarantor as follows:

          (a) Corporate Existence and Good Standing. The Company is a
corporation duly incorporated, validly existing and in good standing under the
laws of the State of Delaware and has all requisite corporate power and
authority to own its property and carry on its business as now conducted, and is
in good standing and authorized to do business in each jurisdiction in which the
Company owns real property or conducts such business, where the failure to
maintain such good standing or authorization is reasonably expected to have a
materially adverse effect on its business, operations or financial or other
condition, or could materially adversely affect its ability to perform its
obligations under this Agreement.

          (b) Authorization and Validity. This Agreement and Related Documents
have been duly authorized by all necessary corporate action, and each has been
duly executed and delivered by the Company and each is valid, binding and
enforceable against the Company in accordance with its terms except as may be
limited by bankruptcy or insolvency laws and similar laws affecting creditor
rights generally and by general principles of equity.

          (c) No Conflict; Government Consent; Title to Assets; No Liens.
Neither the execution and delivery of this Agreement and Related Documents, nor
the consummation of the transactions contemplated hereby or thereby nor
compliance with the terms hereof or thereof under the circumstances contemplated
hereby or thereby will conflict with, are prohibited by or will contravene,
violate or constitute a breach of or a default under the Amended and Restated
Certificate of Incorporation or By-Laws of the Company or constitute on the part
of the Company a material breach of or a material default under any agreement or
other instrument to which the Company is a party or any existing law,
administrative regulation, or, to its knowledge, any court order or consent
decree to which the Company is subject, or by which any of its properties is
bound.

          7.2 Representations of Guarantor. Guarantor represents and warrants
to the Company that he has full power and authority to execute and deliver this
Agreement and the Related Documents, and that this Agreement and Related
Documents are valid, binding and enforceable in accordance with their terms as
they relate to such Guarantor, except as may be limited by bankruptcy and
insolvency laws, and similar laws affecting creditors rights generally and by
general principals of equity. Guarantor represents and warrants to the Company
that the provisions of Section 2.3 of

                                       8

<PAGE>
the Warrant and the Additional Warrant are true and correct as though made on
the date hereof, and will be true and correct on the date of exercise of the
Warrant and the Additional Warrant.

                                  ARTICLE VIII
                             AFFIRMATIVE COVENANTS

     Section 8.1.   Conduct of Business.  The Company covenants and agrees that
it shall remain duly incorporated, validly existing and in good standing as a
domestic corporation in the State of Delaware, will not voluntarily dissolve
without first discharging its obligations under this Agreement.

                                   ARTICLE IX
                               NEGATIVE COVENANTS

     Section 9.1.   Restrictions on Borrowing.  So long as the Guaranty is
outstanding, except for obligations of the Company on the date hereof or under
the Loan Agreement, or which may arise under the Original Reimbursement
Agreement, and extensions or refinancings under such agreements, the Company
shall not, nor permit any of its subsidiaries to, create, incur, assume or
suffer to exist any liability for borrowed money with an aggregate amount
outstanding in excess of $1,000,000, without the consent of Guarantor, which
consent shall not be unreasonably withheld.

     Section 9.2.   Liens and Pledges of Assets and Stock.  So long as the
Guaranty is outstanding, the Company shall not create, incur, assume or suffer
to exist, directly or indirectly, any Lien on its assets without the consent of
Guarantor, which consent shall not be unreasonably withheld; provided, however,
that this Section 9.2 shall not prohibit the Company from creating, assuming or
suffering to exist the following Liens: (i) Liens existing as of the date hereof
and renewals and replacements thereof or the repledging of assets pledged
thereunder; (ii) Liens incurred in the ordinary course of business not in
connection with the borrowing of money; (iii) Liens arising out of the Original
Reimbursement Agreement and the documents in connection therewith; (iv) Liens
arising from this Agreement and the documents in connection therewith; and (v)
Permitted Liens.

     Section 9.3.   No Mergers, etc.  Except as otherwise permitted in the Loan
Agreement or herein, the Company will not sell, transfer or otherwise dispose of
all or substantially all of its assets (either in a single transaction or in a
series of related transactions), and will not merge into or consolidate with any
partnership, corporation or other entity and will not permit one or more
partnerships, corporations or other entities to merge into or consolidate with
it without the prior express written consent of Guarantor, which consent will
not be unreasonably withheld.

                                   ARTICLE X
                                   COVENANTS

     Section 10.1.  Successors and Assigns.  This Agreement shall be binding
upon each party and their respective successors, heirs and assigns.

     Section 10.2.  Notices.  All notices, requests and demands to or upon the
respective parties shall be in writing (including by facsimile) and, unless
otherwise expressly provided herein, shall

                                       9

<PAGE>
be deemed to have been duly given or made (a) in the case of delivery by hand,
when delivered, (b) in the case of delivery by mail, three (3) days after being
deposited in the mails, postage prepaid, or (c) in the case of delivery by
facsimile, when sent and receipt has been confirmed, addressed as follows:

          If to Wyatt:        O. S. Wyatt, Jr.
                              8 Greenway Plaza, Suite 930
                              Houston, Texas 77046
                              Telecopier: (713) 877-7192

          If to the Company:  TeraForce Technology Corporation
                              Attn.: Herman M. Frietsch, Chairman & CEO
                              1240 East Campbell Road
                              Richardson, Texas 75081
                              Telecopier: (469) 330-4999

          with a copy to:     Bisk & Fitch, L.L.P.
                              Attn.: Michael T. Larkin, Esq.
                              24 Greenway Plaza, Suite 750
                              Houston, Texas 77046
                              Telecopier: (713) 871-0721

     Any entity entitled to receive notice hereunder may, by notice given
hereunder, designate any further or different addresses to which subsequent
notices, certificates or other communications shall be sent.

     Section 10.3. Amendment. This Agreement may be amended, modified or
discharged only upon an agreement in writing of the Company and Guarantor.

     Section 10.4. Effect of Delay and Waivers. No delay or omission to exercise
any right or power accruing upon any default, omission or failure of performance
hereunder shall impair any such right or power or shall be construed to be a
waiver thereof, but any such right and power may be exercised from time to time
and as often as may be deemed expedient. In order to entitle Guarantor to
exercise any remedy now or hereafter existing at law or in equity or by statute,
it shall not be necessary to give any notice, other than such notice as may be
herein expressly required. In the event any provision contained in this
Agreement should be breached by any party and thereafter waived by the other
party so empowered to act, such waiver shall be limited to the particular breach
so waived and shall not be deemed to waive any other breach hereunder. No
waiver, amendment, release or modification of this Agreement shall be
established by conduct, custom or course of dealing, but solely by an instrument
in writing duly executed by the parties thereunto duly authorized by this
Agreement.

                                       10
<PAGE>
     Section 10.5. Counterparts. This Agreement may be executed simultaneously
in counterparts, each of which shall be deemed an original, but both of which
together shall constitute one and the same instrument.

     Section 10.6. Severability. The invalidity or unenforceability of any one
or more phrases, sentences, clauses or Sections contained in this Agreement
shall not affect the validity or enforceability of the remaining portions of
this Agreement, or any part thereof. In particular, this section means (among
other things) that the Company does not agree or intend to pay, and Guarantor
does not agree to contract for, charge, collect, take, reserve or receive
(collectively referred to herein as "charge or collect"), any amount in the
nature of interest or in the nature of a fee for anything construed to be a
loan, which would in any way or event (including demand, prepayment, or
acceleration) cause Guarantor to charge or collect more for entering into this
Agreement than the maximum amount Guarantor would be permitted to charge or
collect by federal law or the laws of the State of Texas. Any such excess
interest or unauthorized fee shall, instead or anything stated to the contrary,
be applied first to reduce the principal balance of the loan, if any, and when
the principal has been paid in full, refunded to the Company.

     Section 10.7. Governing Law and Jurisdiction.

This Agreement shall be governed by and construed in accordance with the laws
of the State of Texas.

     Section 10.8 Consent. By signing this Agreement, Wyatt irrevocably
consents to the Company entering into the Loan Agreement, notwithstanding
anything to the contrary in the Original Reimbursement Agreement.

                                       11
<PAGE>
This Agreement has been signed by the Company as of the date first above
written.

                              COMPANY:

                              TeraForce Technology Corporation

                              By: /s/ Herman M. Frietsch
                                  ----------------------------------------
                                   Herman M. Frietsch, Chairman & CEO

                              GUARANTOR:

                              /s/ O. S. Wyatt, Jr.
                              --------------------------------------------
                              O. S. Wyatt, Jr.

                                       12<PAGE>
                                                                     EXHIBIT 4.1

                       PART I TIDELANDS ROYALTY TRUST "B"
                                    INDENTURE

<PAGE>

                           TIDELANDS ROYALTY TRUST "B"
                                   INDENTURE

         This Indenture of Trust, hereinafter called "Indenture," made and
         entered into at Dallas, Texas, by and between the undersigned parties,
         designated and hereinafter called "Unit Holders," and REPUBLIC NATIONAL
         BANK of DALLAS, a national banking association with offices at Dallas,
         Texas, hereinafter called "Corporate Trustee" and L. C. PASLAY of
         Dallas, Texas, hereinafter called "Individual Trustee," the Corporate
         Trustee and the Individual Trustee being herein collectively called the
         "Trustees,"

                                   WITNESSETH

     By instrument dated April 30, 1951, hereinafter referred to as "Purchase
Agreement," a true copy of which (except for the names of the Purchaser and
except for Exhibit C attached thereto), is attached hereto, marked Appendix 1,
and is made a part hereof, W. L. MOODY, III, MARINE INSTRUMENT COMPANY, MEXICAN
GULF SULPHUR COMPANY, and R. A. IRWIN, individually, and WRIGHT MORROW and ETHAN
STROUD, trustees, therein and herein collectively referred to as "Seller," and
certain oil companies, therein and herein referred to as "Purchaser," entered
into an agreement whereby Seller granted, bargained, sold and conveyed to
Purchaser certain geophysical data, records, and information pertaining to
certain areas of submerged lands in the Gulf of Mexico, outlined on Exhibit A
attached to the Purchase Agreement. As part of the consideration for such sale,
Purchaser agreed, upon the terms and conditions and subject to the contingencies
set out in the Purchase Agreement, during the five year period from and after
April 30, 1951, to make certain production payments and overriding royalty
payments to the RE

<PAGE>
                                       3

PUBLIC NATIONAL BANK OF DALLAS as Fiscal Agent for Seller, and after April 30,
1956, to assign to the owners of the interest of Seller under said Purchase
Agreement certain production payments and overriding royalty interests
pertaining to any of the area outlined on Exhibit C attached to the original
executed copy of the Purchase Agreement upon which Purchaser may within fifty
(50) years from the effective date of the Purchase Agreement acquire any oil,
gas, or mineral lease or leases. The area outlined in Exhibit C attached to the
original executed copy of the Purchase Agreement includes territories in the
Gulf of Mexico adjacent to both the states of Texas and Louisiana, said
territories being within the areas indicated on Exhibit A to the Purchase
Agreement.

    By instrument dated April 30, 1951, hereinafter referred to as "Agency
Agreement," WRIGHT MORROW and ETHAN STROUD, Trustees for certain of the former
stockholders of PAN AMERICAN EXPLORATION COMPANY, a former Delaware Corporation,
then in dissolution, MARINE INSTRUMENT COMPANY, a co-partnership, W. L. MOODY,
III, and MEXICAN GULF SULPHUR COMPANY, a Delaware Corporation, entered into an
agreement for and on behalf of themselves and/or their assigns and the
beneficiaries of the trust above mentioned, their heirs at law, next of kin,
executors, administrators and/or assigns, as parties of the first part, with the
REPUBLIC NATIONAL BANK of DALLAS, as party of the second part, known as
Tidelands Royalty Agency "B," by the terms of which the Republic National Bank
of Dallas was designated Fiscal Agent for a period of five years from and after
April 30, 1951, to receive and distribute any proceeds of production payments
and overriding royalties which may accrue to Seller under the terms of the above
mentioned Purchase Agreement dated April 30, 1951.

    The rights, benefits and interests of the Seller in the Purchase Agreement
referred to above are characterized as "units" in Ex-

<PAGE>
                                       4

hibit D of the Purchase Agreement and in the aforementioned Agency Agreement,
the aggregate of such rights, benefits and interests being represented by
1,386,525 units. The present owners of such rights, benefits and interests are
herein referred to as "Unit Holders."

    Under the terms of the Purchase Agreement referred to above, the parties
named as Purchaser therein are authorized to charge each Unit Holder with the
reasonable cost and expense of making all conveyances of production payments and
overriding royalties at the end of the aforesaid five-year Agency Agreement. In
order to eliminate the duplication of cost which would result from separate
conveyances, if any, by Purchaser to each Unit Holder after April 30, 1956,
with each such conveyance being subject to the laws, rules, and regulations of
the political body having jurisdiction of the area covered by said conveyance
(which, by way of example, will include the laws of recordation, probate, and
taxation), each of the undersigned Unit Holders is of the opinion that the best
way for him to realize upon and liquidate his interest in the Purchase Agreement
is for him, together with all other Unit Holders who so desire, to transfer all
of his rights, benefits and interests in the Purchase Agreement to the Trustees
named herein or the Corportion hereinafter mentioned, to be managed and
liquidated in accordance with the terms of this Indenture.

    Each of the undersigned Unit Holders concurrently with the execution of this
Indenture is making a conveyance transferring, assigning and conveying to the
Trustees all interest of such undersigned Unit Holder in and to the Purchase
Agreement and in and to any and all production payments and overriding royalty
interests and any and all money, credit, and proceeds accruing thereto to which
such Unit Holder may now or at any time hereafter become entitled under the
Purchase Agreement insofar as it pertains to certain areas in the Gulf of Mexico
off the coast of Texas.

<PAGE>
                                       5

    Because counsel for the Unit Holders advise that the law of the State of
Louisiana provides that a trust may have a relatively short duration, and other
considerations, there has been created a Delaware corporation, known as
Tidelands Royalty "B" Corporation, to receive and hold title to Unit Holders'
rights under the Purchase Agreement insofar as they pertain to areas off the
coast of Louisiana. All of the capital stock of the Corporation has heretofore
been conveyed by its incorporators to the Trustees herein named. The undersigned
Unit Holders are conveying to the Corporation by conveyances made concurrently
with this Indenture all of the interest of such undersigned Unit Holders in and
to the Purchase Agreement and in and to any and all production payments and
overriding royalty interests and any and all money, credit and proceeds accruing
thereto which such Unit Holders may now or at any time hereafter become entitled
under the Purchase Agreement insofar as it pertains to certain areas in the Gulf
of Mexico off the coast of Louisiana. Each of the undersigned Unit Holders and
Tidelands Royalty "B" Corporation are making an agreement concurrently herewith
under which, among other things, the Corporation agrees to pay said Unit Holder
ninety-five one hundredths (95/100ths) of all income that the Corporation may
receive from and under such rights so conveyed to it by the Unit Holder. Each of
the undersigned Unit Holders by assignment made concurrently herewith is
transferring to the Trustees all of his rights under his said contract with the
Corporation.

    Now, THEREFORE, in consideration of the premises, and to evidence the terms,
conditions and trusts upon which the Trustees hold the rights and interests
conveyed to them by the Unit Holders and the capital stock of the Corporation as
aforesaid, it is agreed as follows:

<PAGE>
                                       6

                                    ARTICLE I
                                   DEFINITIONS

    The terms defined in this Article I shall, for all purposes of this
Indenture, have the respective meanings stated herein, unless the context
otherwise connotes.

     1. "Indenture" shall mean this instrument.

     2. "Trust Estate" shall mean (a) all rights to any and all of the
production payments and overriding royalty interests in oil, gas, and other
minerals to which Seller may become entitled under the terms of the Purchase
Agreement, insofar as and to the extent that Unit Holders have conveyed such
rights to the Trustees together with all monies and other property in the hands
of the Trustees representing the proceeds of oil, gas, or other minerals
accruing to such production payments and overriding royalty interests, (b) all
of the capital stock of Tidelands Royalty "B" Corporation and stockholders'
rights thereunder, (c) all rights of Unit Holders under their contracts with
Tidelands Royalty "B" Corporation, and (d) all monies and other property in the
hands of the Trustees accruing to the Trustees by virtue of their ownership of
the property comprising the Trust Estate.

     3. "Corporate Trustee" shall mean the Republic National Bank of Dallas,
Texas, and its successors as from time to time constituted or appointed
hereunder.

     4. "Individual Trustee" shall mean L. C. Paslay of Dallas, Texas, and his
successors as from time to time constituted or appointed hereunder.

     5. "Trustees" shall mean the then acting Corporate Trustee and Individual
Trustee, and "Trustee" shall mean either the Corporate or Individual Trustee.

     6. "Certificate" shall mean a certificate of beneficial interest for one or
more shares issued under this Indenture as hereinafter provided.

<PAGE>
                                       7

     7. "Transfer Agent" shall mean the person, firm or corporation appointed,
as herein provided, as Transfer Agent to countersign, transfer, register and
deliver Certificates.

     8. "Holder" or "Certificate Holder" shall mean the registered owner of a
Certificate as shown by the registration books maintained by the Transfer Agent
at the time in question.

     9. "Distribution Date" shall mean the close of business on March 31 and
September 30 of each year in which any funds become available for distribution
by the Corporate Trustee as hereinafter provided.

     10. "Seller" shall mean the parties referred to as Seller in the Purchase
Agreement of April 30, 1951, attached hereto as Appendix 1.

     11. "Purchaser" shall mean the party or parties referred to as Purchaser in
the Purchase Agreement of April 30, 1951, attached hereto as Appendix 1.

     12. "Corporation" shall mean Tidelands Royalty "B" Corporation, a Delaware
Corporation.

     13. Words denoting one gender include other genders; the singular includes
the plural, and the plural includes the singular.

                                   ARTICLE II

                            PURPOSE OF THIS INDENTURE

     The purpose of this Indenture is to provide an efficient, orderly and
practical means by which the Sellers under the Purchase Agreement may liquidate
their interest in the Trust Estate. It is not the purpose of the parties hereto
to create, and nothing in this Indenture shall be construed as creating, a
partnership, joint venture or business association between or among Certificate
Holders hereunder, present or future.

<PAGE>

                                   ARTICLE III

                   TITLE, POWERS AND FUNCTIONS OF THE TRUSTEES

    SECTION 1. The Trustees shall jointly take and hold full title, both legal
and equitable, to all property at any time included in the Trust Estate, IN
TRUST, HOWEVER, to be administered and disposed of by them in accordance with
the terms of this Indenture for the benefit of the Certificate Holders hereunder
in proportion to the respective interests of such Holders as represented by said
outstanding Certificates.

    SECTION 2. The Corporate Trustee shall have the following specific powers
and all other powers hereinbefore or hereinafter by this Indenture conferred
upon the Corporate Trustee:

          (a) The Corporate Trustee shall receive and accept any and all
     conveyances of, and hold title jointly with the Individual Trustee, in its
     name and in the name of the Individual Trustee as Trustees to, any
     production payments and overriding royalties which Purchaser is obligated
     to convey to Seller under the terms and provisions of the Purchase
     Agreement.

          (b) The Corporate Trustee is authorized and empowered to collect and
     receive and give receipts and acquittances for all monies accruing at any
     time to the Trust Estate.

          (c). The Corporate Trustee is authorized and empowered to make,
     execute and deliver any and all division orders, transfer orders, sales
     contracts and other sales arrangements for oil, gas or other minerals which
     it may deem proper or which may be required by any purchaser of any oil,
     gas or other mineral accruing to any production payment or overriding
     royalty or contract right or interest therein which may at any time be a
     part of the Trust Estate.

          (d) The Corporate Trustee is authorized and empowered in its
     discretion, subject to the provisions of Section 4 of this Article III, to
     do any and all things necessary or appropriate to preserve, uphold and
     defend the Trust Estate and the rights, powers, acts and omissions of the
     parties hereto as fully as individuals might do, including without
     limitation the power to institute, contest,

<PAGE>
                                       9

     arbitrate, compromise, waive, release or abandon any action, proceeding,
     claim, demand or right.

          (e) The Corporate Trustee shall have the power to execute and deliver,
     or cause to be executed and delivered, powers of attorney, contracts,
     pooling and unitization agreements, options or other instruments which it
     may deem necessary or proper in the execution of its powers hereunder.

          (f) The Corporate Trustee is authorized to pay out of available funds
     of the Trust Estate such taxes assessed against the Trust Estate or against
     either of the Trustees hereunder, the charges herein authorized to be made
     by the Trustees, and such other costs, expenses, debts, claims, liabilities
     and obligations incurred in connection with the Trust Estate or with which
     the Trust Estate or either Trustee may be charged, as it may deem necessary
     and proper and upon evidence by it deemed sufficient.

          (g) The Corporate Trustee shall hold any monies that may form a part
     of the Trust Estate subject to the provisions of this Indenture.

          (h) The Corporate Trustee is empowered, authorized and directed to
     distribute to the Certificate Holders monies constituting a part of the
     Trust Estate in the manner and to the extent hereinafter provided in this
     Indenture.

          (i) The Corporate Trustee shall have the authority to attend all
     meetings of stockholders of the Corporation and at such meetings to vote,
     in person or by proxy, all of the capital stock of said Corporation for all
     purposes including the election of directors.

          (j) The Corporate Trustee, when so directed by the Holders of a
     majority in interest of the then outstanding shares of beneficial interests
     in this Trust at a meeting thereof, shall vote the shares of stock in the
     Corporation in favor of the dissolution of the Corporation and shall cause
     its properties to be conveyed to the Trustees directly as a part of the
     Trust Estate free and clear of the contract referred to in the Preamble of
     this Indenture.

          (k) The Corporate Trustee upon termination of this trust is authorized
     and directed, jointly with the Individual Trustee, to distribute among the
     Certificate Holders all of the remaining assets and property of the Trust
     Estate in the manner hereinafter provided in this Indenture.

          (1) The Corporate Trustee shall have such further and additional
     powers and is authorized to do and perform such additional

<PAGE>
                                       10

    acts of any kind and character which it may deem necessary or expedient for
    the proper exercise of any of the powers conferred upon it by this
    Indenture.

    SECTION 3. The Individual Trustee shall have the following specific powers
and all other powers hereinbefore or hereinafter by this Indenture conferred
upon the Individual Trustee:

          (a) The Individual Trustee shall receive and accept any and all
     conveyances of, and hold title jointly with the Corporate Trustee, in his
     name and in the name of Corporate Trustee as Trustees to, any production
     payments and overriding royalties which Purchaser is obligated to convey to
     Seller under the terms and provisions of the Purchase Agreement.

          (b) The Individual Trustee is empowered and directed to prepare,
     execute, issue and deliver, as the issuer thereof, Certificates of
     beneficial interest in this Trust as hereinafter provided.

          (c) The Individual Trustee is empowered and directed to appoint the
     Transfer Agent, who shall be acceptable to the Corporate Trustee.

          (d) The Individual Trustee, with the written consent and approval of
     the Corporate Trustee, is authorized to borrow money for the Trust from
     banks, Certificate Holders and any other persons (the proceeds of which
     shall be turned over to the Corporate Trustee) as shall be deemed necessary
     to pay any taxes assessed against the Trust Estate or either Trustee
     hereunder, and any other charges, costs, expenses, debts, liabilities and
     obligations in connection with the Trust Estate or with which the Trust
     Estate or either Trustee may be charged or which may be necessary to
     protect, conserve, or defend the Trust Estate, including the property of
     the Corporation; and in connection with such borrowing, to pledge or
     mortgage all or so much of the Trust Estate as may be necessary to secure
     the same, executing and delivering any and all evidences of indebtedness
     and instruments of pledge or mortgage necessary to obtain and secure the
     borrowing.

          (e) The Individual Trustee is solely empowered, authorized, and
     directed to exercise on behalf of the Trust the right reserved by Sellers
     in Article VI of the Purchase Agreement to examine Exhibit C to the
     Purchase Agreement and other data and records of the Purchaser, to
     ascertain whether the Purchaser is

<PAGE>
                                       11

     fulfilling and complying with the terms of the Purchase Agreement.

          (f) The Individual Trustee shall have such further and additional
     powers and is authorized to do and perform such additional acts of any kind
     and character which he may deem necessary or expedient for the proper
     exercise of any of the powers conferred upon him by this Indenture.

     SECTION 4. It shall be the responsibility and duty solely of the Individual
Trustee to determine whether Purchaser is fulfilling its obligations under and
complying with the provisions of the Purchase Agreement, including the
obligation to convey from time to time certain production payments and
overriding royalty interests required to be conveyed by the Purchaser or its
assigns to the Sellers or their assigns under the Purchase Agreement, and the
obligation to pay and deliver from time to time all monies accruing to such
interests; and in this connection the Individual Trustee is authorized and
empowered to institute, contest, arbitrate, compromise, waive, release, or
abandon any action, proceeding, claim, demand or right necessary or appropriate
for the enforcement of the rights of Sellers under or arising from the Purchase
Agreement.

     SECTION 5. The Trustees are authorized to employ and use the services of
employees, agents, counsel, independent contractors, geologists, engineers,
appraisers, auditors, accountants, experts, and other representatives, and,
except as to the power vested in the Individual Trustee in Section 3, paragraph
(e) of this Article, to delegate such of its or his powers and authority upon
any of such parties, as it or he may deem advisable or expedient.

     SECTION 6. With respect to the powers herein granted to or conferred upon a
particular Trustee, the other Trustee shall, without responsibility therefor, do
and perform all those acts and duties deemed by the Trustee to whom the power
has been granted to be necessary or appropriate to the full and complete
execution and performance of the granted power.

<PAGE>

                                       lb

     SECTION 7. In the event any of the powers enumerated in this Indenture
should be held invalid by a final judgment of a court with jurisdiction in the
premises, the invalidity of any such power shall not affect any other power of
the Corporate or Individual Trustee here under.

     SECTION 8. The Trustees, in the performance of their duties hereunder,
shall not have the power or authority

          (a) To engage in their capacities as Trustees hereunder in any trade
     or business.

          (b) To invest or reinvest any monies forming a part of the Trust
     Estate, or to use any of such monies for any purpose other than a purpose
     authorized herein.

          (c) To acquire in their capacities as Trustees hereunder any oil, gas
     or other mineral interests other than those to which the Seller may be
     entitled under the Purchase Agreement or upon dissolution of Tidelands
     Royalty "B" Corporation as herein provided, or to acquire any other
     property whatsoever except such stationery, office supplies and equipment
     as the Trustees may need to keep the records of and administer this Trust.

          (d) To sell or dispose of any of the production payments or overriding
     royalty interests to which the Seller may be entitled under the Purchase
     Agreement, except as hereinafter provided upon termination of this Trust
     and as may be necessary to pledge or mortgage such payments or interests
     for the limited purposes set forth in Section 3, paragraph (d) of this
     Article III.

     SECTION 9. The Trustees, as assignees of the rights of the Unit Holders
under the above mentioned contracts between the Unit Holders and Tidelands
Royalty "B" Corporation, shall carry out and perform the obligations of the Unit
Holders thereunder. As the voting stockholder of all of the stock of that
Corporation, the Corporate Trustee shall not allow that Corporation to own any
property other than the rights conveyed to it concurrently herewith by the Unit
Holders and any properties which may hereafter be conveyed to it directly or
indirectly under the Purchase Agreement, and the Corpo-

<PAGE>
                                       13

rate Trustee shall not allow that Corporation to engage in any trade or business
except the ownership and management of said rights and properties.

     SECTION 10. No party paying money to the Trustees shall be bound to see to
the application of any money paid to the Trustees.

     SECTION 11. Each Trustee, either individually or in any representative or
fiduciary capacity except as Trustee hereunder, may acquire, own, and dispose of
Certificates to the same extent as if it or he were not a Trustee hereunder.

                                   ARTICLE IV
                       CERTIFICATES OF BENEFICIAL INTEREST

     SECTION 1. Each of the undersigned Unit Holders covenants that the
conveyances to the Trustees and the Corporation made by such Unit Holder
concurrently herewith are effective to convey all of the interest of such Unit
Holder in the rights of the Seller under the Purchase Agreement, and that the
number of units described in such conveyances is the exact number of units owned
by such Unit Holder and may be relied upon by the Individual Trustee in issuing
Certificates of beneficial interest to such Unit Holder as hereinafter provided.
It is understood that the names of all Unit Holders who execute this Indenture
do not appear on the list of Unit Holders listed in Exhibit D attached to the
Purchase Agreement for the reason that some of the original Unit Holders have
transferred all or portions of their interests to others; and all such transfers
by Unit Holders as are shown on the records of Republic National Bank of Dallas
are hereby ratified and confirmed by the respective transferors as being valid
and effective to transfer to the transferee thereof that proportionate part of
the interest of the Seller under the Purchase Agreement and of the right to
receive conveyances of interest in production payments and overriding royalty
interests and moneys accruing thereto as

<PAGE>
                                       14

provided in said Purchase Agreement that the number of units described in such
transfer bears to the total number of units existing under the Purchase
Agreement.

     SECTION 2. The Individual Trustee, through the Transfer Agent, shall
forthwith issue to each Unit Holder a Certificate, in the form set forth as
Appendix 2 hereto, for the number of shares of beneficial interest in this Trust
equal to the aggregate number of "units" which concurrently herewith said Unit
Holder has conveyed to the Trustees. Upon the initial issue of Certificates
hereunder, the Transfer Agent shall register and record the Certificates issued
and the names and addresses of the Holders to whom issued. Thereafter the
Transfer Agent shall maintain the official register of Certificate Holders which
shall evidence the record ownership of outstanding Certificates.

     SECTION 3. Each Unit Holder who executes this Indenture, as a Certificate
Holder, shall be entitled, from and after the effective date of this Trust or
the date of the Trustees' execution of the Unit Holder's particular counterpart
of this Indenture, whichever is later, to participate according to the number of
his shares in the rights and benefits of the Certificate Holders under this
Indenture, and he shall be entitled to all the benefits of all of the Trust
Estate and the proceeds thereof in accordance with his respective interests in
this Trust, in the proportion that the number of shares owned by such
CERTIFICATE HOLDER bears to the total number of shares outstanding under this
INDENTURE. Each Holder or transferee of any such Certificate by assignment or
otherwise takes and holds the same subject to all the terms and provisions of
this Indenture. By an assignment or transfer of any such Certificate, the
transferor thereby shall part with all his rights (to the extent of the
transferred shares) in, to, and under such Certificate and in and to the Trust
Estate as well as all rights under this Indenture as against all other
Certificate Holders and the Trustees. Said Certificates

<PAGE>
                                       15

and the rights and benefits evidenced thereby are and shall be held and
construed to be in all respects personal property, and shall in no wise pass to
or vest in any owner or holder thereof or his heirs, devisees or assignees
thereof as real estate; and said Certificates shall be bequeathed, assigned,
disposed of and distributed as personal estate. No Certificate Holder, as such,
shall have any title, either legal or equitable, in or to any interest in the
production payments or overriding royalty interests or other assets at any time
forming a part of the Trust Estate, or in any oil, gas or other mineral accruing
thereto; but the sole interest of each Certificate Holder during the existence
of this Trust, shall be the right to receive his proportionate part of the net
proceeds in the form of money in the hands of the Corporate Trustee which under
this Indenture such Certificate Holder is entitled to receive, and upon
termination of this Trust to receive conveyances or assignments of his share of
the property then constituting the Trust Estate, as herein provided. No
Certificate Holder shall have the right to call for or demand or secure any
partition during the continuance of the Trust hereby created.

     SECTION 4. All Certificates shall be issued and signed by the Individual
Trustee and countersigned by the Transfer Agent. The signature of the Individual
Trustee may be facsimile in form. In case the Individual Trustee whose signature
may appear upon any of the Certificates shall cease to be the Individual Trustee
before such Certificates so signed shall have been authenticated or delivered by
the Transfer Agent, such Certificates, upon such authentication, delivery and
issue, shall be valid and effective for all purposes as though the Individual
Trustee who signed the same had continued to be the Individual Trustee.
Certificates may be signed by or bear the signature of the Individual Trustee by
such person who at the actual date of the signing of such Certificates shall be
the Individual Trustee, although at the nominal date of such Certificates such
person shall not be the Individual Trustee.

<PAGE>
                                       16

     SECTION 5. Certificates shall be transferable only on the records of the
Transfer Agent upon the surrender of such Certificates duly endorsed with
signature guaranteed by a bank or trust company satisfactory to such Transfer
Agent and payment of any transfer charges of the Transfer Agent, and the date
such transfer is actually entered by the Transfer Agent on its official records
shall be the effective date of transfer, regardless of any prior date of
execution. The Corporate Trustee may treat the owner of any Certificate as shown
by the Transfer Agent's records as the owner thereof and shall not be charged
with notice of any claim or demand to such Certificate or the interest
represented thereby by any other party. Any such transfer of a Certificate shall
transfer to the transferee as of the effective date of transfer all right, title
and interest of the transferor in and to the Trust Estate and all parts thereof
and all funds therein, either received or receivable, to which transferor might
be entitled under the transferred Certificate. A transfer of a Certificate
bearing an execution date which is on or prior to, but which is transferred by
the Transfer Agent after a Distribution Date as herein defined, shall not be
effective, as to the Transfer Agent or Trustees, to transfer to the transferee
the right of the transferor to any sum payable to him as the Certificate Holder
of record at the close of business on such Distribution Date, and the Corporate
Trustee may pay any such sum to the TRANSFEROR without liability to the
transferee, whose rights, if any, to recover said sum shall be solely against
the transferor. As to matters affecting the title, ownership, warranty or
transferability of Certificates, the Uniform Stock Transfer Act as adopted and
then in force in the state of Texas shall govern, except as otherwise herein
specifically provided. The death of the Certificate Holder shall not entitle the
legal representatives, heirs or assigns of such deceased Certificate Holder to
any accounting or valuation for any purpose, but such representatives shall
succeed to all rights of the deceased Certificate Holder under this Indenture
upon proper proof of title, satisfactory to the

<PAGE>
                                       17

Transfer Agent. The Individual Trustee and Transfer Agent shall never be
required to issue a Certificate covering any fractional share.

     For the transfer or reissuance of shares the Transfer Agent may charge the
transferee the fee established, as hereinafter provided, for each Certificate to
be issued to the transferee as a result of the transfer and a like charge to the
transferor for each Certificate to be reissued to the transferor. The Transfer
Agent shall be entitled to withhold transfer and delivery of Certificates, and
the Corporate Trustee shall be entitled to withhold distributions to any such
Certificate Holder, until such fees, as well as any stamp taxes then required
with respect to the issuance or transfer of such Certificates, have been paid.

     SECTION 6. If any Certificate should become lost, destroyed, or mutilated,
the Transfer Agent, in the discretion of, and upon proof satisfactory to the
Transfer Agent, together with a surety bond sufficient in the opinion of the
Transfer Agent, to indemnify the Trustees and the Transfer Agent against all
loss or expenses in the premises, and surrender of any mutilated Certificate,
may issue a new Certificate to the Holder of such lost, destroyed or mutilated
Certificate as shown by the records of the Transfer Agent, upon payment of a
reasonable charge of the Transfer Agent, and any reasonable expense incurred by
it or the Trustees in connection therewith.

     SECTION 7. In the event of any disagreement between the transferees,
assignees, heirs, legal representatives, legatees, or other claimants succeeding
to or claiming all or any part of the interest of any Certificate Holder,
resulting in adverse claims or demands being made in connection with such
interest, the Trustees and Transfer Agent shall be entitled at the option of any
of them to refuse to comply with any such claims or demands, so long as such
disagreements shall continue. In so refusing, the Trustees and Transfer Agent
may elect to make no delivery or other disposition of the interest represented
by the Certificate involved, or any part thereof, or of any sum or sums of money

<PAGE>
                                       18

accrued or accruing thereunder, and, in so doing, the Trustees and Transfer
Agent shall not be or become liable to any of said parties or anyone whomsoever
for their failure or refusal to comply with such conflicting or adverse claims
or demands, and they shall be entitled to continue so to refrain and refuse so
to act, until

     (a) The rights of the adverse claimants have been adjudicated by a final
judgment of a court assuming and having jurisdiction of the parties and the
interest and money involved, and a certified copy of such final judgment has
been furnished to the Trustees and Transfer Agent; or

     (b) All differences have been adjusted by valid agreement between said
parties, and the Trustees and Transfer Agent shall have been notified thereof in
writing signed by all of the interested parties.

     Upon distribution of any monies so withheld by reason of conflicting or
adverse claims or demands the Trustees may deduct therefrom the amount of all
expenses, including taxes, they or either of them shall have incurred as a
result of withholding such distribution pending adjudication or settlement of
such conflicting or adverse claims or demands.

     SECTION 8. The Transfer Agent, acceptable to the Corporate Trustee, shall
be designated and appointed by the Individual Trustee. The terms and conditions
under which the Transfer Agent shall serve in such capacity, together with the
compensation, transfer fees, and other charges of the Transfer Agent shall be
established from time to time by agreement, consistent with the terms of this
Indenture, between the Transfer Agent and the Individual Trustee, with the
approval of the Corporate Trustee. The Transfer Agent may be discharged by the
Individual Trustee with the approval of the Corporate Trustee. In the event of
the resignation, discharge, failure, refusal or inability to serve of the
Transfer Agent, a successor Transfer Agent shall be designated and appointed in
like manner.

<PAGE>
                                       19

                                   ARTICLE V

                             LIABILITY OF TRUSTEES

     SECTION 1. The Trustees, both Corporate and Individual, shall not be liable
to any Unit Holder, Certificate Holder or to any other person whomsoever for any
loss, damage, claim, demand or liability arising out of or in any way connected
with this Trust or resulting from any act or omission of the Trustees in
connection herewith, or for any error of judgment made in good faith; nor shall
the Trustees be liable for the acts or omissions of any agent, employee or
representative elected or appointed by or acting for said Trustee, including
officers, directors, agents and employees of Tidelands Royalty "B" Corporation.
In no event shall either Trustee be liable to anyone except for its or his own
wilful misconduct or failure to account properly for funds and property actually
received.

     SECTION 2. No officer or director of Tidelands Royalty "B" Corporation, who
is or was at the time in question also an officer or employee of the Corporate
Trustee, shall be liable to any Unit Holder, Certificate Holder, Stockholder or
Individual Trustee, nor to any other person whomsoever for any loss, damage,
claim, demand or liability arising out of or any way connected with the
management and administration of the affairs of the Corporation, or for any act
or omission of such officers and directors in connection therewith, nor for any
error of judgment made in good faith; nor shall such officers and directors be
liable for the acts or omissions of any agent, employee or representative of the
Corporation. In no event shall any such officer or director be liable to anyone
except for his own wilful misconduct or failure to account properly for funds
and property actually received.

     SECTION 3. All debts, obligations, claims, demands, liabilities and causes
of action of every character asserted by any person whomso-

<PAGE>
                                       20

ever with respect to the Trust Estate or any act or omission of the Trustees
shall, if established, be satisfied out of the Trust Estate and under no
circumstances shall be the personal obligation of the Trustees. If any liability
should be asserted against the Trustees, or either of them, or against any
Certificate Holder as a transferor of property conveyed to the Trustees or the
Corporation, the Corporate Trustee may use such part of the Trust Estate as may
be necessary in contesting any such liability and in payment thereof. The
Corporate Trustee may take such action and incur such expenses as it may in its
uncontrolled discretion deem advisable in connection with any such claim and
likewise may effectuate a compromise thereof.

     SECTION 4. In no event shall either of the Trustees be obligated to take
any action as a Trustee hereunder which in its or his opinion might subject the
Trustee to any expense or liability whatsoever unless, in the opinion of such
Trustee, sufficient funds or property, available for reimbursement and
indemnification of such Trustee, are present in the Trust Estate to reimburse or
indemnify such Trustee; but neither the presence in the Trust Estate of such
funds or property, nor the furnishing of same, shall obligate the Trustees or
either of them to take any action which it or he may deem improper under this
Indenture. No bond shall ever be required of the Trustees or either of them.

     SECTION 5. Each Trustee may, but shall not be required to, consult with
counsel (who may be its or his own counsel), accountants, geologists, engineers
and other parties deemed by such Trustee to be qualified as experts on the
matters submitted to them, and the opinion of any such parties on any matter
submitted to them by such Trustee shall be full and complete authorization and
protection to the Trustees, and neither Trustee shall be liable to any person
for any act taken, suffered or refused by it or him hereunder in good faith and
in accordance with the opinion of any such party.

<PAGE>
                                       21

                                   ARTICLE VI

                        METHOD OF SUCCESSION OF TRUSTEES

     SECTION 1. The Corporate Trustee may resign at any time by written notice
to each of the then Certificate Holders, given by mail addressed to each such
Holder at his last known. post office address as shown by the records of the
Transfer Agent at the time such notice is given. Such notice shall be duly
acknowledged in the forms required under the laws of Texas and Louisiana and any
Federal law or regulation for the acknowledgment of deeds, and shall specify a
date when such resignation shall take effect, which shall be a business day not
less than sixty (60) days from the date such notice is mailed. In such notice
the Corporate Trustee shall in the manner prescribed in Section 6 of this
Article VI, call a meeting of the Certificate Holders for the purpose of
selecting a successor Corporate Trustee. The resignation of the Corporate
Trustee shall be effective on such specified date regardless of whether or not a
successor Corporate Trustee has then been appointed.

     SECTION 2. The Individual Trustee may resign at any time by written notice
to each of the then Certificate Holders, given by mail addressed to such Holder
at his last known post office address as shown by the records of the Transfer
Agent at the time such notice is given. Such notice shall be duly acknowledged
in the forms required under the laws of Texas and Louisiana and any Federal law
or regulation for the acknowledgment of deeds, and shall specify a date when
such resignation shall take effect, which shall be a business day not less than
sixty (60) days from the date such notice is mailed. In such notice the
Individual Trustee shall state the name of the person to become the successor
Individual Trustee as hereinafter provided in Section 5 of this Article VI. In
the event the successor Individual Trustee as provided in Section 5 of this
Article VI is dead or has indicated his refusal or inability to serve, the
retiring Individual Trustee shall,

<PAGE>
                                       22

in the manner prescribed in Section 6 of this Article VI, call a meeting of the
Certificate Holders for the purpose of selecting a successor Individual Trustee.
The resignation of the Individual Trustee shall be effective on such specified
date regardless of whether or not a successor Individual Trustee has then been
appointed.

     SECTION 3. At any meeting of the Certificate Holders called for the
purpose, either Trustee may be removed by the affirmative vote of Certificate
Holders owning a majority in interest of the then outstanding shares. A Trustee
so removed shall forthwith be paid any and all compensation, fees, expenses, and
other sums of money to which it or he may then be entitled.

     SECTION 4. In the event of a vacancy in the position of either Trustee or
in the event a Trustee in its or his resignation has designated a date in the
future at which such resignation shall become effective, the Certificate Holders
owning a majority in interest of the shares then outstanding may, at a meeting
of the Certificate Holders, appoint a successor Trustee, subject to the special
provisions for successor Individual Trustee in Section 5 of this Article VI. Any
successor Corporate Trustee shall be a bank or trust company having its
principal office in the State of Texas or elsewhere and having an unimpaired
capital and surplus of not less than Three Million Dollars ($3,000,000.00). Any
successor Individual Trustee shall be a person satisfactory to the Purchaser for
the purpose of examining Exhibit C to the Purchase Agreement. In the event a
vacancy in the position of either Trustee continues for sixty (60) days, a
successor Trustee may be appointed by the Senior Judge of the United States
District Court for the Northern District of Texas, Dallas Division (if he fails
or refuses to act; then by the Senior Judge of the District Courts of Dallas
County, Texas), upon the application of the other Trustee, the resigned Trustee,
or any Certificate Holder; and in the event any such application is filed, such
court may appoint, at any time thereafter, a temporary

<PAGE>
                                       23

Trustee having the qualifications specified in this Section, and such temporary
Trustee shall, pending the final appointment of a successor Trustee, have such
powers and duties as the court appointing such temporary Trustee shall provide
in its order of appointment, consistent with the provisions of this Indenture.

     Immediately upon the appointment of any successor Trustee, all rights,
titles, duties, power and authority of the retiring Trustee hereunder shall be
imposed upon, vested in and undertaken by the new Trustee, and the new Trustee,
upon delivering to the retiring Trustee adequate receipts, releases and
acquittances, shall be entitled to receive from the retiring Trustee all of the
Trust Estate held by it or him and all records and files in connection
therewith.

     SECTION 5. In the event of the death, resignation, removal, refusal or
inability to serve of L. C. Paslay, the Individual Trustee named in this
Indenture, J. H. Pernell shall become and be successor Individual Trustee. In
the event of the death, resignation, removal, refusal or inability to serve of
J. H. Pernell as Individual Trustee, Charles G. McBurney shall become and be
successor Individual Trustee.

     SECTION 6. In cases where action may be taken by a meeting of the
Certificate Holders, as provided in this Indenture, such meeting may be called
by either Trustee or by Certificate Holders owning not less than ten per cent
(10%) in interest of the then outstanding shares. Such meeting shall be held
at such time and place in the State of Texas as may be designated in the notice
which shall state the business to be transacted at said meeting, and no other
business than that stated in the notice shall be transacted at said meeting.
Such meeting shall not be held until the expiration of twenty days from the
deposit of a copy of said notice in the United States mail properly addressed
and postage prepaid, to each Certificate Holder at his last known post office
address as shown by the records of the Transfer Agent. At any such meeting each
Certificate

<PAGE>
                                       24

Holder may be present and vote either in person or by proxy. A written statement
executed and duly acknowledged, in the form required by the laws of Texas and
Louisiana and any Federal law or regulation for acknowledgment of deeds, by an
authorized officer of the Corporate Trustee (or if it has resigned, by the
Individual Trustee) setting forth the facts concerning the calling of any such
meeting, the giving of the notice thereof and of the action taken at said
meeting, including the total number of shares represented by all outstanding
Certificates, the number of shares present at such meeting, and the number of
shares taking such action, and filed in the records of any county or agency
having jurisdiction over any part of the Trust Estate, shall be conclusive as to
all facts recited in said statement, and all parties dealing with the Trust
Estate or any part thereof shall be protected in acting in reliance upon any
such statement. In the event both Trustees have resigned and no successor
Trustee has been appointed at the time of such meeting, the statement of action
taken at the meeting of Certificate Holders shall be made by an authorized
officer of the resigned Corporate Trustee and shall have the same force and
effect as if such resigned Corporate Trustee were still serving in the capacity
of Corporate Trustee hereunder.

     Whenever the vote of Certificate Holders at a meeting thereof is required
or permitted by any provision of this Indenture to be taken in connection with
any action hereunder, the meeting and vote of Certificate Holders may be
dispensed with, if at least the same number or percentage of Certificate Holders
who would have been entitled to take or authorize such action upon a vote
thereon if such meeting were held, shall consent in writing to such action being
taken.

     Nothing in this Section 6 or any other provision of this INDENTURE shall be
deemed to give Certificate Holders, individually or collectively, any power or
right of control over the Trust Estate or the Trustees and their respective
rights, duties, powers and activities hereunder, except

<PAGE>
                                       25

as may result from the removal of either Trustee, the appointment of successor
Trustee, the extension or termination of this Trust, or the amendment of this
Indenture, and as may result from authorization to the Corporate Trustee to
dissolve Tidelands Royalty "B" Corporation, or to the Trustees to organize and
create one or more corporations to hold and administer property comprising the
Trust Estate.

                                   ARTICLE VII

                    ACCOUNTING FOR PROCEEDS OF TRUST ESTATE

     SECTION 1. The Corporate Trustee may and shall use so much of all money
received by it as may be necessary to pay all liabilities and obligations
incurred by either of the Trustees in connection with this Trust, including but
without limiting the generality of the foregoing, all expenses (including all
expenses of establishing this Trust and the Corporation), taxes, liabilities
incurred of all kinds, compensation to the Corporate Trustee for its services
hereunder, and compensation to such parties as may be employed or used by the
Trustees under Article III, Section 5 hereof.

     SECTION 2. During the months of April and October of each year the
Corporate Trustee shall make distributions to the Certificate Holders pro rata
of the cash in the Trust Estate available for distribution as of the close of
business on March 31 and September 30 preceding, as the case may be, such
payment to be made to the Certificate Holders of record on the records of the
Transfer Agent at the close of business on such preceding distribution date. As
soon as practicable following March 31 and September 30 of each year, the
Transfer Agent shall deliver to the Corporate Trustee a report containing the
names and addresses of the Certificate Holders of record at the close of
business on such preceding distribution date, indicating opposite each

<PAGE>
                                       26

name the number of shares owned of record by such Holder. The report of the
Transfer Agent shall also state the number of shares the ownership of which is
in disagreement or in doubt, and the number of shares upon which transfer fees
or taxes are due but unpaid. In making distribution as herein provided, the
Corporate Trustee may rely solely and finally upon such report of the Transfer
Agent. The Corporate Trustee shall distribute all cash on hand in the Trust
Estate as of such distribution date, less such amount of money as the Corporate
Trustee may, in its uncontrolled discretion, determine should be reserved for
the payment of accrued liabilities and of expenses and liabilities not then
accrued and for liabilities and expenses and other cash requirements of the
Trust Estate expected to arise during the succeeding six months for which a cash
reserve should in the uncontrolled discretion of the Corporate Trustee be
established, and less such amounts of money as the Corporate Trustee is
authorized to withhold under Sections 5, 6 and 7 of Article IV of this
Indenture. The said payments shall be made by the Corporate Trustee's mailing to
the Certificate Holders checks drawn on the bank in which Trust funds are
deposited for the amounts to be paid to each Certificate Holder, and with each
such check the Corporate Trustee shall send to each Certificate Holder a
statement showing in summary form the receipts and disbursements of the
Corporate Trustee during the period since the last distribution date.

     As soon as practicable after the close of each calendar year, the Corporate
Trustee shall mail to each party to whom it shall have made any disbursements or
payments during the preceding calendar year a statement of the amount of taxable
income, as reflected by the Corporate Trustee's fiduciary income tax return,
that such party has received during the preceding calendar year on account of
all payments made to him by the Corporate Trustee during such year.

<PAGE>
                                       27

    SECTION 3. On the effective date of this Trust, certain Unit Holders
signatory to this Indenture (perhaps including the Individual Trustee), will
advance to the Trust, by depositing with the Corporate Trustee, the sum of Three
Thousand Five Hundred Dollars ($3,500.00), to cover estimated compensation and
expenses of the Trustees prior to such time as proceeds of the Trust Estate are
received by the Corporate Trustee. If such sum advanced is insufficient, it may
from time to time be supplemented by the same or other Unit Holders or
Certificate Holders. Such advances shall be treated as liabilities of the Trust.
As soon as the Corporate Trustee receives monies from proceeds of the Trust
Estate sufficient to do so, taking into account then current expenses and other
liabilities of the Trustees, the Corporate Trustee shall reimburse such
contributing Unit Holders or Certificate Holders the amount each has so
advanced, before any distribution of net proceeds is made to Certificate Holders
under Section 2 of this Article VII.

                                  ARTICLE VIII

         INDEMNIFICATION, REIMBURSEMENT AND COMPENSATION OF THE TRUSTEES

     SECTION 1. Each Trustee shall be indemnified by, and receive reimbursement
from the Trust Estate against and from any and all liability, claims, damages or
loss incurred by it or him in the administration of the Trust Estate or any part
thereof, or in the doing of any act of omission or commission done or performed
by it or him as Trustee hereunder; and the Corporate Trustee and Individual
Trustee shall have respectively a first and second lien upon the Trust Estate to
secure them for such indemnification and reimbursement, as well as for the
compensation to be paid to the Corporate Trustee hereunder.

     SECTION 2. Both the Corporate Trustee and the Individual Trustee as well as
the Transfer Agent shall be protected, and shall not be liable to any one
whomsoever, in acting upon any notice, credential, certifi-

<PAGE>
                                       28

cate, assignment, transfer, or other document or instrument believed by them,
or any of them acting on same, to be genuine and to be signed by the proper
party or parties.

     SECTION 3. The Corporate Trustee shall receive the following compensation
for its services as Corporate Trustee hereunder:

<Table>
<Caption>
<S>                                                                                     <C>
Acceptance fee ......................................................................   $   1,000.00

Receiving, recording, and entering on Trust records all assignments or
    conveyances from the Purchaser-per instrument ...................................           5.00

Receiving, verifying, executing, and entering on Trust records all division
    orders, transfer orders, contracts, unitization agreements, and similar
    instruments-per instrument ......................................................           5.00

Receiving, checking, and entering on Trust records all remittances of all
    production and royalty payments from Purchaser-per remittance ...................           1.00

Preparing, recording, and mailing distribution checks to Certificate Holders-per
    check ...........................................................................            .50
</Table>

     In addition to the foregoing fees for specific services, the Corporate
Trustee shall receive reasonable and customary fees and compensation for other
services in connection with this Trust including, without limiting the
generality of the foregoing, the following:

     Preparation and filing fiduciary income tax returns and sending to
Certificate Holders statements of taxable income.

     Determination and payment of taxes, costs, expenses, claims, liabilities,
and obligations incurred in connection with the administration of the Trust
Estate and the activities of the Trustees hereunder.

     Attendance at meetings of Certificate Holders and preparation of statements
of action taken thereat.

     Attendance at stockholders' meetings of Tidelands Royalty "B" Corporation
and voting capital stock thereat.

     Services involved in termination, liquidation or conversion to a
corporation, of this Trust, or any part thereof, and termination of Tidelands
Royalty "B" Corporation.

<PAGE>
                                       29

     The minimum annual compensation of the Corporate Trustee, against which all
charges and fees (other than the acceptance fee) shall be credited, shall be
Five Hundred Dollars ($500.00). Upon request of the Corporate Trustee, the
compensation and fees provided in this Section 3 may be changed from time to
time by the affirmative vote of Certificate Holders owning a majority in
interest of the then outstanding shares taken at a meeting of Certificate
Holders in accordance with the provisions of ARTICLE VI, SECTION 6.

     SECTION 4. The Corporate Trustee shall pay out of the Trust Estate the
reasonable expenses incurred by the Individual Trustee in the performance of his
duties hereunder.

     SECTION 5. In the event of litigation involving the Trust Estate, audits,
or inspection of the records of the Trust Estate, pertaining to transactions
affecting the Trust Estate, or any other unusual or extraordinary services
rendered in connection with the administration of the Trust Estate, the Trustees
shall be entitled to receive, in addition to the regular compensation above
provided, reasonable compensation for such unusual services rendered, together
with reimbursement for their actual expenditures in connection therewith.

     SECTION 6. If either Trustee performs special services at the request and
for the benefit of an individual Certificate Holder, such Trustee shall be
entitled to receive from such Certificate Holder reasonable compensation
therefor; provided, however, that this sentence shall not obligate either
Trustee to perform any such special service.

                                   ARTICLE IX
                                  MISCELLANEOUS

     SECTION 1. Each Certificate Holder of record and his duly authorized
agents, attorneys and auditors shall have the right at reasonable intervals and
during reasonable business hours, to examine, inspect and make audits in respect
to the Trust Estate and the records

<PAGE>
                                       30

of the Trustees, the Transfer Agent and the Corporation in reference thereto;
provided, however, that the Trustees and the Corporation and their directors,
officers and employees shall not be required or obligated to divulge the name of
any oil company or other party which is or may become a Purchaser under the
Purchase Agreement or which at any time may make any payments or conveyances to
the Trustees or the Corporation.

     SECTION 2. Neither a change of name of the Corporate Trustee nor any
merger, consolidation or conversion into or with a state or national bank, shall
affect the Corporate Trustee's position as Corporate Trustee hereunder; and the
Corporate Trustee, under whatever name it may be known, and any corporation into
or with which it may be converted, merged or consolidated, shall exercise and
possess the rights, powers, privileges and immunities, and perform the duties
and obligations of, the Corporate Trustee hereunder.

     SECTION 3. Neither this Indenture nor any executed copy hereof need be
filed in any county, agency, registry or jurisdiction in which any of the Trust
Estate is located, but the same may be filed for record in any such county,
agency, registry or jurisdiction by either Trustee if it or he so elects. In
order to avoid the necessity of filing this Indenture for record, the Trustees
agree that for the purpose of vesting the record title in any successor Trustee,
the retiring Trustee will, upon appointment of any successor Trustee, execute
and deliver to such successor Trustee appropriate assignments or conveyances of
the Trust Estate, preserving and continuing the terms and provisions of the
original conveyances into this Trust, made concurrently herewith, referred to in
the Preamble of this Indenture, but without any warranty of title.

<PAGE>
                                       31

     SECTION 4. If in their judgment such action is necessary to the
preservation or enhancement of the Trust Estate, the Trustees are authorized and
empowered on behalf of Unit Holders and Certificate Holders to amend the
Purchase Agreement of April 30, 1951, under the circumstances and in the manner
hereinafter provided

     In the event the Purchase Agreement or any lease obtained by the Purchaser
which is subject to the Purchase Agreement should become subject to any state or
federal law or regulation which either

     (1) Limits the aggregate percentage of all royalties, overriding royalties,
or payments out of production, or

     (2) Provides that if the aggregate percentage of royalties, overriding
royalties, or payments out of production shall exceed a certain percentage the
same shall be deemed a violation of the lease unless the agreement creating the
overriding royalties or payments out of production expressly provides that such
overriding royalties or payments out of production shall be limited or suspended
when oil, gas or mineral production falls below a certain amount,

then, and only in such event, the Purchase Agreement may be modified and amended
to the extent necessary to conform to, and be valid under, such law or
regulation.

          In the event the Purchase Agreement of April 30, 1951, should be
     deemed to be subject to the rule of law known as the "Rule Against
     Perpetuities," then, and only in such event, the Purchase Agreement may be
     modified and amended to the extent necessary to conform to, and be valid
     under, such rule of law for the longest possible period of time.

     SECTION 5. Insofar as may be provided, it is hereby provided that this
Trust shall not be subject to the provisions of the Texas Trust Act as it may
now or hereafter be written. In all other respects, this Indenture shall be
deemed to be a contract made under, and shall be construed in accordance with,
the law of the State of Texas.

<PAGE>
                                       32

                                    ARTICLE X

                        DURATION AND TERMINATION OF TRUST

     SECTION 1. The Trust hereby created shall become effective June 1, 1954,
provided all of the events enumerated in Section 5 of this Article X have then
occurred, and shall continue until April 30, 2021, provided that:

          (a) The Holders of a majority in interest of the shares then
     outstanding may, by resolution adopted at a meeting of the Certificate
     Holders or by written consent, extend the term of this Trust for an
     additional period of not more than twenty (20) years each from the date
     said resolution is adopted or the date fixed in such written consent.

          (b) The Holders of a majority in interest of the shares then
     outstanding may, by a resolution adopted at a meeting of Certificate
     Holders or by written consent, authorize and direct the Trustees to
     organize and create one or more corporations (other than Tidelands Royalty
     "B" Corporation) to receive and hold title to the assets and property then
     comprising the Trust Estate, or any portion thereof, as the Certificate
     Holders shall authorize, and to administer the same in the place of the
     Trustees; provided, however, that there shall be no such action if any
     Certificate Holder shall in writing object to such action at a meeting of
     Certificate Holders, or if the Corporate Trustee shall receive written
     objection to such action from any Certificate Holder within twenty (20)
     days from the mailing to Certificate Holders of either notice of such
     meeting or request for such written consent, in the manner provided for
     notice of meetings in ARTICLE VI, SECTION 6. In the event such a
     corporation is organized:

               1. Such corporation shall be organized under the laws of and in
          such jurisdiction and with such powers as such Certificate Holders
          shall in such resolution or written consent authorize and approve.

               2. Each then outstanding Certificate Holder shall own an interest
          in such corporation in the same proportion as his share of beneficial
          interest under this Trust bears to all then outstanding shares of
          beneficial interest under this Trust. The shares of such corporation
          shall be distributed at the

<PAGE>
                                       33

time and in the manner prescribed in such resolution or written consent.

    3. The Trustees shall transfer and convey to such corporation such assets
and property then comprising the Trust Estate as such Certificate Holders shall
authorize and direct in said resolution or written consent; and such corporation
shall assume such outstanding debts, obligations and liabilities of the Trustees
and Trust Estate as such Certificate Holders shall authorize and direct in such
resolution or written consent.

Upon completion of the organization of such corporation, and the issuance of its
capital stock, and the transfer and conveyance to it of assets and properties of
the Trust Estate, and the assumption by it of debts, obligations, and
liabilities of the Trustees and the Trust Estate, all as above provided, this
Trust shall no longer apply and the Trustees shall be under no further liability
with respect to the property so conveyed to the corporation. If all of the
assets and properties of the Trust Estate are conveyed to such corporation or
corporations and all of the debts, obligations and liabilities of the Trustees
and Trust Estate are assumed by such corporation or corporations, this Trust
shall terminate and the Trustees shall be under no further liability whatever.

     (c) No amendment to this Indenture shall in any way change the nature of
this Trust from that of a purely ministerial trust. Subject to this limitation,
the Holders of eighty per cent (80%) in interest of the shares at any time
outstanding may, by resolution adopted at a meeting of Certificate Holders or by
written consent, amend this Indenture in such manner as shall be provided in
such resolution or written consent; provided, however, that there shall be no
change in the rights, duties or responsibilities of either Trustee without the
consent of such Trustee; and provided, further, that there shall be no change in
the purpose of this Trust or in the substantive rights of Certificate Holders if
any Certificate Holder shall in writing object to the amendment at such meeting
of Certificate Holders or if the Corporate Trustee shall receive written
objection from any Certificate Holder within twenty (20) days from the mailing
to Certificate Holders of either notice of such meeting or request for such
written CONSENT, IN THE MANNER provided for notice of meetings in Article VI,
Section 6.

     (d) The Holders of eighty per cent (80%) in interest of the shares at any
time outstanding may, by resolution adopted at a

<PAGE>
                                       34

meeting of Certificate Holders or by written consent, terminate this Trust at
such date as may be fixed in such resolution or written consent.

A certificate of the kind and character specified in Article VI, Section 6 of
this Indenture, reciting the action authorized and approved by the Certificate
Holders at such meeting or by written consent and filed for record in the
records of any county, agency, registry or jurisdiction where any part of the
Trust Estate may then be located shall be conclusive evidence of any such
termination or extension of the term of this Trust or the conversion of this
Trust, or any portion thereof, into a corporation. Upon termination of this
Trust by lapse of time or action of the Certificate Holders, a majority in
interest of the then outstanding Certificate Holders shall designate an Agent to
receive from Purchaser all subsequent conveyances and payments and to distribute
same among the persons entitled thereto.

    SECTION 2. Notwithstanding the duration and extension provisions of Section
1 of this Article X, or any other provision of this Indenture, this Trust shall
in any event terminate not later than twenty-one (21) years from and after the
death of the last survivor of all of the individual persons who as Unit Holders
execute this Indenture and establish this Trust and who are living at the
effective date of this Trust.

    In the event it should be finally determined by any court, tribunal, or
other authority having jurisdiction to so determine, that the immediately
foregoing paragraph of this Section 2 is invalid for any reason, including the
reason that the number of individual persons who as Unit Holders execute this
Indenture and establish this Trust and are living at the effective date of this
Trust are either so numerous or so situated that evidence of their deaths is
likely to be unreasonably difficult to obtain, then, in that event only, it is
provided that notwithstanding the duration and extension provisions of Section 1
of this Article X or any other provision of this Indenture, including the pro-

<PAGE>
                                       35

visions of the first paragraph of this Section 2, this Trust shall terminate not
later than twenty-one (21) years from and after death of the last survivor of
the following persons, all of whom were signers of the Purchase Agreement,
to-wit:

        L. C. Paslay
        J. H. Pernell
        Charles G. McBurney
        W. L. Moody, III
        R. A. Irwin
        Wright Morrow
        Ethan Stroud

and the lineal descendants of each of said persons living at the effective date
of this Trust.

    SECTION 3. For the purpose of liquidating and concluding the affairs of this
Trust at its termination otherwise than by complete conversion to a corporation,
the Trustees shall continue to act as such until their duties have been fully
performed, subject to the right of resignation and removal. At such time, after
paying, satisfying and discharging all of the debts, liabilities, and
obligations of the Trust Estate, the Trustees shall make distribution of the
Trust Estate according to the respective interests and rights of the then
Certificate Holders, executing and delivering to the persons entitled thereto
all instruments of assignment or conveyance without, however, any warranty of
title, as are proper to transfer to each Certificate Holder legal title to his
undivided share of the property then comprising the Trust Estate, in return for
the surrender of his outstanding Certificates. After so doing, the Trustees,
both Individual and Corporate, shall be under no further liability.

    SECTION 4. It is recognized by all parties that as of the date of this
Indenture no oil, gas or mineral leases have been acquired by the Purchaser
under the Purchase Agreement in the area outlined on Exhibit C attached thereto,
and that therefore Unit Holders have not acquired

<PAGE>
                                       36

any rights in any existing production payments or overriding royalty interests
or in any money payments with respect thereto. The Trust Estate as of this date
consists only of the capital stock of Tidelands Royalty "B" Corporation, the
rights of Unit Holders under the contract of Unit Holders with that Corporation,
and the contractual rights of Seller existing under the Purchase Agreement to
receive conveyances of production payments and overriding royalty interests if
and when any such leases are acquired by Purchaser as provided in the Purchase
Agreement and to receive payments with respect to oil, gas or minerals accruing
thereto if and when such substances are discovered, produced, saved and sold
from any such leases which may be so obtained by Purchaser. No party to this
Indenture makes any representation as to the value of such capital stock or
contractual rights or that any production payments or overriding royalties will
ever be acquired and become part of the Trust Estate.

     SECTION 5. This Indenture and the conveyances and assignments executed
concurrently herewith shall not take effect until Unit Holders owning at least
seventy per cent (70%) of all units under the Purchase Agreement have executed
one or more counterparts of this Indenture and such counterparts have been
executed by the Trustees and until the present owners of the rights of the
Purchaser under the Purchase Agreement have in writing approved this Indenture
and have agreed to make such payments and conveyances as the Purchaser is
obligated to make under the Purchase Agreement to the Trustees or the
Corporation, as the case may be, rather than to the Fiscal Agent or the Unit
Holders as provided in the Purchase Agreement. Upon this Indenture's becoming
effective, the Tidelands Royalty Agency "B", referred to in the Preamble of this
Indenture, shall ipso facto terminate and thereafter shall no longer be in force
and effect with respect to the interests under the Purchase Agreement of all
Unit Holders who become parties to this Indenture.

<PAGE>
                                       37

                                   APPENDIX 1
                                       TO
                      TIDELANDS ROYALTY TRUST "B" INDENTURE

                      PURCHASE AGREEMENT OF APRIL 30, 1951

THE STATE OF TEXAS
COUNTY OF HARRIS

     THIS AGREEMENT AND SALE made by and between W. L. MOODY. III, MARINE
INSTRUMENT COMPANY, MEXICAN GULF SULPHUR COMPANY, and R. A. IRWIN, Individually,
and WRIGHT MORROW and ETHAN STROUD, TRUSTEES, hereinafter collectively called
Seller," and .................. (Name deleted).............. and
 ....................(Name deleted)................... hereinafter called
"Purchaser,"

     WITNESSETH :

     Seller has represented that Seller has acquired, within the last three
years, and now owns the results of sixteen (16) geophysical reconnaissance
surveys covering in the aggregate two million, seven hundred thousand
(2,700,000) acres in the Gulf of Mexico, and has represented to Purchaser that
these surveys have indicated numerous areas of interest that might produce oil,
gas and other minerals. Seller has not disclosed to Purchaser the location of
any areas of interest in said surveys and has represented to Purchaser that
Seller has not disclosed the information obtained by these reconnaissance
surveys to any third party. Seller has, likewise, indicated that it is not
desirous of selling the information pertaining to any specific area of interest
disclosed by these surveys unless all of said surveys covering the entire
aggregate of two million, seven hundred thousand (2,700,000) acres be sold at
the same time.

     Purchaser is desirous of obtaining the exclusive use of the information
acquired and owned by Seller in these sixteen (16) surveys, including all
records of geophysical information and data indicating geological areas of
interest in the two million, seven hundred thousand (2,700,000) acres surveyed.

     Seller and Purchaser have agreed that Purchaser shall, for the
consideration hereinafter stated, be granted the absolute title to all of the
geophysical information, data, records and Seller's interpretation of the

<PAGE>
                                       38

information obtained by these reconnaissance surveys, together with the right to
the exclusive use thereof pertaining to the surveys outlined and numbered A to P
on the map attached hereto, which is made a part hereof and marked "Exhibit A."

     NOW, THEREFORE, the Seller and Purchaser agree as follows:

     In consideration of the amount to be paid Seller by Purchaser, as set forth
in paragraph II herein, Seller does hereby grant, bargain, sell and convey to
Purchaser all of the geophysical data, records and information of every kind and
character, and all copies thereof, pertaining to the areas covered by surveys A
to P outlined on "Exhibit A" hereof. It is agreed that the geophysical data,
records, information and interpretations thereof granted and transferred to
Purchaser shall include all of the items set forth in "Exhibit B," which is
attached hereto and incorporated herein by reference. It is understood and
agreed, however, that any items of geophysical data or records thereof
pertaining to the areas outlined in surveys A to P on "Exhibit A," which may not
be listed in "Exhibit B," are included in the subject matter of this contract.

     Purchaser, in consideration of the sale and transfer to it by Seller of all
of the geophysical data, records, information and Seller's interpretation of
such information pertaining to surveys numbered A to P on "Exhibit A" hereof,
hereby agrees to pay to the Seller the following amounts:

      (a) Concurrently with the execution of this agreement, Purchaser shall pay
the sum of Two Million ($2,000,000.00) Dollars to the parties named immediately
below in the amounts set forth opposite their names, to-wit

          W. L. Moody, III, One Hundred Ninety-Four Thousand Seven Hundred
     Thirty-one and 42/100 ($194,731.42) Dollars;

          Marine Instrument Company Nine Hundred Eighty-Five Thousand Six
     Hundred Fifteen and 10/100 ($985,615.10) Dollars;

          Mexican Gulf Sulphur Company, Thirty-Six Thousand ($36,000.00)
     Dollars;

          Wright Morrow and Ethan Stroud, Trustees, Five Hundred Eighty-Three
     Thousand, Six Hundred Fifty-Three and 48/100 ($583,653.48) Dollars; and,

          R. A. Irwin, Two Hundred Thousand ($200,000.00) Dollars.

<PAGE>
                                       39

     It is represented that said sixteen (16) surveys contain, for the purpose
of this contract, the aggregate of two million, seven hundred thousand
(2,700,000) acres, said aggregate number of acres being the total of the
following surveys made by Seller; the number of said surveys corresponding with
the areas outlined on "Exhibit A," to-wit:

<Table>
<Caption>
        Surveys                   Acres                      Price
<S>                              <C>                       <C>
            A                    210,000                   $ 155,610.00
            B                    220,000                     163,020.00
            C                    190,000                     140,790.00
            D                    240,000                     177,140.00
            E                    160,000                     118,560.00
            F                     80,000                      59,280.00
            G                    100,000                      74,100.00
            H                    170,000                     125,970.00
            I                    230,000                     170,430.00
            J                    150,000                     111,150.00
            K                    160,000                     118,560.00
            L                     30,000                      22,230.00
            M                    210,000                     155,610.00
            N                    160,000                     118,560.00
            0                    240,000                     177,840.00
            P                    150,000                     111,150.00
TOTAL 16                       2,700,000                  $2,000,000.00
</Table>

     (b) Purchaser agrees to make payments out of production and overriding
royalty payments to Seller, as hereinafter provided, from oil, gas or other
minerals produced, saved and sold from any of the area outlined on ,"Exhibit C"
hereof, which exhibit is incorporated herein by reference, upon which Purchaser
may, within fifty (50) years from the effective date of this agreement, acquire
an oil, gas or mineral lease or leases. The entire area outlined on "Exhibit C"
has been arbitrarily subdivided into units as indicated by the blue lines
thereon (areas not containing blue lines shall be considered a unit), for the
purpose of making definite each individual tract upon which Purchaser shall make
the following payments to the extent of and in proportion to Purchaser's
ownership in the leasehold interest therein:

          (1) Purchaser agrees to pay the parties named in "Exhibit D" hereof,
     which exhibit is incorporated herein by reference, in the proportions
     appearing after their names, or to the successors, heirs or assigns of said
     parties, the market value at the well of one-eighth

<PAGE>
                                       40

     (1/8th) of the oil and gas produced, saved and sold from the first five
     thousand (5,000) "productive acres," as hereinafter define or any portion
     thereof, until the sum of One Million Five Hundred Thousand ($1,500,000)
     Dollars has been paid from the proceeds of oil or gas produced from each of
     the units outlined on "Exhibit C;" When the parties named in "Exhibit D,"
     or their successors, heirs or assigns, shall have collectively received a
     total of One Million, Five Hundred Thousand ($1,500,000.00) Dollars from
     the first five thousand (5,000) "productive acres," or have received One
     Million, Five Hundred Thousand ($1,500,000.00) Dollars, representing the
     value of one-eighth (1/8th) of the production from any number of
     "productive acres," less than five thousand surface acres, then said
     parties shall thereafter receive from Purchaser or from Purchaser's assigns
     one-twenty-fourth (1/24th) of the market value at the well of the oil and
     gas thereafter produced, saved and sold from the aforesaid five thousand
     (5,000) "productive acres," or from each unit less than five thousand
     (5,000) surface acres from which the one Million, Five Hundred Thousand
     ($1,500,000.00) Dollars production payment hereinabove referred to has been
     paid.

          (2) If, as a result of Purchaser's operations, it should be determined
     that there are in excess of five thousand (5,000) "productive acres" on any
     of the units outlined on "Exhibit C," then Purchaser shall pay to the
     parties named in "Exhibit D" hereof, in the proportions appearing after
     their names, or to said parties' successors, heirs or assigns, the value of
     one-eighth (1/8th) of all of the oil and gas produced, saved and sold from
     such excess "productive acreage" until an amount equal to the product of
     the number of "productive acres" attributable to each said additional well
     multiplied by Three Hundred ($300.00) Dollars shall have been paid to the
     parties named in "Exhibit D," or to their successors, heirs or assigns, for
     each additional producing well, in excess of those drilled on the five
     thousand (5,000) "productive acres" hereinabove referred to: For example,
     in the event purchaser shall allocate one hundred and sixty (160) acres to
     any oil well drilled on an area in excess of the five thousand (5,000)
     "productive acres" above mentioned, the amount of oil payment payable to
     the parties named in "Exhibit D," or their successors, heirs or assigns,
     out of one-eighth (1/8th) of the oil produced, saved and sold therefrom
     would be computed by multiplying 160 by $300.00, which would equal
     Forty-Eight Thousand ($48,000.00) Dollars.

     When the parties named in "Exhibit D," or their successors, heirs or
assigns, shall have collectively received the production payment re-

<PAGE>
                                       41

ferred to in the paragraph next above, as to any oil or gas well drilled on
"productive acreage" in excess of the first five thousand (5,000) "productive
acres" referred to in (1) above, then said parties shall thereafter receive from
Purchaser or from Purchaser's assigns, one-twenty-fourth (1/24th) of the market
value at the well of the oil and gas thereafter produced, saved and sold from
said oil or gas wells from which production payments have been made in the
manner hereinabove set forth.

     For the purpose of this agreement, the number of "productive acres"
contained in any unit outlined on "Exhibit C" shall be determined by allocating
to each well which produces oil or gas in paying quantities therefrom, the
number of surface acres allocated to such well for wellspacing purposes by any
regulatory body with jurisdiction in the premises, and it shall, for the
purposes of this agreement, be conclusively presumed that the number of acres so
allocated by the aforesaid regulatory body are "productive acres," as that term
is used in this agreement. In the absence of any regulation prescribing the
number of surface acres to be allocated to each producing well in any area or
areas subject to this agreement, Purchaser shall determine the maximum area that
can be effectively drained by one well and it shall be conclusively presumed
that the number of acres which Purchaser allocates to each well from which oil
or gas is produced, saved and sold, are "productive areas," [sic] as that term
is used herein; provided, however, that Purchaser, in computing "productive
acres" shall not allocate less than forty (40), nor more than six hundred forty
(640), surface acres to any well drilled on the subject premises, regardless of
the number of sands or formations from which there may be production; and
provided further, that no additional wells on the surface acreage already
allocated to a producing well shall increase the amount of "productive acres,"
as herein defined. It is agreed that the sole purpose of this paragraph is to
establish a standard for computing the five thousand (5,000) acre unit from
which the production payment of One Million, Five Hundred Thousand
($1,500,000.00) Dollars, hereinabove referred to, shall be paid by Purchaser, or
its assigns, together with a standard for computing the amount of the production
payment due from each oil or gas well drilled on any of the units outlined on
"Exhibit C" hereof, which has a surface area in excess of five thousand (5,000)
"Productive acres." The procedure herein set forth for determining the number of
"productive acres" is not intended to impose any duty on Purchaser to drill for
oil or gas, or other minerals, according to any particular spacing pattern or
density, it being the intention of the parties hereto that Purchaser shall never
at any time be under any duty to drill for or produce oil, gas or other minerals
from any area subject to this agreement, notwithstanding the existence of
producing wells thereon.

<PAGE>
                                       42

        (3) In addition to the provisions for the payments out of production and
overriding royalties provided for in this paragraph, Purchaser agrees to pay
the parties named in Exhibit D, or their successors, heirs or assigns, in the
proportions set forth opposite their names, an amount equal to one-twenty-fourth
(1/24th) of the value at the well of all minerals of every kind and character
produced, saved and sold, except oil and gas, this payment on all other
minerals, except oil and gas, to commence upon the production of such other
minerals and to be paid, irrespective of the amount of proven acreage from which
such other minerals are being produced, and such sums as accrue under this
provision shall not be included in making up the payments out of production
provided for in this paragraph.

        Should any lease subject to the production payment or overriding royalty
provided for above either expire or terminate after the expiration of the fifty-
(50) year period hereinabove referred to, and a new lease covering the same land
or any part of the land covered by such prior lease be acquired by Purchaser,
then the parties named in "Exhibit D," or their successors, heirs or assigns,
shall be entitled to the same payments out of production and overriding
royalties provided above under such new lease, in so far as the same covers
lands included within the original lease. Purchaser shall not make payments out
of production or any overriding royalties from any lease or leases acquired by
Purchaser hereto after the fifty (50) year period mentioned above, except as to
extensions and repurchases as provided above.

      In order to preserve the element of secrecy inherent in this agreement,
Seller has, at Purchaser's request, entered into an agency agreement with the
Republic National Bank of Dallas, Texas, dated April 30, 1951, and Purchaser
hereby agrees that for a period of five (5) years from the date hereof, it will
make all production payments and overriding royalty- payments arising under the
terms of paragraph II (b) herein, direct to Republic National Bank of Dallas,
Texas, for the benefit of the parties named in "Exhibit D" hereof, as provided
for in the aforementioned agency agreement.

      Payment by Purchaser to the Republic National Bank of Dallas, Texas, in
the manner above provided, shall relieve Purchaser of all obligations arising
under paragraph II (b) of this contract during said five (5) year period.

<PAGE>
                                       43

     Upon the termination of the five (5) year period following the execution of
this agreement, the Republic National Bank of Dallas, Texas, shall, as
contemplated by the aforesaid agency agreement, furnish Purchaser with the names
of the then owners of the interests created by the terms of this agreement,
along with the bank's records evidencing all transfers of said interests prior
to the termination of the aforementioned five (5) year period; whereupon,
Purchaser, for a reasonable handling charge to be borne by each assignee, shall
assign by instruments in writing to such owners of interests in this contract,
the production payments and overriding royalties pertaining to all leases which
Purchaser has then acquired on any of the areas outlined on "Exhibit C" hereof,
and shall thereafter, at any time within fifty (50) years from the date hereof,
upon obtaining additional leases in the area outlined on "Exhibit C" attached,
execute similar assignments of production payments and overriding royalties in
writing to the then owners of the interests created by this contract. After the
assignments of the production payments and overriding royalties referred to
above Purchaser shall make payments accruing thereunder directly to the
assignees of said production payments and overriding royalties, deducting
therefrom a reasonable charge to cover the costs of writing checks and making
disbursements to said assignees.

     Transfers of any interest in this contract by Seller, after the termination
of the agency agreement with the Republic National Bank of Dallas, Texas, other
than interests upon which Purchaser has executed assignments of oil payments and
overriding royalties, shall be made in accordance with procedure followed during
the term of the agency agreement with the Republic National Bank of Dallas,
Texas, except that Purchaser herein, rather than Republic National Bank of
Dallas, Texas, shall be the custodian of the records of such transfers. Seller
agrees that Purchaser can make reasonable handling charges for this service.

     Nothing in this agreement shall ever obligate Purchaser to acquire any
lease or leases or to drill any well or to develop any lease or leases, if
acquired. The oil payment and overriding royalty provisions set out herein shall
apply to oil, gas and other minerals only when, as and if produced, saved and
sold by Purchaser or its assigns.

                                       V.

     It is agreed that the very nature of the subject matter of this contract is
such that the geophysical information and data and the interpretation thereof,
purchased herein, would be greatly reduced in value, if not

<PAGE>
                                       44

utterly destroyed, unless Purchaser has and shall continue to have the exclusive
use of such information and data. It is further agreed that the consideration
which Purchaser has agreed to pay for the geophysical data herein transferred
and sold by Seller has been agreed to only after Seller's representation and
assurance that Purchaser is acquiring the exclusive right to this information
and data, and Seller's interpretation thereof, and in this connection, Seller
warrants that it has not disclosed and will not hereafter disclose to any third
party, or parties, any of such information and data.

     In regard to the geophysical data, records and information and Seller's
interpretation thereof, herein sold and transferred, Seller covenants and agrees
that it is conveying absolute title to all of said data, and that Seller has not
retained copies of any such records, data or information from which the
geophysical data herein sold and transferred to Purchaser can be reassembled for
use by any one other than Purchaser herein; and Seller agrees that in the event
of its breach of this covenant, Purchaser shall have the right and option of
cancelling and holding for naught the provisions of paragraph II (b)
hereinabove; and Seller, after such breach of this covenant of secrecy shall
never be entitled to any of the overriding royalties mentioned in said paragraph
II (b) hereinabove. Seller further agrees that it will be liable to Purchaser
for any actual damages sustained by Purchaser as a result of any such breach of
this covenant of secrecy on the part of Seller. In this connection, it is agreed
that Seller's copy of this contract shall not include a copy of said "Exhibit
C". However, it is agreed that L. C. Paslay, J.H. Pernell or C.G. McBurney, or
their successors, as hereinafter provided for, upon reasonable notice and at all
reasonable times, in Purchaser's presence, may examine "Exhibit C" and any other
data that Purchaser has obtained from Seller for the purpose of ascertaining for
themselves or for any other owner of any interests in this contract whether the
Purchaser is fulfilling and complying with the terms of this contract. The
aforementioned persons, or their successors, shall also have the right to
inspect Purchaser's production records for the purpose of determining whether
Purchaser is complying with the terms of paragraph II (b) hereinabove. Upon the
death of any of the above named three persons, the survivor or survivors, shall
appoint a successor, agreeable to Purchaser, to such deceased person or persons,
and notify Purchaser in writing of such appointment. Such successor or
successors appointed in the manner above provided for shall continue to have the
same rights and privileges for the benefit of the owners of Seller's interests
in this contract here now given to said three above named persons.

<PAGE>
                                       45

                                      VII.

      Seller agrees that it will not, for a period of fifty (50) years from the
date of the execution of this agreement, conduct any geophysical work in the
areas outlined in "Exhibit A," attached hereto; and in this connection, Seller
agrees that they will not dispose of the boat with which these sixteen (16)
surveys were made in a manner whereby said boat as now equipped will be used by
any one in said area. The Seller also agrees that it will not, for a period of
Fifty (50) years after the date of the execution of this contract agreement,
participate in any manner in obtaining or attempting to obtain any lease or
leases in the areas designated and outlined in "Exhibit A" hereto attached, and
should Seller, its principals and beneficiaries, ever acquire any leasehold
estate in any part of the areas designated on said "Exhibit A," then and in that
event, Purchaser, at its option, shall have the right to acquire from Seller,
and Seller shall, in the event of Purchaser's election, transfer and assign to
Purchaser such leasehold interest at such price and upon the same terms as
Seller acquired such lease.

      Purchaser herein shall have the right to assign in whole or in part any
lease or leases acquired by it covering any portion of the area outlined in
"Exhibit C," and any such assignment shall be made subject to the oil payments
and overriding royalty provided for in paragraph II(b) above. Purchaser likewise
covenants and agrees that should it transfer or assign any of the information,
data, records, or Seller's interpretation thereof, to any third party, such
transfer or assignment shall be made subject to the oil payments and overriding
royalty payment provided for in paragraph II (b) hereinabove.

      In this connection, it is agreed that Seller may, in the manner
hereinabove provided, likewise assign their interests in this agreement, it
being understood that any such assignment shall be subject to the terms of this
agreement.

        In order to create a "pooled area" for the purpose of mining and
drilling for, producing and processing oil and gas or other minerals or any one
or more of said minerals, Seller hereby covenants and agrees with Purchaser that
Purchaser may and Purchaser is hereby authorized and empowered by Seller to at
any time or from time to time "pool" the area subject to this agreement or any
part or parts thereof with any adjoining and adjacent area. To accomplish the
foregoing, Purchaser shall execute an instrument in writing with the leasehold
owners of the areas to be

<PAGE>
                                       46

pooled, designating the pooled area, describing the several tracts constituting
the same, reciting the acreage in each tract, and specifying the mineral or
minerals affected thereby. Upon the execution of the aforesaid instrument, such
pooled area shall be deemed to have been effectively created under the terms
hereof and thereafter for all purposes other than the payment of royalties,
which is hereinafter provided for, any operation for drilling or reworking on or
any production of oil and gas or mineral from such pooled area, shall have the
same effect as if said operations were in fact conducted upon or such production
was procured from each of the tracts of land comprising such pooled area created
under the terms hereof, irrespective of the actual location of the well or wells
upon which such operations are conducted, or from which production is procured.
In like manner and with like effect, the "pooled area" may be increased or
decreased. Of the total production from such pooled area, regardless from which
tract it is actually produced, there shall be allocated to the tract covered by
this agreement that part thereof which is arrived at by multiplying such total
production by a fraction, the numerator of which shall be the number of acres
covered by this agreement which is in said pooled area, and the denominator of
which shall be the number of acres in the entire pooled area, which production
so allocated to such tract shall be conclusively presumed to have been procured
from land in the said pooled area covered by this agreement, and the royalties
or payments elsewhere herein provided for shall be calculated solely upon such
production so allocated to such tract.

      Should the title to any tract of land embraced within any pooled area fail
in whole or in part or as to an undivided interest therein, or should any part
of the land within said pooled area be released or surrendered, then the acreage
contained in such tract and the total acreage contained in such pooled area
shall be reduced to the extent of such failure of title or release, and
thereafter the subsequent production shall be allocated accordingly, but no
retroactive allocation to Seller shall ever be required as a result of any
failure of title. Should such tract or any part thereof, or other land in lieu
thereof, be again effectively brought into such pooled area, then to such extent
specified in the redesignation of said pooled area, the production therefrom
shall be reallocated as the facts may permit or require. The words "pool,"
"pooled," and "pooled area," and words of expression of like import used herein,
shall have the meaning ordinarily attributed to them by those engaged in the
production of oil and gas and sulphur and other minerals.

                                       X.

      Any and all notices required to be given under the terms of this agreement
shall be addressed TO PURCHASER AT ............................,,,,,.......
(ADDRESS

<PAGE>
                                       47

deleted) ....................... ..... . ... and to Seller at 6111 Maple Avenue,
Dallas, Texas, or to any such other address. as they, d either of them may, from
time to time, designate by written notice, delivered to the part [sic] to be
bound thereby.

     All taxes which may be levied against any payment or payments, or right to
such payment or payments as set forth in paragraph II hereinabove, shall be
borne and paid by Seller.

                                      XII.

     Seller and each of them warrant that they have complete title to the
information, records, data and Seller's interpretation thereof, and that they
collectively have the right and authority to convey the subject matter of this
contract.

     IN WITNESS WHEREOF, this instrument is executed by the parties hereto in
two counterparts, as of the 30th day of April, A. D. 1951. W. L. MOODY, III

                    W. L. Moody, III.

                    MARINE INSTRUMENT COMPANY,

                    By L. C. PASLAY
                       J. H. PERNELL
                       CHAS. G. MCBURNEY

                    MEXICAN GULF SULPHUR COMPANY,

                    By EUGENE L. NORTON,
                    President.

ATTEST:

    OLGA SMITH, Asst. Secretary.

                    R. A. IRWIN

                           R. A. Irwin.

                    ETHAN STROUD

                           Ethan Stroud, Trustee.

                    WRIGHT MORROW

                           Wright Morrow, Trustee.   SELLER

<PAGE>
                                       48

                             ................ (name deleted) ................

                             By (name deleted)...............................
                                               Vice President.
ATTEST
 ................ (Name deleted)................
(SEAL)

                             .............. . (name deleted)................

                             By (name deleted)..............................
                                               Vice President.
                                                              PURCHASER
ATTEST

 ..... .... ..... (Name deleted) .......... . ....
(SEAL)

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