Document:

EXHIBIT 4-d

                           [Form of Deposit Agreement]

                            SBC COMMUNICATIONS INC.,

                    [NAME OF DEPOSITARY BANK], as Depositary,
                                       and

                        THE HOLDERS FROM TIME TO TIME OF

                    THE DEPOSITARY RECEIPTS DESCRIBED HEREIN

                                Deposit Agreement

                        relating to [insert designation]
                   Preferred Stock of SBC Communications Inc.

                                  Dated as of ,

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                                TABLE OF CONTENTS

                                                                           Page
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PARTIES.......................................................................1
RECITALS......................................................................1

                                    Article I

                                   Definitions

Certificate...................................................................2
Company.......................................................................2
Depositary....................................................................2
Depositary's Agent............................................................2
Depositary Shares.............................................................2
Depositary's Office...........................................................2
Preferred Stock...............................................................2
Receipt.......................................................................2
Record holder.................................................................3
Registrar.....................................................................3
Stock.........................................................................3

                                   Article II

           Form of Receipts, Deposit of Preferred Stock, Execution and
            Delivery, Transfer, Surrender and Redemption of Receipts

SECTION 2.01.   Form and Transfer of Receipts.................................3
SECTION 2.02.   Deposit of Preferred Stock; Execution and Delivery of
                Receipts in Respect Thereof...................................4
SECTION 2.03.   Redemption of Preferred Stock.................................5
SECTION 2.04.   Registration of Transfer of Receipt...........................6
SECTION 2.05.   Split-ups and Combinations of Receipts; Surrender of
                Receipts and Withdrawal of Preferred Stock....................6
SECTION 2.06.   [Conversion and Exchange of Preferred Stock...................7
SECTION 2.07.   Limitations on Execution and Delivery, Transfer, Surrender
                and Exchange of Receipts......................................7
SECTION 2.08.   Lost Receipts, etc............................................8
SECTION 2.09.   Cancellation and Destruction of Surrendered Receipts..........8

                                   Article III

                         Certain Obligations of Holders
                           of Receipts and the Company

SECTION 3.01.   Filing Proofs, Certificates and Other Information.............8
SECTION 3.02.   Payment of Taxes or Other Governmental Charges................8
SECTION 3.03.   Warranty as to Preferred Stock................................9

                                      -i-

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                                   Article IV

                        The Deposited Securities; Notices

SECTION 4.01.   Cash Distributions............................................9
SECTION 4.02.   Distributions Other than Cash, Rights, Preferences or
                Privileges....................................................9
SECTION 4.03.   Subscription Rights, Preferences or Privileges...............10
SECTION 4.04.   Notice of Dividends, etc.; Fixing of Record Date for
                Holders of Receipts..........................................11
SECTION 4.05.   Voting Rights................................................11
SECTION 4.06.   Changes Affecting Deposited Securities and
                Reclassifications, Recapitalizations, etc....................11
SECTION 4.07.   Inspection of Reports........................................12
SECTION 4.08.   Lists of Receipt Holders.....................................12
SECTION 4.09.   Tax and Regulatory Compliance................................12
SECTION 4.10.   Withholding..................................................12

                                    Article V

                    The Depositary, the Depositary's Agents,
                          the Registrar and the Company

SECTION 5.01.   Maintenance of Offices, Agencies and Transfer Books by
                the Depositary; Registrar....................................13
SECTION 5.02.   Prevention of or Delay in Performance by the Depositary,
                the Depositary's Agents, the Registrar or the Company........13
SECTION 5.03.   Obligations of the Depositary, the Depositary's Agents,
                the Registrar and the Company................................14
SECTION 5.04.   Resignation and Removal of the Depositary; Appointment
                of Successor Depositary......................................14
SECTION 5.05.   Corporate Notices and Reports................................15
SECTION 5.06.   Indemnification by the Company...............................15
SECTION 5.07.   Charges and Expenses.........................................16

                                   Article VI

                            Amendment and Termination

SECTION 6.01.   Amendment....................................................16
SECTION 6.02.   Termination..................................................16

                                   Article VII

                                  Miscellaneous

SECTION 7.01.   Counterparts.................................................17
SECTION 7.02.   Exclusive Benefit of Parties.................................17
SECTION 7.03.   Invalidity of Provisions.....................................17
SECTION 7.04.   Notices......................................................17
SECTION 7.05.   Depositary's Agents..........................................18
SECTION 7.06.   Holders of Receipts Are Parties..............................18
SECTION 7.07.   Governing Law................................................18
SECTION 7.08.   Inspection of Agreement......................................18
SECTION 7.09.   Headings.....................................................18
TESTIMONIUM..................................................................17

                                      -ii-

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SIGNATURES...................................................................17
EXHIBIT A:  Form of Depositary Receipt

                                     -iii-

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         DEPOSIT AGREEMENT dated as of , , among SBC Communications Inc., a
Delaware corporation (the "Company"), [NAME OF DEPOSITARY BANK], a , as
depositary (the "Depositary"), and the holders from time to time of the Receipts
described herein.

         WHEREAS, it is desired to provide, as hereinafter set forth in this
Agreement, for the deposit of [insert designation of preferred shares], $1.00
par value (the "Preferred Stock"), of the Company with the Depository for the
purposes set forth in this Agreement and for the issuance hereunder of Receipts
(as defined below) evidencing Depositary Shares (as defined below) in respect of
the Preferred Stock so deposited; and

         WHEREAS, the Receipts are to be substantially in the form of Exhibit A
hereto, with appropriate insertions, modifications and omissions, as hereinafter
provided in this Agreement;

         NOW, THEREFORE, the parties hereto agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

         The following definitions shall for all purposes, unless otherwise
indicated or the context otherwise, apply to the respective terms used in this
Agreement:

         "Certificate" shall mean the statement filed with the Secretary of
State of the State of Delaware establishing the Preferred Stock as a series of
preferred shares of the Company.

         "Company" shall mean SBC Communications Inc., a Delaware corporation,
and its successors.

         "Depositary" shall mean __________, a __________, and any successor as
Depositary hereunder.

         "Depositary's Agent" shall mean an agent appointed by the Depositary
pursuant to Section 7.05.

         "Depositary Shares" shall mean Depositary Shares, each representing
[SPECIFY FRACTION] of a share of Preferred Stock and evidenced by a Receipt.

         "Depositary's Office" shall mean the principal office of the depositary
in [LOCATION], at which at any particular time its depositary receipt business
shall be administered.

         "Preferred Stock" shall mean __________.

         "Receipt" shall mean one of the Depositary Receipts issued hereunder,
whether in definitive or temporary form.

         "Record holder" as applied to a Receipt shall mean the person in whose
name a Receipt is registered on the books of the Depositary maintained for such
purpose.

                                      -2-

         "Registrar" shall mean any bank or trust company that shall be
appointed to register ownership and transfers of Receipts as herein provided.

         "Stock" shall mean shares of the Company's [insert designation of
preferred stock], $1 par value per share.

                                   ARTICLE II

                  FORM OF RECEIPTS, DEPOSIT OF PREFERRED STOCK,
                 EXECUTION AND DELIVERY, TRANSFER, SURRENDER AND
                             REDEMPTION OF RECEIPTS

         SECTION 2.01.  Form and Transfer of Receipts. Definitive Receipts
shall be engraved or printed or lithographed on steel-engraved borders and shall
be substantially in the form set forth in Exhibit A hereto, with appropriate
insertions, modifications and omissions, as hereinafter provided. Pending the
preparation of definitive Receipts, the Depositary, upon the written order of
the Company or any holder of Preferred Stock, as the case may be, delivered for
deposit in compliance with Section 2.02, shall execute and deliver temporary
Receipts which are printed, lithographed, typewritten, mimeographed or otherwise
substantially of the tenor of the definitive Receipts in lieu of which they are
issued and with such appropriate insertions, omissions, substitutions and other
variations as the persons executing such Receipts may determine, as evidenced by
their execution of such Receipts. If temporary Receipts are issued, the Company
and the Depositary will cause definitive Receipts to be prepared without
unreasonable delay. After the preparation of definitive Receipts, the temporary
Receipts shall be exchangeable for definitive Receipts upon surrender of the
temporary Receipts at an office described in the second to last paragraph of
Section 2.02, without charge to the holder. Upon surrender for cancellation of
any one or more temporary Receipts, the Depositary shall execute and deliver in
exchange therefor definitive Receipts representing the same number of Depositary
Shares as represented by the surrendered temporary Receipt or Receipts. Such
exchange shall be made at the Company's expense and without any charge therefor.
Until so exchanged, the temporary Receipts shall in all respects be entitled to
the same benefits under this Agreement, and with respect to the Preferred Stock
deposited hereunder, as definitive Receipts.

         Receipts shall be executed by the Depositary by the manual signature of
a duly authorized officer of the Depositary; provided, however, that such
signature may be a facsimile if a Registrar for the Receipts (other than the
Depositary) shall have been appointed and such Receipts are countersigned by
manual signature of a duly authorized officer of the Registrar. No Receipt shall
be entitled to any benefits under this Agreement or be valid or obligatory for
any purpose unless it shall have been executed manually by a duly authorized
officer of the Depositary or, if a Registrar for the Receipts (other than the
Depositary) shall have been appointed, by manual or facsimile signature of a
duly authorized officer of the Depositary and countersigned manually by a duly
authorized officer of such Registrar. The Depositary shall record on its books
each Receipt so signed and delivered as hereinafter provided.

         Except as the Depositary may otherwise determine, Receipts shall be in
denominations of any number of whole Depositary Shares.

         Receipts may be endorsed with or have incorporated in the text thereof
such legends or recitals or changes not inconsistent with the provisions of this
Agreement as may be required by the Depositary or required to comply with any
applicable law or any regulation

                                       -3-

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thereunder or with the rules and regulations of any securities exchange upon
which the Preferred Stock, the Depositary Shares or the Receipts may be listed
or to conform with any usage with respect thereto, or to indicate any special
limitations or restrictions to which any particular Receipts are subject.

         Title to Depositary Shares evidenced by a Receipt that is properly
endorsed, or accompanied by a properly executed instrument of transfer, shall be
transferable by delivery with the same effect as in the case of a negotiable
instrument; provided, however, that until transfer of a Receipt shall be
registered on the books of the Depositary as provided in Section 2.04, the
Depositary may, notwithstanding any notice to the contrary, treat the record
holder thereof at such time as the absolute owner thereof for the purpose of
determining the person entitled to distributions of dividends or other
distributions or to any notice provided for in this Agreement and for all other
purposes.

         SECTION 2.02.  Deposit of Preferred Stock; Execution and Delivery of
Receipts in Respect Thereof. Subject to the terms and conditions of this
Agreement, the Company or any holder of Preferred Stock may from time to time
deposit shares of Preferred Stock under this Agreement by delivery to the
Depositary of (i) a certificate or certificates for the shares of Preferred
Stock to be deposited, properly endorsed or accompanied, if required by the
Depositary, by a duly executed instrument of transfer or endorsement, in form
satisfactory to the Depositary, (ii) all certifications as may be required by
the Depositary in accordance with the provisions of this Agreement, and (iii) a
written order of the Company or such holder, as the case may be, directing the
Depositary to execute and deliver to, or upon the written order of, the person
or persons stated in such order a Receipt or Receipts for the number of
Depositary Shares representing such deposited shares of Preferred Stock.

         Upon receipt by the Depositary of a certificate or certificates for the
shares of Preferred Stock deposited in accordance with the provisions of this
Section, together with the other documents required, and upon registration of
such shares of Preferred Stock on the books of the Company in the name of the
Depositary or its nominee, the Depositary, subject to the terms and conditions
of this Agreement, shall execute and deliver, to or upon the order of the person
or persons named in the written order delivered to the Depositary referred to in
the first paragraph of this Section, a Receipt or Receipts for the number of
Depositary Shares representing such shares of Preferred Stock and registered in
such name or names as may be requested by such person or persons.

         Certificates in the name of the Depositary for the deposited shares of
Preferred Stock shall be held by the Depositary at the Depositary's Office or at
such other place or places as the Depositary shall determine.

         The Depositary shall execute and deliver such Receipt or Receipts at
the Depositary's Office or such other offices, if any, as the Depositary may
designate. Delivery at other offices shall be at the risk and expense of the
person requesting such delivery.

         Other than in the case of splits, combinations or other
reclassifications affecting the Preferred Stock, or in the case of dividends or
other distributions of Preferred Stock, if any, there shall be deposited
hereunder not more than [NUMBER] shares of Preferred Stock.

         SECTION 2.03.  Redemption of Preferred Stock. Whenever the Company
shall elect to redeem shares of Preferred Stock deposited hereunder in
accordance with the provisions of the Certificate, if the Certificate provides
for such redemption, it shall (unless otherwise agreed

                                       -4-

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in writing with the Depositary) give the Depositary not less than 40 nor more
than 70 days' notice of the date of such proposed redemption of the Preferred
Stock, which notice shall be accompanied by a certificate from the Company
stating that such redemption of the Preferred Stock is in accordance with the
provisions of the Certificate. Such notice, if given more than 60 days prior to
the redemption date, shall be in addition to the notice required to be given for
redemption pursuant to the Certificate. On the date of such redemption, provided
that the Company shall then have paid in full to the Depositary the redemption
price of any deposited shares of Preferred Stock to be redeemed, plus any
accrued and unpaid dividends thereon, the Depositary shall redeem the number of
Depositary Shares representing such shares of Preferred Stock. The Depositary
shall mail notice of such redemption and the proposed simultaneous redemption of
the number of Depositary Shares representing the deposited shares of Preferred
Stock to be redeemed, first-class postage prepaid, not less than 30 and not more
than 60 days prior to the date fixed for redemption of such Preferred Stock and
Depositary Shares (the "Redemption Date"), to the record holders of the Receipts
evidencing the Depositary Shares to be so redeemed, at the addresses of such
holders as they appear on the records of the Depositary; but neither failure to
mail any such notice to one or more such holders nor any defect in any notice to
one or more such holders shall affect the sufficiency of the proceedings for
redemption as to other holders. Each such notice shall state: (i) the Redemption
Date; (ii) the number of Depositary Shares to be redeemed and, if less than all
the Depository Shares held by any such holder are to be redeemed, the number of
such Depositary Shares held by such holder to be so redeemed; (iii) the
redemption price; (iv) the place or places where Receipts evidencing Depositary
Shares are to be surrendered for payment of the redemption price; and (v) that
dividends in respect of the shares of Preferred Stock represented by the
Depositary Shares to be redeemed will cease to accumulate and that conversion
rights, if any, in respect thereof will terminate at the close of business on
such Redemption Date. In case less than all the outstanding Depositary Shares
are to be redeemed, the Depositary Shares to be so redeemed shall be selected by
lot or pro rata as may be determined by the Depositary to be equitable.

         Notice having been mailed by the Depositary as aforesaid, from and
after the Redemption Date (unless the Company shall have failed to redeem the
deposited shares of Preferred Stock to be redeemed by it as set forth in the
Company's notice provided for in the preceding paragraph) all dividends in
respect of the deposited shares of Preferred Stock so called for redemption
shall cease to accumulate, the Depositary Shares being redeemed from such
proceeds shall be deemed no longer to be outstanding, all rights of the holders
of Receipts evidencing such Depositary Shares (except the right to receive the
redemption price) shall, to the extent of such Depositary Shares cease and
terminate and, upon surrender in accordance with such notice of the Receipts
evidencing any such Depositary Shares (properly endorsed or assigned for
transfer, if the Depositary shall so require), such Depositary Shares shall be
redeemed by the Depositary at a redemption price per Depositary Share equal to
[SPECIFY FRACTION] of the redemption price per share paid in respect of the
redeemed deposited shares of Preferred Stock plus all money and other property,
if any, represented by such Depositary Shares, including all amounts paid by the
Company in respect of dividends which on the Redemption Date have accumulated on
the shares of Preferred Stock to be so redeemed and have not theretofore been
paid.

         If less than all the Depositary Shares evidenced by a single Receipt
are called for redemption, the Depositary will deliver to the holder of such
Receipt upon its surrender to the Depositary a new Receipt evidencing the
Depositary Shares evidenced by such prior Receipt and not called for redemption,
together with the redemption payment.

                                       -5-

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         SECTION 2.04.  Registration of Transfer of Receipt. Subject to the
terms and conditions of this Agreement, the Depositary shall register on its
books from time to time transfers of Receipts upon any surrender thereof by the
holder in person or by duly authorized attorney, properly endorsed or
accompanied by a properly executed instrument of transfer. Thereupon the
Depositary shall execute a new Receipt or Receipts evidencing the same aggregate
number of Depositary Shares as those evidenced by the Receipt or Receipts
surrendered and deliver such new Receipt or Receipts to or upon the order of the
person entitled thereto.

         SECTION 2.05.  Split-ups and Combinations of Receipts; Surrender of
Receipts and Withdrawal of Preferred Stock. Upon surrender of a Receipt or
Receipts at the Depositary's Office or at such other offices as it may designate
for the purpose of effecting a split-up or combination of such Receipt or
Receipts, and subject to the terms and conditions of this Agreement, the
Depositary shall execute and deliver a new Receipt or Receipts in the authorized
denomination or denominations requested, evidencing the aggregate number of
Depositary Shares evidenced by the Receipt or Receipts surrendered.

         Any holder of a Receipt or Receipts representing a whole number of
deposited shares of Preferred Stock may withdraw such shares of Preferred Stock
and all money and other property, if any, represented thereby by surrendering
such Receipt or Receipts at the Depositary's Office or at such other offices as
the Depositary may designate for such withdrawals. Thereafter, without
unreasonable delay, the Depositary shall deliver to such holder, or to the
person or persons designated by such holder as hereinafter provided the number
of shares of Preferred Stock and all money and other property, if any,
represented by the Receipt or Receipts so surrendered for withdrawal, but
holders of such shares of Preferred Stock will not thereafter be entitled to
deposit such shares of Preferred Stock hereunder or to receive Depositary Shares
therefor. If a Receipt delivered by the holder to the Depositary in connection
with such withdrawal shall evidence a number of Depositary Shares in excess of
the number of deposited Depositary Shares representing the number of shares of
Preferred Stock to be so withdrawn, the Depositary shall at the same time, in
addition to such number of shares of Preferred Stock and such money and other
property, if any, to be so withdrawn, deliver to such holder, or (subject to
Section 2.03) upon his order, a new Receipt evidencing such excess number of
Depositary Shares. Delivery of the shares of Preferred Stock and money and other
property being withdrawn may be made by the delivery of such certificates,
documents of title and other instruments as the Depositary may deem appropriate.

         If the shares of Preferred Stock and the money and other property, if
any, being withdrawn are to be delivered to a person or persons other than the
record holder of the Receipt or Receipts being surrendered for withdrawal of the
Preferred Stock, such holder shall execute and deliver to the Depositary a
written order so directing the Depositary and the Depositary may require that
the Receipt or Receipts surrendered by such holder for withdrawal of such shares
of Preferred Stock be appropriately endorsed or accompanied by a properly
executed instrument of transfer.

         Delivery of the shares of Preferred Stock and the money and other
property, if any, represented by Receipts surrendered for withdrawal shall be
made by the Depositary at the Depositary's Office, except that, at the request,
risk and expense of the holder surrendering such Receipt or Receipts and for the
account of the holder thereof, such delivery may be made at such other place as
may be designated by such holder.

                                       -6-

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         SECTION 2.06.  [Conversion and Exchange of Preferred Stock. Upon a
conversion or exchange of the Depositary Shares the Depositary shall convert or
exchange all of the Depositary Shares on the day that the related Preferred
Stock is so converted or exchanged. The Company hereby agrees to deposit with
the Depositary the other preferred stock, common stock or other securities into
which the Preferred Stock is to be converted or for which it will be exchanged.
Further, the Company agrees to accept the delivery of Receipts for the purpose
of effecting conversions or exchanges of the Preferred Stock utilizing the
procedures set forth for delivery of certificates for the Preferred Stock
pursuant to Section 2.02 hereof and in accordance with the terms and conditions
of the Preferred Stock as provided in the Certificate. If the Depositary Shares
represented by a Receipt are to be converted or exchanged in part only, a new
Receipt or Receipts will be issued by the Depositary for the Depositary Shares
not to be converted or exchanged. For this purpose, a holder of a Receipt or
Receipts must surrender such Receipt or Receipts to the Company, in care of the
Depositary at its office together with a duly completed and executed notice of
conversion. In all cases the foregoing shall be conditioned upon compliance in
full by the holders with the terms and conditions of the Preferred Stock as
provided in the Certificate and of this Deposit Agreement. The Company and the
Depositary will thereafter effect the cancellation of each Receipt surrendered
for such conversion or exchange and of the related Preferred Stock as provided
in the Certificate and this Deposit Agreement.

         Except as further specified in the Certificate, the exchange or
conversion rate per Depositary Share will be equal to (i) the exchange rate or
conversion rate per share of Preferred Stock, multiplied by the fraction of a
share of Preferred Stock represented by one Depositary Share; (ii) plus the
total amount of money and any other property represented by the Depositary
Shares; and (iii) including all amounts paid by the Company for accrued and
unpaid dividends on the Preferred Stock on the exchange or conversion date.]

         SECTION 2.07.  Limitations on Execution and Delivery, Transfer,
Surrender and Exchange of Receipts. As a condition precedent to the execution
and delivery, registration of transfer, split-up, combination, surrender or
exchange of any Receipt, the Depositary, any of the Depositary's Agents or the
Company may require payment to it of a sum sufficient for the payment (or, in
the event that the Depositary or the Company shall have made such payment, the
reimbursement to it) of any charges or expenses payable by the holder of a
Receipt pursuant to Section 5.07, may require the production of evidence
satisfactory to it as to the identity and genuineness of any signature and may
also require compliance with such regulations, if any, as the Depositary or the
Company may establish consistent with the provisions of this Agreement.

        The deposit of shares of Preferred Stock may be reused, the delivery of
Receipts against Preferred Stock may be suspended, the registration of transfer
of Receipts may be refused and the registration of transfer, surrender or
exchange of outstanding Receipts may be suspended (i) during any period when the
register of shareholders of the Company is closed or (ii) if any such action is
deemed necessary or advisable by the Depositary, any of the Depositary's Agents
or the Company at any time or from time to time because of any requirement of
law or of any government or governmental body or commission or under any
provisions of this Agreement.

                                       -7-

<PAGE>

         SECTION 2.08.  Lost Receipts, etc. In case any Receipt shall be
mutilated, destroyed, lost or stolen, the Depositary in its discretion may
execute and deliver a Receipt of like form and tenor in exchange and
substitution for such mutilated Receipt, or in lieu of and in substitution for
such destroyed, lost or stolen Receipt, upon (i) the filing by the holder
thereof with the Depositary of evidence satisfactory to the Depositary of such
destruction or loss or theft of such Receipt, of the authenticity thereof and of
his or her ownership thereof, and (ii) the furnishing of the Depositary with
reasonable indemnification satisfactory to it.

         SECTION 2.09.  Cancellation and Destruction of Surrendered Receipts.
All Receipts surrendered to the Depositary or any Depositary's Agent shall be
cancelled by the Depositary. Except as prohibited by applicable law or
regulation, the Depositary is authorized to destroy all Receipts so cancelled.

                                   ARTICLE III

                         CERTAIN OBLIGATIONS OF HOLDERS
                           OF RECEIPTS AND THE COMPANY

         SECTION 3.01.  Filing Proofs, Certificates and Other Information.
Any holder of a Receipt may be required from time to time to file such proof of
residence, or other matters or other information, to execute such certificates
and to make such representations and warranties as the Depositary or the Company
may reasonably deem necessary or proper. The Depositary or the Company may
withhold the delivery, or delay the registration of transfer, redemption or
exchange, of any Receipt or the withdrawal of the Shares of Preferred Stock
represented by the Depositary Shares evidenced by any Receipt or the
distribution of any dividend or other distribution or the sale of any rights or
of the proceeds thereof until such proof or other information is filed or such
certificates are executed or such representations and warranties are made.

         SECTION 3.02.  Payment of Taxes or Other Governmental Charges.
Holders of Receipts shall be obligated to make payments to the Depositary of
certain charges and expenses, as provided in Section 5.07. Registration of
transfer of any Receipt or any withdrawal of shares of Preferred Stock and all
money or other property, if any, represented by the Depositary Shares evidenced
by such Receipt may be refused until any such payment due is made, and any
dividends, interest payments or other distributions may be withheld or any part
of or all the shares of Preferred Stock or other property represented by the
Depositary Shares evidenced by such Receipt and not theretofore sold may be sold
for the account of the holder thereof (after attempting by reasonable means to
notify such holder prior to such sale), and such dividends, interest payments or
other distributions or the proceeds of any such sale may be applied to any
payment of such charges or expenses, the holder of such Receipt remaining liable
for any deficiency.

         SECTION 3.03.  Warranty as to Preferred Stock. The Company hereby
represents and warrants that the shares of Preferred Stock, when issued, will be
validly issued, fully paid and nonassessable. Such representation and warranty
shall survive the deposit of any shares of Preferred Stock and the issuance of
Receipts.

                                       -8-

<PAGE>

                                   ARTICLE IV

                        THE DEPOSITED SECURITIES; NOTICES

         SECTION 4.01.  Cash Distributions. Whenever the Depositary shall
receive any cash dividend or other cash distribution on deposited shares of
Preferred Stock, the Depositary shall, subject to Sections 3.01 and 3.02,
distribute to record holders of Receipts on the record date fixed pursuant to
Section 4.04 such amounts of such dividend or distribution as are, as nearly as
practicable, in proportion to the respective numbers of Depositary Shares
evidenced by the Receipts held by such holders; provided, however, that in case
the Company or the Depositary shall be required to withhold and shall withhold
from any cash dividend or other cash distribution in respect of the Preferred
Stock an amount on account of taxes, the amount made available for distribution
or distributed in respect of Depositary Shares shall be reduced accordingly. The
Depositary shall distribute or make available for distribution, as the case may
be, only such amount, however, as can be distributed without attributing to any
holder of Depositary Shares a fraction of one cent, and any balance not so
distributable shall be held by the Depositary (without liability for interest
thereon) and shall be added to and be treated as part of the next sum received
by the Depositary for distribution to record holders of Receipts then
outstanding.

         SECTION 4.02.  Distributions Other than Cash, Rights, Preferences or
Privileges. Whenever the Depositary shall receive any distribution other than
cash, rights, preferences or privileges upon deposited shares of Preferred
Stock, the Depositary shall, subject to Sections 3.01 and 3.02, distribute to
record holders of Receipts on the record date fixed pursuant to Section 4.04
such amounts of the securities or property received by it as are, as nearly as
practicable, in proportion to the respective numbers of Depositary Shares
evidenced by the Receipts held by such holders, in any manner that the
Depositary may deem equitable and practicable for accomplishing such
distribution. If in the opinion of the Depositary such distribution cannot be
made proportionately among such record holders, or if for any other reason
(including any requirement that the Company or the Depositary withhold an amount
on account of taxes) the Depositary deems, after consultation with the Company,
such distribution not to be feasible, the Depositary may, with the approval of
the Company, adopt such method as it deems equitable and practicable for the
purpose of effecting such distribution, including the sale (at public or private
sale) of the securities or property thus received, or any part thereof, at such
place or places and upon such terms as it may deem proper. The net proceeds of
any such sale shall, subject to Sections 3.01 and 3.02, be distributed or made
available for distribution, as the case may be, by the Depositary to record
holders of Receipts as provided by Section 4.01 in the case of a distribution
received in cash. The Company shall not make any distribution of such securities
unless the Company shall have provided an opinion of counsel stating that such
securities have been registered under the Securities Act of 1933 or do not need
to be registered.

         SECTION 4.03.  Subscription Rights, Preferences or Privileges. If
the Company shall at any time offer or cause to be offered to the persons in
whose names the shares of Preferred Stock are recorded on the books of the
Company any rights, preferences or privileges to subscribe for or to purchase
any securities or any rights, preferences or privileges of any other nature,
such rights, preferences or privileges shall in each such instance be made
available by the Depositary to the record holders of Receipts in such manner as
the Depositary may determine, either by the issue to such record holders of
warrants representing such rights, preferences or privileges or by such other
method as may be approved by the Depositary in its discretion with the approval
of the Company; provided, however, that (i) if at the time of issue or offer of
any such rights, preferences or privileges

                                       -9-

<PAGE>

the Depositary determines that it is not lawful or (after consultation with the
Company) not feasible to make such rights, preferences or privileges available
to holders of Receipts by the issue of warrants or otherwise, or (ii) if and to
the extent so instructed by holders of Receipts who do not desire to exercise
such rights, preferences or privileges, then the Depositary, in its discretion
(with the approval of the Company, in any case where the Depositary has
determined that it is not feasible to make such rights, preferences or
privileges available), may, if applicable laws and the terms of such rights,
preferences or privileges permit such transfer, sell such rights, preferences or
privileges at public or private sale, at such place or places and upon such
terms as it may deem proper. The net proceeds of any such sale shall, subject to
Sections 3.01 and 3.02, be distributed by the Depositary to the record holders
of Receipts entitled thereto as provided by Section 4.01 in the case of a
distribution received in cash. The Company shall not make any distribution of
any such rights, preferences or privilege unless the Company shall have provided
an opinion of counsel stating that such rights, preferences or privileges have
been registered under the Securities Act of 1933 or do not need to be
registered.

         If registration under the Securities Act of 1933 of the securities to
which any rights, preferences or privileges relate is required in order for
holders of Receipts to be offered or sold the securities to which such rights,
preferences or privileges relate, the Company agrees with the Depositary that it
will file promptly a registration statement pursuant to such Act with respect to
such rights, preferences or privileges and securities and use its best efforts
and take all steps available to it to cause such registration statement to
become effective sufficiently in advance of the expiration of such rights,
preferences or privileges to enable such holders to exercise such rights,
preferences or privileges. In no event shall the Depositary make available to
the holders of Receipts any right, preference or privilege to subscribe for or
to purchase any securities unless and until such a registration statement shall
have become effective, or unless the offering and sale of such securities to
such holders are exempt from registration under the provisions of such Act.

         If any other action under the laws of any jurisdiction or any
governmental or administrative authorization, consent or permit is required in
order for such rights, preferences or privileges to be made available to holders
of Receipts, the Company agrees with the Depositary that the Company will use
its best efforts to take such action or obtain such authorization, consent or
permit sufficiently in advance of the expiration of such rights, preferences or
privileges to enable such holders to exercise such rights, preferences or
privileges.

         SECTION 4.04.  Notice of Dividends, etc.; Fixing of Record Date for
Holders of Receipts. Whenever any cash dividend or other cash distribution shall
become payable or any distribution other than cash shall be made, or if rights,
preferences or privileges shall at any time be offered, with respect to the
Preferred Stock, or whenever the Depositary shall receive notice of any meeting
at which holders of shares of Preferred Stock are entitled to vote or of which
holders of shares of Preferred Stock are entitled to notice, or whenever the
Depositary and the Company shall decide it is appropriate, the Depositary shall
in each such instance fix a record date (which shall be the same date as the
record date fixed by the Company with respect to the Preferred Stock) for the
determination of the holders of Receipts who shall be entitled to receive such
dividend, distribution, rights, preferences or privileges or the net proceeds of
the sale thereof, or to give instructions for the exercise of voting rights at
any such meeting, or who shall be entitled to notice of such meeting or for any
other appropriate reasons.

         SECTION 4.05.  Voting Rights. Upon receipt of notice of any meeting
at which the holders of shares of Preferred Stock are entitled to vote, the
Depositary shall, as soon as practicable thereafter, mail to the record holders
of Receipts a notice which shall contain (i) such information as is contained in
such notice of meeting and (ii) a statement that the holders may, subject to any
applicable restrictions, instruct the Depositary as to the exercise of the
voting rights

                                      -10-

<PAGE>

pertaining to the number of shares of Preferred Stock represented by their
respective Depositary Shares (including an express indication that instructions
may be given to the Depositary to give a discretionary proxy to a person
designated by the Company) and a brief statement as to the manner in which such
instructions may be given. Upon the written request of the holders of Receipts
on the relevant record date, the Depositary shall endeavor insofar as
practicable to vote or cause to be voted, in accordance with the instructions
set forth in such requests, the maximum whole number of shares of Preferred
Stock represented by the Depositary Shares evidenced by all Receipts as to which
any particular voting instructions are received. The Company hereby agrees to
take all action which may be deemed necessary by the Depositary in order to
enable the Depositary to vote such shares of Preferred Stock or cause such
shares of Preferred Stock to be voted. In the absence of specific instructions
from the holder of a Receipt, the Depositary will abstain from voting (but, at
its discretion, not from appearing at any meeting with respect to such shares of
Preferred Stock unless directed to the contrary by the holders of all the
Receipts) to the extent of the number of shares of Preferred Stock represented
by the Depositary Shares evidenced by such Receipt.

         SECTION 4.06.  Changes Affecting Deposited Securities and
Reclassifications, Recapitalizations, etc. Upon any change in par or stated
value, split-up, combination or any other reclassification of the Preferred
Stock, or upon any recapitalization, reorganization, merger, amalgamation or
consolidation affecting the Company or to which it is a party, the Depositary
may in its discretion with the approval of, and shall upon the instructions of,
the Company, and (in either case) in such manner as the Depositary may deem
equitable, (i) make such adjustments as are certified by the Company in (x) the
fraction of any interest represented by one Depositary Share in one share of
Preferred Stock, and (y) the ratio of the redemption price per Depositary Share
to the redemption price per share of Preferred Stock, in each case as may be
necessary fully to reflect the effects of such changes in par or stated value,
split-up, combination or other reclassification of the Preferred Stock, or of
such recapitalization, reorganization, merger, amalgamation or consolidation,
and (ii) treat any securities which shall be received by the Depositary in
exchange for or upon conversion of or in respect of deposited shares of
Preferred Stock as new deposited securities so received in exchange for or upon
conversion or in respect of such shares of Preferred Stock. In any such case the
Depositary may in its discretion, with the approval of the Company, execute and
deliver additional Receipts, or may call for the surrender of all outstanding
Receipts to be exchanged for new Receipts specifically describing such new
deposited securities. Anything to the contrary herein notwithstanding, holders
of Receipts shall have the right from and after the effective date of any such
change in par or stated value, split-up, combination or other reclassification
of the Preferred Stock or any such recapitalization, reorganization, merger,
amalgamation or consolidation to surrender such Receipts to the Depositary with
instructions to convert, exchange or surrender the shares of Preferred Stock
represented thereby only into or for, as the case may be, the kind and amount of
shares of Preferred Stock and other securities and property and cash into which
the Preferred Stock represented by such Receipts might have been converted or
for which such Preferred Stock might have been exchanged or surrendered
immediately prior to the effective date of such transaction.

         SECTION 4.07.  Inspection of Reports. The Depository shall make
available for inspection by holders of Receipts at the Depositary's Office, and
at such other places as it may from time to time deem advisable, any reports and
communications received from the Company which are received by the Depositary as
the holder of Preferred Stock.

         SECTION 4.08.  Lists of Receipt Holders. Promptly upon request from
time to time by the Company, the Depositary shall furnish to it a list, as of a
recent date, of the names,

                                      -11-

<PAGE>

addresses and holdings of Depositary Shares of all persons in whose names
Receipts are registered on the books of the Depositary.

         SECTION 4.09.  Tax and Regulatory Compliance. The Depositary shall
be responsible for (i) preparation and mailing of form 1099s (or successor
forms) for all open and closed accounts, (ii) foreign tax withholding, (iii)
withholding of tax on dividends payable to eligible holders of Receipts, (iv)
mailing W-9 forms (or successor forms) to new holders of Receipts without a
certified taxpayer identification number, (v) processing certified W-9 forms (or
successor forms), (vi) preparation and filing of state information returns, and
(vii) escheatment services.

         SECTION 4.10.  Withholding. Notwithstanding any other provision of
this Deposit Agreement, in the event that the Depositary determines that any
distribution in property is subject to any tax that the Depositary is obligated
to withhold, the Depositary may, after consultation with the Company, dispose of
all or a portion of such property in such amounts and in such manner as the
Depositary deems necessary and practicable to pay such taxes, by public or
private sale at such place or places and upon such terms as it shall deem proper
after consultation with the Company, and the Depositary shall distribute the net
proceeds of any such sale or the balance of any such property after deduction of
such taxes to the holders of Receipts entitled thereto in proportion to the
number of Depositary Shares held by them respectively.

                                    ARTICLE V

                    THE DEPOSITARY, THE DEPOSITARY'S AGENTS,
                          THE REGISTRAR AND THE COMPANY

         SECTION 5.01.  Maintenance of Offices, Agencies and Transfer Books
by the Depositary; Registrar. The Depositary shall have its principal office in
the United States of America and shall have a combined capital and surplus of at
least $50,000,000. Upon execution of this Agreement, the Depositary shall
maintain at the Depositary's Office facilities for the execution and delivery,
registration and registration of transfer, surrender and exchange of Receipts,
and at the offices of the Depositary's Agents, if any, facilities for the
delivery, registration of transfer, surrender and exchange of Receipts, all in
accordance with the provisions of this Agreement.

         The Depositary shall keep books at the Depositary's Office for the
registration and registration of transfer of Receipts, which books at all
reasonable times shall be open for inspection by the record holders of Receipts;
provided, however, that any such holder requesting to exercise such right shall
certify to the Depositary that such inspection shall be for a proper purpose
reasonably related to such person's interests as an owner of Depositary Shares
evidenced by Receipts.

         The Depositary may close such books, at any time or from time to time,
when deemed expedient by it in connection with the performance of its duties
hereunder.

         If the Receipts or the Depositary Shares evidenced thereby or the
Preferred Stock represented by such Depositary Shares shall be listed on the New
York Stock Exchange, the Depositary may, with the approval of the Company,
appoint a Registrar for registration of such Receipts or Depositary Shares in
accordance with any requirements of such Exchange. Such Registrar (which may be
the Depositary if so permitted by the requirements of such Exchange)

                                      -12-

<PAGE>

may be removed and a substituted registrar appointed by the Depositary upon the
request or with the approval of the Company. If the Receipts, the Depositary
Shares or the Preferred Stock shall be listed on one or more other stock
exchanges, the Depositary will, at the request of the Company, arrange such
facilities for the delivery, registration, registration of transfer, surrender
and exchange of the Receipts, the Depositary Shares or the Preferred Stock as
may be required by law or applicable stock exchange regulation.

         SECTION 5.02.  Prevention of or Delay in Performance by the
Depositary, the Depositary's Agents, the Registrar or the Company. Neither the
Depositary nor any Depositary's Agent nor any Registrar nor the Company shall
incur any liability to any holder of a Receipt if by reason of any provision of
any present or future law, or regulation thereunder, of the United States of
America or of any other governmental authority or, in the case of the
Depositary, the Depositary's Agent or the Registrar, by reason of any provision,
present or future, of the Company's Articles of Incorporation (including the
Certificate) or by reason of any act of God or war or other circumstance beyond
the control of the relevant party, the Depositary, the Depositary's Agent, the
Registrar or the Company shall be prevented or forbidden from, or subjected to
any penalty on account of, doing or performing any act or thing which the terms
of this Agreement provide shall be done or performed; nor shall the Depositary,
any Depositary's Agent, any Registrar or the Company incur any liability to any
holder of a Receipt (i) by reason of any nonperformance or delay, caused as
aforesaid, in the performance of any act or thing which the terms of this
Deposit Agreement provide shall or may be done or performed or (ii) by reason of
any exercise of, or failure to exercise, any discretion provided for in this
Agreement except, in case of any such exercise or failure to exercise discretion
not caused as aforesaid, if caused by the negligence or willful misconduct of
the party charged with such exercise or failure to exercise.

         SECTION 5.03.  Obligations of the Depositary, the Depositary's
Agents, the Registrar and the Company. Neither the Depositary nor any
Depositary's Agent nor any Registrar nor the Company assumes any obligation or
shall be subject to any liability under this Agreement to holders of Receipts
other than for its negligence or willful misconduct.

         Neither the Depositary nor any Depositary's Agent nor any Registrar nor
the Company shall be under any obligation under this Agreement to appear in,
prosecute or defend any action, suit or other proceeding in respect of deposited
shares of Preferred Stock, the Depositary Shares or the Receipts that in its
opinion may involve it in expense or liability unless indemnity satisfactory to
it against all expense and liability be furnished as often as may be required.

         Neither the Depositary nor any Depositary's Agent nor any Registrar nor
the Company shall be liable for any action or any failure to act by it in
reliance upon the written advice of legal counsel or accountants, or information
from any person presenting shares of Preferred Stock for deposit, any holder of
a Receipt or any other person believed by it in good faith to be competent to
give such information. The Depositary, any Depositary's Agent, any Registrar and
the Company may each rely and shall each be protected in acting upon any written
notice, request, direction or other document believed by it to be genuine and to
have been signed or presented by the proper party or parties.

         Notwithstanding the first paragraph of this Section, the Depositary
shall not be responsible for any failure to carry out any instruction to vote
any of the deposited shares of Preferred Stock or for the manner or effect of
any such vote made, as long as any such action or nonaction is in good faith or
in accordance with this Agreement. The Depositary undertakes, and

                                      -13-

<PAGE>

any Registrar shall be required to undertake, to perform such duties and only
such duties as are specifically set forth in this Deposit Agreement, and no
implied covenants or obligations shall be read into this Deposit Agreement
against the Depositary or any Registrar. The Depositary will indemnify the
Company against any liability that may arise out of acts performed or omitted by
the Depositary or its agents due to its or their negligence or bad faith. The
Depositary, the Depositary's Agents and any Registrar may own and deal in any
class of securities of the Company and its affiliates and Receipts. The
Depositary may also act as transfer agent or registrar of any of the securities
of the Company and its affiliates.

         SECTION 5.04.  Resignation and Removal of the Depositary;
Appointment of Successor Depositary. The Depositary may at any time resign as
Depositary hereunder by notice of its election to do so delivered to the
Company, such resignation to take effect upon the appointment of a successor
Depositary and its acceptance of such appointment as hereinafter provided.

         The Depository may at any time be removed by the Company by notice of
such removal delivered to the Depositary, such removal to take effect upon the
appointment of a successor Depositary and its acceptance of such appointment as
hereinafter provided.

         In case at any time the Depositary acting hereunder shall resign or be
removed, the Company shall, within 60 days after the delivery of the notice of
resignation or removal, as the case may be, appoint a successor Depositary,
which shall be a bank or trust company having its principal office in the United
States of America and having a combined capital and surplus of at least
$50,000,000. If no successor Depositary shall have been so appointed and have
accepted appointment within 60 days after delivery of such notice, the resigning
or removed Depositary may petition any court of competent jurisdiction for the
appointment of a successor Depositary. Every successor Depositary shall execute
and deliver to its predecessor and to the Company an instrument in writing
accepting its appointment hereunder, and thereupon such successor Depositary,
without any further act or deed, shall become fully vested with all the rights,
powers, duties and obligations of its predecessor and for all purposes shall be
the Depositary under this Agreement, and such predecessor, upon payment of all
sums due it and on the written request of the Company, shall execute and deliver
an instrument transferring to such successor all rights and powers of such
predecessor hereunder, shall duly assign, transfer and deliver all right, title
and interest in the Preferred Stock and any moneys or property held hereunder to
such successor, and shall deliver to such successor a list of the record holders
of all outstanding Receipts. Any successor Depositary shall promptly mail notice
of its appointment to the record holders of Receipts.

         Any corporation into or with which the Depositary may be merged,
consolidated or converted shall be the successor of such Depositary without the
execution or filing of any document or any further act, and notice thereof shall
not be required hereunder. Such successor Depositary may authenticate the
Receipts in the name of the predecessor Depositary or in the name of the
successor Depositary.

                                      -14-

<PAGE>

         SECTION 5.05.  Corporate Notices and Reports. The Company agrees
that it will transmit to the record holders of Receipts, in each case at the
addresses furnished to it pursuant to Section 4.08, all notices and reports
(including without limitation financial statements) required by law, by the
rules of any national securities exchange upon which the Preferred Stock, the
Depositary Shares or the Receipts are listed or by the Company's Articles of
Incorporation (including the Certificate) to be furnished by the Company to
holders of shares of Preferred Stock. Such transmission will be at the Company's
expense.

         SECTION 5.06.  Indemnification by the Company. The Company shall
indemnify the Depositary, any Depositary's Agent and any Registrar against, and
hold each of them harmless from, any loss, liability or expense (including the
costs and expenses of defending itself) that may arise out of (i) acts performed
or omitted in connection with this Deposit Agreement and the Receipts (a) by the
Depositary, any Registrar or any of their respective agents (including any
Depositary's Agent), except for any liability arising out of negligence or bad
faith on the respective parts of any such person or persons, or (b) by the
Company or any of its agents, or (ii) the offer, sale or registration of the
Receipts or the Preferred Stock pursuant to the provisions hereof. The
obligations of the Company set forth in this Section 5.06 shall survive any
succession of any Depositary, Registrar or Depositary's Agent.

         SECTION 5.07.  Charges and Expenses. The Company shall pay all
transfer and other taxes and governmental charges in connection with the
existence of the depositary arrangements. The Company shall pay all charges of
the Depositary in connection with the initial deposit of the Preferred Stock and
the initial issuance of the Depositary Shares and redemption of the Preferred
Stock at the option of the Company. All other transfer and other taxes and
governmental charges shall be at the expense of holders of Depositary Shares.
If, at the request of a holder of Receipts, the Depositary incurs charges or
expenses for which it is not otherwise liable hereunder, such holder will be
liable for such charges and expenses. All other charges and expenses of the
Depositary and any Depositary's Agent hereunder and of any Registrar (including,
in each case, fees and expenses of counsel) incident to the performance of their
respective obligations hereunder will be paid upon consultation and agreement
between the Depositary and the Company as to the amount and nature of such
charges and expenses. The Depositary shall present its statement for charges and
expenses to the Company once every three months or at such other intervals as
the Company and the Depositary may agree.

                                   ARTICLE VI

                            AMENDMENT AND TERMINATION

         SECTION 6.01.  Amendment. The form of the Receipts and any
provisions of this Agreement may at any time and from time to time be amended by
agreement between the Company and the Depositary in any respect which they may
deem necessary or desirable; provided, however, that no such amendment that
shall materially and adversely alter the rights of the holders of Receipts shall
be effective unless such amendment shall have been approved by the holders of at
least a majority of the Depositary Shares then outstanding. Every holder of an
outstanding Receipt at the time any such amendment becomes effective shall be
deemed, by continuing to hold such Receipt, to consent and agree to such
amendment and to be bound by this Agreement as amended thereby.

         SECTION 6.02.  Termination. This Agreement may be terminated by the
Company or the Depositary only after (i) all outstanding Depositary Shares shall
have been

                                      -15-

<PAGE>

redeemed pursuant to Section 2.03; (ii) there shall have been made a final
distribution in respect of the Preferred Stock in connection with any
liquidation, dissolution or winding up of the Company and such distribution
shall have been distributed to the holders of Depositary Shares pursuant to
Section 4.01 or Section 4.02, as applicable; (iii) all outstanding Depositary
Shares shall have been converted into or exchanged for other securities; and
(iv) upon determination by the Company to terminate this Agreement. In the case
of a termination pursuant to (iv) above, the Depositary shall give notice or
termination to the holders of Depositary Shares not less than 30 days before the
termination date; and further, every holder shall upon surrender of its
Depositary Receipts to the Depositary be entitled to receive from the Depositary
the number of whole or fractional shares of the series of Preferred Stock that
such Depositary Receipts relate to.

         Upon the termination of this Agreement, the Company shall be discharged
from all obligations under this Deposit Agreement except for its obligations to
the Depositary, any Depositary's Agent and any Registrar under Sections 5.06 and
5.07. The Depositary's indemnity under Section 5.03 shall survive the
termination of this Agreement and the resignation or removal of such Depositary.

                                   ARTICLE VII

                                  MISCELLANEOUS

         SECTION 7.01.  Counterparts. This Agreement may be executed in any
number of counterparts, and by each of the parties hereto on separate
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed an original, but all such counterparts taken together shall constitute
one and the same instrument.

         SECTION 7.02.  Exclusive Benefit of Parties. This Agreement is for the
exclusive benefit of the parties hereto, and their respective successors
hereunder, and shall not be deemed to give any legal or equitable right, remedy
or claim to any other person whatsoever.

         SECTION 7.03.  Invalidity of Provisions. In case any one or more of
the provisions contained in this Agreement or in the Receipts should be or
become invalid, illegal or unenforceable in any respect, the validity, legality
and enforceability of the remaining provisions contained herein or therein shall
in no way be affected, prejudiced or disturbed thereby.

         SECTION 7.04.  Notices. Any and all notices to be given to the
Company hereunder or under the Receipts shall be in writing and shall be deemed
to have been duly given if personally delivered or sent by mail or by telegram
or telex confirmed by letter, addressed to the Company at 175 E. Houston Street,
San Antonio, Texas 78205 to the attention of the Secretary, or at any other
address of which the Company shall have notified the Depositary in writing.

         Any and all notices to be given to the Depositary hereunder or under
the Receipts shall be in writing and shall be deemed to have been duly given if
personally delivered or sent by mail or by telegram or telex confirmed by
letter, addressed to the Depositary at the Depositary's Office, at [ADDRESS OF
DEPOSITARY], or at any other address of which the Depositary shall have notified
the Company in writing.

         Any and all notices to be given to any record holder of a Receipt
hereunder or under the Receipts shall be in writing and shall be deemed to have
been duly given if personally

                                      -16-

<PAGE>

delivered or sent by mail or by telegram or telex confirmed by letter, addressed
to such record holder at the address of such record holder as it appears on the
books of the Depositary, or if such holder shall have filed with the Depositary
a written request that notices intended for such holder be mailed to some other
address, at the address designated in such request.

         Delivery of a notice sent by mail or by telegram or telex shall be
deemed to be effected at the time when a duly addressed letter containing the
same (or a confirmation thereof in the case of a telegram or telex message) is
deposited, postage prepaid, in a post office letter box. The Depositary or the
Company may, however, act upon any telegram or telex message received by it from
the other or from any holder of a Receipt, notwithstanding that such telegram or
telex message shall not subsequently be confirmed by letter or as aforesaid.

         SECTION 7.05.  Depositary's Agents. The Depositary may from time to
time appoint Depositary's Agents to act in any respect for the Depositary for
the purposes of this Agreement and may at any time appoint additional
Depositary's Agents and vary or terminate the appointment of such Depositary's
Agents. The Depositary will notify the Company of any such action.

         SECTION 7.06.  Holders of Receipts Are Parties. The holders of
Receipts from time to time shall be parties to this Agreement and shall be bound
by all of the terms and conditions hereof and of the Receipts by acceptance of
delivery thereof.

         SECTION 7.07.  Governing Law. This Agreement and the Receipts and
all rights hereunder and thereunder and provisions hereof and thereof shall be
governed by, and construed in accordance with, the laws of the State of
Delaware.

         SECTION 7.08.  Inspection of Agreement. Copies of this Agreement
shall be filed with the Depositary and the Depositary's Agents and shall be open
to inspection during business hours at the Depositary's Office and the
respective offices of the Depositary's Agents, if any, by an holder of a
Receipt.

         SECTION 7.09.  Headings. The headings of articles and sections in
this Agreement and in the form of the Receipt set forth in Exhibit A hereto have
been inserted for convenience only and are not to be regarded as a part of this
Agreement or the Receipts or have any bearing upon the meaning or interpretation
of any provision contained herein or in the Receipts.

                                      -17-

<PAGE>

         IN WITNESS WHEREOF, the Company and the Depositary have duly executed
this Agreement as of the day and year first above set forth, and all holders of
Receipts shall become parties hereto by and upon acceptance by them of delivery
of Receipts issued in accordance with the terms hereof.

                                              SBC COMMUNICATIONS INC.

Attested by                                   By
                                                 -------------------
-------------------
[SEAL]

                                              [NAME OF DEPOSITARY], as
                                              Depositary

Attested by                                   By
                                                 -------------------
-------------------
[SEAL]

                                      -18-

<PAGE>

                                                                       EXHIBIT A

                          [FORM OF DEPOSITARY RECEIPT]

CERTIFICATE FOR NOT MORE THAN ______________________DEPOSITARY SHARES

                    DEPOSITARY RECEIPT FOR DEPOSITARY SHARES,
                   REPRESENTING PREFERRED STOCK, SERIES ___ OF

                             SBC COMMUNICATIONS INC.
              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

Serial Number _______                        Number of Depositary Shares ______

____________________, as Depositary (the "Depositary"), hereby certifies that
____________________ is the registered owner of _______________________________
DEPOSITARY SHARES ("Depositary Shares"), each Depositary Share representing
[____] of Preferred Stock, Series ___, $1 par value of SBC Communications Inc.,
a Delaware corporation (the "Corporation"), on deposit with the Depositary,
subject to the terms and entitled to the benefits of the Deposit Agreement dated
as of _______,2000, (the "Deposit Agreement") between the Corporation and the
Depositary. By accepting this Receipt the holder hereof becomes a party to and
agrees to be bound by all the terms and conditions of the Deposit Agreement.
This Receipt shall not be valid or obligatory for any purpose or entitled to any
benefits under the Deposit Agreement unless it shall have been executed by the
Depositary by the manual signature of a duly authorized officer and shall have
been countersigned manually by a Registrar or by the Depositary as Registrar in
respect of the Receipts by the manual signature of a duly authorized officer
thereof.

Dated:
       ----------------
COUNTERSIGNED AND REGISTERED:

-----------------------------
DEPOSITARY AND REGISTRAR

By:
   -----------------------
    Authorized Officer

<PAGE>

                     [REVERSE OF FORM OF DEPOSITARY RECEIPT]

                             SBC COMMUNICATIONS INC.

         SBC COMMUNICATIONS INC. WILL FURNISH WITHOUT CHARGE TO EACH
RECEIPTHOLDER WHO SO REQUESTS A COPY OF THE DEPOSIT AGREEMENT AND A STATEMENT OR
SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING,
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF WHICH
THE CORPORATION IS AUTHORIZED TO ISSUE AND OF THE QUALIFICATIONS, LIMITATIONS OR
RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS. ANY SUCH REQUEST IS TO BE
ADDRESSED TO THE DEPOITARY NAMED ON THE FACE OF THIS RECEIPT.

    The following abbreviations, when used in the inscription on the face of
this receipt, shall be construed as though they were written out in full
according to applicable laws or regulations:

         TEN COM           -       as tenants in common

         TEN ENT           -       as tenants by the entireties

         JT TEN            -       as joint tenants with right of survivorship
                                   and not as tenants in common

    Additional abbreviations may also be used though not in the above list.

    For value received, _____________________________________ hereby sell(s),
assign(s), and transfer(s) unto

                         -------------------------
                         (Name)
                         -------------------------
                         (Address)
                         -------------------------
                         (Address)
                         -------------------------
                         (City, State, Zip Code)

Depositary Shares represented by this Receipt, and do hereby irrevocably
constitute and appoint _____________ to transfer the said Depositary Shares on
the books of the above named Depositary with full power of substitution in the
premises.

Dated :
        ---------------------

                  NOTICE: The signature to this assignment must
                  correspond with the name as written upon the face of
                  this Receipt in every particular, without alteration
                  or enlargement or any change whatever.<PAGE>

                                                                    EXHIBIT 10.1

                          AGREEMENT AND PLAN OF MERGER

                                     AMONG

                              ZYDECO ENERGY, INC.

             DVN Acquisition Corporation, a Texas corporation; and

                                  DATAVON INC.

                                  DATED AS OF

                                  MAY 23, 2000
<PAGE>

<TABLE>
<CAPTION>
                                                        TABLE OF CONTENTS
                                                                                                                        Page
                                                                                                                        ----
<S>                              <C>                                                                                     <C>
RECITALS                         .....................................................................................    1
ARTICLE 1                    DEFINITIONS..............................................................................    1
ARTICLE 2                    THE MERGER...............................................................................    7
     Section 2.01                Basic Transaction....................................................................    7
     Section 2.02                Effective Time; Closing..............................................................    7
     Section 2.03                Effect of the Merger.................................................................    7
     Section 2.04                Articles of Incorporation; Bylaws....................................................    7
     Section 2.05                Directors and Officers...............................................................    7
     Section 2.06                Conversion of Securities.............................................................    8
     Section 2.07                Exchange of Certificates.............................................................    8
     Section 2.08                Stock Transfer Books.................................................................   10
     Section 2.09                Stock Options........................................................................   10
ARTICLE 3                    REPRESENTATIONS AND WARRANTIES OF DATAVON................................................   10
     Section 3.01                Organization, Qualification and Corporate Power......................................   10
     Section 3.02                Noncontravention.....................................................................   11
     Section 3.03                Capitalization.......................................................................   11
     Section 3.04                Brokers' Fees........................................................................   11
     Section 3.05                Title to Assets......................................................................   11
     Section 3.06                Subsidiaries.........................................................................   11
     Section 3.07                Financial Statements.................................................................   12
     Section 3.08                Undisclosed Liabilities..............................................................   12
     Section 3.09                Legal Compliance.....................................................................   13
     Section 3.10                Real Property........................................................................   13
     Section 3.11                Tangible Assets......................................................................   13
     Section 3.12                Powers of Attorney...................................................................   13
     Section 3.13                Insurance............................................................................   13
     Section 3.14                Litigation...........................................................................   13
     Section 3.15                Employees............................................................................   14
     Section 3.16                Guaranties...........................................................................   14
     Section 3.17                Certain Business Practices...........................................................   14
     Section 3.18                Parachute Payments...................................................................   14
     Section 3.19                Disclosure...........................................................................   14
ARTICLE 4                    REPRESENTATIONS AND WARRANTIES CONCERNING ZYDECO AND ITS SUBSIDIARIES....................   14
     Section 4.01                Organization, Qualification, and Corporate Power.....................................   14
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>

<S>                              <C>                                                                                     <C>
     Section 4.02                Capitalization.......................................................................   15
     Section 4.03                Noncontravention.....................................................................   15
     Section 4.04                Brokers' Fees........................................................................   15
     Section 4.05                Title to Assets......................................................................   16
     Section 4.06                Subsidiaries.........................................................................   16
     Section 4.07                SEC Filings; Financial Statements....................................................   16
     Section 4.08                Absence of Certain Changes or Events.................................................   17
     Section 4.09                Undisclosed Liabilities..............................................................   18
     Section 4.10                Legal Compliance.....................................................................   18
     Section 4.11                Tax Matters..........................................................................   19
     Section 4.12                Real Property Other Than Oil and Gas Interests.   20
     Section 4.13                Title to Oil and Gas Interests.......................................................   20
     Section 4.14                Oil and Gas Interests of Zydeco and its Subsidiaries   21
     Section 4.15                Wells................................................................................   21
     Section 4.16                Refund...............................................................................   21
     Section 4.17                Operation of Assets..................................................................   21
     Section 4.18                Intellectual Property................................................................   21
     Section 4.19                Tangible Assets......................................................................   22
     Section 4.20                Contracts............................................................................   22
     Section 4.21                Notes and Accounts Receivable........................................................   23
     Section 4.22                Powers of Attorney...................................................................   23
     Section 4.23                Insurance............................................................................   23
     Section 4.24                Litigation...........................................................................   23
     Section 4.25                Employees............................................................................   24
     Section 4.26                Employee Benefits....................................................................   24
     Section 4.27                Guaranties...........................................................................   24
     Section 4.28                Environment, Health, and Safety......................................................   24
     Section 4.29                Certain Business Relationships With Zydeco...........................................   25
     Section 4.30                Change of Control....................................................................   25
     Section 4.31                Certain Business Practices...........................................................   25
     Section 4.32                Parachute Payments...................................................................   26
     Section 4.33                Information Statement................................................................   26
     Section 4.34                Disclosure...........................................................................   26
ARTICLE 5                    PRE-CLOSING COVENANTS....................................................................   26
     Section 5.01                General..............................................................................   26
     Section 5.02                Notices and Consents.................................................................   26
</TABLE>

                                      ii
<PAGE>

<TABLE>
<CAPTION>

<S>                              <C>                                                                                     <C>
     Section 5.03                Operation of Business................................................................   26
     Section 5.04                Preservation of Business.............................................................   26
     Section 5.05                Full Access..........................................................................   26
     Section 5.06                Notice of Developments...............................................................   27
     Section 5.07                Exclusivity..........................................................................   27
     Section 5.08                Filing of Current Report on Form 8-K.................................................   29
     Section 5.09                Composition of Zydeco and Surviving Corporation Board and Officers at Effective Time.   29
     Section 5.10                Information Statement................................................................   29
     Section 5.11                Section 16(b) Board Approval.........................................................   29
     Section 5.12                Confidentiality......................................................................   29
     Section 5.13                Restructuring of Exploration.........................................................   30
     Section 5.14                Filing of Certificate of Designations................................................   30
ARTICLE 6                    POST-CLOSING COVENANTS...................................................................   30
     Section 6.01                General..............................................................................   30
     Section 6.02                Transition...........................................................................   30
     Section 6.03                Tax Payment..........................................................................   30
     Section 6.04                Restrictions on Certain Intercompany Transactions....................................   30
ARTICLE 7                    CONDITIONS TO OBLIGATION TO CLOSE........................................................   31
     Section 7.01                Conditions to Obligation of DataVon..................................................   31
     Section 7.02                Conditions to Obligation of Zydeco...................................................   32
ARTICLE 8                    TERMINATION..............................................................................   33
     Section 8.01                Termination of Agreement.............................................................   33
     Section 8.02                Effect of Termination................................................................   33
ARTICLE 9                    MISCELLANEOUS............................................................................   33
     Section 9.01                Press Releases and Public Announcements..............................................   33
     Section 9.02                No Third Party Beneficiaries.........................................................   34
     Section 9.03                Entire Agreement.....................................................................   34
     Section 9.04                Succession and Assignment............................................................   34
     Section 9.05                Counterparts.........................................................................   34
     Section 9.06                Headings.............................................................................   34
     Section 9.07                Notices..............................................................................   34
     Section 9.08                Governing Law........................................................................   35
     Section 9.09                Amendments and Waivers...............................................................   35
     Section 9.10                Severability.........................................................................   35
     Section 9.11                Expenses.............................................................................   35
</TABLE>

                                      iii
<PAGE>

<TABLE>
<CAPTION>
<S>                              <C>                                                                                     <C>
     Section 9.12                Construction.........................................................................   35
     Section 9.13                Incorporation of Exhibits and Schedules..............................................   35
     Section 9.14                Specific Performance.................................................................   35
     Section 9.15                Submission to Jurisdiction...........................................................   35
     Section 9.16                Survival.............................................................................   36

</TABLE>

                                      iv
<PAGE>

DataVon Disclosure Schedule
Zydeco Disclosure Schedule

Exhibit A  Form of Articles of Merger
Exhibit B  Form of Tax Opinion of Zydeco's Counsel or Tax Accountants
Exhibit C  Form of Opinion of Zydeco's Counsel
Exhibit D  Form of Certificate of Designations
Exhibit E  Directors and Officers of Zydeco as of the Effective Time

                                       v
<PAGE>

                          AGREEMENT AND PLAN OF MERGER

     This AGREEMENT AND PLAN OF MERGER ("Agreement") entered into as of May 23,
2000, by and among Zydeco Energy, Inc., a Delaware corporation ("Zydeco"),
DataVoN Inc., a Texas corporation ("DataVon"), and DVN Acquisition Corporation,
a Texas corporation and a wholly owned subsidiary of Zydeco ("Zydeco Sub").
Zydeco, DataVon and Zydeco Sub are referred to collectively herein as the
"Parties."

                                    RECITALS

     A.  Zydeco Sub, upon the terms and subject to the conditions of this
Agreement and in accordance with the applicable sections of the Texas Business
Corporation Act ("Texas Law"), will merge with and into DataVon (the "Merger").

     B.  The Board of Directors of DataVon has determined that the Merger is in
the best interests of DataVon, has approved and adopted this Agreement and the
transactions contemplated hereby, and recommended adoption of this Agreement by
the stockholders of DataVon.

     C.  The Board of Directors of Zydeco and Zydeco Sub have approved and
adopted this Agreement and the transactions contemplated hereby, and the Board
of Directors of Zydeco Sub has recommended adoption of this Agreement to the
sole stockholder of Zydeco Sub.

     D.  For federal Income Tax purposes, it is intended that the Merger will
qualify as a tax-free reorganization under the provisions of Section 368(a) of
the Code (as defined below).

     NOW, THEREFORE, in consideration of the premises and the mutual promises
herein made, and in consideration of the representations, warranties, and
covenants herein contained, the Parties agree as follows.

                                   ARTICLE 1

                                  DEFINITIONS

     "Affiliate" has the meaning set forth in Rule 12b-2 of the regulations
promulgated under the Securities Exchange Act.

     "Affiliated Group" means any affiliated group within the meaning of Code
Section 1504 or any similar group defined under a similar provision of state,
local, or foreign law.

     "Agreement" has the meaning set forth in the preface above.

     "Articles of Merger" has the meaning set forth in Section 2.02.

     "Business Day" means a day of the year in which banks are not required or
authorized to be closed in the City of Houston.

     "CERCLA" means the United States Comprehensive Environmental Response,
Compensation, and Liability Act.

     "Certificates" has the meaning set forth in Section 2.07.

     "Cleanup" means any investigative, monitoring, cleanup, removal,
containment or other remedial or response action required by any Environmental
Law or Occupational Safety and Health Law.  The terms "removal," "remedial," and
"response action" include the types of activities covered by CERCLA.

     "Closing" has the meaning set forth in Section 2.02.

                                       1
<PAGE>

     "Closing Date" has the meaning set forth in Section 2.02.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Confidential Information" means any information concerning the businesses
and affairs of DataVon that is not already generally available to the public.

     "Contravene" - an act or omission would "Contravene" something if, as the
context requires:

          (i)    the act or omission would conflict with it, violate it,
     result in a breach or violation of or failure to comply with it, or
     constitute a default under it;

          (ii)   the act or omission would give any Governmental Body or
     other Person the right to challenge, revoke, withdraw, suspend, cancel,
     terminate, or modify it, to exercise any remedy or obtain any relief under
     it, or to declare a default or accelerate the maturity of any obligation
     under it; or

          (iii)  the act or omission would result in the creation of an
     Encumbrance on the stock or assets of the subject company.

     "Controlled Group of Corporations" has the meaning set forth in Code
Section 1563.

     "DataVon" has the meaning set forth in the preface above.

     "DataVon Audited Statements" shall mean DataVon's audited financial
statements as of and for the period ended December 31, 1999.

     "DataVon Disclosure Schedule" has the meaning set forth in Article 3.

     "DataVon Shares" means the common stock, no par value, of DataVon.

     "DataVon Stockholder" means Mr. Hugh Simpson.

     "Deferred Intercompany Transaction" has the meaning set forth in Regulation
Section 1.1502-13.

     "Delaware Law" means Delaware General Corporation Law.

     "Effective Time" has the meaning set forth in Section 2.02.

     "Employee Benefit Plan" means any (a) nonqualified deferred compensation or
retirement plan or arrangement which is an Employee Pension Benefit Plan, (b)
qualified defined contribution retirement plan or arrangement which is an
Employee Pension Benefit Plan, (c) qualified defined benefit retirement plan or
arrangement which is an Employee Pension Benefit Plan (including any
Multiemployer Plan), or (d) Employee Welfare Benefit Plan, cafeteria plan as
defined in Section 125 of the Code, or material fringe benefit plan or program.

     "Employee Pension Benefit Plan" has the meaning set forth in ERISA Section
3(2).

     "Employee Welfare Benefit Plan" has the meaning set forth in ERISA Section
3(1).

     "Encumbrance" means any charge, claim, mortgage, servitude, easement, right
of way, community or other marital property interest, covenant, equitable
interest, lien, option, pledge, security interest, preference, priority, right
of first refusal, or similar restriction.

                                       2
<PAGE>

     "Environment" means soil, land surface or subsurface strata, surface waters
(including navigable water and ocean waters), groundwaters, drinking water
supply, stream sediments, ambient air (including indoor air), plant and animal
life, and any other similar medium or natural resource.

     "Environmental, Health, and Safety Liabilities" means any cost, damages,
expense, Liability, or other responsibility arising from or under Environmental
Law or Occupational Safety and Health Law, including those consisting of or
relating to:

          (i)     any environmental, health, or safety matter or condition
     (including on-site or off-site contamination, occupational safety and
     health, and regulation of any chemical substance or product);

          (ii)    any fine, penalty, judgment, award, settlement, proceeding,
     damages, loss, claim, demand and response, investigative, monitoring,
     remedial, or inspection cost or expense arising under Environmental Law or
     Occupational Safety and Health Law;

          (iii)   financial responsibility under any Environmental Law or
     Occupational Safety and Health Law for Cleanup costs or corrective action,
     (whether or not such Cleanup has been required or requested by any
     Governmental Body or other Person) and for any natural resource damage; or

          (iv)    any other compliance, corrective, or remedial measures
     required under any Environmental Law or Occupational Safety and Health Law.

     "Environmental Law" means CERCLA and any other Legal Requirement that
requires or relates to:

          (i)     advising appropriate Governmental Bodies, employees, or the
     public of intended or actual Releases of pollutants or hazardous substances
     or materials, violations of discharge limits or other prohibitions and the
     commencement of activities, such as resource extraction or construction,
     that could have significant impact on the Environment;

          (ii)    preventing or reducing to acceptable levels the Release of
     pollutants or hazardous substances or materials into the Environment;

          (iii)   reducing the quantities, preventing the Release, or minimizing
     the hazardous characteristics of wastes that are generated;

          (iv)    assuring that products are designed, formulated, packaged,
     and used so that they do not present unreasonable risks to human health or
     the Environment when used or disposed of;

          (v)     protecting resources, species, or ecological amenities;

          (vi)    reducing to acceptable levels the risks inherent in the
     transportation of hazardous substances, pollutants, oil, or other
     potentially harmful substances;

          (vii)   Cleanup of pollutants that have been Released, preventing
     the threat of Release, or paying the costs of such Cleanup or prevention;
     or

          (viii)  making responsible parties pay private parties, or groups
     of them, for damages done to their health or the Environment, or permitting
     self-appointed representatives of the public interest to recover for
     injuries done to public assets.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

     "Exploration" means Zydeco Exploration, Inc., a wholly-owned direct
Subsidiary of Zydeco.

                                       3
<PAGE>

     "Facility" means any Real Property or tangible personal property interest
owned or operated by Zydeco or its Subsidiaries.  For purposes of Section 4.28
and the definition of "Hazardous Activity," the term also includes any Real
Property or tangible personal property interest formerly owned or operated by
Zydeco or its Subsidiaries or any predecessor Person.

     "Fiduciary" has the meaning set forth in ERISA Section 3(21).

     "GAAP" means United States generally accepted accounting principles as in
effect from time to time.

     "Good Title" means good and defensible title which is (i) evidenced by an
instrument or instruments filed of record in accordance with the conveyance and
recording laws of the applicable jurisdiction and is sufficient against
competing claims of bona fide purchasers for value without notice and (ii) free
and clear of all liens, security interest, claims, infringements, and other
burdens of encumbrances, other than such liens, security interests, claims,
infringements, and other burdens of encumbrances that a reasonably prudent
purchaser of oil and gas properties would accept in light of the value of the
property affected, the improbability of assertion of the defect or irregularity
or the degree of difficulty or the cost of performing curative work.

     "Governmental Body" means any:

          (i)    nation, region, state, county, city, town, village, district,
     or other jurisdiction;

          (ii)   federal, state, local, municipal, foreign or other
     government;

          (iii)  governmental or quasi-governmental authority of any nature
     (including any governmental agency, branch, department, or other entity and
     any court or other tribunal);

          (iv)   multinational organization ;

          (v)    body exercising, or entitled to exercise, any administrative,
     executive, judicial, legislative, policy, regulatory, or taxing authority
     or power of any nature; and

          (vi)   official of any of the foregoing.

     "Hazardous Activity" means the distribution, generation, handling,
importing, management, manufacturing, processing, production, refinement,
Release, storage, transfer, transportation, treatment, or use (including any
withdrawal or other use of groundwater) of Hazardous Materials in, on, under,
about, or from any of the Facilities or any part thereof into the Environment,
and any other act, business, operation, or thing that increases the danger, or
risk of danger, or poses an unreasonable risk of harm to individuals or property
on or off the Facilities, or that may affect the value of any of the Facilities
or Zydeco and its Subsidiaries.

     "Hazardous Materials" means any waste or other substance that is listed,
defined, designated, or classified as, or otherwise determined to be, hazardous,
radioactive, or toxic or a pollutant or a contaminant under or pursuant to any
Environmental Law, including any admixture or solution thereof, and specifically
including petroleum and all derivatives thereof or synthetic substitutes
therefor and asbestos or asbestos-containing materials.

     "Income Taxes" means all income and profits Taxes, capital taxes, franchise
taxes and similar Taxes based on income, profits or capital (including any Taxes
in lieu of such income or profits Taxes) imposed by any Federal, state, local or
foreign governmental agency, whether in the form of assessments in the nature of
Taxes or otherwise, together with all interest, penalties and additions imposed
with respect to (a) such Taxes or (b) the late filing or nonfiling of returns
relating to such Taxes.

     "Information Statement" has the meaning set forth in Section 4.33.

                                       4
<PAGE>

     "Intellectual Property" means (a) all inventions (whether patentable or
unpatentable and whether or not reduced to practice), all improvements thereto,
and all patents, patent applications, and patent disclosures, together with all
reissuances, continuations, continuations-in-part, revisions, extensions, and
reexaminations thereof, (b) all trademarks, service marks, trade dress, logos,
trade names, and corporate names, together with all translations, adaptations,
derivations, and combinations thereof and including all goodwill associated
therewith, and all applications, registrations, and renewals in connection
therewith, (c) all copyrightable works, all copyrights, and all applications,
registrations, and renewals in connection therewith, (d) all mask works and all
applications, registrations, and renewals in connection therewith, (e) all trade
secrets and confidential business information (including ideas, research and
development, know-how, formulas, compositions, manufacturing and production
processes and techniques, technical data, designs, drawings, specifications,
customer and supplier lists, pricing and cost information, and business and
marketing plans and proposals), (f) all computer software (including data and
related documentation), (g) all other proprietary rights, and (h) all copies and
tangible embodiments thereof (in whatever form or medium).

     "Knowledge" means actual knowledge after reasonable investigation.

     "Legal Requirement" means any constitution, law, statute, treaty, rule,
regulation, ordinance, binding case law or principle of common law, notice,
approval or Order of any Governmental Body, and any Contract with any
Governmental Body relating to compliance with any of the foregoing.

     "Merger" has the meaning set forth in the Recitals above.

     "Multiemployer Plan" has the meaning set forth in ERISA Section 3(37).

     "Occupational Safety and Health Law" means any Legal Requirement designed
to provide safe and healthful working conditions and to reduce occupational
safety and health hazards, and any program, whether governmental or private
(such as those promulgated or sponsored by industry associations and insurance
companies), designed to provide safe and healthful working conditions.

     "Oil and Gas Interests" means the properties referenced under Section 4.13
of the Zydeco Disclosure Schedule hereof, which constitute as to Zydeco and its
Subsidiaries all interests in and rights in respect of oil, gas, mineral, and
related properties and assets of any kind and nature, direct or indirect,
including working interests, royalties, overriding royalties, production
payments, net profits interests, other nonworking interests and nonoperating
interests, contract rights, debt instruments, and equity interests in joint
ventures, partnerships, corporations and other entities, including but not
limited to common and preferred stock, debentures, bonds and other securities of
every kind and nature and unrelated assets coincidentally acquired in connection
with the acquisition of the foregoing assets; all interests in and rights in
respect of oil, gas and other minerals and hydrocarbons or revenues therefrom
and all contracts in connection therewith and claims and rights thereto
(including but not limited to all oil and gas leases and interests thereunder,
surface interests, fee interests, reversionary interests, royalties, overriding
royalties, reservations, and concessions), all easements, rights of way,
licenses, permits, leases, and other interests associated with, appurtenant to,
or necessary for the operation of any of the foregoing, and all interests in
equipment and machinery (including but not limited to well equipment and
machinery), oil and gas transmission or storage facilities (including but not
limited to tanks, tank batteries, pipelines and gathering systems), camps, water
plants, electric plants, gasoline and gas processing plants, refineries, and
other tangible personal property and fixtures associated with, appurtenant to or
necessary for the operation of any of the foregoing.

     "Order" means any order, injunction, judgment, decree, ruling, assessment
or arbitration award of any Governmental Body or arbitrator.

     "Ordinary Course of Business" means the ordinary course of business
consistent with past custom and practice (including with respect to quantity and
frequency).

     "OTC" means the OTC Bulletin Board.

                                       5
<PAGE>

     "Outstanding DataVon Shares" means all DataVon Common Stock issued and
outstanding immediately prior to the Effective Time.

     "Parties" has the meaning set forth in the preface above.

     "PBGC" means the Pension Benefit Guaranty Corporation.

     "Person" means an individual, a partnership, a corporation, an association,
a joint stock company, a trust, a joint venture, an unincorporated organization,
or a governmental entity (or any department, agency, or political subdivision
thereof).

     "Real Property" means all real property of Zydeco and its Subsidiaries,
including all parcels and tracts of land in which Zydeco or its Subsidiaries has
a fee simple estate or a leasehold estate, and all improvements, easements and
appurtenances thereto.

     "Release" means any spilling, leaking, emitting, discharging, depositing,
escaping, leaching, dumping, or other releasing into the Environment, whether
intentional or unintentional.

     "Reportable Event" has the meaning set forth in ERISA Section 4043.

     "SEC" means the Securities and Exchange Commission.

     "Secretary" has the meaning set forth in Section 2.02.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Securities Exchange Act" means the Securities Exchange Act of 1934, as
amended.

     "Security Interest" means any mortgage, pledge, lien, encumbrance, charge,
or other security interest, other than (a) mechanic's, materialmen's, and
similar liens, (b) liens for Taxes not yet due and payable, and (c) purchase
money liens and liens securing rental payments under capital lease arrangements.

     "Subsidiary" means any corporation with respect to which a specified Person
(or a Subsidiary thereof) owns a majority of the common stock or has the power
to vote or direct the voting of sufficient securities to elect a majority of the
directors.

     "Surviving Corporation" has the meaning set forth in Section 2.01.

     "Taxes" shall mean all excise, real and personal property, sales, use,
customs duties, payroll, withholding, capital or franchise (based on capital
and/or activity), estimated and other taxes, including Income Taxes, imposed by
a federal, state, local or foreign governmental agency, whether in the form of
assessments which are in the nature of Taxes or otherwise, together with all
interest, penalties and additions imposed with respect to such amounts.

     "Tax Returns" means returns, declarations, reports, claims for refund,
information returns or other documents (including any related or supporting
schedules, statements or information) filed or required to be filed in
connection with the determination, assessment or collection of Taxes of any
Party or the administration of any laws, regulations or administrative
requirements relating to any Taxes.

     "Texas Law" has the meaning set forth in the Recitals above.

     "Threatened" - an action or matter would be considered to have been
"Threatened" if a demand or statement has been made (whether orally or in
writing) or a notice has been given (whether orally or in writing), or any other
event has occurred or any other circumstances exist, that would lead a prudent
Person to conclude that such action or matter is likely to be asserted,
commenced, taken or otherwise pursued in the future.

                                       6
<PAGE>

     "Zydeco" has the meaning set forth in the preface above.

     "Zydeco Common Stock" means the common stock, par value $.001 per share, of
Zydeco.

     "Zydeco Disclosure Schedule" has the meaning set forth in Article 4.

     "Zydeco Preferred Stock" means the voting, Series A convertible senior
preferred stock, par value $.001 per share, of Zydeco as described in the form
of Certificate of Designation attached as Exhibit D, convertible into 7,190,000
shares of Zydeco Common Stock.

     "Zydeco Sub" has the meaning set forth in the preface above.

                                   ARTICLE 2

                                  THE MERGER

      Section 2.01 Basic Transaction. Upon the terms and subject to the
conditions set forth in this Agreement and in accordance with Texas Law, at the
Effective Time, Zydeco Sub shall be merged with and into DataVon. As a result of
the Merger, the outstanding shares of capital stock of Zydeco Sub and DataVon
shall be converted or canceled in the manner provided in Section 2.06 of this
Agreement, the separate corporate existence of Zydeco Sub shall cease, and
DataVon will be the surviving corporation in the Merger (the "Surviving
Corporation").

     Section 2.02 Effective Time; Closing. As promptly as practicable after
Closing (defined below), and in no event later than the first Business Day
following the satisfaction or, if permissible, waiver of the conditions set
forth in Article 7 (or such other date as may be agreed in writing by each of
the Parties), the Parties shall cause the Merger to be consummated by filing a
certificate of merger, substantially in the form of Exhibit A attached hereto
(collectively, the "Articles of Merger"), with the Secretary of State of the
State of Texas (the "Secretary") in such form as is required by, and executed in
accordance with the relevant provisions of, Texas Law. The term "Effective Time"
means the date and time of the filing of the Articles of Merger with the
Secretary (or such later time as may be agreed in writing by each of the Parties
and specified in the Articles of Merger). Immediately prior to the filing of the
Articles of Merger, a closing (the "Closing") will be held at the Houston, Texas
offices of Baker & McKenzie at 9:00 a.m., local time, on the first Business Day
after the date on which the last of the conditions to Closing set forth in
Article 7 hereof (other than conditions to be satisfied at the Closing) are
fulfilled or waived by the appropriate Party, as the case may be (or such other
time, date or place as the Parties may agree) (the "Closing Date").

     Section 2.03 Effect of the Merger. At the Effective Time, the effect of the
Merger shall be as provided in the applicable provisions of Texas Law.

     Section 2.04  Articles of Incorporation; Bylaws.

         (a) At the Effective Time, the articles of incorporation of DataVon, as
in effect immediately prior to the Effective Time, shall be the articles of
incorporation of the Surviving Corporation, until thereafter amended as provided
therein or by applicable law.

         (b) At the Effective Time, the bylaws of DataVon, as in effect
immediately prior to the Effective Time, shall be the bylaws of the Surviving
Corporation until thereafter amended as provided therein or by applicable law.

     Section 2.05 Directors and Officers. The director of DataVon immediately
prior to the Effective Time shall be the initial director of the Surviving
Corporation, to hold office in accordance with the articles of incorporation and
bylaws of the Surviving Corporation until a successor is elected or appointed
and has qualified or until the earliest of such director's death, resignation,
removal or disqualification, and the officers of DataVon immediately prior to
the Effective Time shall be the initial officers of the Surviving Corporation,
in each case until

                                       7
<PAGE>

their respective successors are duly elected or appointed and qualified, or as
otherwise provided in the bylaws of the Surviving Corporation.

      Section 2.06 Conversion of Securities. At the Effective Time, by virtue of
the Merger and without any action on the part of Zydeco Sub or DataVon:

          (a)  Each share of common stock, no par value, of DataVon (the
"DataVon Common Stock") issued and outstanding immediately prior to the
Effective Time (except for such DataVon Common Stock held by the DataVon
Stockholder), shall be converted into the right to receive a number of fully
paid, non assessable shares of Zydeco Common Stock equal to 39.81385 (the
"Exchange Ratio").

          (b)  Shares of DataVon Common Stock held by DataVon Stockholder issued
and outstanding immediately prior to the Effective Time, shall be converted into
the right to receive (i) a number of fully paid, non assessable shares of Zydeco
Common Stock equal to 31,548,877, and (ii) a number of fully paid, non
assessable shares of Zydeco Preferred Stock equal to 7,190, based on the number
of shares of DataVon Common Stock held by the DataVon Stockholder as of the date
of this Agreement (the Zydeco Common Stock and Zydeco Preferred Stock to be
issued to holders of DataVon Common Stock pursuant to Section 2.06(a) and
2.06(b), collectively, the "Merger Consideration"). If between the date of this
Agreement and the Effective Time, any shares of DataVon Common Stock held by the
DataVon Stockholder shall be transferred to another party and/or any shares of
DataVon Common Stock are transferred to the DataVon Stockholder, the Merger
Consideration shall be correspondingly adjusted to the extent appropriate to
reflect such transfer of shares.

          (c)  In any event, if between the date of this Agreement and the
Effective Time, the outstanding shares of Zydeco Common Stock, Zydeco Preferred
Stock and/or DataVon Common Stock shall have been changed into a different
number of shares or a different class, by reason of any declared or completed
stock dividend, subdivision, reclassification, recapitalization, split,
combination or exchange of shares, the Merger Consideration shall be
correspondingly adjusted to the extent appropriate to reflect such stock
dividend, subdivision, reclassification, recapitalization, split, combination or
exchange of shares. Upon surrender of the certificate(s) representing DataVon
Shares in accordance with Section 2.07, such holder of DataVon Shares shall be
entitled to receive the Merger Consideration.

          (d)  From and after the Effective Time, all DataVon Shares shall no
longer be outstanding and shall automatically be canceled and retired and shall
cease to exist, and each certificate previously representing any such shares
shall thereafter represent the right to receive the Merger Consideration into
which such DataVon Shares were converted in the Merger, upon surrender of the
certificate(s) representing such shares in accordance with Section 2.07.
Certificates previously representing shares of DataVon Shares shall be exchanged
for the Merger Consideration upon the surrender of such certificates in
accordance with the provisions of Section 2.07, without interest.

          (e)  Any DataVon Shares held in the treasury of DataVon and any shares
of DataVon Shares owned by Zydeco or any direct or indirect wholly owned
subsidiary of Zydeco immediately prior to the Effective Time shall be canceled
and extinguished without any conversion thereof and no payment shall be made
with respect thereto.

          (f)  Each share of common stock, par value $.01 per share, of Zydeco
Sub issued and outstanding immediately prior to the Effective Time shall be
converted into and become one validly issued, fully paid and nonassessable share
of common stock of the Surviving Corporation at the Effective Time, and the
Surviving Corporation thereafter shall not have other equity securities.

     Section 2.07  Exchange of Certificates.

          (a) Exchange Procedures. At the Closing, each holder of record of a
certificate or certificates (the "Certificates") which immediately prior to the
Effective Time represented Outstanding DataVon Shares shall tender such
Certificates to Zydeco or its designated transfer or exchange agent with such
other documents as Zydeco

                                       8
<PAGE>

may reasonably request, including a stock power. Upon surrender of a Certificate
for cancellation to Zydeco together with such duly executed documents as may be
required, the holder of such Certificate shall be entitled to receive in
exchange therefor the Merger Consideration which such holder has the right to
receive in respect of DataVon Shares formerly represented by such Certificates,
together with any dividends or other distributions to which such holder is
entitled pursuant to Section 2.07(b). The surrendered Certificates shall then be
marked canceled. In the event of a transfer of ownership of DataVon Shares which
is not registered in the transfer records of DataVon, the Merger Consideration
may be paid in accordance with Article 2 to the transferee if the Certificates
representing such shares of DataVon Shares are presented to Zydeco, accompanied
by all documents required to evidence and effect such transfer and by evidence
that any applicable stock transfer taxes have been paid. Until surrendered as
contemplated by this Section 2.07(a), each Certificate shall be deemed at any
time after the Effective Time to represent only the right to receive upon such
surrender the Merger Consideration, and any dividends or other distributions to
which such holder is entitled pursuant to Section 2.07(b). No interest shall be
paid on the Merger Consideration.

          (b) Distributions with Respect to Unexchanged Shares of Zydeco Common
Stock. No dividends or other distributions declared or made after the Effective
Time with respect to Zydeco Common Stock with a record date after the Effective
Time shall be paid to the holder of any unsurrendered Certificate with respect
to the shares of Zydeco Common Stock evidenced thereby until the holder of such
Certificate shall surrender such Certificate. Subject to the effect of
applicable laws, following surrender of any such Certificate, there shall be
paid to the holder of such Certificate, in addition to the shares of Zydeco
Common Stock as provided in Section 2.07(a), without interest, the amount of
dividends or other distributions with a record date after the Effective Time
theretofore paid with respect to the whole shares of Zydeco Common Stock
evidenced by such Certificate. There shall be paid to the holder of the
certificates representing whole shares of Zydeco Common Stock issued in exchange
therefor, without interest: (i) promptly, the amount of dividends or other
distributions with a record date after the Effective Time theretofore paid with
respect to such whole shares of Zydeco Common Stock, and (ii) at the appropriate
payment date, the amount of dividends or other distributions, with a record date
after the Effective Time but prior to surrender and a payment date occurring
after surrender, payable with respect to such whole shares of Zydeco Common
Stock.

          (c) No Further Rights in DataVon Shares. The Merger Consideration
issued or paid upon conversion of the Outstanding DataVon Shares in accordance
with the terms hereof (including any cash paid or other distributions pursuant
to Sections 2.07(b)) shall be deemed to have been issued or paid in full
satisfaction of all rights pertaining to such DataVon Shares.

          (d) No Liability. Neither Zydeco nor the Surviving Corporation shall
be liable to DataVon for any Merger Consideration (or dividends or distributions
with respect thereto) which remains undistributed to the holders of DataVon
Shares for one year after the Effective Time and is delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.

          (e) Lost Certificates. If any Certificate shall have been lost,
stolen or destroyed, upon the making of an affidavit of that fact by the DataVon
stockholder claiming such Certificate to be lost, stolen or destroyed and, if
required by the Surviving Corporation, the posting by such DataVon stockholder
of a bond in such reasonable amount as the Surviving Corporation may direct as
indemnity against any claim that may be made against it with respect to such
Certificate, Zydeco will issue in exchange for such lost, stolen or destroyed
Certificate the Merger Consideration, and unpaid dividends and distributions on
the Merger Consideration deliverable in respect thereof pursuant to this
Agreement.

          (f) No Fractional Shares. No certificates or scrip evidencing
fractional shares of Zydeco Common Stock or Zydeco Preferred Stock shall be
issued upon the surrender for exchange of Certificates, but in lieu thereof each
stockholder of DataVon who would otherwise be entitled to receive a fraction of
a share of Zydeco Common Stock and/or Zydeco Preferred Stock, after aggregating
all fractional shares of Zydeco Common Stock and/or Zydeco Preferred Stock which
such holder would be entitled to receive under Section 2.06, shall receive the
next larger number of whole shares of Zydeco Common Stock and/or Zydeco
Preferred Stock to which such holder would otherwise be entitled.

                                       9
<PAGE>

     Section 2.08 Stock Transfer Books. At the Effective Time, the stock
transfer books of DataVon shall be closed and there shall be no further
registration of transfers of shares of DataVon Shares thereafter on the records
of DataVon. On or after the Effective Time, any Certificates presented to Zydeco
for any reason shall be converted into the Merger Consideration, and any
dividends or other distributions to which they are entitled pursuant to Section
2.07(b)) in accordance with the terms of this Agreement.

     Section 2.09 Stock Options. At the Effective Time, each then outstanding
option to purchase shares of DataVon Common Stock granted by DataVon
(collectively, the "DataVon Options"), shall, as of the Effective Time,
automatically and without any action on the part of the holder thereof, be
assumed by Zydeco. The holders of such DataVon Options shall continue to have,
and be subject to, the same terms and conditions set forth in the stock option
agreements pursuant to which such DataVon Options were issued as in effect
immediately prior to the Effective Time, except that (i) such DataVon Options
shall be exercisable for that number of whole shares of Zydeco Common Stock
equal to the product of the number of shares of DataVon Common Stock covered by
the DataVon Option immediately prior to the Effective Time multiplied by the
Exchange Ratio rounded up to the nearest whole number of shares of Zydeco Common
Stock, and (ii) the per share exercise price for the shares of Zydeco Common
Stock issuable upon the exercise of such assumed DataVon Option shall be equal
to the quotient determined by dividing the exercise price per share of DataVon
Common Stock specified for such DataVon Option under the applicable stock option
agreement in effect immediately prior to the Effective Time by the Exchange
Ratio, rounding the resulting exercise price down to the nearest whole cent. At
the Effective Time, Zydeco shall reserve for issuance the number of shares of
Zydeco Common Stock that will become issuable upon the exercise of the DataVon
Options pursuant to this Section 2.09. Nothing in this Section 2.09 shall affect
the schedule of vesting (or the acceleration thereof) with respect to the
DataVon Options to be assumed by Zydeco as provided in this Section 2.09.
Notwithstanding anything to the contrary, nothing herein shall require Zydeco to
issue fractional shares of Zydeco Common Stock upon the exercise of any DataVon
Option.

                                   ARTICLE 3

                   REPRESENTATIONS AND WARRANTIES OF DATAVON

     DataVon represents and warrants to Zydeco that the statements contained in
this Article 3 are correct and complete in all material respects as of the date
of this Agreement and will be correct and complete in all material respects as
of the Closing Date (as though made then and as though the Closing Date were
substituted for the date of this Agreement throughout this Article 3), except as
set forth in the disclosure schedule delivered by DataVon to Zydeco on the date
hereof and initialed by the Parties (the "DataVon Disclosure Schedule"). Nothing
in the DataVon Disclosure Schedule shall be deemed adequate to disclose an
exception to a representation or warranty made herein, however, unless the
DataVon Disclosure Schedule identifies the exception with reasonable
particularity, describes the relevant facts in reasonable detail and identifies
the subsection of this Article 3 to which the exception applies. Without
limiting the generality of the foregoing, the mere listing (or inclusion of a
copy) of a document or other item shall not be deemed adequate to disclose an
exception to a representation or warranty made herein (unless the representation
or warranty has to do with the existence of the document or other item itself).
The DataVon Disclosure Schedule will be arranged in paragraphs corresponding to
the lettered and numbered paragraphs contained in this Article 3.

     Section 3.01 Organization, Qualification and Corporate Power. DataVon is a
corporation duly organized, validly existing, and in good standing under the
laws of Texas. Each of DataVon and its Subsidiaries is duly authorized to
conduct business and is in good standing under the laws of each jurisdiction
where such qualification is required. Each of DataVon and its Subsidiaries has
full corporate power and authority and all licenses, permits and authorizations
necessary to carry on the businesses in which it is engaged, to own and use the
properties owned and used by it and to execute and deliver this Agreement and to
perform its obligations hereunder and to consummate the Merger and the
transactions contemplated thereby. Section 3.01 of the DataVon Disclosure
Schedule lists the directors and officers of DataVon and its Subsidiaries.
Except as set forth on Section 3.01 of the DataVon Disclosure Schedule, each of
DataVon and its Subsidiaries does not have and never has had any equity or
ownership interests in any corporation, partnership, joint venture, limited
liability company or other legal entity. The execution and delivery of this
Agreement and the other agreements, documents and instruments executed in

                                       10
<PAGE>

connection herewith to which DataVon is a party and the consummation by DataVon
of the transactions contemplated hereby have been duly and validly authorized by
all necessary corporate action and no other corporate proceedings on the part of
DataVon are necessary to authorize this Agreement or such other agreements,
documents and instruments or to consummate the Merger and the transactions
contemplated thereby (other than the filing and recordation of the Articles of
Merger with the Secretary as required by Texas Law). The Agreement and the other
agreements, documents and instruments executed in connection herewith to which
DataVon is a party has been duly and validly executed and delivered by DataVon
and constitute a legal, valid and binding obligation of DataVon, enforceable
against DataVon in accordance with their respective terms. The minute books
(containing the records of meetings of the stockholders, the board of directors,
and any committees of the board of directors), the stock certificate books, and
the stock record books of each of DataVon and its Subsidiaries are correct and
complete. None of DataVon and its Subsidiaries is in default under or in
violation of any provision of its charter or bylaws.

     Section 3.02 Noncontravention. Neither the execution and the delivery of
this Agreement, nor the consummation of the transactions contemplated hereby,
will (a) violate any constitution, statute, regulation, rule, injunction,
judgment, order, decree, ruling, charge, or other restriction of any government,
governmental agency, or court to which DataVon is subject or any provision of
its charter or by-laws or (b) conflict with, result in a breach of, constitute a
default under, result in the acceleration of, create in any party the right to
accelerate, terminate, modify, or cancel, or require any notice under any
agreement, contract, lease, license, instrument, or other arrangement to which
DataVon is a party or by which it is bound or to which any of its assets is
subject (or result in the imposition of any Security Interest upon any of its
assets). None of DataVon and its Subsidiaries needs to give any notice to, make
any filing with, or obtain any authorization, consent, or approval of any
government or governmental agency in order for the Parties to consummate the
transactions contemplated by this Agreement, other than the filing and
recordation of the Articles of Merger with the Secretary.

     Section 3.03 Capitalization. The entire authorized capital stock of DataVon
consists of 1,100,000 DataVon Shares, of which 1,000,000 DataVon Shares are
issued and outstanding and no DataVon Shares are held in treasury. All of the
issued and outstanding DataVon Shares have been duly authorized, are validly
issued, fully paid, and nonassessable. Except as set forth in Section 3.03(a) of
the DataVon Disclosure Schedule, there are no outstanding or authorized options,
warrants, purchase rights, subscription rights, conversion rights, exchange
rights, or other contracts or commitments that could require DataVon to issue,
sell, or otherwise cause to become outstanding any of its capital stock. There
are no outstanding or authorized stock appreciation, phantom stock, profit
participation, or similar rights with respect to DataVon. Except as set forth in
Section 3.03(b) of the DataVon Disclosure Schedule, there are no voting trusts,
proxies, or other agreements or understandings with respect to the voting of the
capital stock of DataVon. DataVon has reserved an aggregate of 100,000 DataVon
Common Stock shares for issuance pursuant to the exercise of the outstanding
options, warrants and other convertible securities listed in Section 3.03(a) of
the DataVon Disclosure Schedule. Section 3.03(a) of the DataVon Disclosure
Schedule shall set forth the date of grant, exercise price, number of shares of
DataVon Common Stock exercisable for and the expiration date for each
outstanding option, warrant and other convertible security of DataVon. Section
3.03(b) of the DataVon Disclosure Schedule shall set forth each outstanding
option, warrant and other convertible security of DataVon that is subject to
registration rights.

     Section 3.04 Brokers' Fees. None of DataVon and its Subsidiaries has any
liability or obligation to pay any fees or commissions to any broker, finder, or
agent with respect to the transactions contemplated by this Agreement.

     Section 3.05 Title to Assets. Except as set forth in Section 3.05 of the
DataVon Disclosure Schedule, DataVon and its Subsidiaries have good and
marketable title to, or a valid leasehold interest in, the properties and assets
used by them, located on their premises, or shown on the DataVon Balance Sheet
(as defined in Section 3.07) or acquired after the date thereof, free and clear
of all Security Interests, except for properties and assets disposed of in the
Ordinary Course of Business since the date of the DataVon Balance Sheet.

     Section 3.06 Subsidiaries. Section 3.06 of the DataVon Disclosure Schedule
sets forth for each Subsidiary of DataVon (i) its name and jurisdiction of
incorporation, (ii) the number of shares of authorized capital stock of each
class of its capital stock, (iii) the number of issued and outstanding shares of
each class of its capital stock, the

                                       11
<PAGE>

names of the holders thereof, and the number of shares held by each such holder,
and (iv) the number of shares of its capital stock held in treasury. All of the
issued and outstanding shares of capital stock of each Subsidiary of DataVon
have been duly authorized and are validly issued, fully paid, and nonassessable.
One of DataVon and its Subsidiaries holds of record and owns beneficially all of
the outstanding shares of each Subsidiary of DataVon, free and clear of any
restrictions on transfer (other than restrictions under the Securities Act and
state securities laws), Taxes, Security Interests, options, warrants, purchase
rights, contracts, commitments, equities, claims, and demands. There are no
outstanding or authorized options, warrants, purchase rights, subscription
rights, conversion rights, exchange rights, or other contracts or commitments
that could require any of DataVon and its Subsidiaries to sell, transfer, or
otherwise dispose of any capital stock of any of its Subsidiaries or that could
require any Subsidiary of DataVon to issue, sell, or otherwise cause to become
outstanding any of its own capital stock. There are no outstanding stock
appreciation, phantom stock, profit participation, or similar rights with
respect to any Subsidiary of DataVon. There are no voting trusts, proxies, or
other agreements or understandings with respect to the voting of any capital
stock of any Subsidiary of DataVon. None of DataVon and its Subsidiaries
controls directly or indirectly or has any direct or indirect equity
participation in any corporation, partnership, trust, or other business
association which is not a Subsidiary of DataVon.

     Section 3.07  Financial Statements.

          (a)  The DataVon Audited Statements (including, in each case, any
notes thereto) (i) are in accordance with the books and records of DataVon; (ii)
present fairly and accurately the financial condition of DataVon, as of the
dates of the balance sheets; (iii) present fairly and accurately the results of
operations for the periods covered by such statements; (iv) present fairly and
accurately the changes in stockholders' equity and cash flows for the periods
covered by such statements; (v) have been prepared in accordance with GAAP
applied on a consistent basis; and (vi) include all adjustments (consisting of
only normal recurring accruals) which are necessary for a fair presentation of
the financial condition of DataVon, and of the results of operations of DataVon
for the periods covered by such statements, and fairly present the financial
position, results of operations and changes in stockholders' equity and cash
flows of DataVon and its consolidated subsidiaries as of the respective dates
thereof and for the respective periods indicated therein.

          (b)  The unaudited balance sheet and statement of income and cash flow
("DataVon Most Recent Financial Statements") as of and for the three months
ended March 31, 2000 for DataVon have been prepared in accordance with GAAP
applied on a consistent basis and present fairly the financial condition of
DataVon as of such dates and the results of operations of DataVon for such
periods; provided, however, that the DataVon Most Recent Financial Statements
are subject to normal year-end adjustments and lack footnotes and other
presentation items.

          (c) Except to the extent set forth on (i) the audited consolidated
balance sheet of DataVon as of December 31, 1999, including the notes to the
audited financial statements of which such balance sheet is a part, for the year
ended December 31, 1999 (the "DataVon Balance Sheet"), and/or (ii) the unaudited
balance sheet of DataVon as of March 31, 2000, including the notes to the
unaudited financial statements of which such balance sheet is a part, neither
DataVon nor any of its Subsidiaries has any liability or obligation of any
nature (whether accrued, absolute, contingent or otherwise) which would be
required to be reflected on a balance sheet, or in the notes thereto, prepared
in accordance with generally accepted accounting principles applied on a
consistent basis.

          (d) Except as set forth herein or in Section 3.07 of the DataVon
Disclosure Schedule, since March 31, 2000, there has not been any material
adverse change in the financial condition of DataVon.

     Section 3.08 Undisclosed Liabilities. Except as set forth in Section 3.08
of the DataVon Disclosure Schedule, none of DataVon and its Subsidiaries has any
liability (whether asserted or unasserted, whether absolute or contingent,
whether accrued or unaccrued, whether liquidated or unliquidated, and whether
due or to become due, including any liability for Taxes), and there is no basis
for any present or future action, suit, proceeding, hearing, investigation,
charge, complaint, claim or demand against any of them giving rise to any
liability, except for liabilities set forth on the face of the DataVon Balance
Sheet (rather than in any notes thereto).

                                       12
<PAGE>

     Section 3.09 Legal Compliance. Each of DataVon, its Subsidiaries, and their
respective predecessors and Affiliates has complied with all applicable laws
(including rules, regulations, codes, plans, injunctions, judgments, orders,
decrees, rulings, and charges thereunder) of federal, state, local, and foreign
governments (and all agencies thereof), including all import and export laws
relating to its products and business and the payment of all customs duties or
other official charges incurred, due or owed by DataVon or its Subsidiaries, and
no action, suit, proceeding, hearing, investigation, charge, complaint, claim,
demand, or notice has been filed or commenced against any of them alleging any
failure so to comply.

     Section 3.10 Real Property. Each of DataVon and its Subsidiaries does not
own, has never owned, does not have, nor has it ever had any interest in any
real property, other than pursuant to a valid lease.

     Section 3.11 Tangible Assets. The buildings, machinery, equipment, and
other tangible assets that DataVon and its Subsidiaries own and lease are free
from material defects (patent and latent), have been maintained in accordance
with normal industry practice, and are in good operating condition and repair
(subject to normal wear and tear), and is suitable for the purpose for which it
presently is used.

     Section 3.12 Powers of Attorney. There are no outstanding powers of
attorney executed on behalf of any of DataVon and its Subsidiaries.

     Section 3.13 Insurance. Section 3.13 of the DataVon Disclosure Schedule
sets forth the following information with respect to each insurance policy
(including policies providing property, casualty, liability, and workers'
compensation coverage and bond and surety arrangements) with respect to which
any of DataVon and its Subsidiaries has been a party, a named insured, or
otherwise the beneficiary of coverage at any time within the past 3 years:

     (a)   the name, address, and telephone number of the agent;

     (b)   the name of the insurer, the name of the policyholder, and the name
of each covered insured;

     (c)   the policy number and the period of coverage;

     (d)   the scope (including an indication of whether the coverage is on a
claims made, occurrence, or other basis) and amount (including a description of
how deductibles and ceilings are calculated and operate) of coverage; and

     (e)   a description of any retroactive premium adjustments or other loss-
sharing arrangements.

     With respect to each such insurance policy: (i) the policy is legal, valid,
binding, enforceable, and in full force and effect; (ii) the policy will
continue to be legal, valid, binding, enforceable, and in full force and effect
on identical terms following the consummation of the transactions contemplated
hereby; (iii) neither any of DataVon and its Subsidiaries nor any other party to
the policy is in breach or default (including with respect to the payment of
premiums or the giving of notices), and no event has occurred which, with notice
or the lapse of time, would constitute such a breach or default, or permit
termination, modification, or acceleration, under the policy; and (iii) no party
to the policy has repudiated any provision thereof. Each of DataVon and its
Subsidiaries has been covered during the past 2 years by insurance in scope and
amount customary and reasonable for the businesses in which it has engaged
during the aforementioned period. Section 3.13 of the DataVon Disclosure
Schedule describes any material self-insurance arrangements affecting any of
DataVon and its Subsidiaries.

     Section 3.14 Litigation. Section 3.14 of the DataVon Disclosure Schedule
sets forth each instance in which any of DataVon and its Subsidiaries (a) is
subject to any outstanding injunction, judgment, order, decree, ruling, or
charge or (b) is a party or, to its Knowledge, is Threatened to be made a party
to any action, suit, proceeding, hearing, or investigation of, in, or before any
court or quasi-judicial or administrative agency of any federal, state, local,
or foreign jurisdiction or before any arbitrator. Except as otherwise set forth
therein, none of the actions, suits, proceedings, hearings, and investigations
set forth in Section 3.14 of the DataVon Disclosure Schedule could result in any
adverse change in the business, financial condition, operations, results of
operations, or future prospects of

                                       13
<PAGE>

any of DataVon and its Subsidiaries. None of DataVon and its Subsidiaries and
the directors and officers (and employees with responsibility for litigation
matters) of DataVon and its Subsidiaries has any reason to believe that any such
action, suit, proceeding, hearing, or investigation may be brought or Threatened
against any of DataVon and its Subsidiaries.

     Section 3.15 Employees. None of DataVon and its Subsidiaries is a party to
or bound by any collective bargaining agreement, nor has it experienced any
strike or material grievance, claim of unfair labor practices, or other
collective bargaining dispute within the past three years. None of DataVon and
its Subsidiaries has committed any material unfair labor practice. None of
DataVon and its Subsidiaries and the directors and officers of DataVon and its
Subsidiaries has any Knowledge of any organizational effort presently being made
or Threatened by or on behalf of any labor union with respect to employees of
DataVon and its Subsidiaries.

     Section 3.16 Guaranties. None of DataVon and its Subsidiaries is a
guarantor or otherwise is responsible for any liability or obligation (including
indebtedness) of any other Person.

     Section 3.17 Certain Business Practices. DataVon and its Subsidiaries and,
to the Knowledge of DataVon, each director, officer, authorized agent or
employee of DataVon or any of its Subsidiaries have not, directly or indirectly,
(a) used any funds for unlawful contributions, gifts, entertainment or other
unlawful expenses relating to political activity, (b) made any unlawful payment
to foreign or domestic government officials or employees or to foreign or
domestic political parties or campaigns or violated any provision of the Foreign
Corrupt Practices Act of 1977, as amended, (c) made any other unlawful payment,
(d) violated any of the provisions of Section 999 of the Code or Section 8 of
the Export Administration Act, as amended, or (e) established or maintained any
fund or asset that has not been recorded in the books and records of DataVon and
its Subsidiaries.

     Section 3.18 Parachute Payments. DataVon has not entered into any agreement
that would result in the making of "parachute payments," as defined in Section
280G of the Code, to any Person.

     Section 3.19 Disclosure. The representations and warranties contained in
this Article 3 do not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements and
information contained in this Article 3 not misleading.

                                   ARTICLE 4

                        REPRESENTATIONS AND WARRANTIES

                    CONCERNING ZYDECO AND ITS SUBSIDIARIES

     Zydeco and its Subsidiaries represent and warrant to DataVon that the
statements contained in this Article 4 are correct and complete in all material
respects as of the date of this Agreement and will be correct and complete in
all material respects as of the Closing Date (as though made then and as though
the Closing Date were substituted for the date of this Agreement throughout this
Article 4), except as set forth in the disclosure schedule delivered by Zydeco
to DataVon on the date hereof and initialed by the Parties (the "Zydeco
Disclosure Schedule").  Nothing in the Zydeco Disclosure Schedule shall be
deemed adequate to disclose an exception to a representation or warranty made
herein, however, unless the Zydeco Disclosure Schedule identifies the exception
with reasonable particularity, describes the relevant facts in reasonable detail
and identifies the subsection of this Article 4 to which the exception applies.
Without limiting the generality of the foregoing, the mere listing (or inclusion
of a copy) of a document or other item shall not be deemed adequate to disclose
an exception to a representation or warranty made herein (unless the
representation or warranty has to do with the existence of the document or other
item itself).  The Zydeco Disclosure Schedule will be arranged in paragraphs
corresponding to the lettered and numbered paragraphs contained in this Article
4.

     Section 4.01 Organization, Qualification, and Corporate Power. Each of
Zydeco and its Subsidiaries is a corporation duly organized, validly existing,
and in good standing under the laws of the jurisdiction of its incorporation.
Each of Zydeco and its Subsidiaries is duly authorized to conduct business and
is in good standing under the laws of each jurisdiction where such qualification
is required. Each of Zydeco and its Subsidiaries has full

                                       14
<PAGE>

corporate power and authority and all licenses, permits and authorizations
necessary to carry on the businesses in which it is engaged, to own and use the
properties owned and used by it and to execute and deliver this Agreement and to
perform its obligations hereunder and to consummate the Merger and the
transactions contemplated thereby. Section 4.01 of the Zydeco Disclosure
Schedule lists the directors and officers of Zydeco and its Subsidiaries. Except
as set forth on Section 4.01 of the Zydeco Disclosure Schedule, each of Zydeco
and its Subsidiaries does not have and never has had any equity or ownership
interests in any corporation, partnership, joint venture, limited liability
company or other legal entity. The execution and delivery of this Agreement by
Zydeco and the other agreements, documents and instruments executed in
connection herewith to which Zydeco is a party and the consummation by Zydeco of
the transactions contemplated hereby have been duly and validly authorized by
all necessary corporate action and no other corporate proceedings on the part of
Zydeco are necessary to authorize this Agreement or such other agreements,
documents and instruments or to consummate the Merger and the transactions
contemplated thereby (other than the filing and recordation of the Articles of
Merger with the Secretary as required by Texas Law). The Agreement and the other
agreements, documents and instruments executed in connection herewith to which
Zydeco is a party has been duly and validly executed and delivered by Zydeco and
constitute a legal, valid and binding obligation of Zydeco, enforceable against
Zydeco in accordance with their respective terms. The minute books (containing
the records of meetings of the stockholders, the board of directors, and any
committees of the board of directors), the stock certificate books, and the
stock record books of each of Zydeco and its Subsidiaries are correct and
complete. None of Zydeco and its Subsidiaries is in default under or in
violation of any provision of its charter or bylaws.

     Section 4.02 Capitalization. The entire authorized capital stock of DataVon
consists of 50,000,000 Zydeco Common Stock shares and 1,000,000 Zydeco Preferred
Stock shares. As of April 28, 2000, 10,039,096 shares of Zydeco Common Stock
were issued and outstanding, no Zydeco Preferred Stock shares were issued and
outstanding and no Zydeco Common Stock shares were held in treasury. All of the
issued and outstanding Zydeco Common Stock and Preferred Stock shares have been
duly authorized, are validly issued, fully paid and nonassessable and not
subject to preemptive rights. Except as set forth in Section 4.02(a) of the
Zydeco Disclosure Schedule, there are no outstanding or authorized options,
warrants, purchase rights, subscription rights, conversion rights, exchange
rights, or other contracts or commitments that could require Zydeco to issue,
sell, or otherwise cause to become outstanding any of its capital stock. There
are no outstanding or authorized stock appreciation, phantom stock, profit
participation, or similar rights with respect to Zydeco. There are no voting
trusts, proxies, or other agreements or understandings with respect to the
voting of the capital stock of Zydeco. Zydeco has reserved an aggregate of
4,713,786 Zydeco Common Stock shares for issuance pursuant to the exercise of
the outstanding options, warrants and other convertible securities listed in
Section 4.02(a) of the Zydeco Disclosure Schedule. Section 4.02(a) of the Zydeco
Disclosure Schedule shall set forth the date of grant, exercise price, number of
shares of Zydeco Common Stock exercisable for and the expiration date for each
outstanding option, warrant and other convertible security of Zydeco. Section
4.02(b) of the Zydeco Disclosure Schedule shall set forth each outstanding
option, warrant and other convertible security of Zydeco that is subject to
registration rights.

Section 4.03  Noncontravention. Neither the execution and the delivery of this
Agreement, nor the consummation of the transactions contemplated hereby, will
(a) violate any constitution, statute, regulation, rule, injunction, judgment,
order, decree, ruling, charge, or other restriction of any government,
governmental agency, or court to which any of Zydeco and its Subsidiaries is
subject or any provision of the charter or bylaws of any of Zydeco and its
Subsidiaries or (b) conflict with, result in a breach of, constitute a default
under, result in the acceleration of, create in any party the right to
accelerate, terminate, modify, or cancel, or require any notice under any
agreement, contract, lease, license, instrument, or other arrangement to which
any of Zydeco and its Subsidiaries is a party or by which it is bound or to
which any of its assets is subject (or result in the imposition of any Security
Interest upon any of its assets).  None of Zydeco and its Subsidiaries needs to
give any notice to, make any filing with, or obtain any authorization, consent,
or approval of any government or governmental agency in order for the Parties to
consummate the transactions contemplated by this Agreement, other than the
filing and recordation of the Articles of Merger with the Secretary.

     Section 4.04 Brokers' Fees. Except as set forth in Section 4.04 of the
Zydeco Disclosure Schedule, none of Zydeco and its Subsidiaries has any
liability or obligation to pay any fees or commissions to any broker, finder, or
agent with respect to the transactions contemplated by this Agreement.

                                       15
<PAGE>

     Section 4.05 Title to Assets. Zydeco and its Subsidiaries have good and
marketable title to, or a valid leasehold interest in, the properties and assets
used by them, located on their premises, or shown on the Zydeco Balance Sheet
(as defined in Section 4.07) or acquired after the date thereof, free and clear
of all Security Interests, except for properties and assets disposed of in the
Ordinary Course of Business since the date of the Zydeco Balance Sheet.

     Section 4.06 Subsidiaries. Section 4.06 of the Zydeco Disclosure Schedule
sets forth for each Subsidiary of Zydeco (i) its name and jurisdiction of
incorporation, (ii) the number of shares of authorized capital stock of each
class of its capital stock, (iii) the number of issued and outstanding shares of
each class of its capital stock, the names of the holders thereof, and the
number of shares held by each such holder, and (iv) the number of shares of its
capital stock held in treasury. All of the issued and outstanding shares of
capital stock of each Subsidiary of Zydeco have been duly authorized and are
validly issued, fully paid, and nonassessable. One of Zydeco and its
Subsidiaries holds of record and owns beneficially all of the outstanding shares
of each Subsidiary of Zydeco, free and clear of any restrictions on transfer
(other than restrictions under the Securities Act and state securities laws),
Taxes, Security Interests, options, warrants, purchase rights, contracts,
commitments, equities, claims, and demands. There are no outstanding or
authorized options, warrants, purchase rights, subscription rights, conversion
rights, exchange rights, or other contracts or commitments that could require
any of Zydeco and its Subsidiaries to sell, transfer, or otherwise dispose of
any capital stock of any of its Subsidiaries or that could require any
Subsidiary of Zydeco to issue, sell, or otherwise cause to become outstanding
any of its own capital stock. There are no outstanding stock appreciation,
phantom stock, profit participation, or similar rights with respect to any
Subsidiary of Zydeco. There are no voting trusts, proxies, or other agreements
or understandings with respect to the voting of any capital stock of any
Subsidiary of Zydeco. None of Zydeco and its Subsidiaries controls directly or
indirectly or has any direct or indirect equity participation in any
corporation, partnership, trust, or other business association which is not a
Subsidiary of Zydeco.

     Section 4.07 SEC Filings; Financial Statements. (a) Zydeco has timely filed
all forms, reports, statements and documents (collectively, the "SEC Reports")
required to be filed by it within the past twelve months with the SEC. The SEC
Reports, after giving effect to any amendments thereto, (i) were prepared in
accordance with the requirements of the Securities Act and the Exchange Act, as
the case may be, and the rules and regulations thereunder and (ii) did not, at
the time they were filed, contain any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary in
order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading. No Subsidiary of Zydeco is currently
required to file any form, report or other document with the SEC.

          (b)  Each of the financial statements (including, in each case, any
notes thereto) contained in the SEC Reports (i) are in accordance with the books
and records of Zydeco; (ii) present fairly and accurately the financial
condition of Zydeco, as of the dates of the balance sheets; (iii) present fairly
and accurately the results of operations for the periods covered by such
statements; (iv) present fairly and accurately the changes in stockholders'
equity and cash flows for the periods covered by such statements; (v) have been
prepared in accordance with GAAP applied on a consistent basis; (vi) include all
adjustments (consisting of only normal recurring accruals which are necessary
for a fair presentation of the financial condition of Zydeco, and of the results
of operations of Zydeco for the periods covered by such statements; and (vii)
fully comply with all requirements of Regulation S-K and all applicable
securities laws, and each fairly presented the financial position, results of
operations and changes in stockholders' equity and cash flows of Zydeco and its
consolidated subsidiaries as of the respective dates thereof and for the
respective periods indicated therein.

          (c) Except to the extent set forth on the audited consolidated balance
sheet of Zydeco as of December 31, 1999, including the notes to the audited
financial statements of which such balance sheet is a part and which is included
in Zydeco's Form 10-KSB for the year ended December 31, 1999 (the "Zydeco
Balance Sheet"), neither Zydeco nor any of its Subsidiaries has any liability or
obligation of any nature (whether accrued, absolute, contingent or otherwise)
which would be required to be reflected on a balance sheet, or in the notes
thereto, prepared in accordance with generally accepted accounting principles
applied on a consistent basis.

                                       16
<PAGE>

          (d)  Zydeco has heretofore made available to DataVon, true, complete
and correct copies of all amendments and modifications (if any) that have not
been filed by Zydeco with the SEC to all agreements, documents and other
instruments that previously had been filed by Zydeco as exhibits to the SEC
Reports and are currently in effect.

     Section 4.08 Absence of Certain Changes or Events. Since December 31, 1999,
there has not been any material adverse change in the business, financial
condition, operations, results of operations, or future prospects of any of
Zydeco and its Subsidiaries. Without limiting the generality of the foregoing,
since that date:

          (a)  none of Zydeco and its Subsidiaries has sold, leased,
transferred, or assigned any material assets, tangible or intangible, outside
the Ordinary Course of Business;

          (b)  none of Zydeco and its Subsidiaries has entered into any material
agreement, contract, lease, or license (or series of related agreements,
contracts, leases and licenses) either involving more than $10,000 or outside
the Ordinary Course of Business;

          (c)  no party (including any of Zydeco and its Subsidiaries) has
accelerated, terminated, modified, or cancelled any agreement, contract, lease,
or license (or series of related agreements, contracts, leases, and licenses)
involving more than $10,000 to which any of Zydeco and its Subsidiaries is a
party or by which any of them is bound;

          (d)  none of Zydeco and its Subsidiaries has imposed any Security
Interest upon any of its assets, tangible or intangible;

          (e)  none of Zydeco and its Subsidiaries has made any capital
expenditures (or series of related capital expenditures) in excess of $10,000;

          (f)  except as set forth in Section 4.08(f) of the Zydeco Disclosure
Schedule, none of Zydeco and its Subsidiaries has made any capital investment
in, any loan to, or any acquisition of the securities or assets of, any other
Person;

          (g)  none of Zydeco and its Subsidiaries has issued any note, bond, or
other debt security or created, incurred, assumed, or guaranteed any
indebtedness for borrowed money and capitalized lease obligations either
involving more than $5,000 singly or $10,000 in the aggregate;

          (h) none of Zydeco and its Subsidiaries has granted any license or
sublicense of any rights under or with respect to any Intellectual Property;

          (i) there has been no change made or authorized in the charter or
bylaws of any of Zydeco and its Subsidiaries;

          (j) none of Zydeco and its Subsidiaries has issued, sold, or otherwise
disposed of any of its capital stock, or granted any options, warrants, or other
rights to purchase or obtain (including upon conversion, exchange, or exercise)
any of its capital stock;

          (k) except as set forth in Section 4.08(k) of the Zydeco Disclosure
Schedule, none of Zydeco and its Subsidiaries has declared, set aside, or paid
any dividend or made any distribution with respect to its capital stock (whether
in cash or in kind) or redeemed, purchased, or otherwise acquired any of its
capital stock;

          (l)  none of Zydeco and its Subsidiaries has experienced any damage,
destruction, or loss (whether or not covered by insurance) to its property;

                                       17
<PAGE>

          (m)  except as set forth in Section 4.08(m) of the Zydeco Disclosure
Schedule, none of Zydeco and its Subsidiaries has made any loan to, or entered
into any other transaction with, any of its directors, officers, and employees;

          (n) none of Zydeco and its Subsidiaries has entered into any
employment contract or collective bargaining agreement, written or oral, or
modified the terms of any such existing contract or agreement;

          (o)  none of Zydeco and its Subsidiaries has granted any increase in
the base compensation of any of its directors or officers or any of its other
employees outside the Ordinary Course of Business;

          (p) none of Zydeco and its Subsidiaries has adopted, amended,
modified, or terminated any bonus, profit-sharing, incentive, severance, or
other plan, contract, or commitment for the benefit of any of its directors,
officers, and employees (or taken any such action with respect to any other
Employee Benefit Plan);

          (q) none of Zydeco and its Subsidiaries has made any other change in
employment terms for any of its directors, officers, and employees; and

          (r) except as set forth in Section 4.08(r) of the Zydeco Disclosure
Schedule, none of Zydeco and its Subsidiaries has delayed or postponed the
payment of accounts payable and other liabilities outside the Ordinary Course of
Business;

          (s) none of Zydeco and its Subsidiaries has cancelled, compromised,
waived, or released any right or claim (or series of related rights and claims)
either involving more than $10,000 or outside the Ordinary Course of Business;

          (t) none of Zydeco and its Subsidiaries has made or pledged to make
any charitable or other capital contribution outside the Ordinary Course of
Business;

          (u) there has not been any other occurrence, event, incident, action,
failure to act, or transaction outside the Ordinary Course of Business involving
any of Zydeco and its Subsidiaries; and

          (v)  none of Zydeco and its Subsidiaries has committed to any of the
foregoing.

     Section 4.09 Undisclosed Liabilities. None of Zydeco and its Subsidiaries
has any liability (whether asserted or unasserted, whether absolute or
contingent, whether accrued or unaccrued, whether liquidated or unliquidated,
and whether due or to become due, including any liability for Taxes), and there
is no basis for any present or future action, suit, proceeding, hearing,
investigation, charge, complaint, claim or demand against any of them giving
rise to any liability, except for liabilities set forth on the face of the
Zydeco Balance Sheet (rather than in any notes thereto).

     Except as set forth in Section 4.09 of the Zydeco Disclosure Schedule,
Zydeco does not have any liability (whether known or unknown, whether asserted
or unasserted, whether absolute or contingent, whether accrued or unaccrued,
whether liquidated or unliquidated, and whether due or to become due, including
any liability for Taxes), and there is no basis for any present or future
action, suit, proceeding, hearing, investigation, charge, complaint, claim or
demand against it giving rise to any liability, based on its Subsidiaries
operations, ownership of assets, actions or inactions.

     Section 4.10 Legal Compliance. Each of Zydeco, its Subsidiaries, and their
respective predecessors and Affiliates has complied with all applicable laws
(including rules, regulations, codes, plans, injunctions, judgments, orders,
decrees, rulings, and charges thereunder) of federal, state, local, and foreign
governments (and all agencies thereof), including all import and export laws
relating to its products and business and the payment of all customs duties or
other official charges incurred, due or owed by Zydeco or its Subsidiaries, and
no action, suit, proceeding, hearing, investigation, charge, complaint, claim,
demand, or notice has been filed or commenced against any of them alleging any
failure so to comply.

                                       18
<PAGE>

     Section 4.11  Tax Matters.

          (a) Each of Zydeco and its Subsidiaries has filed or caused to be
filed in a timely manner (within any applicable extension periods) all Tax
Returns that it was required to file. All such Tax Returns were complete and
accurate in all material respects. All Taxes owed by any of Zydeco and its
Subsidiaries (whether or not shown on any Tax Return) have been paid. None of
Zydeco and its Subsidiaries is currently the beneficiary of any extension of
time within which to file any Tax Return. No claim has ever been made by an
authority in a jurisdiction where any of Zydeco and its Subsidiaries does not
file Tax Returns that it is or may be subject to taxation by that jurisdiction.
There are no Security Interests on any of the assets of any of Zydeco and its
Subsidiaries that arose in connection with any failure (or alleged failure) to
pay any Tax.

          (b) Each of Zydeco and its Subsidiaries has withheld and paid all
Taxes required to have been withheld and paid in connection with amounts paid or
owing to any employee, independent contractor, creditor, stockholder, or other
third party.

          (c)  No director or officer (or employee responsible for Tax matters)
of any of Zydeco and its Subsidiaries expects any authority to assess any
additional Taxes for any period for which Tax Returns have been filed. There is
no dispute, claim, notice or inquiry concerning any Tax liability of any of
Zydeco or its Subsidiaries either claimed or raised by any authority in writing
or as to which any of the directors and officers (and employees responsible for
Tax matters) of each of Zydeco and its Subsidiaries has Knowledge based upon
personal contact with any agent of such authority. There are no material matters
under discussion between Zydeco or its Subsidiaries and any governmental
authority regarding claims for additional Taxes or assessments with reference to
Zydeco or its Subsidiaries or the business or property of Zydeco or its
Subsidiaries.

          (d) Section 4.11(d) of the Zydeco Disclosure Schedule lists all
federal, state, local, and foreign Tax Returns filed with respect to Zydeco and
its Subsidiaries for Taxable periods ended on or after December 31, 1996,
indicates those Tax Returns that have been audited, and indicates those Tax
Returns that currently are the subject of audit. Zydeco has delivered to DataVon
correct and complete copies of all federal Tax Returns, examination reports, and
statements of deficiencies assessed against, or agreed to by Zydeco or its
Subsidiaries since December 31, 1996. None of Zydeco and its Subsidiaries has
waived any statute of limitations in respect of Taxes or agreed to any extension
of time with respect to a Tax assessment or deficiency.

          (e) None of Zydeco and its Subsidiaries has filed a consent under Code
Section 341(f) concerning collapsible corporations. None of Zydeco and its
Subsidiaries has made any material payments, is obligated to make any material
payments, or is a party to any agreement that under certain circumstances could
obligate it to make any material payments that will not be deductible under Code
Section 280G. None of Zydeco and its Subsidiaries has been a United States real
property holding corporation within the meaning of Code Section 897(c)(2) during
the applicable period specified in Code Section 897(c)(1)(A)(ii). Each of Zydeco
and its Subsidiaries has disclosed on its federal income Tax Returns all
positions taken therein that could give rise to a substantial understatement of
federal income Tax within the meaning of Code (S)6662. None of Zydeco and its
Subsidiaries is a party to any Tax allocation or sharing agreement. None of
Zydeco and its Subsidiaries (i) has been a member of an Affiliated Group filing
a consolidated federal Tax Return (other than a group the common parent of which
was Zydeco) or (ii) has any liability for the Taxes of any Person (other than of
Zydeco or any of its Subsidiaries) under Treasury Regulation Section 1.1502-6
(or any similar provision of state, local, or foreign law), as a transferee or
successor, by contract, or otherwise.

          (f) Section 4.11(f) of the Zydeco Disclosure Schedule sets forth
estimates of the following information with respect to each of Zydeco and its
Subsidiaries (or, in the case of clause (B) below, with respect to each of the
Subsidiaries) as of the most recent practicable date: (A) the basis of Zydeco or
Subsidiary in its assets; (B) the basis of the stockholder(s) of the Subsidiary
in its stock; (C) the amount of any net operating loss, net capital loss, unused
investment or other credit, unused foreign tax, or excess charitable
contribution allocable to Zydeco or Subsidiary; and (D) the amount of any
deferred gain or loss allocable to Zydeco or Subsidiary arising out of any
Deferred Intercompany Transaction.

                                       19
<PAGE>

          (g) The unpaid Taxes of Zydeco and its Subsidiaries (i) did not, as of
December 31, 1999, exceed by any material amount the reserve for Tax liability
(rather than any reserve for deferred Taxes established to reflect timing
differences between book and Tax income) set forth on the face of the Zydeco
Balance Sheet (rather than in any notes thereto) and (ii) will not exceed by any
material amount that reserve as adjusted for operations and transactions through
the Closing Date in accordance with the past custom and practice of Zydeco and
its Subsidiaries in filing their Tax Returns.

     Section 4.12  Real Property Other Than Oil and Gas Interests.

          (a) Each of Zydeco and its Subsidiaries does not own, has never owned,
does not have, nor has it ever had any interest in any real property, other than
Oil and Gas Interests, other than pursuant to a valid lease.

          (b) Section 4.12(b) of the Zydeco Disclosure Schedule lists and
describes briefly all real property leased or subleased to each of Zydeco and
its Subsidiaries, other than Oil and Gas Interests. Zydeco has delivered to
DataVon correct and complete copies of the leases and subleases listed in
Section 4.12(b) of the Zydeco Disclosure Schedule (as amended to date). With
respect to each material lease and sublease listed in Section 4.12(b) of the
Zydeco Disclosure Schedule:

              (1)  the lease or sublease is legal, valid, binding, enforceable,
and in full force and effect in all material respects;

              (2)  the lease or sublease will continue to be legal, valid,
binding, enforceable, and in full force and effect on identical terms following
the consummation of the transactions contemplated hereby;

              (3)  no party to the lease or sublease is in breach or default,
and no event has occurred which, with notice or lapse of time, would constitute
a breach or default or permit termination, modification, or acceleration
thereunder;

              (4) no party to the lease or sublease has repudiated any provision
thereof;

              (5)  there are no disputes, oral agreements, or forbearance
programs in effect as to the lease or sublease;

              (6)  with respect to each sublease, the representations and
warranties set forth in subsections (i) through (v) above are true and correct
with respect to the underlying lease;

              (7) none of Zydeco and its Subsidiaries has assigned, transferred,
conveyed, mortgaged, deeded in trust, or encumbered any interest in the
leasehold or subleasehold;

              (8)  all facilities leased or subleased thereunder have received
all approvals of governmental authorities (including material licenses and
permits) required in connection with the operation thereof, and have been
operated and maintained in accordance with applicable laws, rules, and
regulations in all material respects;

              (9)  all facilities leased or subleased thereunder are supplied
with utilities and other services necessary for the operation of said
facilities; and

              (10) the owner of the facility leased or subleased has good and
marketable title to the parcel of real property, free and clear of any Security
Interest, easement, covenant, or other restriction, except for installments of
special easements not yet delinquent and recorded easements, covenants, and
other restrictions which do not impair the current use, occupancy, or value, or
the marketability of title, of the property subject thereto.

     Section 4.13 Title to Oil and Gas Interests. Except as set forth in Section
4.13 of the Zydeco Disclosure Schedule, Zydeco and its Subsidiaries have Good
Title to the Oil and Gas Interests.

                                       20
<PAGE>

        Section 4.14 Oil and Gas Interests of Zydeco and its Subsidiaries.
Except as set forth in Section 4.13 of the Zydeco Disclosure Schedule: (i)
neither Zydeco nor any of its Subsidiaries has been advised by any operator,
lessor or any other party of any default under any such oil and gas leases which
default has not heretofore been cured in all respects; (ii) to the best
Knowledge of the directors and officers (and employees responsible for payment
of royalties and rents) of Zydeco and its Subsidiaries, all proper and timely
payments (including but not limited to royalties, delay rentals and shut-in
royalties), due under the oil and gas leases giving rise to the Oil and Gas
Interests have been timely made and paid by the operator(s) of each such lease
or well; and (iii) Zydeco and its Subsidiaries are entitled to be paid, and are
being paid, in all material respects, their percentage of net revenue interests
included in the Oil and Gas Interests without suspense and without indemnity
other than those customarily found in the industry.

        Section 4.15  Wells.  Except as set forth in Section 4.13 of the Zydeco
Disclosure Schedule:

        (a) All of the wells included in the Oil and Gas Interests and which are
described in Section 4.15 of the Zydeco Disclosure Schedule have been drilled
and completed within the boundaries of such Oil and Gas Interests or within the
limits otherwise permitted by contract, pooling or unit agreement, lease
instrument, and by law.

        (b) All drilling and completion of the wells in such Oil and Gas
Interests and all development and operations on such Oil and Gas Interests have
been conducted in compliance with all applicable laws, ordinances, rules,
regulations and permits, and judgments, orders, and decrees of any court or
governmental body or agency.

        (c) No well included in such Oil and Gas Interests is subject to
penalties on allowables because of any overproduction (legal or illegal) which
would prevent the full legal and regular allowable (including maximum
permissible tolerance) as prescribed by any court or federal, state or local
governmental body or agency to be assigned to any such well.

        Section 4.16 Refund. Except as included or reflected on the Zydeco
Balance Sheet or as set forth in Section 4.16 of the Zydeco Disclosure Schedule:
(i) neither Zydeco nor any of its Subsidiaries is obligated by virtue of a
prepayment arrangement under any gas contract containing a "take or pay" or
similar provision, a production payment or any other arrangement to deliver any
material amount of gas or oil attributable to the Oil and Gas Interests at some
future time without then or thereafter receiving full payment therefor; and (ii)
neither Zydeco nor any of its Subsidiaries has received any funds or payments
from purchasers of production of gas under gas contracts which are subject to a
potential material refund.

        Section 4.17  Operation of Assets. Since the acquisition of Oil and Gas
Interests by Zydeco and its Subsidiaries, the Oil and Gas Interests have been
administered and maintained by Zydeco directly or through its Subsidiaries in a
reasonable manner and in accordance with generally prevailing standards of the
oil and gas industry.  Neither Zydeco nor any of its Subsidiaries are named nor
act as the operator of any other leases or properties.

        Section 4.18  Intellectual Property.

        (a) The Wavefield Patent (defined as Patent number 5,693,885, issued by
the Commissioner of Patents and Trademarks on December 2, 1997) does not
interfere with, infringe upon, misappropriate, or violate any Intellectual
Property rights of third parties, and none of the directors and officers of
Zydeco and its Subsidiaries has ever received any charge, complaint, claim,
demand, or notice alleging any such interference, infringement,
misappropriation, or violation (including any claim that any of Zydeco and its
Subsidiaries must license or refrain from using any Intellectual Property rights
of any third party). No third party has interfered with, infringed upon,
misappropriated, or violated any Intellectual Property rights related to the
Wavefield Patent.

        (b) Section 4.18(b) of the Zydeco Disclosure Schedule identifies each
license, sublicense, agreement, or permission granted by Zydeco or its
Subsidiaries to any third party relating to the Wavefield Patent.

                                       21
<PAGE>

        Section 4.19 Tangible Assets. The buildings, machinery, equipment, and
other tangible assets that Zydeco and its Subsidiaries own and lease are free
from material defects (patent and latent), have been maintained in accordance
with normal industry practice, and are in good operating condition and repair
(subject to normal wear and tear), and is suitable for the purpose for which it
presently is used .

        Section 4.20 Contracts. Section 4.20 of the Zydeco Disclosure Schedule
lists the following contracts and other agreements to which any of Zydeco and
its Subsidiaries is a party:

        (a) any agreement (or group of related agreements) for the lease of
personal property to or from any Person providing for lease payments in excess
of $1,000;

        (b) any agreement (or group of related agreements) for the purchase or
sale of raw materials, commodities, supplies, products, or other personal
property, or for the furnishing or receipt of services, the performance of which
will extend over a period of more than one year or involve consideration in
excess of $5,000;

        (c) any agreement concerning a partnership or joint venture;

        (d) any agreement (or group of related agreements) under which it has
created, incurred, assumed, or guaranteed any indebtedness for borrowed money,
or any capitalized lease obligation, in excess of $5,000 or under which it has
imposed a Security Interest on any of its assets, tangible or intangible;

        (e) any agreement concerning confidentiality or noncompetition;

        (f) any agreement, contract or understanding (including any agreement,
contract or understanding evidencing any outstanding indebtedness or other
similar obligations to Zydeco or its Subsidiaries) with any director, officer,
Affiliate or "associate" (as such term is defined in Rule 12b-2 under the
Securities Exchange Act) of Zydeco or its Subsidiaries;

        (g) any profit sharing, stock option, stock purchase, stock
appreciation, deferred compensation, severance, or other material plan or
arrangement for the benefit of its current or former directors, officers, and
employees;

        (h) any collective bargaining agreement;

        (i) any agreement for the employment of any individual on a full-time,
part-time, consulting, or other basis;

        (j) any agreement under which it has advanced or loaned any amount to
any of its directors, officers, and employees outside the Ordinary Course of
Business;

        (k) any agreement under which the consequences of a default or
termination could have a material adverse effect on the business, financial
condition, operations, results of operations, or future prospects of any of
Zydeco and its Subsidiaries; or

        (l) any other agreement (or group of related agreements) the performance
of which involves consideration in excess of $5,000.

Zydeco has delivered to DataVon a correct and complete copy of each written
agreement listed in Section 4.20 of the Zydeco Disclosure Schedule (as amended
to date) and a written summary setting forth the material terms and conditions
of each oral agreement referred to in Section 4.20 of the Zydeco Disclosure
Schedule.  With respect to each such agreement: (i) the agreement is legal,
valid, binding, enforceable, and in full force and effect in all material
respects; (ii) the agreement will continue to be legal, valid, binding,
enforceable, and in full force and effect on identical terms following the
consummation of the transactions contemplated hereby; (iii) no party is in
breach or default, and no event has occurred which with notice or lapse of time
would constitute a breach or default, or permit

                                       22
<PAGE>

termination, modification, or acceleration, under the agreement; and (iv) no
party has repudiated any provision of the agreement.

        Section 4.21 Notes and Accounts Receivable. All notes and accounts
receivable of Zydeco and its Subsidiaries listed on Section 4.21 of the Zydeco
Disclosure Schedule are reflected properly on their books and records, are valid
receivables subject to no setoffs or counterclaims, are current and collectible,
and will be collected in accordance with their terms at their recorded amounts,
subject only to the reserve for bad debts set forth on the face of the Zydeco
Balance Sheet (rather than in any notes thereto) as adjusted for operations and
transactions in the Ordinary Course of Business through the Closing Date. With
respect to the accounts receivable listed on Section 4.21 of the Zydeco
Disclosure Schedule, no chargeback allowance or cooperative advertising
allowance or related liability exists that is not fully and accurately reflected
in such accounts receivable.

        Section 4.22 Powers of Attorney. There are no outstanding powers of
attorney executed on behalf of any of Zydeco and its Subsidiaries.

        Section 4.23 Insurance. Section 4.23 of the Zydeco Disclosure Schedule
sets forth the following information with respect to each insurance policy
(including policies providing property, casualty, liability, and workers'
compensation coverage and bond and surety arrangements) with respect to which
any of Zydeco and its Subsidiaries has been a party, a named insured, or
otherwise the beneficiary of coverage at any time within the past 3 years:

        (a) the name, address, and telephone number of the agent;

        (b) the name of the insurer, the name of the policyholder, and the name
of each covered insured;

        (c) the policy number and the period of coverage;

        (d) the scope (including an indication of whether the coverage is on a
claims made, occurrence, or other basis) and amount (including a description of
how deductibles and ceilings are calculated and operate) of coverage; and

        (e) a description of any retroactive premium adjustments or other loss-
sharing arrangements.

With respect to each such insurance policy: (i) the policy is legal, valid,
binding, enforceable, and in full force and effect; (ii) the policy will
continue to be legal, valid, binding, enforceable, and in full force and effect
on identical terms following the consummation of the transactions contemplated
hereby; (iii) neither any of Zydeco and its Subsidiaries nor any other party to
the policy is in breach or default (including with respect to the payment of
premiums or the giving of notices), and no event has occurred which, with notice
or the lapse of time, would constitute such a breach or default, or permit
termination, modification, or acceleration, under the policy; and (iii) no party
to the policy has repudiated any provision thereof.  Each of Zydeco and its
Subsidiaries has been covered during the past 3 years by insurance in scope and
amount customary and reasonable for the businesses in which it has engaged
during the aforementioned period.  Section 4.23 of the Zydeco Disclosure
Schedule describes any material self-insurance arrangements affecting any of
Zydeco and its Subsidiaries.

        Section 4.24 Litigation. Section 4.24 of the Zydeco Disclosure Schedule
sets forth each instance in which any of Zydeco and its Subsidiaries (a) is
subject to any outstanding injunction, judgment, order, decree, ruling, or
charge or (b) is a party or, to its Knowledge, is Threatened to be made a party
to any action, suit, proceeding, hearing, or investigation of, in, or before any
court or quasi-judicial or administrative agency of any federal, state, local,
or foreign jurisdiction or before any arbitrator. None of the actions, suits,
proceedings, hearings, and investigations set forth in Section 4.24 of the
Zydeco Disclosure Schedule could result in any adverse change in the business,
financial condition, operations, results of operations, or future prospects of
any of Zydeco and its Subsidiaries. None of Zydeco and its Subsidiaries and the
directors and officers (and employees with responsibility

                                       23
<PAGE>

for litigation matters) of Zydeco and its Subsidiaries has any reason to believe
that any such action, suit, proceeding, hearing, or investigation may be brought
or Threatened against any of Zydeco and its Subsidiaries.

        Section 4.25 Employees. None of Zydeco and its Subsidiaries is a party
to or bound by any collective bargaining agreement, nor has it experienced any
strike or material grievance, claim of unfair labor practices, or other
collective bargaining dispute within the past three years. None of Zydeco and
its Subsidiaries has committed any material unfair labor practice. None of
Zydeco and its Subsidiaries and the directors and officers of Zydeco and its
Subsidiaries has any Knowledge of any organizational effort presently being made
or Threatened by or on behalf of any labor union with respect to employees of
Zydeco and its Subsidiaries.

        Section 4.26  Employee Benefits.

        (a) None of Zydeco and its Subsidiaries maintains or contributes, or has
ever maintained or contributed to any Employee Benefit Plan.

        (b) None of Zydeco, its Subsidiaries and the other members of the
Controlled Group of Corporations that includes Zydeco and its Subsidiaries
contributes to, ever has contributed to, or ever has been required to contribute
to any Multiemployer Plan or has any liability (whether known or unknown,
whether asserted or unasserted, whether absolute or contingent, whether accrued
or unaccrued, whether liquidated or unliquidated, and whether due or to become
due), including any withdrawal liability, under any Multiemployer Plan.

        (c) None of Zydeco and its Subsidiaries maintains or ever has maintained
or contributes, ever has contributed, or ever has been required to contribute to
any Employee Welfare Benefit Plan providing medical, health, or life insurance
or other welfare-type benefits for current or future retired or terminated
employees, their spouses, or their dependents (other than in accordance with
Code Section 4980B).

        (d) No current or former employee, officer and director of Zydeco and
its Subsidiaries has any outstanding agreement, contract or understanding with
respect to Zydeco or its Subsidiaries that provides for bonus payments.

        Section 4.27 Guaranties. None of Zydeco and its Subsidiaries is a
guarantor or otherwise is responsible for any liability or obligation (including
indebtedness) of any other Person.

        Section 4.28  Environment, Health, and Safety.

        (a) Each of Zydeco and its Subsidiaries is, and at all times has been,
in full compliance with, and has not been and is not in Contravention of or
liable under, any Environmental Law or Occupational Safety and Health Law.
Neither any of Zydeco and its Subsidiaries has any basis to expect, nor has any
of them or any other Person for whose conduct they are or may be held
responsible received, any actual or Threatened Order, notice, or other
communication from (i) any Governmental Body or other Person acting in the
public interest, or (ii) the current or prior owner or operator of any Facility,
of any actual or potential violation or failure to comply with any Environmental
Law, or of any actual or Threatened obligation to undertake or bear the cost of
any Environmental, Health, and Safety Liabilities with respect to any Facility
or other property or asset (whether real, personal, or mixed) in which any of
Zydeco or its Subsidiaries has had an interest, or with respect to any property
or Facility at or to which Hazardous Materials were generated, manufactured,
refined, transferred, imported, used, or processed by Zydeco, its Subsidiaries
or any other Person for whose conduct they are or may be held responsible, or
from which Hazardous Materials have been transported, treated, stored, handled,
transferred, disposed, recycled, or received.

        (b) There are no pending or Threatened, claims, Encumbrances or other
restrictions of any nature, resulting from any Environmental, Health, and Safety
Liabilities or arising under or pursuant to any Environmental Law or
Occupational Safety and Health Law, with respect to or affecting any Facilities
or any other properties and assets (whether real, personal, or mixed) in which
any of Zydeco or its Subsidiaries has or had an interest.

                                       24
<PAGE>

        (c) Neither any of Zydeco or its Subsidiaries has any basis to expect,
nor has any of them or any other Person for whose conduct they are or may be
held responsible, received, any citation, directive, inquiry, notice, Order,
summons, warning, or other communication that relates to Hazardous Activity,
Hazardous Materials, or any actual, alleged, possible or potential Contravention
of or failure to comply with any Environmental Law or Occupational Safety and
Health Law, or of any actual, alleged, possible or potential obligation to
undertake or bear the cost of any Environmental, Health, and Safety Liabilities
with respect to any Facility or other property or asset (whether real, personal,
or mixed) in which any of Zydeco or its Subsidiaries had an interest, or with
respect to any property or facility to or by which Hazardous Materials
generated, manufactured, refined, transferred, imported, used, or processed by
any of Zydeco, its Subsidiaries, or any other Person for whose conduct they are
or may be held responsible, have been transported, treated, stored, handled,
transferred, disposed, recycled, or received. Neither any of Zydeco or its
Subsidiaries, nor any other Person for whose conduct they are or may be held
responsible, has any Environmental, Health, and Safety Liabilities with respect
to any Facility or with respect to any other property or asset (whether real,
personal, or mixed) in which any of Zydeco or its Subsidiaries (or any
predecessor), has or had an interest, or at any property geologically or
hydrologically adjoining any Facility or any such other property or asset.

        (d) There are no Hazardous Materials present on or in the Environment at
any Facility or at any geologically or hydrologically adjoining property,
including any Hazardous Materials contained in barrels, above or underground
storage tanks, landfills, land deposits, dumps, equipment (whether moveable or
fixed) or other containers, either temporary or permanent, and deposited or
located in land, water, sumps, or any other part of any Facility or such
adjoining property, or incorporated into any structure therein or thereon. None
of Zydeco, its Subsidiaries, any other Person for whose conduct they are or may
be held responsible, or any other Person has permitted or conducted, or is aware
of, any Hazardous Activity conducted with respect to any Facility or other
property or asset (whether real, personal, or mixed) in which any of Zydeco or
its Subsidiaries has or had an interest.

        (e) There has been no Release or, to Zydeco's Knowledge, Threat of
Release, of any Hazardous Materials at or from any Facility or at any other
location where any Hazardous Materials were generated, manufactured, refined,
transferred, produced, imported, used, or processed from or by any Facility, or
from any other property or asset (whether real, personal, or mixed) in which any
of Zydeco or its Subsidiaries has or had an interest, or any geologically or
hydrologically adjoining property, whether by any of Zydeco, its Subsidiaries,
or any other Person.

        (f) Zydeco has delivered to DataVon true and complete copies and results
of any reports, studies, analyses, tests, or monitoring possessed or initiated
by any of Zydeco or its Subsidiaries pertaining to Hazardous Materials or
Hazardous Activities in, on, or under any Facilities, or concerning compliance
by any of Zydeco, its Subsidiaries, or any other Person for whose conduct they
are or may be held responsible, with Environmental Laws.

        Section 4.29 Certain Business Relationships With Zydeco. Except as
disclosed in Section 4.29 of the Zydeco Disclosure Schedule, none of the
directors and officers of Zydeco and its Subsidiaries and their Affiliates has
been involved in any business arrangement or relationship with Zydeco or its
Subsidiaries within the past 24 months, and none of the directors and officers
of Zydeco and its Subsidiaries and their Affiliates owns any asset, tangible or
intangible, which is used in the business of Zydeco or its Subsidiaries.

        Section 4.30 Change of Control. Zydeco and its Subsidiaries are not a
party to any agreement, contract, obligation, or undertaking which contains a
"change in control," "potential change in control" or similar provision and the
consummation of the transactions contemplated hereby will not (either alone or
upon the occurrence of any additional acts or events) result in any payment
(whether of severance pay or otherwise) becoming due from Zydeco and its
Subsidiaries to any Person, materially increase any benefits otherwise payable
by Zydeco or any of its Subsidiaries, or result in the acceleration of the time
of payment or vesting of any such benefits.

        Section 4.31 Certain Business Practices. Zydeco and its Subsidiaries
and, to the Knowledge of Zydeco, each director, officer, authorized agent or
employee of Zydeco or any of its Subsidiaries have not, directly or indirectly,
(a) used any funds for unlawful contributions, gifts, entertainment or other
unlawful expenses relating to

                                       25
<PAGE>

political activity, (b) made any unlawful payment to foreign or domestic
government officials or employees or to foreign or domestic political parties or
campaigns or violated any provision of the Foreign Corrupt Practices Act of
1977, as amended, (c) made any other unlawful payment, (d) violated any of the
provisions of Section 999 of the Code or Section 8 of the Export Administration
Act, as amended, or (e) established or maintained any fund or asset that has not
been recorded in the books and records of Zydeco and its Subsidiaries.

        Section 4.32 Parachute Payments. Zydeco has not entered into any
agreement that would result in the making of "parachute payments," as defined in
Section 280G of the Code, to any Person.

        Section 4.33 Information Statement. The information supplied or to be
supplied by or on behalf of Zydeco for inclusion or incorporated by reference in
the Zydeco information statement pursuant to Section 14(f) of the Exchange Act,
in definitive form (the "Information Statement"), will not, at the date mailed
to the Zydeco stockholders, contain any untrue statement of a material fact or
omit to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they are made, not misleading. The Information Statement, insofar as it relates
to Zydeco, will comply as to form in all material respects with the applicable
provisions of the Exchange Act and rules and regulations thereunder.

        Section 4.34 Disclosure. The representations and warranties contained in
this Article 4 do not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements and
information contained in this Article 4 not misleading.

                                   ARTICLE 5

                             PRE-CLOSING COVENANTS

        The Parties agree as follows with respect to the period between the
execution of this Agreement and the Closing.

        Section 5.01 General. Each of the Parties will use his, her or its
reasonable best efforts to take all actions and to do all things necessary,
proper, or advisable in order to consummate and make effective the transactions
contemplated by this Agreement (including satisfaction, but not waiver, of the
closing conditions set forth in Article 7).

        Section 5.02 Notices and Consents. Each of Zydeco and its Subsidiaries
shall give any notices to third parties, and each of Zydeco and its Subsidiaries
shall use its best efforts to obtain any third party consents, that DataVon
reasonably may request in connection with the matters referred to in Section
4.03. Each of the Parties will give any notices to, make any filings with, and
use its reasonable best efforts to obtain any authorizations, consents, and
approvals of governments and governmental agencies in connection with the
matters referred to in Section 4.03.

        Section 5.03 Operation of Business. Each of (i) Zydeco and its
Subsidiaries, and (ii) DataVon, shall not engage in any practice, take any
action, or enter into any transaction outside the Ordinary Course of Business.
Without limiting the generality of the foregoing, Zydeco and its Subsidiaries
and DataVon shall not (a) declare, set aside, or pay any dividend or make any
distribution with respect to its capital stock or redeem, purchase, or otherwise
acquire any of its capital stock, (b) become a party to any agreement of the
type of referred to in Section 4.20 (only with respect to Zydeco and its
Subsidiaries), or (c) otherwise engage in any practice, take any action, or
enter into any transaction of the sort described in Section 5.07 (only with
respect to Zydeco and its Subsidiaries).

        Section 5.04  Preservation of Business.  Each of (i) Zydeco and its
Subsidiaries, and (ii) DataVon, shall keep its business and properties
substantially intact, including its present operations, physical facilities,
working conditions, and relationships with lessors, licensors, suppliers,
customers, and employees.

        Section 5.05 Full Access. (a) Each of Zydeco and its Subsidiaries shall
permit representatives of DataVon to have full access at all reasonable times,
and in a manner so as not to interfere with the normal business operations

                                       26
<PAGE>

of Zydeco, to all premises, properties, personnel, books, records (including Tax
records), contracts, and documents of or pertaining to Zydeco and its
Subsidiaries.

        (b) DataVon shall permit representatives of Zydeco to have full
access at all reasonable times, and in a manner so as not to interfere with the
normal business operations of DataVon, to all premises, properties, personnel,
books, records (including Tax records), contracts, and documents of or
pertaining to DataVon.

        Section 5.06  Notice of Developments. DataVon and Zydeco will give
prompt written notice to the other party of any adverse development causing a
breach of any of the representations and warranties in Article 3 or 4,
respectively. No disclosure by any Party pursuant to this Section 5.06, however,
shall be deemed to amend or supplement the DataVon Disclosure Schedule or the
Zydeco Disclosure Schedule, as applicable, or to prevent or cure any
misrepresentation, breach of warranty, or breach of covenant.

        Section 5.07  Exclusivity.

        (a) Zydeco agrees that it, prior to the Effective Time, shall not,
directly or indirectly, nor shall it permit any of its Subsidiaries to, nor
shall it authorize or permit any director, officer, employee or agent of, or any
investment banker, attorney, accountant or other advisor or representative of,
Zydeco or any of its Subsidiaries (collectively, the "Zydeco Representatives")
to, directly or indirectly through another Person, solicit, initiate, encourage,
induce or facilitate the making, submission or announcement of any Acquisition
Proposal, or participate in any discussions or negotiations regarding, or
furnish to any Person any information with respect to, or take any other action
to facilitate any inquiries or the making of any proposal that constitutes, or
would reasonably be expected to lead to, any Acquisition Proposal, or approve,
endorse or recommend any Acquisition Proposal, or enter into any letter of
intent, agreement in principle, acquisition agreement or other document or
contract contemplating or otherwise relating to an Acquisition Proposal,
provided, however, that, the foregoing shall not prohibit Zydeco from furnishing
information to or entering into discussions or negotiations with, any Person
that makes an unsolicited bona fide proposal to enter into a business
combination with Zydeco pursuant to an Acquisition Proposal which the board of
directors of Zydeco (or any committee thereof considering such proposal) in good
faith determines is reasonably likely to be more favorable to the stockholders
of Zydeco than the transactions contemplated by this Agreement (a "Superior
Proposal"), so long as:

                (i)    prior to furnishing any information to, or entering into
        discussions or negotiations with such a Person, Zydeco provides twenty-
        four (24) hours' advance written notice to DataVon to the effect that it
        is furnishing information to, or entering into substantive discussions
        or negotiations with, a Person from whom Zydeco shall have received an
        executed confidentiality agreement in form and substance satisfactory to
        DataVon prior to furnishing such information;

                (ii)   such notice shall include the terms and conditions of
        such Acquisition Proposal or any agreement proposed by, or any
        information supplied to, any such Person;

                (iii)  prior to furnishing any nonpublic information to any such
        Person, Zydeco furnishes such nonpublic information to DataVon (to the
        extent that such nonpublic information has not been previously furnished
        by Zydeco to DataVon);

                (iv)   neither Zydeco nor any of its Subsidiaries nor any of the
        Zydeco Representatives shall have violated any of the restrictions set
        forth in this Section 5.07;

                (v)    such unsolicited bona fide proposal relating to a
        Superior Proposal is made by a third party that the board of directors
        of Zydeco (or any committee thereof considering such proposal)
        determines in good faith has the good faith intent to proceed with
        negotiations to consider such Superior Proposal;

                                       27
<PAGE>

                (vi)   the board of directors of Zydeco (or any committee
        thereof considering such proposal), after duly considering the written
        advice of outside legal counsel to Zydeco, determines in good faith that
        such action is required for the Board of Directors of Zydeco to comply
        with its fiduciary duties to stockholders imposed by applicable law; and

                (vii)  Zydeco keeps DataVon informed in all material respects of
        the status and terms of any such negotiations or discussions (including
        without limitation the identity of the Person with whom such
        negotiations or discussions are being held) and provides DataVon copies
        of such written proposals and any amendments or revisions thereto or
        correspondence related thereto.

        (b) Zydeco shall notify DataVon orally and in writing of the fact that
it has received inquiries, offers or proposals that it reasonably believes to be
bona fide with respect to an Acquisition Proposal within twenty-four (24) hours
after the receipt thereof. Zydeco will immediately cease and cause to be
terminated any existing activities, discussions or negotiations with any other
Person that have been conducted heretofore with respect to a potential
Acquisition Proposal. Zydeco agrees to inform the Zydeco Representatives of the
obligations undertaken in this Section 5.07; provided, however, that nothing
contained in this Agreement shall prevent the board of directors of Zydeco from
referring any third-party to this Section 5.07.

        (c) Zydeco agrees not to release or permit the release of any Person
from, or to waive or permit the waiver of any provision of, any confidentiality,
"standstill" or similar agreement to which Zydeco or any of its Subsidiaries is
a party, and will use its best efforts to enforce or cause to be enforced each
such agreement at the request of DataVon.

        (d) Except as expressly permitted by this Section 5.07, neither the
board of directors of Zydeco nor any committee thereof shall (A) withdraw,
modify or change, or propose publicly to withdraw, modify or change, in a manner
adverse to DataVon, the approval by such board of directors or such committee of
the board of directors, approving or taking such action with respect to the
Merger or this Agreement, (B) approve or recommend, or propose publicly to
approve or recommend, any Superior Proposal or (C) cause Zydeco to enter into
any letter of intent, agreement in principle, acquisition agreement or other
similar agreement (each, an "Acquisition Agreement") related to any Acquisition
Proposal. Notwithstanding the foregoing, in the event that the Board of
Directors of Zydeco (or any committee thereof considering an Acquisition
Proposal) determines in good faith, after consultation with outside counsel,
that in light of a Superior Proposal it is necessary to do so in order to act in
a manner consistent with its fiduciary duties to the stockholders of Zydeco
under applicable law, the board of directors of Zydeco may (subject to this and
the following sentences) withdraw, modify or change its recommendation of the
Merger, but only after twenty-four (24) hours following DataVon's receipt of
written notice advising DataVon that the board of directors of Zydeco is
prepared to do so, and only if, during such twenty-four (24) hour period, Zydeco
and its advisors shall have negotiated in good faith with DataVon to make such
adjustments in the terms and conditions of this Agreement as would enable
DataVon to proceed with the transactions contemplated herein on such adjusted
terms.

        (e) Nothing contained in this Section 5.07 shall prohibit Zydeco from
taking and disclosing to its stockholders a position contemplated by Rules 14d-9
and/or 14e-2(a) promulgated under the Exchange Act or from making any disclosure
to the stockholders of Zydeco if, in the good faith judgment of the board of
directors of Zydeco, after consultation with outside counsel, failure so to
disclose would be inconsistent with its obligations under applicable law.

        For purposes of this Section 5.07, "Acquisition Proposal" means any
offer or proposal for (whether or not in writing and whether or not delivered to
the stockholders of Zydeco generally), from any Person relating to any (a)
direct or indirect acquisition or purchase of assets (x) that constitute 15% or
more of the assets of Zydeco and its Subsidiaries taken as a whole or (y) for
which 15% or more of the net revenues or net income of Zydeco and its
Subsidiaries taken as a whole are attributable, (b) direct or indirect
acquisition or purchase of 15% or more of any class of equity securities of
Zydeco or any of its Subsidiaries whose business constitutes 15% or more of the
net revenues, net income or assets of Zydeco and its Subsidiaries, taken as a
whole, (c) tender offer or exchange offer that if consummated would result in
any Person beneficially owning 15% more of any class of equity securities of

                                       28
<PAGE>

Zydeco or any of its Subsidiaries whose business constitutes 15% or more of the
net revenues, net income or assets of Zydeco and its Subsidiaries, taken as a
whole, or (d) merger, consolidation, business combination, recapitalization,
liquidation, dissolution or similar transaction involving Zydeco or any of its
Subsidiaries whose business constitutes 15% or more of the net revenues, net
income or assets of Zydeco and its Subsidiaries, taken as a whole, other than
the transactions contemplated by this Agreement.

        Section 5.08 Filing of Current Report on Form 8-K. Promptly after
execution of this Agreement, Zydeco shall file if required or permitted under
the Exchange Act a Current Report on Form 8-K ("8-K") with the SEC to report the
proposed Merger and terms thereof.

        Section 5.09 Composition of Zydeco and Surviving Corporation Board and
Officers at Effective Time. Zydeco will take all necessary actions to ensure
that, at the Effective Time, the Board of Directors of Zydeco is comprised of,
and the officer positions of Zydeco are filled with, the persons set forth on
Exhibit E of the Disclosure Schedule, each to serve until his or her successor
is elected and qualified or until the earlier termination, resignation or
removal.

        Section 5.10 Information Statement. Zydeco, with the cooperation and
assistance of DataVon and its counsel, will prepare, file with the SEC and
distribute to the holders of Zydeco Common Stock the Information Statement
pursuant to the applicable rules and regulations under the Exchange Act no later
than five (5) Business Days after the date of this Agreement.

        Section 5.11 Section 16(b) Board Approval. Prior to Closing, the Board
of Directors of Zydeco shall, by resolution duly adopted by such Board of
Directors or a duly authorized committee of "non-employee directors" thereof,
approve and adopt, for purposes of exemption from "short-swing" liability under
Section 16(b) of the Exchange Act, the acquisition of Zydeco Common Stock and/or
Zydeco Preferred Stock at the Effective Time by officers and directors of
DataVon who become, prior to, at, or following the Effective Time of the Merger,
officers or directors of Zydeco as a result of the conversion of shares of
DataVon Shares in the Merger and the assumption of any DataVon options or
warrants by Zydeco at the Effective Time. Such resolution shall set forth the
name of the applicable "insiders" for purposes of Section 16 of the Exchange
Act, the number of securities to be acquired by each individual, that the
approval is being granted to exempt the transaction under Rule 16b-3 under the
Exchange Act, and, for the options and warrants of DataVon to be assumed by
Zydeco at the Effective Time, the material terms of the options and warrants to
purchase Zydeco Common Stock acquired by such insiders as a result of the
assumption by Zydeco of such options and warrants.

        Section 5.12 Confidentiality. Each of Zydeco and its Subsidiaries agrees
that, until the earlier of (i) two years from the date of this Agreement and
(ii) the Effective Time:

        (a) each of Zydeco and its Subsidiaries will treat and hold as such all
of the Confidential Information, refrain from using any of the Confidential
Information except in connection with this Agreement, and deliver promptly to
DataVon or destroy, at the request and option of DataVon, all tangible
embodiments (and all copies) of the Confidential Information, including in
electric or magnetic form, which are in his, her or its possession;

        (b) in the event that any of Zydeco and its Subsidiaries is requested or
required (by oral question or request for information or documents in any legal
proceeding, interrogatory, subpoena, civil investigative demand, or similar
process) to disclose any Confidential Information, that Zydeco and its
Subsidiaries will notify DataVon promptly of the request or requirement so that
DataVon may seek an appropriate protective order or waive compliance with the
provisions of this Section 5.12; and

        (c) if, in the absence of a protective order or the receipt of a waiver
hereunder, any of Zydeco or its Subsidiaries is, on the advice of counsel,
compelled to disclose any Confidential Information to any tribunal or else stand
liable for contempt, that Zydeco or its Subsidiaries may disclose the
Confidential Information to the tribunal; provided, however, that the disclosing
party shall use his, her or its reasonable best efforts to obtain, at the

                                       29
<PAGE>

reasonable request of DataVon, an order or other assurance that confidential
treatment will be accorded to such portion of the Confidential Information
required to be disclosed as DataVon shall designate.

        Section 5.13 Restructuring of Exploration. As soon as practicable after
the execution of this Agreement and in any event prior to the Effective Time,
Zydeco shall take all action to cause all assets and liabilities used or
incurred in the oil and gas business or oil and gas technology business of
Zydeco, including the capital stock of Wavefield Image, Inc. and all cash
balances of Zydeco, to be contributed to Exploration; provided, however that any
cash and cash equivalents received upon exercise of any options or warrants of
Zydeco from and after April 1, 2000 shall remain with Zydeco. Notwithstanding
anything set forth herein, Zydeco's rights as sole stockholder of Exploration
shall not be restricted or limited in any manner. Section 5.13 of the Zydeco
Disclosure Schedule sets forth a list of such assets and liabilities anticipated
to be transferred pursuant to this Section 5.13.

        Section 5.14 Filing of Certificate of Designations. Prior to the Closing
Date, the board of directors of Zydeco will approve the Certificate of
Designations to fix the terms of the Zydeco Preferred Stock, as set forth in
Exhibit D hereto, and file the certificate with the Secretary of State of the
State of Delaware.

                                   ARTICLE 6

                            POST-CLOSING COVENANTS.

The Parties agree as follows with respect to the period following the Closing.

        Section 6.01 General. In case at any time after the Closing any further
action is necessary to carry out the purposes of this Agreement, each of the
Parties will take such further actions (including the execution and delivery of
such further instruments and documents) as any other Party reasonably may
request, all at the sole cost and expense of the requesting Party.

        Section 6.02 Transition. None of Zydeco and its Subsidiaries will take
any action that is designed or intended to have the effect of discouraging any
lessor, licensor, customer, supplier, or other business associate of Zydeco and
its Subsidiaries from maintaining the same business relationships with Zydeco
and its Subsidiaries after the Closing as it maintained with Zydeco and its
Subsidiaries prior to the Closing.

        Section 6.03 Tax Payment. Notwithstanding anything herein to the
contrary, DataVon and/or Zydeco shall pay the DataVon stockholders an amount
equal to any liability for Taxes owed by the DataVon stockholders that are
attributable to income reported on DataVon's 1999 Tax Return and the short-
period taxable year 2000 of DataVon ending on the Closing Date. Such payment may
be made either pre- or post-Closing. In addition, notwithstanding anything
herein to the contrary, to the extent not previously paid, Zydeco shall issue
DataVon Stockholder a non-interest bearing note payable on demand for the
estimated liability for Taxes owed by the DataVon stockholders pursuant to this
Section 6.03, no later than July 15, 2000.

        Section 6.04 Restrictions on Certain Intercompany Transactions. From and
after the Effective Time and for a period ended nine months from the Effective
Time or such earlier date as Exploration shall cease to be a Subsidiary of
Zydeco, Zydeco shall not, without the unanimous consent of the Board of
Directors of Exploration, take any action to cause cash or cash equivalents to
be transferred, sold or exchanged, whether by dividend or otherwise, from
Exploration to Zydeco or any other Subsidiary of Zydeco (other than a Subsidiary
of Exploration) except for payment or reimbursement to Zydeco or such Subsidiary
for any liabilities to which Zydeco and its Subsidiaries may be or become
subject relating to or arising out of the assets, business, operations, debts or
liabilities of Exploration, whether arising prior to, concurrent with or after
the Merger.

                                       30
<PAGE>

                                   ARTICLE 7

                       CONDITIONS TO OBLIGATION TO CLOSE

        Section 7.01 Conditions to Obligation of DataVon. The obligation of
DataVon to consummate the transactions to be performed by it in connection with
the Closing is subject to satisfaction of the following conditions:

        (a) the representations and warranties set forth in Article 4 shall be
true and correct in all material respects at and as of the Closing Date;

        (b) Zydeco and its Subsidiaries shall have performed and complied with
all of their covenants hereunder in all material respects through the Closing;

        (c) Zydeco and its Subsidiaries shall have procured all of the material
third party consents specified in Section 5.02;

        (d) no action, suit, or proceeding shall be pending or Threatened before
any court or quasi-judicial or administrative agency of any federal, state,
local, or foreign jurisdiction or before any arbitrator wherein an unfavorable
injunction, judgment, order, decree, ruling, or charge would (i) prevent
consummation of any of the transactions contemplated by this Agreement, (ii)
cause any of the transactions contemplated by this Agreement to be rescinded
following consummation, (iii) affect adversely the right of DataVon shareholders
to own Zydeco Common Stock and/or Zydeco Preferred Stock shares and to control
Zydeco and its Subsidiaries, or (iv) affect materially and adversely the right
of Zydeco and its Subsidiaries to own its assets and to operate its businesses
(and no such injunction, judgment, order, decree, ruling, or charge shall be in
effect);

        (e) Zydeco and its Subsidiaries shall have delivered to DataVon a
certificate to the effect that each of the conditions specified above in Section
7.01(a)-(d) is satisfied in all respects;

        (f) the Parties, Zydeco and its Subsidiaries shall have received all
other material authorizations, consents, and approvals of governments and
governmental agencies referred to in Section 4.03;

        (g) DataVon shall have received from counsel or, in the case of clause
(i), the tax accountants of Zydeco: (i) a tax opinion in form and substance as
set forth in Exhibit B attached hereto, and (ii) an opinion in form and
substance as set forth in Exhibit C attached hereto, each addressed to DataVon
and dated as of the Closing Date;

        (h) Zydeco and its Subsidiaries shall have delivered to DataVon releases
from each of its directors and officers to the effect that each director and
officer of Zydeco and its Subsidiaries remises, releases, and forever
discharges, other than with respect to the obligations arising on or after the
Closing Date under this Agreement: (i) Zydeco, its Subsidiaries and Affiliates
and (ii) DataVon and its Affiliates, and any of their respective heirs,
executors, administrators, successors and assigns (collectively, "Releases"),
from all liability whatsoever (whether actual or contingent) which may be owing
to such director or officer, including without limitation, any and all claims,
demands, proceedings, causes of action, awards, decisions, injunctions,
judgments, orders, rulings, subpoenas, verdicts, obligations, contracts,
agreements, debts and liabilities whatsoever, whether in law or equity
(including any right of contribution), whether arising under contract or
arrangement, by operation of law or otherwise, existing or arising from any acts
or events occurring or failing to occur, or alleged to have occurred or to have
failed to occur, or any conditions existing or alleged to have existed on or
before Closing;

        (i) the persons listed in Exhibit E shall have been elected directors of
Zydeco and its Subsidiaries, and the current directors and officers of Zydeco
and its Subsidiaries shall have resigned their respective board and officer
positions;

                                       31
<PAGE>

        (j) at least ten (10) days prior to the Closing Date, Zydeco has mailed
to its stockholders of record and filed with the SEC the Information Statement,
in compliance with the requirements of Section 14(f) of the Exchange Act;

        (k) At Closing, DataVon shall have received from Zydeco:

            (1) all documents, books (including minute books, stock certificate
books, stock ledgers and the corporate seal), records (including Tax records),
agreements, and financial data of any sort relating to Zydeco and its
Subsidiaries;

            (2) a certified copy of the Certificate of Incorporation of Zydeco
(including the Certificate of Designations related to the Zydeco Preferred
Stock) as in effect immediately prior to the Effective Time certified as of a
recent date by the Secretary of State of the State of Delaware;

            (3) certificates, as of the most recent practicable dates, as to the
corporate good standing of Zydeco and its Subsidiaries issued by the Secretary
of State of the State of Delaware and any other state in which Zydeco and its
Subsidiaries are required to be qualified or licensed to transact business,
confirming such good standing on or immediately prior to the Closing Date;

            (4) a copy of the by-laws of Zydeco in effect on the Closing Date
certified by the Secretary of Zydeco as of the Closing Date;

            (5) resolutions of the Board of Directors of Zydeco and Zydeco Sub,
authorizing and approving all matters in connection with this Agreement
(including matters set forth in Section 5.11) and the transactions contemplated
hereby, certified by the Secretary of Zydeco as of the Closing Date;

            (6) stock certificates representing the Zydeco Common Stock and
Zydeco Preferred Stock issuable pursuant to Article 2 upon presentation of the
Certificates; and

            (7) such other documents as DataVon may reasonably request;

        (l) the contracts and agreements listed on Section 7.01(l) of the Zydeco
Disclosure Schedule shall have been terminated; and

        (m) all actions to be taken by Zydeco in connection with consummation of
the transactions contemplated hereby and all certificates, opinions,
instruments, and other documents required to effect the transactions
contemplated hereby will be reasonably satisfactory in form and substance to
DataVon.

DataVon may waive any condition specified in this Section 7.01 if it executes a
writing so stating at or prior to the Closing.

        Section 7.02 Conditions to Obligation of Zydeco. The obligation of
Zydeco to consummate the transactions to be performed by them in connection with
the Closing is subject to satisfaction of the following conditions:

        (a) the representations and warranties set forth in Article 3 shall be
true and correct in all material respects at and as of the Closing Date;

        (b) DataVon shall have performed and complied with all of its covenants
hereunder in all material respects through the Closing;

        (c) no action, suit, or proceeding shall be pending before any court or
quasi-judicial or administrative agency of any federal, state, local, or foreign
jurisdiction or before any arbitrator wherein an unfavorable injunction,
judgment, order, decree, ruling, or charge would (i) prevent consummation of any
of the

                                       32
<PAGE>

transactions contemplated by this Agreement or (ii) cause any of the
transactions contemplated by this Agreement to be rescinded following
consummation (and no such injunction, judgment, order, decree, ruling, or charge
shall be in effect);

        (d) DataVon shall have delivered to Zydeco a certificate to the effect
that each of the conditions specified above in Section 7.02(a)-(c) is satisfied
in all respects;

        (e) the Parties and Zydeco shall have received all other material
authorizations, consents, and approvals of governments and governmental agencies
referred to in Section 4.03; and

        (f) all actions to be taken by DataVon in connection with consummation
of the transactions contemplated hereby and all certificates, opinions,
instruments, and other documents required to effect the transactions
contemplated hereby will be reasonably satisfactory in form and substance to
Zydeco.

Zydeco may waive any condition specified in this Section 7.02 if they execute a
writing so stating at or prior to the Closing.

                                   ARTICLE 8

                                  TERMINATION

        Section 8.01 Termination of Agreement. Certain of the Parties may
terminate this Agreement as provided below:

        (a) Zydeco and DataVon may terminate this Agreement by mutual written
consent at any time prior to the Closing;

        (b) DataVon may terminate this Agreement by giving written notice to
Zydeco at any time prior to the Closing (i) in the event any of Zydeco and its
Subsidiaries has breached any material representation, warranty, or covenant
contained in this Agreement in any material respect, DataVon has notified Zydeco
of the breach, and the breach has continued without cure for a period of 10
(ten) days after the notice of breach or (ii) if the Closing shall not have
occurred on or before June 30, 2000, by reason of the failure of any condition
precedent under Section 7.01 hereof (unless the failure results primarily from
DataVon itself breaching any representation, warranty, or covenant contained in
this Agreement); and

        (c) Zydeco may terminate this Agreement by giving written notice to
DataVon at any time prior to the Closing (i) in the event DataVon has breached
any material representation, warranty, or covenant contained in this Agreement
in any material respect, Zydeco has notified DataVon of the breach, and the
breach has continued without cure for a period of 10 (ten) days after the notice
of breach or (ii) if the Closing shall not have occurred on or before June 30,
2000, by reason of the failure of any condition precedent under Section 7.02
hereof (unless the failure results primarily from any of Zydeco and its
Subsidiaries themselves breaching any representation, warranty, or covenant
contained in this Agreement).

        Section 8.02 Effect of Termination. If any Party terminates this
Agreement pursuant to Section 8.01, all rights and obligations of the Parties
hereunder shall terminate without any liability of any Party to any other Party
(except for any liability of any Party then in breach); provided, however, that
the confidentiality provisions contained in Section 5.12 shall survive
termination.

                                   ARTICLE 9

                                 MISCELLANEOUS

        Section 9.01 Press Releases and Public Announcements. No Party shall
issue any press release or make any public announcement relating to the subject
matter of this Agreement prior to the Closing without the prior

                                       33
<PAGE>

written approval of Zydeco and DataVon, provided, however, that any Party may
make any public disclosure it believes in good faith is required by applicable
law or any listing or trading agreement concerning its publicly-traded
securities (in which case the disclosing Party will use its reasonable best
efforts to advise the other Parties prior to making the disclosure).

        Section 9.02 No Third Party Beneficiaries. This Agreement shall not
confer any rights or remedies upon any Person other than the Parties and their
respective successors and permitted assigns, except for Section 6.03.

        Section 9.03  Entire Agreement.  This Agreement (including the documents
referred to herein) constitutes the entire agreement among the Parties and
supersedes any prior understandings, agreements, or representations by or among
the Parties, written or oral, to the extent they relate in any way to the
subject matter hereof, except for the Confidentiality Agreement by and between
Zydeco and DataVon, dated April, 2000.

        Section 9.04 Succession and Assignment. This Agreement shall be binding
upon and inure to the benefit of the Parties named herein and their respective
successors and permitted assigns. No Party may assign either this Agreement or
any of his, her or its rights, interests, or obligations hereunder without the
prior written approval of Zydeco and DataVon.

        Section 9.05 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together will constitute one and the same instrument.

        Section 9.06 Headings. The section headings contained in this Agreement
are inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

        Section 9.07 Notices. All notices, requests, demands, claims, and other
communications hereunder will be in writing. Any notice, request, demand, claim,
or other communication hereunder shall be deemed duly given if (and then two
business days after) it is sent by (a) confirmed facsimile; (b) overnight
delivery; or (c) registered or certified mail, return receipt requested, postage
prepaid, and addressed to the intended recipient as set forth below:
<TABLE>
<CAPTION>
<S>                                             <C>
        If to DataVon:                           Copy to:

        DataVoN Inc.                             Baker & McKenzie
        635 West Campbell Road, Suite 130        1301 McKinney, Suite 3300
        Richardson, Texas  75080                 Houston, Texas 77010-3019
        Attn:  Hugh Simpson                      Attn:  Amar Budarapu
        Telephone: 972/783-0284                  Telephone: 713/427-5014
        Facsimile: 972/783-2573                  Facsimile: 713/427-5099

                                                 Mabel Simpson
                                                 635 West Campbell Road, Suite 130
                                                 Richardson, Texas  75080
                                                 Telephone:  972/783-0284
                                                 Facsimile:  972/783-2573

        If to Zydeco:                            Copy to:

        Zydeco Energy, Inc.                      Andrews & Kurth L.L.P.
        2170 Plaza of the Americas               600 Travis, Suite 4200
        North Tower                              Houston, Texas  77002
        700 N. Pearl St.                         Attn:  James M. Prince
        Dallas, Texas  75201                     Telephone: 713/220-4200
        Attn: Sam B. Myers, Jr.                  Facsimile: 713/220-4285
        Telephone: 214/999-9300
        Facsimile: 214/999-9301
</TABLE>

                                       34
<PAGE>

Any Party may send any notice, request, demand, claim, or other communication
hereunder to the intended recipient at the address set forth above using any
other means (including personal delivery, expedited courier, messenger service,
telecopy, telex, ordinary mail, or electronic mail), but no such notice,
request, demand, claim, or other communication shall be deemed to have been duly
given unless and until it actually is received by the intended recipient. Any
Party may change the address to which notices, requests, demands, claims, and
other communications hereunder are to be delivered by giving the other Parties
notice in the manner herein set forth.

        Section 9.08 Governing Law. This Agreement shall be governed by and
construed in accordance with the domestic laws of the State of Texas without
giving effect to any choice or conflict of law provision or rule (whether of the
State of Texas or any other jurisdiction) that would cause the application of
the laws of any jurisdiction other than the State of Texas.

        Section 9.09 Amendments and Waivers. No amendment of any provision of
this Agreement shall be valid unless the same shall be in writing and signed by
Zydeco and DataVon. No waiver by any Party of any default, misrepresentation, or
breach of warranty or covenant hereunder, whether intentional or not, shall be
deemed to extend to any prior or subsequent default, misrepresentation, or
breach of warranty or covenant hereunder or affect in any way any rights arising
by virtue of any prior or subsequent such occurrence.

        Section 9.10 Severability. Any term or provision of this Agreement that
is invalid or unenforceable in any situation in any jurisdiction shall not
affect the validity or enforceability of the remaining terms and provisions
hereof or the validity or enforceability of the offending term or provision in
any other situation or in any other jurisdiction.

        Section 9.11 Expenses. Each of the Parties will bear his, her or its own
costs and expenses (including legal fees and expenses) incurred in connection
with this Agreement and the transactions contemplated hereby.

        Section 9.12 Construction. The Parties have participated jointly in the
negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the Parties and no presumption or burden of proof shall
arise favoring or disfavoring any Party by virtue of the authorship of any of
the provisions of this Agreement. Any reference to any federal, state, local, or
foreign statute or law shall be deemed also to refer to all rules and
regulations promulgated thereunder, unless the context requires otherwise. The
word "including" shall mean including without limitation.

        Section 9.13 Incorporation of Exhibits and Schedules. The Exhibits,
Annexes, and Schedules identified in this Agreement are incorporated herein by
reference and made a part hereof.

        Section 9.14 Specific Performance. Each of the Parties acknowledges and
agrees that the other Parties would be damaged irreparably in the event any of
the provisions of this Agreement are not performed in accordance with their
specific terms or otherwise are breached. Accordingly, each of the Parties
agrees that the other Parties shall be entitled to an injunction or injunctions
to prevent breaches of the provisions of this Agreement and to enforce
specifically this Agreement and the terms and provisions hereof in any action
instituted in any court of the United States or any state thereof having
jurisdiction over the Parties and the matter (subject to the provisions set
forth in Section 9.15 below), in addition to any other remedy to which they may
be entitled, at law or in equity.

        Section 9.15 Submission to Jurisdiction. Each of the Parties submits to
the jurisdiction of any state or federal court sitting in Dallas County, Texas,
in any action or proceeding arising out of or relating to this Agreement and
agrees that all claims in respect of the action or proceeding may be heard and
determined in any such court. Each Party also agrees not to bring any action or
proceeding arising out of or relating to this Agreement in any other court. Each
of the Parties waives any defense of inconvenient forum to the maintenance of
any action or proceeding so brought and waives any bond, surety, or other
security that might be required of any other Party with respect thereto. Any
Party may make service on any other Party by sending or delivering a copy of the
process to the Party to be served at the address and in the manner provided for
the giving of notices in Section 9.07 above. Nothing in this Section 9.15,
however, shall affect the right of any Party to bring any action or proceeding
arising out of or

                                       35
<PAGE>

relating to this Agreement in any other court or to serve legal process in any
other manner permitted by law or at equity. Each Party agrees that a final
judgment in any action or proceeding so brought shall be conclusive and may be
enforced by suit on the judgment or in any other manner provided by law or at
equity.

        Section 9.16 Survival. The representations and warranties of the parties
contained in this Agreement shall not survive the Effective Time. The covenants
and agreements of the parties to be performed after the Effective Time contained
in this Agreement shall survive the Effective Time.

                                ***

                                       36
<PAGE>

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

ZYDECO ENERGY, INC.,
a Delaware corporation

By: /s/ Sam B. Myers, Jr.
    -------------------------------
Name:  Sam B. Myers, Jr.

Title: Chief Executive Officer

DATAVON INC.,
a Texas corporation

By: /s/ Hugh D. Simpson
    -------------------------------
Name:  Hugh D. Simpson

Title: President and Chief Executive Officer

DVN ACQUISITION CORPORATION,
a Texas corporation

By: /s/ Sam B. Myers, Jr.
    -------------------------------
Name:  Sam B. Myers, Jr.

Title: President

                                       37
<PAGE>

                                   EXHIBIT A

                              ARTICLES OF MERGER
                                    MERGING
                          DVN ACQUISITION CORPORATION
                                 WITH AND INTO
                                 DATAVON INC.

Pursuant to Article 5.04 of the Texas Business Corporation Act ("TBCA"), these
Articles of Merger are hereby adopted by DVN Acquisition Corporation, a Texas
corporation ("Merger Sub"), and DataVoN Inc., a Texas corporation ("DataVoN"),
for the purpose of merging Merger Sub with and into DataVoN (the "Merger").
Merger Sub and DataVoN are each a "Constituent Corporation" and collectively,
the "Constituent Corporations."

1.   The name of each Constituent Corporation, the type of such Constituent
Corporation and the laws under which such Constituent Corporation was organized
and governed are:

<TABLE>
<CAPTION>
<S>                                                    <C>                                       <C>
   Name of Corporation or Other Entity                  Type of Entity                            State
   -----------------------------------                  --------------                            -----
       DVN Acquisition Corporation                       Corporation                              Texas
               DataVoN Inc.                              Corporation                              Texas
</TABLE>

2.   An Agreement and Plan of Merger (the "Plan") providing for the merger of
Merger Sub with and into DataVoN has been approved and adopted by the unanimous
consent of both the board of directors and shareholders of each Constituent
Corporation in accordance with the provisions of Article 5.03 of the TBCA, and
the Plan, its approval, and the performance of its terms were duly authorized by
all action required by the laws under which each Constituent Corporation was
incorporated and by its constituent documents.

3.   The name of the surviving corporation is DataVoN Inc. (the "Surviving
Corporation").  The Surviving Corporation will be governed by the laws of the
State of Texas.

4.   As to each Constituent Corporation, the approval of whose shareholder(s) is
required, the number of outstanding shares of each class or series of stock of
such Constituent Corporation entitled to vote, with other shares or as a class,
on the Plan are as follows:

<TABLE>
<CAPTION>
                                                                                                       Number of Shares
                                                      Number of Shares      Designation of Class    Entitled to Vote as a
       Name of Corporation              State            Outstanding              or Series            Class or Series
       -------------------              -----            -----------              ---------            ---------------
<S>                                 <C>             <C>                     <C>                     <C>
DVN Acquisition Corporation             Texas                   100                Common                    None
     DataVoN Inc.                       Texas             1,000,000                Common                    None
</TABLE>

5.   As to each Constituent Corporation, the approval of whose shareholder(s) is
required, the number of shares, not entitled to vote only as a class, voted for
and against the Plan, respectively, are as follows:

<TABLE>
<CAPTION>
                                                                                                     Designation of Class
      Name of Corporation             State          Total Voted For        Total Voted Against           or Series
      -------------------             -----          --------------         -------------------           ---------
<S>                               <C>             <C>                      <C>                      <C>
DVN Acquisition Corporation           Texas               ______                                0           Common
      DataVoN Inc.                    Texas               ______                                0           Common
</TABLE>

                                       1
<PAGE>

6.   The Articles of Incorporation of DataVoN that has been filed with the
Secretary of State of the State of Texas shall continue to be the Articles of
Incorporation of the Surviving Corporation until further amended and changed in
accordance with the provisions of the TBCA.

7.   No amendments to the Articles of Incorporation of the Surviving Corporation
are to be effected by the Merger.

8.   That the executed Plan is on file at the principal place of business of the
Surviving Corporation located at 635 West Campbell Road, Suite 130, Richardson,
Texas 75080. That a copy of the Plan will be furnished by the Surviving
Corporation, on written request and without cost, to any shareholder of each
Constituent Corporation and to any creditor or obligee of the parties to the
Merger at the time of the Merger if such obligation is then outstanding.

                                       2
<PAGE>

These Articles of Merger have been executed by the undersigned as of the _____
day of May, 2000.

                              DVN ACQUISITION CORPORATION,
                              a Texas corporation

                              By:
                                 ---------------------------------
                                    Sam B. Myers, Jr., President

                              DATAVON INC.,
                              a Texas corporation

                              By:
                                 ---------------------------------
                                    Hugh Simpson, President

                                       3
<PAGE>

        Before me, on this ___ day of May, 2000, appeared Sam B. Myers, Jr.,
President of DVN Acquisition Corporation, a Texas corporation, who acknowledged
that the foregoing instrument is the act and deed of that corporation and that
the facts stated therein are true.

                                   ---------------------------------
                                              (Print Name)

                                   Notary Public in and for

My Commission Expires:             ------------------------

(Notarial Seal)

        Before me, on this ____ day of May, 2000, appeared Hugh Simpson,
President of DataVoN Inc., a Texas corporation, who acknowledged that the
foregoing instrument is the act and deed of that corporation and that the facts
stated therein are true.

                                   ---------------------------------
                                              (Print Name)

                                   Notary Public in and for

My Commission Expires:             ------------------------

(Notarial Seal)

                                       4
<PAGE>

                                                                       EXHIBIT B

                      [Hein & Associates LLP Letterhead]

                                 May __, 2000

DataVoN Inc.
635 West Campbell Road, Suite 130
Richardson, Texas 75080

Zydeco Exploration, Inc.
700 North Pearl Street, Suite 2170
Dallas, Texas 75201

Ladies and Gentlemen:

        You have requested our opinion regarding certain federal income tax
consequences of the merger (the "Merger") of DVN Acquisition Corporation, a
Texas corporation ("Merger Subsidiary") and a wholly-owned subsidiary of Zydeco
Energy, Inc., a Delaware corporation ("Zydeco"), with and into DataVoN Inc., a
Texas corporation ("DataVoN").

        In formulating our opinion, we examined such documents as we deemed
appropriate, including the Agreement and Plan of Merger dated May __, 2000, by
and among Zydeco, Merger Subsidiary and DataVoN (the "Merger Agreement").  In
addition, we have obtained such additional information as we have deemed
relevant and necessary through consultation with various officers and
representatives of Zydeco, Merger Subsidiary and DataVoN.

        Our opinion set forth below assumes (1) the accuracy of the statements
and facts concerning the Merger set forth in the Merger Agreement, (2) that the
Merger is consummated in the manner contemplated by, and in accordance with the
terms set forth in, the Merger Agreement, and (3) the accuracy of (i) the
representations made to us by Zydeco and Merger Subsidiary, which are set forth
in the Certificate delivered to us by Zydeco and Merger Subsidiary, dated the
date hereof, and (ii) the representations made to us by DataVoN, which are set
forth in the Certificate delivered to us by DataVoN, dated the date hereof.

        Based upon the facts and statements set forth above, our examination
and review of the documents referred to above and subject to the assumptions set
forth above, we are of the opinion that for federal income tax purposes:

        1. The merger of Merger Subsidiary into DataVoN in accordance with the
           terms of the Merger Agreement constitutes a reorganization within the
           meaning of section 368(a)(2)(E) of the Internal Revenue Code of 1986,
           as amended (the "Code").

        2. No gain or loss will be recognized by DataVoN stockholders on the
           receipt, pursuant to the Merger, of Zydeco common stock and Zydeco
           preferred stock (and the Zydeco common stock, upon conversion of the
           Zydeco preferred stock) in exchange for their DataVoN common stock.

        3. DataVoN stockholders will have an aggregate basis for the Zydeco
           common stock and Zydeco preferred stock received in the Merger equal
           to the aggregate basis for the DataVoN common stock surrendered in
           exchange therefor.

                                       5
<PAGE>

        4. DataVoN stockholders will include the holding period for DataVoN
           common stock surrendered in the Merger in their holding period for
           the Zydeco common stock and Zydeco preferred stock received in the
           Merger, provided that the DataVoN shares surrendered were a capital
           asset in the hands of such holders within the meaning of section 1221
           of the Code.

        5. DataVoN will not recognize any gain or loss as a result of the
           Merger.

We express no opinion concerning any tax consequences of the Merger other than
those specifically set forth herein.

        Our opinion is based on current provisions of the Code, the Treasury
Regulations promulgated thereunder, published pronouncements of the Internal
Revenue Service and case law, any of which may be changed at any time with
retroactive effect.  Any change in the applicable laws or facts and
circumstances surrounding the Merger or any inaccuracy in the statements, facts,
assumptions and representations on which we have relied, may affect the
continuing validity of the opinions set forth herein.  We assume no
responsibility to inform you of any such change or inaccuracy that may occur or
come to our attention.

        This opinion is rendered solely for your benefit in connection with the
Merger.  This opinion may not be used or relied upon by any other person and may
not be disclosed, quoted, filed with a governmental agency or otherwise referred
to without our prior written consent.

                                            Very truly yours,

                                            HEIN & ASSOCIATES LLP

                                       6
<PAGE>

                                                                       EXHIBIT C

                         [Andrews & Kurth Letterhead]

                                 May __, 2000

DataVoN Inc.
635 West Campbell Road, Suite 130
Richardson, Texas 75080

Gentlemen:

     We have acted as counsel to Zydeco Energy, Inc., a Delaware corporation
(the "Company"), in connection with the preparation, authorization, execution
and delivery of, and the consummation of the transactions contemplated by the
Agreement and Plan of Merger dated as of May __, 2000, by and among the Company,
DVN Acquisition Corporation, a Texas corporation which is a wholly owned
subsidiary of the Company ("Merger Subsidiary"), and DataVoN Inc., a Texas
corporation ("DataVoN") (as amended from time to time, the "Merger Agreement").
Pursuant to the Merger Agreement, Merger Subsidiary shall be merged with and
into DataVoN and the separate corporate existence of Merger Subsidiary shall
thereupon cease.  Shares of the Company's company stock, par value $.001 per
share (the "Common Stock"), and the Company's preferred stock, par value $.001
per share (the "Preferred Stock"), will be issued and exchanged for shares of
common stock of DataVoN, no par value (the "DataVon Shares"), in connection with
the Merger (as defined below) contemplated by the Merger Agreement.  The
Preferred Stock will have voting rights and be convertible into Common Stock
(the "Common Conversion Shares").  The acquisition contemplated by the Merger
Agreement is hereinafter referred to as the "Merger."  Capitalized terms defined
in the Merger Agreement and used but not otherwise defined herein are used
herein as so defined.

     In so acting, we have examined originals or copies, certified or otherwise
identified to our satisfaction, of the Merger Agreement, and such corporate
records, agreements, documents and other instruments, and such certificates or
comparable documents of public officials and of officers and representatives of
the Company, and have made such inquiries of such officers and representatives
as we have deemed relevant and necessary as a basis for the opinions hereinafter
set forth.

     In such examination, we have assumed the genuineness of all signatures, the
legal capacity of natural persons, the authenticity of all documents submitted
to us as originals, the conformity to original documents of all documents
submitted to us as certified or photostatic copies and the authenticity of the
originals of such latter documents.  As to all questions of fact material to
this opinion that have not been independently established, we have relied upon
certificates or comparable documents of officers and representatives of the
Company and upon the representations and warranties of the Company contained in
the Merger Agreement.  As used herein "to our knowledge" means the conscious
awareness of facts or other information by any lawyer in our firm actively
involved in the transactions contemplated by the Merger Agreement.  We have
assumed the validity and binding effect of the Merger Agreement including the
choice of law provisions under the law of the State of Texas.

     Based on the foregoing, and subject to the qualifications stated herein, we
are of the opinion that:

     1.  The Company and its Subsidiaries are corporations duly organized,
validly existing and in good standing under the laws of the State of Delaware
and have all requisite corporate power and authority to own, lease and operate
its properties and to carry on their business as now being conducted.

                                       7
<PAGE>

     2.  The Company and Merger Subsidiary have all requisite corporate power
and authority to execute and deliver the Merger Agreement and to perform their
obligations thereunder.  The execution, delivery and performance of the Merger
Agreement by the Company and Merger Subsidiary and the consummation by the
Company and Merger Subsidiary of the transactions contemplated by the Merger
Agreement have been duly authorized by all necessary corporate action.  The
Merger Agreement has been duly and validly executed and delivered by the Company
and Merger Subsidiary.

     3.  The execution and delivery of the Merger Agreement, the consummation of
the Merger and other transactions contemplated thereby and compliance by the
Company with any of the provisions thereof will not conflict with, constitute a
default under or violate (i) any of the terms, conditions or provisions of the
certificate of incorporation or by-laws of the Company and its Subsidiaries,
(ii) any of the terms, conditions or provisions of any document, agreement or
other instrument to which the Company or its Subsidiaries are a party or by
which they are bound of which we are aware, (iii) any Texas law, Delaware
corporate or federal law or regulation (other than federal and state securities
or blue sky laws, as to which we express no opinion), or (iv) any judgment,
writ, injunction, decree, order or ruling of any court or governmental authority
binding on the Company or its Subsidiaries of which we are aware.

     4.  The Common Stock is duly authorized.  Upon the issuance and delivery of
the Common Stock to the registered holders of DataVon Shares in exchange for
DataVon Shares, in accordance with the terms of the Merger Agreement, the Common
Stock will be validly issued, fully paid and non-assessable.

     5.  The Preferred Stock is duly authorized.  Upon the issuance and delivery
of the Preferred Stock to the registered holders of DataVon Shares in exchange
for shares of DataVon Shares, in accordance with the terms of the Merger
Agreement, the Preferred Stock will be validly issued, fully paid and non-
assessable.

     6.  Upon stockholder approval of an increase in the authorized shares of
the Common Stock, the Common Conversion Shares will be duly authorized.  Upon
the issuance of the Preferred Stock pursuant to the Merger Agreement, and upon
the issuance and delivery of the Common Conversion Shares to the registered
holders of the Preferred Stock in exchange for the Preferred Stock, in
accordance with the terms of the Merger Agreement and the terms of the Preferred
Stock, the Common Conversion Shares will be validly issued, fully paid and non-
assessable.

     7.  Shares of the Common Stock which may be issued from time to time upon
the exercise of outstanding options ("Options") and warrants ("Warrants") of
Zydeco ("Option/Warrant Shares") are duly authorized.  Upon the issuance and
delivery of the Option/Warrant Shares to the registered holders of the Zydeco
Options and Warrants, in accordance with the terms of the applicable Zydeco
Option agreements and Zydeco Warrant agreements, the Option/Warrant Shares will
be validly issued, fully paid and non-assessable.

     8.  No consent, approval, waiver, license or authorization or other action
by or filing with any Delaware corporate, Texas state or federal governmental
authority is required in connection with the execution and delivery by the
Company and Merger Subsidiary of the Merger Agreement or the consummation by the
Company of the transactions contemplated thereby, except for (i) the filing with
the Secretary of State of the State of Texas of the Articles of Merger, (ii) the
filing of the Certificate of Designations with the State of Delaware, and (iii)
those already obtained.  All filings have been made with the Texas Secretary of
State to cause the Merger to be effectuated under the Texas Business Corporation
Act.

     The opinions expressed herein are limited to the laws of the State of
Texas, the corporate laws of the State of Delaware and the federal laws of the
United States, and we express no opinion as to the effect on the matters covered
by this letter of the laws of any other jurisdiction.

     The opinions expressed herein are rendered solely for your benefit in
connection with the transactions described herein.  Those opinions may not be
used or relied upon by any other person, nor may this letter or any copies
thereof be furnished to a third party, filed with a governmental agency, quoted,
cited or otherwise referred to without our prior written consent.

                                       8
<PAGE>

                                       Very truly yours,

                                       ANDREWS & KURTH

                                       9
<PAGE>

                                   EXHIBIT D

                          CERTIFICATE OF DESIGNATIONS

                                      OF

                   POWERS, RIGHTS, PREFERENCES, PRIVILEGES,

                 QUALIFICATIONS, LIMITATIONS AND RESTRICTIONS

                    OF SERIES A CONVERTIBLE PREFERRED STOCK

                                      OF

                             ZYDECO ENERGY, INC.,

                            A Delaware corporation

     Sam B. Myers certifies that:

     A.  He is the duly elected and acting President and Corporate Secretary of
Zydeco Energy, Inc., a Delaware corporation (the "CORPORATION").

     B.  The Certificate of Incorporation authorizes the directors to adopt
resolutions fixing the rights, preferences, restrictions and other matters of
wholly unissued series of Preferred Stock, and pursuant to this authority given
by the Corporation's Certificate of Incorporation, the Board of Directors of the
Corporation has duly adopted the following recitals and resolutions:

          WHEREAS, the Certificate of Incorporation of the Corporation provides
          for the Preferred Stock, consisting of 1,000,000 shares issuable from
          time to time in one or more series;

          WHEREAS, the Board of Directors of the Corporation is authorized to
          fix by resolution or resolutions the classes or series of Preferred
          Stock to have such designations and powers, rights, preferences,
          privileges, qualifications, limitations and restrictions granted to or
          imposed upon the Preferred Stock or any class or series thereof;

          WHEREAS, the Corporation has no issued or outstanding shares of
          Preferred Stock; and

          WHEREAS, the Board of Directors desires, pursuant to its authority as
          aforesaid, to designate 7,190 shares of the Preferred Stock as "SERIES
          A CONVERTIBLE SENIOR PREFERRED STOCK" and to fix the powers, rights,
          preferences, privileges, qualifications, limitations and restrictions
          relating to such series of Preferred Stock.

          RESOLVED, that the Board of Directors hereby fixes the designation and
          the number of shares constituting, and the powers, rights,
          preferences, privileges, qualifications, limitations and restrictions
          relating to, the Series A Convertible Preferred Stock as follows:

                                      10
<PAGE>

1.  DESIGNATION.  This series of Preferred Stock shall be designated "Series A
Convertible Preferred Stock" (the "SERIES A PREFERRED STOCK").

2.  NUMBER OF SHARES AND PAR VALUE.  The number of shares constituting the
Series A Preferred Stock shall be equal to 7,190.  Each share of the Series A
Preferred Stock shall have a par value of $.001.

3.  RELATIVE SENIORITY.  The Series A Preferred Stock shall, in respect of the
right to participate in distributions or payments in the event of any
liquidation, dissolution or winding up of the Corporation, rank (a) pari passu
with the Common Stock (as defined below) of the Corporation and with any other
class or series of stock of the Corporation, the terms of which specifically
provide that such class or series shall rank pari passu with the Series A
Preferred Stock in respect of the right to participate in distributions or
payments in the event of any liquidation, dissolution or winding up of the
Corporation; and (b) junior to any other class or series of stock of the
Corporation, the terms of which specifically provide that such class or series
shall rank senior to the Series A Preferred Stock in respect of the right to
participate in distributions or payments in the event of any liquidation,
dissolution or winding up of the Corporation.  The term "COMMON STOCK" shall
mean all shares now or hereafter authorized of any class of common stock of the
Corporation.

4.  NO LIQUIDATION PREFERENCE. In the event of any voluntary or involuntary
liquidation, dissolution, or winding-up of the Corporation, after distribution
in full of the preferential amounts, if any, to be distributed to the holders of
shares of any series of Preferred Stock, having a priority on liquidation
superior to that of the Series A Preferred Stock, the holders of shares of
Series A Preferred Stock shall be entitled to participate with the Common Stock
in all of the remaining assets of the Corporation available for distribution to
its stockholders, ratably with the holders of Common Stock in proportion to the
number of shares of Common Stock held by them, assuming for each holder of
Series A Preferred Stock on the record date for such distribution that each
holder was the holder of record of the number (including any fraction) of shares
of Common Stock into which the shares of Series A Preferred Stock then held by
such holder are then convertible.  A liquidation, dissolution, or winding-up of
the Corporation, as such terms are used in this Section 4, shall not be deemed
to be occasioned by or to include any merger of the Corporation with or into one
or more corporations or other entities, any acquisition or exchange of the
outstanding shares of one or more classes or series of the Corporation, or any
sale, lease, exchange, or other disposition of all or a part of the assets of
the Corporation.

5.  VOTING RIGHTS. Except as otherwise required by law, each share of
outstanding Series A Preferred Stock shall entitle the holder thereof to vote on
each matter submitted to a vote of the stockholders of the Corporation and to
have the number of votes equal to the number (including any fraction) of shares
of Common Stock into which such share of Series A Preferred Stock is then
convertible pursuant to the provisions hereof at the record date for the
determination of shareholders entitled to vote on such matters or, if no such
record date is established, at the date such vote is taken or any written
consent of stockholders becomes effective.  Except as otherwise required by law
or by this Certificate, the holders of shares of Common Stock and Series A
Preferred Stock shall vote together and not as separate classes.

6.  DIVIDENDS AND DISTRIBUTIONS.  If any dividend or other distribution payable
in cash, securities or other property, including a dividend payable in shares of
Common Stock, is declared on the Common Stock, each holder of shares of Series A
Preferred Stock on the record date for such dividend or distribution shall be
entitled to receive on the date of payment or distribution of such dividend or
other distribution the same cash, securities or other property which such holder
would have received on such record date if such holder was the holder of record
of the number (including any fraction) of shares of Common Stock into which the
shares of Series A Preferred Stock then held by such holder are then
convertible.  No dividend or other distribution shall be declared or paid on the
Common Stock unless an equivalent dividend or other distribution that satisfies
this Section 6 is declared or paid on the Series A Preferred Stock.

7.  CONVERSION.  The holders of the Series A Preferred Stock shall have
conversion rights as follows:

                                      11
<PAGE>

    (a) Optional Conversion. The holder of each share of Series A Preferred
Stock shall have the right (the "CONVERSION RIGHT"), at such holder's option, to
convert such share at any time, without cost, on the terms of this Section 7,
into the number of fully paid and non-assessable shares of Common Stock as
specified by the Conversion Ratio that is in effect at the time of conversion;
provided that, and only to the extent that, the Corporation has a sufficient
number of shares of authorized but unissued and unreserved Common Stock
available to issue upon conversion. The initial "CONVERSION RATIO" for the
Series A Preferred Stock is 1,000. The Conversion Ratio shall be subject to
adjustment from time to time as provided in this Section 7.

    (b) Mandatory Conversion. Upon the occurrence of an Increase in Authorized
Common Stock, each outstanding share of Series A Preferred Stock shall
automatically be converted, without cost, on the terms set forth in this Section
into the number of fully paid and non-assessable shares of Common Stock as
specified by the Conversion Ratio that is in effect at the time of conversion.
An "INCREASE IN AUTHORIZED COMMON STOCK" shall be deemed to occur upon
effectiveness of a filing in the office of the Secretary of State of Delaware of
an amendment to (or amendment and restatement of) the Certificate of
Incorporation of the Corporation that increases the number of authorized shares
of Common Stock to a sufficient number (after taking into account all shares
reserved for issuance by the Board of Directors) so as to enable the conversion
of all outstanding shares of Series A Preferred Stock into such number of fully
paid and non-assessable shares of Common Stock as specified by the Conversion
Ratio then in effect.

    (c) Mechanics of Conversion.

        (i)    Optional Conversion. A holder of any share of Series A Preferred
    Stock may exercise the Conversion Right of such share by surrendering the
    certificate therefor, duly endorsed, at the office of the Corporation or of
    any transfer agent for the Series A Preferred Stock, together with a written
    notice to the Corporation which shall state: (A) that such holder elects to
    convert the same; and (B) the number of shares of Series A Preferred Stock
    being converted. Thereupon the Corporation shall promptly issue and deliver
    to the holder of such shares a certificate or certificates for the number of
    whole shares of Common Stock to which such holder shall be entitled. In lieu
    of any fractional shares to which the holder would otherwise be entitled,
    the Corporation shall pay cash equal to such fraction multiplied by the then
    fair market value (as determined in good faith by the Board of Directors of
    the Corporation) of the Common Stock. If the certificate evidencing the
    Series A Preferred Stock being converted shall also evidence shares of
    Series A Preferred Stock not being converted, then the Corporation shall
    also deliver to the holder of such certificate a new stock certificate
    evidencing the Series A Preferred Stock not converted. The conversion of any
    shares of Series A Preferred Stock shall be deemed to have been made
    immediately prior to the close of business on the date that the shares of
    Series A Preferred Stock to be converted are surrendered to the Corporation,
    and the person or persons entitled to receive the shares of Common Stock
    issuable upon such conversion shall be treated for all purposes as the
    record holder or holders of such shares of Common Stock on such date. Any
    dividends or distributions declared but unpaid at the time of conversion
    with respect to the Series A Preferred Stock so converted, including any
    dividends declared on the Common Stock to which the Series A Preferred Stock
    is entitled pursuant to Section 6 above, shall be paid to the holder of
    Common Stock issued upon conversion of the Series A Preferred Stock upon the
    payment date therefore.

               The Corporation shall give written notice to each holder of a
        share of Series A Preferred Stock promptly upon the liquidation,
        dissolution or winding up of the Corporation, and not more than fifty
        (50) nor less than twenty (20) days before the anticipated date of
        consummation of any acquisition of the Corporation or any sale of all or
        substantially all of the assets of the Corporation and no such
        acquisition of the Corporation or sale of assets shall be effective
        until such notice shall have been given.

        (ii)   Mandatory Conversion. The Corporation shall give written notice
    to each holder of a share of Series A Preferred Stock within ten (10) days
    after the effectiveness of an Increase in Authorized Common Stock. Following
    the conversion of such shares, each holder of shares so converted may
    surrender the certificate therefor at the office of the Corporation or any
    transfer agent for the Series A Preferred Stock. Upon such surrender, the
    Corporation shall issue and deliver to each holder a certificate or

                                      12
<PAGE>

    certificates for the number of whole shares of Common Stock to which such
    holder is entitled. In lieu of any fractional shares to which the holder
    would otherwise be entitled, the Corporation shall pay cash equal to such
    fraction multiplied by the then fair market value (as determined in good
    faith by the Board of Directors of the Corporation) of the Common Stock.

               The conversion of shares of Series A Preferred Stock shall be
        effective simultaneously with the effectiveness of an Increase in
        Authorized Common Stock, whether or not the certificates representing
        such shares of Series A Preferred Stock shall have been surrendered or
        new certificates representing the shares of Common Stock into which such
        shares have been converted shall have been issued and the person or
        persons entitled to receive the shares of Common Stock issuable upon
        such conversion shall be treated for all purposes as the record holder
        or holders of such shares of Common Stock on such date. Any dividends or
        distributions declared but unpaid at the time of a mandatory conversion
        with respect to the Series A Preferred Stock so converted, including any
        dividends declared on the Common Stock to which the Series A Preferred
        Stock is entitled pursuant to Section 6 above, shall be paid on the
        payment date therefore.

        (d) Adjustment of Conversion Ratio. The Conversion Ratio for each share
of Series A Preferred Stock and the kind of securities issuable upon the
conversion of any share of Series A Preferred Stock shall be adjusted from time
to time as follows:

            (i)    Subdivision or Combination of Shares. If the Corporation at
        any time effects a subdivision or combination of the outstanding Common
        Stock, the Conversion Ratio shall be increased, in the case of a
        subdivision, or decreased, in the case of a combination, in the same
        proportions as the Common Stock is subdivided or combined, in each case
        effective automatically upon, and simultaneously with, the effectiveness
        of the subdivision or combination which gives rise to the adjustment.

            (ii)   Reclassification, Consolidation or Merger. If at any time, as
        a result of (A) a capital reorganization or reclassification (other than
        a subdivision or combination which gives rise to an adjustment of the
        Conversion Ratio pursuant to Section 7(d)(i)); or (B) a merger or
        consolidation of the Corporation with another corporation (whether or
        not the Corporation is the surviving corporation), the Common Stock
        issuable upon the conversion of the Series A Preferred Stock shall be
        changed into or exchanged for the same or a different number of shares
        of any class or classes of stock of the Corporation or any other
        corporation, or other securities convertible into such shares, then, as
        a part of such reorganization, reclassification, merger or
        consolidation, appropriate adjustments shall be made in the terms of the
        Series A Preferred Stock (or of any securities into which the Series A
        Preferred Stock is changed or for which the Series A Preferred Stock is
        exchanged), so that: (x) the holders of Series A Preferred Stock or of
        such substitute securities shall thereafter be entitled to receive, upon
        conversion of the Series A Preferred Stock or of such substitute
        securities, the kind and amount of shares of stock, other securities,
        money and property which such holders would have received at the time of
        such capital reorganization, reclassification, merger, or consolidation,
        if such holders had converted their Series A Preferred Stock immediately
        prior to such capital reorganization, reclassification, merger, or
        consolidation, and (y) the Series A Preferred Stock or such substitute
        securities shall thereafter be adjusted on terms as nearly equivalent as
        may be practicable to the adjustments theretofore provided in this
        Section 7(d). No consolidation or merger in which the Corporation is not
        the surviving corporation shall be consummated unless the surviving
        corporation shall agree, in writing, to the provisions of this Section
        7(d)(ii). The provisions of this Section 7(d)(ii) shall similarly apply
        to successive capital reorganizations, reclassifications, mergers, and
        consolidations.

            (iii)  Other Action Affecting Common Stock. If at any time the
        Corporation takes any action affecting its Common Stock which, in the
        opinion of the Board of Directors of the Corporation, would have an
        adverse effect upon the Conversion Rights of the Series A Preferred
        Stock and the foregoing conversion ratio adjustment provisions are not
        strictly applicable but the failure to make any adjustment would
        adversely affect the Conversion Rights, then the Conversion Ratio and
        the kind of securities issuable upon the conversion of Series A
        Preferred Stock shall be adjusted to preserve, without dilution, the
        Conversion

                                      13
<PAGE>

        Rights in such manner and at such time as the Board of Directors of the
        Corporation may in good faith determine to be equitable in the
        circumstances.

            (iv)   Notice of Adjustments. Whenever the Conversion Ratio or the
        kind of securities issuable upon the conversion of any one of or all of
        the Series A Preferred Stock shall be adjusted pursuant to Sections
        7(d)(i) - (iii) above, the Corporation shall make a certificate signed
        by its Chief Financial Officer, Secretary or Assistant Secretary,
        setting forth, in reasonable detail, the event requiring the adjustment,
        the amount of the adjustment, the method by which such adjustment was
        calculated (including a description of the basis on which the Board of
        Directors of the Corporation made any determination hereunder), and the
        Conversion Ratio and the kind of securities issuable upon the conversion
        of the Series A Preferred Stock after giving effect to such adjustment,
        and shall cause copies of such certificate to be mailed (by first class
        mail postage prepaid) to each holder of Series A Preferred Stock
        promptly after each adjustment.

        (e) Full Consideration. All shares of Common Stock which shall be issued
upon the conversion of any Series A Preferred Stock (which is itself fully paid
and non-assessable) will, upon issuance, be fully paid and non-assessable. The
Corporation will pay such amounts and will take such other action as may be
necessary from time to time so that all shares of Common Stock which shall be
issued upon the conversion of any Series A Preferred Stock will, upon issuance
and without cost to the recipient, be free from all pre-emptive rights, taxes,
liens and charges with respect to the issue thereof.

        (f) No Impairment. The Corporation will not, by amendment of its
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed hereunder by the Corporation but will at
all times in good faith assist in the carrying out of all the provisions of this
Section 7 and in the taking of all such action as may be necessary or
appropriate in order to protect the Conversion Rights of the holders of the
Series A Preferred Stock against impairment.

        (g) Cancellation of Series A Preferred Stock. No share of Series A
Preferred Stock acquired by the Corporation upon conversion, redemption or
purchase shall be reissued and all such shares shall be canceled, retired and
returned to the status of authorized and unissued shares of undesignated
preferred stock. The Corporation may take such appropriate corporate action to
reduce the authorized number of Series A Preferred Stock accordingly.

8.   PROTECTIVE PROVISIONS.  In addition to any other rights provided by
law, so long as at least one share of Series A Preferred Stock is outstanding,
the Corporation shall not, without first obtaining the affirmative vote or
written consent of the holders of not less than a majority of the outstanding
shares of the Series A Preferred Stock voting together as a single class:

        (a) amend or repeal any provision of the Corporation's Certificate of
Incorporation, Bylaws or this Certificate of Designations if such action would
materially and adversely alter or change the preferences, rights, privileges or
powers of, or the restrictions provided for the benefit of, the Series A
Preferred Stock;

        (b) increase or decrease (other than by conversion) the total number of
authorized shares of Series A Preferred Stock;

        (c) create or issue any series or class, reclassify any authorized
capital stock of the Corporation into stock of any series or class, increase the
authorized or issued amount of any class or series of stock, or authorize,
create, issue or reclassify any obligation or security convertible or
exchangeable into or evidencing a right to purchase capital stock of any class
or series, that ranks prior to the Series A Preferred Stock as to dividends or
rights upon liquidation, dissolution or winding up;

        (d) issue any Common Stock after the date on which Series A Preferred
Stock has been last issued and sold, whether or not subsequently reacquired or
retired by the Corporation, for a consideration per share less than fair market
value of the Common Stock (as determined in good faith by the Board of Directors
of the Corporation) at such issuance or deemed issuance other than: (1) shares
of Common Stock issued in transactions giving rise to

                                      14
<PAGE>

adjustments under Sections 7(d)(i) or (ii) above, (2) shares of Common Stock
issued upon conversion of shares of Series A Preferred Stock, or (3) shares
issued upon the conversion of Convertible Securities (as defined below) if the
issuance of such Convertible Securities did not violate Section 8(e) below;

        (e) issue any Convertible Securities with respect to which the Effective
Price is less than the fair market value of the Common Stock (as determined in
good faith by the Board of Directors of the Corporation), at such issuance or
deemed issuance. "CONVERTIBLE SECURITIES" means all rights or options for the
purchase of, or stock or other securities convertible into, Common Stock (other
than Common Stock issued for the purposes set forth in Sections 8(d)(1) or (2)
above) or other Convertible Securities, whenever and each time issued. The
"EFFECTIVE PRICE" with respect to any Convertible Securities means the result of
dividing: (1) the sum of (x) the total consideration, if any, received by the
Corporation for the issuance of such Convertible Securities, plus (y) the
minimum consideration, if any, payable to the Corporation upon exercise or
conversion of such Convertible Securities (assuming that the full amount of
securities issuable upon exercise or conversion are issued), plus (z) the
minimum consideration, if any, payable to the Corporation upon exercise or
conversion of any Convertible Securities issuable upon exercise or conversion of
such Convertible Securities, by: (2) the maximum number of Common Stock (other
than Common Stock issued for the purposes set forth in Sections 8(d)(1) or (2)
above) issuable upon exercise or conversion of such Convertible Securities or of
any Convertible Securities issuable upon exercise or conversion of such
Convertible Securities; or

        (f) sell, convey, or otherwise dispose of or encumber all or
substantially all of its property or business or merge or consolidate with any
other corporation (other than a wholly-owned subsidiary corporation) or effect
any transaction or series of related transactions in which more than fifty
percent (50%) of the voting power of the Corporation is disposed of.

9.   SEVERABILITY OF PROVISIONS. If any voting powers, preferences and relative,
participating, optional and other special rights of the Series A Preferred Stock
and qualifications, limitations and restrictions thereof set forth in this
resolution (as such resolution may be amended from time to time) is invalid,
unlawful or incapable of being enforced by reason of any rule of law or public
policy, all other voting powers, preferences and relative, participating,
optional and other special rights of Series A Preferred Stock and
qualifications, limitations and restrictions thereof set forth in this
resolution (as so amended) which can be given effect without the invalid,
unlawful or unenforceable voting powers, preferences and relative,
participating, optional and other special rights of Series A Preferred Stock and
qualifications, limitations and restrictions thereof shall, nevertheless, remain
in full force and effect, and no voting powers, preferences and relative,
participating, optional or other special rights of Series A Preferred Stock and
qualifications, limitations, and restrictions thereof herein set forth shall be
deemed dependent upon any other such voting powers, preferences and relative,
participating, optional or other special rights of Series A Preferred Stock and
qualifications, limitations and restrictions thereof unless so expressed herein.

     C.  The authorized number of shares of Preferred Stock of the Corporation
is 1,000,000 and the number of shares constituting the Series A Convertible
Preferred Stock, consisting of the shares authorized hereby, is 7,190.

                                      15
<PAGE>

     IN WITNESS WHEREOF, the undersigned have executed this certificate as of
_________ ___, 2000, on behalf of the Corporation, and certify under penalty of
perjury that this is the act and deed of the Corporation, and that the facts
stated herein are true.

                              ZYDECO ENERGY, INC.

                              By:
                                 ----------------------------------

ATTEST:

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

                                      16
<PAGE>

                                   EXHIBIT E

                    DIRECTORS AND OFFICERS OF ZYDECO AS OF
                              THE EFFECTIVE TIME

Zydeco Energy, Inc.        Hugh D. Simpson    President, Chief Executive Officer
                                              and Secretary

                           Hugh D. Simpson    Chairman of the Board and Sole
                                              Director

Zydeco Exploration, Inc.   Hugh D. Simpson    President, Chief Executive Officer
                                              and Secretary

                           Hugh D. Simpson    Chairman of the Board and
                                              Director

                           Sam B. Myers, Jr.  Director

                           Phillip A. Tuttle  Director

Wavefield Image, Inc.      Hugh D. Simpson    President, Chief Executive Officer
                                              and Secretary

                           Hugh D. Simpson    Chairman of the Board and Sole
                                              Director

                                       1

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