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                       $5,000,000.00 REVOLVING CREDIT AGREEMENT

                                       BETWEEN

                               IWL COMMUNICATIONS, INC.

                                         AND

                                BANK ONE, TEXAS, N.A.




                                    AUGUST 1, 1997




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                                  TABLE OF CONTENTS

ARTICLE I    TERMS DEFINED . . . . . . . . . . . . . . . . . . . . . . . . .  1
     SECTION 1.1.  DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . .  1
     SECTION 1.2.  ACCOUNTING TERMS AND DETERMINATIONS . . . . . . . . . . . 16
     SECTION 1.3.  GENDER AND NUMBER . . . . . . . . . . . . . . . . . . . . 17
     SECTION 1.4.  REFERENCES TO CREDIT AGREEMENT. . . . . . . . . . . . . . 17

ARTICLE II   TOTAL REVOLVING COMMITMENT. . . . . . . . . . . . . . . . . . . 17
     SECTION 2.1.  COMMITMENT. . . . . . . . . . . . . . . . . . . . . . . . 17
     SECTION 2.2.  METHOD OF BORROWING . . . . . . . . . . . . . . . . . . . 17
     SECTION 2.3.  INTEREST RATE . . . . . . . . . . . . . . . . . . . . . . 18
     SECTION 2.3.  REVOLVING NOTE. . . . . . . . . . . . . . . . . . . . . . 21
     SECTION 2.4.  TERMINATION OF TOTAL REVOLVING COMMITMENT . . . . . . . . 21
     SECTION 2.5.  INTEREST RATE . . . . . . . . . . . . . . . . . . . . . . 21
     SECTION 2.6.  USAGE FEE . . . . . . . . . . . . . . . . . . . . . . . . 21

ARTICLE III  GENERAL PROVISIONS RELATED TO LOAN PAYMENTS; FEES . . . . . . . 22
     SECTION 3.1.  GENERAL PROVISIONS AS TO PAYMENTS . . . . . . . . . . . . 22
     SECTION 3.2.  OVERDUE PRINCIPAL AND INTEREST. . . . . . . . . . . . . . 22
     SECTION 3.3.  MAXIMUM LAWFUL RATE . . . . . . . . . . . . . . . . . . . 22
     SECTION 3.4.  INCREASED COSTS AND LEGAL RESTRICTIONS APPLICABLE
                   TO TOTAL REVOLVING COMMITMENT . . . . . . . . . . . . . . 23

ARTICLE IV   COLLATERAL FOR THE TOTAL REVOLVING COMMITMENT . . . . . . . . . 25
     SECTION 4.1.  SECURITY. . . . . . . . . . . . . . . . . . . . . . . . . 25
     SECTION 4.2.  DOCUMENTATION . . . . . . . . . . . . . . . . . . . . . . 25

ARTICLE V    CONDITIONS PRECEDENT TO ADVANCES. . . . . . . . . . . . . . . . 26
     SECTION 5.1.  ALL ADVANCES. . . . . . . . . . . . . . . . . . . . . . . 26
     SECTION 5.2.  CLOSING DATE. . . . . . . . . . . . . . . . . . . . . . . 27

ARTICLE VI   REPRESENTATIONS AND WARRANTIES. . . . . . . . . . . . . . . . . 27
     SECTION 6.1.  USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . 28
     SECTION 6.2.  CORPORATE EXISTENCE AND POWER . . . . . . . . . . . . . . 28
     SECTION 6.3.  CORPORATE AND GOVERNMENTAL AUTHORIZATION; 
                   CONTRAVENTION . . . . . . . . . . . . . . . . . . . . . . 28
     SECTION 6.4.  BINDING EFFECT. . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 6.5.  FINANCIAL INFORMATION . . . . . . . . . . . . . . . . . . 29
     SECTION 6.6.  LITIGATION. . . . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 6.7.  TAXES AND FILING OF TAX RETURNS . . . . . . . . . . . . . 29
     SECTION 6.8.  BUSINESS; COMPLIANCE. . . . . . . . . . . . . . . . . . . 30
     SECTION 6.9.  LICENSES, PERMITS, ETC. . . . . . . . . . . . . . . . . . 30
     SECTION 6.10. COMPLIANCE WITH LAW . . . . . . . . . . . . . . . . . . . 30

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     SECTION 6.11. FULL DISCLOSURE . . . . . . . . . . . . . . . . . . . . . 30
     SECTION 6.12. FISCAL YEAR . . . . . . . . . . . . . . . . . . . . . . . 30
     SECTION 6.13. ENVIRONMENTAL MATTERS . . . . . . . . . . . . . . . . . . 30
     SECTION 6.14. SUBSIDIARIES. . . . . . . . . . . . . . . . . . . . . . . 31
     SECTION 6.15. ERISA . . . . . . . . . . . . . . . . . . . . . . . . . . 31

ARTICLE VII  COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 7.1.  INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 7.2.  FINANCIAL COVENANTS . . . . . . . . . . . . . . . . . . . 33
     SECTION 7.3.  CONSOLIDATIONS, MERGERS, SALES OF ASSETS, 
                   AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . 34
     SECTION 7.4.  USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . 34
     SECTION 7.5.  RIGHT OF INSPECTION; RIGHT OF AUDIT . . . . . . . . . . . 34
     SECTION 7.6.  LIMITATION ON DEBT. . . . . . . . . . . . . . . . . . . . 34
     SECTION 7.7.  LIMITATION ON SALE OF PROPERTIES. . . . . . . . . . . . . 35
     SECTION 7.8.  LIMITATIONS ON LIENS. . . . . . . . . . . . . . . . . . . 35
     SECTION 7.9.  MAINTENANCE OF INSURANCE. . . . . . . . . . . . . . . . . 35
     SECTION 7.10. PAYMENT OF TAXES AND CLAIMS . . . . . . . . . . . . . . . 35
     SECTION 7.11. COMPLIANCE WITH LAWS AND DOCUMENTS. . . . . . . . . . . . 36
     SECTION 7.12. ENVIRONMENTAL LAW COMPLIANCE AND INDEMNITY. . . . . . . . 36
     SECTION 7.13. ADDITIONAL DOCUMENTS. . . . . . . . . . . . . . . . . . . 38
     SECTION 7.14. QUANTITY OF DOCUMENTS . . . . . . . . . . . . . . . . . . 38
     SECTION 7.15. INVESTMENTS . . . . . . . . . . . . . . . . . . . . . . . 38
     SECTION 7.16. TRANSACTIONS WITH AFFILIATES. . . . . . . . . . . . . . . 38
     SECTION 7.17. FISCAL YEAR . . . . . . . . . . . . . . . . . . . . . . . 38
     SECTION 7.18. ERISA . . . . . . . . . . . . . . . . . . . . . . . . . . 38
     SECTION 7.19. CHANGES IN MANAGEMENT . . . . . . . . . . . . . . . . . . 39
     SECTION 7.20. REPURCHASE OF STOCK . . . . . . . . . . . . . . . . . . . 39
     SECTION 7.21. ADDITIONAL SUBSIDIARIES . . . . . . . . . . . . . . . . . 39

ARTICLE VIII DEFAULTS AND REMEDIES . . . . . . . . . . . . . . . . . . . . . 40
     SECTION 8.1.  EVENTS OF DEFAULT . . . . . . . . . . . . . . . . . . . . 40

ARTICLE IX   MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . 42
     SECTION 9.1.  NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . 42
     SECTION 9.2.  NO WAIVERS. . . . . . . . . . . . . . . . . . . . . . . . 43
     SECTION 9.3.  EXPENSES; INDEMNIFICATION . . . . . . . . . . . . . . . . 43
     SECTION 9.4.  RIGHT OF SET-OFF. . . . . . . . . . . . . . . . . . . . . 44
     SECTION 9.5.  AMENDMENTS AND WAIVERS. . . . . . . . . . . . . . . . . . 44
     SECTION 9.6.  SURVIVAL. . . . . . . . . . . . . . . . . . . . . . . . . 45
     SECTION 9.7.  LIMITATION ON INTEREST. . . . . . . . . . . . . . . . . . 45
     SECTION 9.8.  INVALID PROVISIONS. . . . . . . . . . . . . . . . . . . . 45
     SECTION 9.9.  CONFLICT OF TERMS . . . . . . . . . . . . . . . . . . . . 46
     SECTION 9.10. REVOLVING LOAN. . . . . . . . . . . . . . . . . . . . . . 46

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     SECTION 9.11. SUCCESSORS AND ASSIGNS. . . . . . . . . . . . . . . . . . 46
     SECTION 9.12. TEXAS LAW . . . . . . . . . . . . . . . . . . . . . . . . 46
     SECTION 9.13. COUNTERPARTS; EFFECTIVENESS . . . . . . . . . . . . . . . 47
     SECTION 9.14. NO THIRD PARTY BENEFICIARIES. . . . . . . . . . . . . . . 47
     SECTION 9.15. ENTIRE AGREEMENT. . . . . . . . . . . . . . . . . . . . . 47

                                SCHEDULES AND EXHIBITS

    SCHEDULE I   - Debt of Borrower
    SCHEDULE II  - Liens of Borrower
    SCHEDULE III - Subsidiaries of Borrower

    EXHIBIT A - Form of Request for Advance
    EXHIBIT B - Form of Borrowing Base Certificate
    EXHIBIT C - Form of Compliance Certificate

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                              REVOLVING CREDIT AGREEMENT


     THIS REVOLVING CREDIT AGREEMENT (this "CREDIT AGREEMENT") is entered into
as of the 1st day of August, 1997, between IWL COMMUNICATIONS, INC., a Texas
corporation ("BORROWER"), and BANK ONE, TEXAS, N.A., a national banking
association ("LENDER").

                                 W I T N E S S E T H:

     WHEREAS, Borrower has requested that Lender make a revolving credit loan to
Borrower in an amount not to exceed $5,000,000.00 which shall be used for
working capital purposes and for other general corporate purposes; and

     WHEREAS, Lender has agreed to such request on the terms and conditions
herein contained.

     NOW, THEREFORE, in consideration of the mutual covenants herein contained,
and for other valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:


                                      ARTICLE I

                                    TERMS DEFINED

     SECTION 1.1.   DEFINITIONS.  The following terms, as used herein, have the
following meanings:

     "Account" means any and all "Accounts" as that term is defined in the
Security Agreement.

     "Accounts Receivable Report" has the meaning set forth in SECTION 6.1(D).

     "Adjusted LIBOR Rate" shall mean on the applicable Effective Date, with
respect to a LIBOR Rate Portion, a rate per annum equal to the SUM OF (a) the
quotient of (i) the LIBOR Rate on the applicable Effective Date, divided by
(ii) the remainder of 1.00 minus the LIBOR Reserve Requirement, if any, on the
applicable 


REVOLVING CREDIT AGREEMENT             1

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Effective Date, plus (b) the FDIC Percentage in effect on the applicable 
Effective Date, together with any additional impositions, assessments, fees 
or surcharges that may be imposed on Lender (expressed as a percentage), to 
the extent such impositions, assessments, fees or surcharges are not 
reflected in the FDIC Percentage or the LIBOR Reserve Requirement and are 
generally imposed on banks with capitalization and supervisory risk factors 
comparable to Lender, plus (c) the LIBOR Margin.

     "Advance" means each advance made by Lender under the Total Revolving
Commitment and evidenced by a Request for Advance submitted by Borrower to
Lender pursuant to the terms and conditions of this Credit Agreement.

     "Affiliate" of any corporation shall mean any Person which, directly or
indirectly, controls or is controlled by or is under common control with such
corporation and, without limiting the generality of the foregoing, shall include
any Person which beneficially owns or holds five percent (5%) or more of any
class or series of voting securities of such corporation (or in case of a Person
which is not a corporation, five percent (5%) or more of the equity interest) of
which is beneficially owned or held by such corporation.  For the purposes of
this definition, "control" (including, with correlative meanings, the terms
"controlled by" and "under common control with"), as used with respect to any
Person, shall mean the possession, directly or indirectly, of the power to
direct or cause the direction of the management and policies of such Person,
whether through the ownership of voting securities, by contract or otherwise.  

     "AGF Credit Agreement" means that certain Credit Agreement, dated August 1,
1997, by and between Borrower and Lender, pursuant to which Lender agreed,
subject to the terms and conditions therein contained, to make available to
Borrower an advised guidance facility.

     "AGF Note" means any promissory note executed by Borrower pursuant to the
AGF Credit Agreement.

     "Applicable Base Rate" means (a) prior to the Interest Reduction Date, the
Base Rate, and (b) after the Interest Reduction Date, (i) the Base Rate, minus
(ii) one-half of one percent (.50%).

REVOLVING CREDIT AGREEMENT             2

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    "Applicable Environmental Law and Laws" has the meaning set forth in 
SECTION 6.13.

     "Applicable Rate" has the meaning set forth in SECTION 2.3.

     "Assets" means all of the assets of any Person, real or personal, which are
included on a balance sheet of such Person prepared in accordance with GAAP.

     "Authorized Officer" means, as to any Person that is a corporation, any of
its Chairman, Vice-Chairman, President, Vice President(s), Chief Executive
Officer, Chief Financial Officer, Chief Accounting Officer or Treasurer, or as
to any other Person, if such Person is a partnership, the partnership's general
partner or other Person authorized by appropriate action to execute the Loan
Documents or any other documents or certificates to be executed by such Person
hereunder or in connection with any Advance.

     "Base Rate" means the base interest rate as announced or published by
Lender from time to time, and may not be the lowest interest rate charged by
Lender.

     "Base Rate Advance" shall mean an Advance or any portion of an Advance
which bears interest computed with reference to the Applicable Base Rate.

     "Base Rate Portion" shall mean that portion or portions of the Total
Revolving Commitment which bears interest computed with reference to the
Applicable Base Rate.

     "Borrower" has the meaning set forth in the first paragraph of this Credit
Agreement.

     "Borrowing Base" means an amount equal to the sum of (a) eighty percent
(80%) of the combined book value of Borrower's Eligible Accounts as shown in the
monthly Borrowing Base Certificate, plus (b) the lesser of (i) fifty percent
(50%) of the combined book value of Borrower's Eligible Inventory as shown in
the monthly Borrowing Base Certificate, or (ii) $1,000,000.

     "Borrowing Base Certificate" means a certificate, in the form 


REVOLVING CREDIT AGREEMENT             3

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attached hereto as EXHIBIT B, completed in all appropriate respects and 
executed by an Authorized Borrowing Officer.

     "Business Day" means any day except a Saturday, Sunday or other day on
which national banks in Dallas, Texas are authorized by law to close.  

     "Cash Equivalents" means (a) cash and obligations issued or guaranteed by
the United States of America, (b) obligations issued or guaranteed by any person
controlled or supervised by and acting as an agency or instrumentality of the
United States of America pursuant to authority granted by the Congress of the
United States, (c) certificates of deposit issued, or banker's acceptances drawn
on and accepted by, or money market accounts or time deposits in, commercial
banks which are members of the Federal Deposit Insurance Corporation and which
have a combined capital, surplus and undistributed profits of at least
$50,000,000, (d) repurchase agreements with any such commercial bank, or with
broker-dealers or other institutions, that are secured by obligations issued or
guaranteed by the United States of America or an agency or instrumentality
thereof, (e) other money market instruments and mutual funds, substantially all
of the assets of which are invested in any or all of the investments described
in clauses (a) through (d) above, and (f) commercial paper rated P-1 by Moody's
Investors Service, Inc. or A-1 by Standard & Poor's Corporation on the date of
acquisition. 

     "Closing Date" means the date of this Credit Agreement.

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

     "Compliance Certificate" means a certificate, in the form attached hereto
as EXHIBIT C, completed in all appropriate respects and executed by an
Authorized Borrowing Officer. 

     "Consequential Loss" has the meaning set forth in SECTION 3.5.

     "Credit Agreement" means this Credit Agreement.

     "Credit Period" means the period commencing on the date of this Credit
Agreement and ending on the Termination Date.


REVOLVING CREDIT AGREEMENT             4

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     "Current Maturities" means, with respect to any Person, on any date of
calculation, the current liabilities of such Person attributable to its long
term indebtedness, determined in accordance with GAAP.

     "Current Ratio" means, for any date of determination, the ratio of
(a) Borrower's current assets as shown on the balance sheet of Borrower prepared
in accordance with GAAP, to (b) Borrower's current liabilities as shown on the
balance sheet of Borrower prepared in accordance with GAAP.

     "Debt" means, for any Person, without duplication, (a) all obligations of
such Person for borrowed money, (b) all obligations of such Person evidenced by
bonds, debentures, notes or other similar instruments, (c) all other
indebtedness (including capitalized lease obligations) of such Person on which
interest charges are customarily paid or accrued, (d) all contingent liabilities
of such Person, (e) the unfunded or unreimbursed portion of all letters of
credit issued for the account of such Person, and (f) all liability of such
Person as a general partner or joint venturer for obligations of the nature
described in (a) through (e) preceding.

     "Debtor Relief Laws" means any applicable liquidation, conservatorship,
bankruptcy, moratorium, rearrangement, insolvency, reorganization, or similar
laws, domestic or foreign, including but not limited to those in Title 11 of the
United States Code, affecting the rights or remedies of creditors generally, as
in effect from time to time.

     "Default" means any condition or event which constitutes an Event of
Default or which with the giving of notice or lapse of time or both would,
unless cured or waived, become an Event of Default.  

     "Default Rate" has the meaning set forth in SECTION 3.2.

     "Distribution" by any Person, means (a) with respect to any stock issued by
such Person or any partnership or joint venture interest of such person, the
retirement, redemption, repurchase, or other acquisition for value of such
stock, partnership or joint venture interest, (b) the declaration or payment
(without 


REVOLVING CREDIT AGREEMENT             5

<PAGE>

duplication) of any dividend or other distribution, whether monetary or in 
kind, on or with respect to any stock, partnership or joint venture of any 
Person, and (c) any other payment or distribution of assets of a similar 
nature or in respect of an equity investment.

     "EBITDA" means, for any period, determined in accordance with GAAP for
Borrower, the sum of net income before taxes, plus depreciation, plus
amortization, plus interest expense, plus any other non-cash expenses, each as
deducted in determining such net income before taxes.

     "Effective Date" has the meaning set forth in SECTION 2.3.

     "Eligible Accounts" means, at the time of any determination thereof, each
Account as to which the following requirements have been fulfilled to the
satisfaction of Lender:

          (a)  Borrower has lawful and absolute title to such Account;

          (b)  Such Account is a valid, legally enforceable obligation of the
     Person who is obligated under such Account (the "ACCOUNT DEBTOR") for goods
     or services previously delivered or rendered to such Person by Borrower;

          (c)  There has been excluded from such Account any portion that is
     subject to any dispute, offset, counterclaim or other claim or defense on
     the part of the account debtor or to any claim on the part of the account
     debtor denying liability under such Account;

          (d)  Borrower has the full and unqualified right to assign and grant a
     security interest in such Account to Lender as security for the
     Obligations;

          (e)  Such Account is payable in dollars and is evidenced by an invoice
     rendered to the account debtor and such Account is not evidenced by any
     chattel paper, promissory note or other instrument;

          (f)  Such Account is subject to a fully perfected first 


REVOLVING CREDIT AGREEMENT             6

<PAGE>

     priority security interest in favor of Lender, pursuant to the Loan 
     Documents, prior to the rights of, and enforceable as such against, 
     any other Person (including holders of a purchase money security interest);

          (g)  Such Account is not subject to any lien in favor of any Person
     other than the lien of Lender pursuant to the Loan Documents;

          (h)  Such Account arose from a transaction in the ordinary course of
     business of Borrower;

          (i)  Such Account has not been due and payable for more than ninety
     (90) days from the invoice date;

          (j)  No account debtor in respect of such Account is (i) primarily
     conducting business in any jurisdiction located outside the United States
     of America, (ii) any foreign government, (iii) an Affiliate of Borrower,
     (iv) the subject of a proceeding under any Debtor Relief Laws, or (v) the
     United States of America or any state; 

          (k)  No account debtor in respect of such Account is an account debtor
     on other Accounts of Borrower and either (i) more than ten percent (10%) of
     all such other Accounts have been due and payable for more than ninety (90)
     days, or (ii) after including such Account as an Eligible Account, the
     aggregate of account debtor's Accounts is more than twenty-five percent
     (25%) of all Eligible Accounts; and

          (l)  Lender has not determined in good faith that there is a
     legitimate concern with respect to the timing or collection of such
     Account.

     "Eligible Inventory" means, at the time of any determination thereof, each
item of raw material or finished goods inventory as to which the following
requirements have been fulfilled to the satisfaction of Lender:

          (a)  Borrower has lawful and absolute title to such item of inventory;


REVOLVING CREDIT AGREEMENT             7

<PAGE>


          (b)  Borrower has the full and unqualified right to assign and grant a
     security interest in such item of inventory to Lender as security for the
     Obligations;

          (c)  Such item of inventory is subject to a fully perfected first
     priority security interest in favor of Lender pursuant to the Loan
     Documents, prior to the rights of, and enforceable as against, any other
     Person (including holders of a purchase money security interest); and

          (d)  Such item of inventory is not subject to any lien in favor of any
     Person other than the lien of Lender pursuant to the Loan Documents.

     The following items shall be excluded from Eligible Inventory:

          (e)  Work in process inventory or any overhead that might be allocable
     to work in process inventory;

          (f)  Any inventory in the possession of a bailee, warehouseman,
     consignee or similar third party;

          (g)  Any inventory that is damaged, defective, unmerchantable,
     outdated or obsolete;

          (h)  Any inventory subject to a title vesting clause under a contract
     with the United States of America or any department or agency thereof;

          (i)  Any inventory produced in violation of the Fair Labor Standards
     Act and subject to the so-called "hot-goods" provisions contained in Title
     25 U.S.C. 215(a)(i);

          (j)  Any merchandise sold which has been returned by the customer for
     whatever reason and is not immediately saleable for a price approximately
     equal to or greater than the original sales price of such merchandise;

          (k)  Any inventory not located in a jurisdiction in which Bank has
     filed an appropriate financing statement;

          (l)  Any inventory that is in transit for any reason; and


REVOLVING CREDIT AGREEMENT             8

<PAGE>


          (m)  Any inventory reasonably rejected by Lender as unsuitable.

     "Employee Plan" means at any time an employee benefit plan as defined in
Section 3(3) of ERISA that is now or was previously maintained, sponsored or
contributed to by Borrower.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, together with all regulations issued pursuant
thereto.

     "Event of Default" has the meaning set forth in SECTION 8.1.

     "FDIC Percentage" shall mean, on any day, the net assessment rate
(expressed as a percentage rounded to the next highest 1/100 of 1%), if any,
which is in effect on such day (under the regulations of the Federal Deposit
Insurance Corporation or any successor) for determining the assessments paid by
Lender to the Federal Deposit Insurance Corporation (or any successor) for
insuring Eurocurrency deposits made in dollars at Lender's principal offices. 
Each determination of said percentage made by Lender shall, in the absence of
manifest error, be binding and conclusive.

     "Federal Funds Rate" means, for any day, the rate per annum (rounded
upwards if necessary, to the nearest 1/100th of 1%) equal to the weighted
average of the rates on overnight Federal funds transactions with members of the
Federal Reserve System arranged by Federal funds brokers on such day, as
published by the Federal Reserve Bank of New York on the Business Day next
succeeding such day, provided that (a) if such day is not a Business Day, the
Federal Funds Rate for such day shall be such rate on such transactions on the
next preceding Business Day as so published on the next succeeding Business Day,
and (b) if no such rate is so published on such next succeeding Business Day,
the Federal Funds Rate for such day shall be the average rate quoted to Lender
on such day on such transactions from three Federal funds brokers of recognized
standing.

     "Fixed Charge Ratio" means, for any date of determination, the ratio of (a)
EBITDA for the immediately preceding four (4) calendar quarters, to (b) the sum
of (i) Current Maturities, plus (ii) Interest Expense, plus (iii) Lease Expense,
each for the immediately preceding four (4) calendar quarters.


REVOLVING CREDIT AGREEMENT             9

<PAGE>


     "GAAP" means generally accepted accounting principles consistently applied
as in effect at the time of application of the provisions hereof. 

     "Governmental Authority" means any government, any state or other political
subdivision thereof, or any Person exercising executive, legislative, judicial,
regulatory or administrative functions of or pertaining to government.

     "Guarantor" means each of Spacelink I, Spacelink II, IWL Ltd, and any other
Person executing a Guaranty of the Obligations in favor of the Lender.

     "Guaranty" means a continuing guaranty of payment of the Obligations
(subject to any limitations, reductions in liability, or termination thereof
therein contained), executed by each  Guarantor in favor of Lender, as it may
from time to time be renewed, extended, amended or restated.

     "Intangible Assets" means those assets of Borrower which are (a) deferred
assets, other than prepaid insurance and prepaid taxes, (b) patents, copyrights,
trademarks, trade names, franchises, goodwill, experimental expenses and other
similar assets which would be classified as intangible assets on the balance
sheet of Borrower, prepared in accordance with GAAP, and (c) unamortized debt
discount and expense (excluding any genuine commitment or other loan fees paid
by Borrower to obtain secured financing).

     "Interest Adjustment Date" shall mean the earlier of either the last day of
an Interest Period or the Termination Date.

     "Interest Expense" means, for any period, the interest expense which is
required to be shown as such on the financial statements of Borrower, prepared
in accordance with GAAP.

     "Interest Period" shall mean, with respect to a LIBOR Rate Portion, a
period selected by Borrower of 30, 60 or 90 days, commencing on the Effective
Date of any LIBOR Rate Portion; provided that any Interest Period ending on a
date later than the Maturity Date for the Note under which the applicable LIBOR
Rate Portion was made shall be deemed to end on such Maturity Date.

     "Interest Reduction Date" means the date on which Borrower delivers to
Lender Borrower's audited financial statements for Borrower's 1997 fiscal year;
provided, that, (a) no Event of 


REVOLVING CREDIT AGREEMENT             10

<PAGE>


Default has occurred and is continuing, and (b) Lender, in its sole 
discretion, approves a reduction in the interest rate hereunder due to, among 
other reasons, a risk reduction of the Total Revolving Commitment.

     "Inventory Report" has the meaning set forth in SECTION 6.1(D).

     "IWL Ltd" means IWL Communications Ltd., a Subsidiary of Borrower.

     "Lease Expense" means, for any period, the lease expense under all
Operating Leases for Borrower.

     "Lender" has the meaning set forth in the first paragraph of this Credit
Agreement.

     "LIBOR Margin" means (a) prior to the Interest Reduction Date, 2.40%, and
(b) on and after the Interest Reduction Date, 2.00%.

     "LIBOR Rate" shall mean, with respect to a LIBOR Rate Portion for the
Interest Period applicable thereto, the rate of interest determined by Lender at
which deposits in dollars for the relevant Interest Period and comparable in
amount to the LIBOR Rate Portion in question are offered based on information
presented on the Telerate Screen as of 11:00 A.M. (London time) on the day which
is two (2) Business Days prior to the first day of such Interest Period;
PROVIDED, that if at least two such offered rates appear on the Telerate Screen
in respect of such Interest Period, the arithmetic mean of all such rates (as
determined by Lender) will be the rate used; PROVIDED, FURTHER, that if Telerate
ceases to provide LIBOR quotations, such rate shall be the average rate of
interest determined by Lender at which deposits in U.S. dollars are offered for
the relevant Interest Period by Lender (or its successor) to banks with combined
capital and surplus in excess of $500,000,000 in the London interbank market as
of 11:00 A.M. (London time) on the applicable Effective Date.

     "LIBOR Rate Advance" shall mean an Advance or any portion of an Advance
which bears interest computed with reference to the Adjusted LIBOR Rate.

     "LIBOR Rate Portion" shall mean that portion or portions of the Total
Revolving Commitment which bears interest computed with reference to the
Adjusted LIBOR Rate.


REVOLVING CREDIT AGREEMENT             11

<PAGE>


     "LIBOR Reserve Requirement" shall mean, on any day, that percentage
(expressed as a decimal fraction) which is in effect on such date, if any, as
provided by the Federal Reserve System for determining the maximum reserve
requirements generally applicable to financial institutions regulated by the
Federal Reserve Board comparable in size and type to Lender (including, without
limitation, basic supplemental, marginal and emergency reserves) under
Regulation D with respect to "Eurocurrency liabilities" as currently defined in
Regulation D, or under any similar or successor regulation with respect to
Eurocurrency liabilities or Eurocurrency funding (or, if reserves for
Eurocurrency liabilities are not separately stated in such regulations, the
other applicable category of liabilities which includes deposits by reference to
which the interest rate on a LIBOR Rate Portion is determined).  Each
determination by Lender of the LIBOR Reserve Requirement, shall, in the absence
of manifest error, be conclusive and binding.

     "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset. 
For the purposes of this Credit Agreement, a Person shall be deemed to own
subject to a Lien any asset which it has acquired or holds subject to the
interest of a vendor or lessor under any conditional sale agreement, capital
lease or other title retention agreement relating to such asset.  

     "Loan Documents" means (a) this Credit Agreement, (b) the Note, (c) the
Security Documents, (d) each Guaranty, (e) all other certificates, documents or
instruments delivered in connection with this Credit Agreement, the Note, or the
Security Documents, as such may hereafter be renewed, amended, restated or
supplemented from time to time, and (f) any and all future renewals, amendments,
restatements or supplements to, all or any part of the foregoing.

     "Margin Regulations" mean Regulations G, T, U and X of the Board of
Governors of the Federal Reserve System, as in effect from time to time.  

     "Margin Stock" means "margin stock" as defined in Regulation U of the
Margin Regulations.  

     "Material Adverse Effect" means with respect to a Person (including,
without limitation, Borrower), an effect on the business, financial condition,
operations or assets of such Person, which does or could materially and
adversely affect Borrower's ability to pay and perform the Obligations.



REVOLVING CREDIT AGREEMENT             12

<PAGE>

     "Maximum Lawful Rate" means the maximum rate (or, if the context so 
permits or requires, an amount calculated at such rate) of interest which, at 
the time in question would not cause the interest charged on the portion of 
the Advances owed to Lender at such time to exceed the maximum amount which 
Lender would be allowed to contract for, charge, take, reserve, or receive 
under applicable law after taking into account, to the extent required by 
applicable law, any and all relevant payments or charges under the Loan 
Documents.  To the extent the laws of the State of Texas are applicable for 
purposes of determining the "Maximum Lawful Rate," such term shall mean the 
"indicated rate ceiling" from time to time in effect under Article 1.04, 
Title 79, Revised Civil Statutes of Texas, 1925, as amended, or, if permitted 
by applicable law and effective upon the giving of the notices required by 
such Article 1.04 (or effective upon any other date otherwise specified by 
applicable law), the "quarterly ceiling" or "annualized ceiling" from time to 
time in effect under such Article 1.04, whichever Lender shall elect to 
substitute for the "indicated rate ceiling," and VICE VERSA, each such 
substitution to have the effect provided in such Article 1.04, and Lender 
shall be entitled to make such election from time to time and one or more 
times and, without notice to Borrower, to leave any such substitute rate in 
effect for subsequent periods in accordance with subsection (h)(1) of such 
Article 1.04.  

     "Minimum Notice Requirement" has the meaning set forth in SECTION 2.3.

     "Note" means that certain promissory note, dated the date hereof, 
executed by Borrower in favor of Lender evidencing the Total Revolving 
Commitment and the Advances.

     "Obligations" means all present and future indebtedness, obligations and 
liabilities, and all renewals and extensions thereof, or any part thereof, of 
Borrower, to Lender arising pursuant to the Loan Documents, and all interest 
accrued thereon and costs, expenses, and attorneys' fees incurred in the 
enforcement or collection thereof, regardless of whether such indebtedness, 
obligations and liabilities are direct, indirect, fixed, contingent, 
liquidated, unliquidated, joint, several or joint and several.

     "Operating Lease" means any operating lease, as defined in the Financial 
Accounting Standard Board Statement of Financial Accounting Standards No. 13 
dated November, 1976, or otherwise in 

REVOLVING CREDIT AGREEMENT             13
<PAGE>

accordance with GAAP.

     "PBGC" means the Pension Benefit Guaranty Corporation, or its successors.

     "Pension Plan" means any Employee Plan that is now or was previously 
covered by Title IV of ERISA or subject to the minimum funding standards 
under Section 412 of the Code.

     "Permitted Disposition" means any sale of stock of Borrower in 
connection with (a) an initial public offering, and (b) any stock option plan 
approved by Borrower's board of directors in accordance with sound business 
judgment and so long as any such plan does not require any fundings or stock 
purchases by Borrower.

     "Permitted Liens" means:
     
     (a)  Liens and encumbrances in favor of Lender;

     (b)  Liens for taxes, assessments or other governmental charges incurred 
in the ordinary course of business and not yet past due or being contested in 
good faith by appropriate proceedings and with proper reserves therefor 
maintained in accordance with GAAP;

     (c)  Liens not delinquent created by statute in connection with worker's 
compensation, unemployment insurance, social security and similar statutory 
obligations;

     (d)  Liens of mechanics, materialmen, carriers, warehousemen or other 
like statutory or common law liens securing obligations incurred in good 
faith in the ordinary course of business that are not yet due and payable or 
that are being contested in good faith by appropriate proceedings and with 
proper reserves therefor maintained in accordance with GAAP;

     (e)  encumbrances consisting of easements, rights of way, zoning 
restrictions or other similar restrictions on the use of real property, none 
of which materially impairs the use of such property by Borrower or any 
Subsidiary in the operation of the business for which it is used and none of 
which is violated in any material respect by any existing or proposed 
structure or land use; and

     (f)  Liens on furniture, fixtures and equipment for purchase 

REVOLVING CREDIT AGREEMENT             14
<PAGE>

money financing (including loans and leases) hereafter existing.

     "Person" means an individual, a corporation, a partnership, a limited 
liability company, an association, a trust or any other entity or 
organization, including a government or political subdivision or an agency or 
instrumentality thereof.

     "Regulatory Change" means the adoption after the date hereof of any 
applicable law, rule or regulation, or any change after the date hereof in 
any applicable law, rule or regulation, or any change after the date hereof 
in the interpretation or administration thereof by any Governmental Authority 
charged with the administration thereof.

     "Reporting Date" means each March 31, June 30, September 30 and December 
31, during the Credit Period.

     "Request for Advance" has the meaning set forth in SECTION 2.2.

     "RCRA" has the meaning set forth in SECTION 6.13.

     "SARA" has the meaning set forth in SECTION 6.13.

     "Security Agreement" means that certain Security Agreement, dated the 
date hereof, by and between Borrower and Lender, pursuant to which Borrower 
has granted a fist lien security interest to Lender in all of its equipment, 
machinery, accounts receivable, inventory and other assets now or hereafter 
owned by Borrower as security for payment of the Obligations.

     "Security Documents" means (i) the Security Agreement, (ii) all other 
documents or instruments granting a Lien in favor of Lender as collateral for 
the Advances, (iii) all financing statements related thereto, and all 
modifications, renewals or extensions thereof, and (iv) any documents 
executed in modification, renewal, extension or replacement of any of the 
foregoing.

     "Spacelink I" means Spacelink Systems, Inc., a Subsidiary of Borrower.

     "Spacelink II" means Spacelink Systems FSC, Inc., a Subsidiary of 
Borrower.

REVOLVING CREDIT AGREEMENT             15
<PAGE>

     "Subsidiary" means any corporation or other entity of which securities 
or other ownership interests having ordinary voting power to elect a majority 
of the board of directors or other persons performing similar functions 
(including that of a general partner) are at the time directly or indirectly 
owned, collectively, by Borrower and any Subsidiaries of Borrower.  The term 
Subsidiaries shall include, without limitation, all entities set forth in 
SCHEDULE III attached hereto, and Subsidiaries of Subsidiaries (and so on).

     "Tangible Net Worth" means, as of any date, the total shareholder's 
equity (including capital stock, additional paid-in capital and retained 
earnings) which would appear on a balance sheet of Borrower prepared as of 
such date in accordance with GAAP LESS the aggregate book value of Intangible 
Assets shown on such balance sheet.

     "Taxes" means all taxes, assessments, filing or other fees, levies, 
imposts, duties, deductions, withholdings, stamp taxes, interest equalization 
taxes, capital transaction taxes, foreign exchange taxes or other charges of 
any nature whatsoever, from time to time or at any time imposed by law or any 
federal, state or local governmental agency, other than Taxes imposed upon 
Lender with respect to any of its franchises, businesses, income or profits.

     "Telerate Screen" means the display designated as Screen 3750 on the 
Telerate System or such other screen on the Telerate System as shall display 
the London interbank offered rates for deposits in U.S. dollars quoted by 
selected banks.

     "Termination Date" means October 31, 1998.

     "Total Revolving Commitment" has the meaning set forth in SECTION 2.1.

     "Usage Fee" has the meaning set forth in SECTION 2.6.

     SECTION 1.2.   ACCOUNTING TERMS AND DETERMINATIONS.  Unless otherwise 
specified herein, all accounting terms used herein shall be interpreted, all 
accounting determinations hereunder shall be made, and all financial 
statements required to be delivered hereunder shall be prepared on a 
consolidated basis with Borrower's Subsidiaries in accordance with GAAP as in 
effect from time to time, applied on a basis consistent with the most recent 
audited 

REVOLVING CREDIT AGREEMENT             16
<PAGE>

financial statements of Borrower.

     SECTION 1.3.   GENDER AND NUMBER.  Words of any gender used in this 
Credit Agreement shall be held and construed to include any other gender and 
words in the singular number shall be held to include the plural, and vice 
versa, unless the context requires otherwise.

     SECTION 1.4.   REFERENCES TO CREDIT AGREEMENT.  Use of the words 
"herein", "hereof", "hereinabove", and the like are and shall be construed as 
references to this Credit Agreement.  All references in this Credit Agreement 
to Schedules, Exhibits, Articles, Section, subsections, paragraphs and 
subparagraphs refer to the respective subdivisions of this Credit Agreement, 
unless such reference specifically identifies another document.





REVOLVING CREDIT AGREEMENT             17
<PAGE>

                                  ARTICLE II

                          TOTAL REVOLVING COMMITMENT

     SECTION 2.1.   COMMITMENT.  During the Credit Period, Lender agrees, 
subject to SECTIONS 2.1(c) AND ARTICLE V and the other terms and conditions 
set forth in this Credit Agreement, to make Advances to Borrower from time to 
time for working capital and other general corporate purposes in an aggregate 
amount not to exceed the lesser of (a) $5,000,000.00 in the aggregate at any 
one time outstanding (the "TOTAL REVOLVING COMMITMENT") or (b) the Borrowing 
Base.  Each Advance under the Total Revolving Commitment shall be in the 
principal amount of not less than $100,000.00, with respect to Base Rate 
Advances, and $500,000, with respect to LIBOR Rate Advances.  Subject to the 
foregoing limitations, Borrower may borrow under this SECTION 2.1, repay or 
prepay the Note and reborrow under this SECTION 2.1 at any time during the 
Credit Period.  

     SECTION 2.2.   METHOD OF BORROWING.

     Borrower shall be entitled to obtain Advances under the Total Revolving 
Commitment from Lender pursuant to SECTION 2.1 in the following manner:  

          (a)  BASE RATE ADVANCES.   In the case of any Advance which shall 
initially bear interest with respect to the Applicable Base Rate, Borrower, 
through an Authorized Officer, shall give Lender on the date of any such 
proposed Advance, a Request for Advance specifying its desire to borrow such 
Advance hereunder.  Notice shall be given to Lender prior to 1:00 p.m., 
Dallas, Texas time.  Such Request for Advance shall be accompanied by the 
documents required to be delivered pursuant to ARTICLE V.  

          (b)  LIBOR RATE ADVANCES.  In the case of any Advance which shall 
initially bear interest with respect to the LIBOR Rate, Borrower, through an 
Authorized Officer, shall give Lender at least three (3) Business Days prior 
to the date of any such proposed Advance, a Request for Advance specifying 
its desire to borrow such Advance hereunder.  Notice shall be given to Lender 
prior to 10:00 a.m., Dallas, Texas time, in order for such Business Day to 
count toward the minimum number of Business Days required.  LIBOR Rate  
Advances shall in all cases be subject to availability and to SECTION 3.4 
hereof.  For LIBOR Rate Advances, the Request for Advance shall specify the 
requested funding date, which shall be a 

REVOLVING CREDIT AGREEMENT             18
<PAGE>

Business Day, the amount of the proposed Advance to be made by Lender, the 
Interest Period selected (provided that no such Interest Period shall extend 
past the Termination Date and shall be accompanied by the documents required 
to be delivered pursuant to ARTICLE V.  Such Advance shall be in an amount 
not less than Five Hundred Thousand and No/100 Dollars ($500,000.00).

     SECTION 2.3.   INTEREST RATE.

          (a)  Interest on the Advances shall accrue at a rate per annum 
equal to the lesser of (i) at Borrowers' option, the Applicable Base Rate or 
the Adjusted LIBOR Rate (the "APPLICABLE RATE"), or (ii) the Maximum Lawful 
Rate. Without notice to Borrowers or anyone else, the Applicable Base Rate 
and the Maximum Lawful Rate shall each automatically fluctuate upward and 
downward as and in the amount by which the Applicable Base Rate and Maximum 
Lawful Rate, respectively, fluctuate, subject always to limitations contained 
in this Agreement. 

          (b)  Upon at least three (3) Business Days' prior written notice to 
Lender ("MINIMUM NOTICE REQUIREMENT"), Borrower may through an Authorized 
Officer, on any Interest Adjustment Date (other than the Termination Date), 
convert amounts of any LIBOR Rate Portion into a Base Rate Portion with 
interest accruing thereon, with reference to the Base Rate Portion, as 
provided in SECTION 2.2 above.

          (c)  Upon satisfaction by Borrower of the Minimum Notice 
Requirement, and subject to the conditions provided in this Agreement or the 
Note, Borrower may through an Authorized Officer, on any date prior to the 
Termination Date, convert amounts of not less than Five Hundred Thousand and 
No/100 Dollars ($500,000.00) in the aggregate on the same date of any Base 
Rate Portion into a LIBOR Rate Portion with interest accruing thereon with 
reference to the Adjusted LIBOR Rate as provided in SECTION 2.2 above, for 
the Interest Period selected in such notice.

          (d)  To the extent Borrower has not made an effective election 
under and in accordance with SUBPARAGRAPHS (A) OR (B) above (including, 
without limitation, at the expiration of an Interest Period), the Applicable 
Rate shall be the rate specified pursuant to the provisions contained herein 
for a Base Rate Portion.  If Borrower has failed to make such election at the 
end of an Interest Period, Lender shall be deemed to have made a Base Rate 
Portion in the amount, and in replacement, of the LIBOR Rate 

REVOLVING CREDIT AGREEMENT             19
<PAGE>

Portion then maturing.

          Each notice of a LIBOR Rate election by Borrower must be given by 
an Authorized Officer, must satisfy the Minimum Notice Requirement and shall 
include the following:  (i) Borrower's election of the Adjusted LIBOR Rate; 
(ii) Borrower's choice of an Interest Period during which the Adjusted LIBOR 
Rate will apply; (iii) Borrower's election of the effective date (the 
"EFFECTIVE DATE") on which the LIBOR Rate Portion shall begin; and (iv) the 
amount of outstanding loan principal which for any LIBOR Rate Portion shall 
not be less than Five Hundred Thousand and No/100 Dollars ($500,000.00), to 
which the Adjusted LIBOR Rate shall apply.  Borrower shall give notice of 
such election to Lender.

     Borrower's election to convert to a LIBOR Rate Portion is subject to the 
following conditions:  (1) the Interest Period shall be limited to a period 
commencing on the Effective Date and ending on a date 30, 60 or 90 days later 
elected by Borrower in its notice to Lender; (2) Borrower's written notice of 
an election shall be received by Lender in time to satisfy the Minimum Notice 
Requirement; (3) the last day of the Interest Period will not be subsequent 
in time to the Termination Date; (4) in the case of a continuation of a LIBOR 
Rate Portion, the Interest Period applicable after such continuation shall 
commence on the last day of the preceding Interest Period; (5) no LIBOR Rate 
election shall be made if Lender notifies Borrower that it has determined by 
reason of circumstances affecting the interbank Eurodollar market that either 
adequate or reasonable means do not exist for ascertaining the Adjusted LIBOR 
Rate for any Interest Period, or it becomes impracticable for Lender to 
obtain funds by purchasing U.S. dollars in the interbank Eurodollar market, 
or if Lender determines that the Adjusted LIBOR Rate will not adequately or 
fairly reflect the costs to Lender of maintaining the applicable LIBOR Rate 
Portion at such rate, or if as a result of any Regulatory Change, it shall 
become unlawful or impossible for Lender to maintain any such LIBOR Rate 
election; and (6) no LIBOR Rate election shall be made after the occurrence 
and during the continuance of an Event of Default.

     If, on or after the Effective Date, any Regulatory Change shall make it 
unlawful or impossible for Lender (or its Eurodollar lending office) to make, 
maintain or fund LIBOR Rate Portions or if Lender determines that it may not 
lawfully continue to maintain and fund any of its outstanding LIBOR Rate 
Portions to maturity, Borrower shall immediately prepay in full the then 
outstanding 

REVOLVING CREDIT AGREEMENT             20
<PAGE>

principal amount of Lender's LIBOR Rate Portions, together with accrued 
interest thereon.  

     Borrower shall indemnify Lender against any Consequential Loss which 
Lender may sustain or incur as a consequence of Borrower's failure to make a 
payment on the date such payment is due hereunder or the payment, prepayment 
or conversion of any LIBOR Rate Portion hereunder on a day other than an 
Interest Adjustment Date.

     Borrowers shall also indemnify Lender against and reimburse Lender for 
increased costs to Lender, as a result of any Regulatory Change, in the 
maintaining of any LIBOR Rate Portions.  All payments made pursuant to this 
paragraph shall be made free and clear, without reduction for, or account of, 
any present or future taxes or other levies of any nature, excluding income, 
franchises, business, and profits taxes.

     SECTION 2.3.   REVOLVING NOTE.  The Advances shall be evidenced by the 
Note.

     SECTION 2.4.   TERMINATION OF TOTAL REVOLVING COMMITMENT.  The Total 
Revolving Commitment shall terminate on October 31, 1998, and, after such 
date, Lender shall have no obligation under this ARTICLE II.

     SECTION 2.5.   INTEREST RATE.  Interest shall accrue on the outstanding 
principal balance of the Note at a rate per annum equal to the lesser of (a) 
at Borrower's option, (i) the Applicable Base Rate in effect from day to day, 
or (ii) the Adjusted LIBOR Rate, or (b) the Maximum Lawful Rate, each change 
in the Applicable Base Rate to be effective without notice to Borrower on the 
effective date of each such change, PROVIDED THAT in no event shall the rate 
charged hereunder or under the Note exceed the Maximum Lawful Rate.  Interest 
on the Note shall be due and payable on or before the first (1st) day of each 
calendar month during the Credit Period, commencing with the first (1st) day 
of the month immediately following the initial Advance and continuing on the 
first (1st) day of each successive month thereafter until maturity.  Interest 
shall be computed based on the number of actual days elapsed assuming that 
each calendar year consisted of 360 days.

     SECTION 2.6.   USAGE FEE.  Borrower shall pay to Lender a usage fee at a 
rate per annum equal to the product of (a) three-eighths of one percent 
(.375%), multiplied by (b) the average daily unused portion of the Total 
Revolving Commitment.  Such 

REVOLVING CREDIT AGREEMENT             21
<PAGE>

average daily unused portion shall be reduced by the daily outstanding Letter 
of Credit Exposure and shall be computed based on the number of actual days 
elapsed assuming each calendar year consisted of 360 days.  Such Usage Fee 
shall be due and payable on each January 1, April 1, July 1 and October 1 of 
each year during the Credit Period and, upon maturity of the Note.

                                 ARTICLE III

              GENERAL PROVISIONS RELATED TO LOAN PAYMENTS; FEES

     SECTION 3.1.   GENERAL PROVISIONS AS TO PAYMENTS.  Borrower shall make 
each payment of principal of, and interest on, the Advances and all fees 
payable hereunder not later than 10:00 a.m.  (Dallas, Texas time) on the date 
when due, in immediately available funds in Dallas, Texas, to Lender at its 
address referred to in SECTION 9.1.  Upon payment by Borrower to Lender of 
any amounts due and owing pursuant to this Credit Agreement, Borrower shall 
be discharged from all obligations with respect to such payment.  Whenever 
any payment of principal of, or interest on, the Advances or of fees shall be 
due on a day which is not a Business Day, the date for payment thereof shall 
be extended to the next succeeding Business Day.  Prior to the occurrence of 
an Event of Default, all payments made on the Advances shall be applied first 
to accrued but unpaid interest and then to principal.  After the occurrence 
of an Event of Default, all payments made on the Advances shall be applied in 
such manner as Lender shall determine in its sole discretion.

     SECTION 3.2.   OVERDUE PRINCIPAL AND INTEREST.  Any overdue principal of 
and, to the extent permitted by law, overdue interest on any Advance (after 
giving effect to all grace periods) shall bear interest, payable on demand, 
for each day until paid at a rate per annum equal to the lesser of the 
Maximum Lawful Rate or the sum of four percent (4%) plus the Base Rate (the 
"DEFAULT RATE").

     SECTION 3.3.   MAXIMUM LAWFUL RATE.  If at any time the Applicable Rate 
(the "contract rate") is limited to the Maximum Lawful Rate, any subsequent 
reductions in the contract rate shall not reduce the rate of interest on the 
affected Advance below the Maximum Lawful Rate until the total amount of 
interest accrued equals the amount of interest which would have accrued if 
the contract rate had at all times been in effect.  In the event that at 
maturity (stated or by acceleration), or at final payment of the Note, the 
total amount of interest paid or accrued on such Note is 

REVOLVING CREDIT AGREEMENT             22
<PAGE>

less than the amount of interest which would have accrued if the contract 
rate had at all times been in effect with respect thereto, then at such time, 
to the extent permitted by law, Borrower shall pay to the holder of the Note 
an amount equal to the difference between (a) the lesser of the amount of 
interest which would have accrued if the contract rate had at all times been 
in effect and the amount of interest which would have accrued if the Maximum 
Lawful Rate had at all times been in effect, and (b) the amount of interest 
actually paid on such Note.

     SECTION 3.4.   INCREASED COSTS AND LEGAL RESTRICTIONS APPLICABLE TO 
TOTAL REVOLVING COMMITMENT.  If, after the date hereof, any Regulatory Change 
shall occur which:

     (a)  imposes, modifies or deems applicable any reserve, special deposit, 
compensatory loan, deposit insurance, capital adequacy, minimum capital, 
capital ratio or similar requirement against all or any assets held by, 
deposits or accounts with, credit extended by or to, or commitments to extend 
credit or any other acquisition of funds by Lender which affects financial 
transactions entered into by Lender similar to the transactions contemplated 
by this Credit Agreement, or imposes on Lender any other condition affecting 
the maintaining its Total Revolving Commitment; or

     (b)  subjects Lender to, or causes the termination or reduction of a 
previously granted exemption with respect to, any Taxes with respect to 
maintaining its Total Revolving Commitment;

and the result of any of the foregoing events is to increase the cost to 
Lender of maintaining the Total Revolving Commitment or to reduce the amount 
of any sums received or receivable by it under this Credit Agreement or any 
other Loan Document, or to reduce the rate of return on Lender's equity in 
connection with this Credit Agreement, as the case may be, then, in any such 
case, Borrower shall, within five (5) days of demand by Lender pay such 
additional amount or amounts as will compensate Lender for any such 
additional cost, reduced benefit, reduced amount received or reduced rate of 
return.  Lender shall use its best efforts (consistent with its internal 
policy and legal and regulatory restrictions) to avoid such additional cost, 
reduced benefit, reduced amount received or reduced rate of return; provided, 
however, that the failure of Lender to take any action shall not limit or 
otherwise affect the obligations of Borrower under this SECTION 3.4.  If 
Lender sustains or incurs any additional cost, reduced benefit, reduced amount

REVOLVING CREDIT AGREEMENT             23
<PAGE>

received or reduced rate of return, its demand for payment pursuant to this 
SECTION 3.4 shall include a written statement of the nature and amounts 
thereof, which statement shall be presumed correct and prima facie evidence 
of the amounts thereof.  Lender will exercise reasonable efforts to provide 
such statement promptly after learning of the basis therefore, but the 
failure of Lender to act promptly shall not limit or otherwise affect the 
obligations of Borrower under this SECTION 3.4.

     SECTION 3.5.   PREPAYMENTS OF ADVANCES; REDUCTION OF TOTAL REVOLVING 
COMMITMENT.

          (a)  In the event that the outstanding principal balance of the 
Note exceeds the Borrowing Base, Borrower shall immediately make a payment to 
Lender in an amount sufficient to reduce the outstanding principal balance 
under the Note to an amount which would be equal to or less than the 
Borrowing Base.   

          (b)  Borrower may terminate the Total Revolving Commitment at any 
time and from time to time provided that notice of such termination must be 
received by Lender by 10:00 a.m. Dallas, Texas, time on the first Business 
Day preceding the effective date of such termination; provided, that upon 
termination of the Total Revolving Commitment, any amounts outstanding under 
any AGF Note shall be due and payable in full.

          (c)  Borrower shall be entitled to reduce the Total Revolving 
Commitment provided that Borrower prepays an amount sufficient to reduce the 
outstanding principal balance under the Note to an amount equal to or less 
than the reduced amount of the Total Revolving Commitment.  Any such 
reduction shall be in a minimum amount of at least One Million and No/100 
Dollars ($1,000,000.00), and in whole multiples of One Million and No/100 
Dollars ($1,000,000.00) thereafter; provided, that Borrower may not reduce 
the Total Revolving Commitment below $2,000,000 unless Borrower has elected 
to terminate the Total Revolving Commitment in full.  Borrower shall also pay 
to Lender any Consequential Losses incurred by Lender as a result of such 
reduction in the Total Revolving Commitment.

          (d)  If Borrower shall prepay any LIBOR Rate Portion prior to the 
expiration of its applicable Interest Period, Borrower shall pay Lender a 
prepayment fee in an amount equal to the consequential loss (the 
"CONSEQUENTIAL LOSS") incurred by Lender as a result of any such prepayment, 
such Consequential Loss to be an 

REVOLVING CREDIT AGREEMENT             24
<PAGE>

amount equal to any losses, costs or expenses incurred by Lender by virtue of 
such prepayment, which such loss, cost or expense shall include that which 
Lender may sustain or incur in liquidating or employing deposits from Lender 
or third parties acquired to effect, fund or maintain any such LIBOR Rate 
Portion.  Such loss or expense shall include, without limitation, (i) any 
expense or penalty incurred by Lender in redepositing such principal amount, 
plus (ii) any "breakage" fees that Lender is required to pay by reason of the 
early breakage of any customary LIBOR or other contract entered into by 
Lender in connection with providing funds for such LIBOR Rate Portion.  Any 
prepayment fee required to be paid by Borrower pursuant to this SECTION 3.5 
or any other provisions of this Agreement or of the other Loan Documents in 
connection with the prepayment of any LIBOR Rate Portion shall be due and 
payable whether such prepayment is being made voluntarily or involuntarily, 
including, without limitation, as a result of an acceleration of sums due 
under LIBOR Rate Portions or any part thereof due to an Event of Default.

                                  ARTICLE IV

                COLLATERAL FOR THE TOTAL REVOLVING COMMITMENT

     SECTION 4.1.   SECURITY.  The Total Revolving Commitment and the Note 
shall be secured by (a) a first priority security interest in all of the 
inventory, accounts, equipment and other personal property of Borrower, and 
(b) the joint and several guaranty of payment of the Obligations made by each 
Subsidiary of Borrower.  

     SECTION 4.2.   DOCUMENTATION.  In order to evidence the security for the 
Obligations set forth in SECTION 4.1, Borrower shall:

     (a)  execute and deliver to Lender the Security Agreement, pursuant to 
which Borrower shall grant to Lender a first priority security interest in 
all of the personal property of Borrower;  

     (b)  execute and deliver all necessary financing statements and such 
other documents, instruments and agreements as Lender shall deem reasonably 
necessary or appropriate to create and perfect in favor of Lender a first and 
prior Lien in and to all of the personal property of Borrower; and 

     (c)  cause each Guarantor to execute and deliver a Guaranty.



REVOLVING CREDIT AGREEMENT             25
<PAGE>

                                  ARTICLE V

                       CONDITIONS PRECEDENT TO ADVANCES

     The obligation of Lender to make a Advance hereunder is subject to the 
satisfaction of the following conditions: 

     SECTION 5.1.   ALL ADVANCES.  In the case of each Advance:

     (a)  timely receipt by Lender of a Request for Advance;

     (b)  immediately before and after giving effect to such Advance, no 
Default shall have occurred and be continuing and the making of any Advance 
shall not cause a Default;

     (c)  the representations and warranties contained in this Credit 
Agreement and in the other Loan Documents shall be true and correct in all 
material respects on and as of the date of such Advance subject to any 
changes in such representations and warranties not prohibited in this 
Agreement, except that all representations and warranties that speak as of a 
particular date shall only be required on the date of each such Advance to be 
true and correct in all material respects as of the date to which such 
representation or warranty speaks and not as of any subsequent date; and

     (d)  a written certificate of Borrower as of the date of such Advance as 
to (i) the solvency of Borrower (determined in accordance with SECTION 
6.5(b)) and (ii) the intended use of the proceeds of such Advance.

     Each Advance hereunder shall be deemed to be a representation and 
warranty by Borrower on the date of such Advance as to the facts specified in 
SECTIONS 5.1(b) AND (c).

     SECTION 5.2.   CLOSING DATE.  On or before the Closing Date:

     (a)  if an Advance is requested for disbursement on the Closing Date, 
satisfaction of all conditions contained in SECTION 5.1; 

     (b)  receipt by Lender of this Credit Agreement, duly executed by 
Borrower;

REVOLVING CREDIT AGREEMENT             26
<PAGE>

     (c)  receipt by Lender of the Note, duly executed by Borrower;

     (d)  receipt by Lender of a Guaranty of the Obligations in favor of 
Lender, duly executed by each Guarantor;

     (e)  receipt by Lender of the Security Agreement, duly executed by 
Borrower;

     (f)  receipt by Lender of all other Security Documents required by 
Lender as of the Closing Date, duly executed;

     (g)  receipt by Lender of an opinion of counsel for Borrower, favorably 
opining as to the due organization and existence of Borrower, the 
enforceability of each of the Loan Documents and otherwise being in form and 
substance satisfactory to Lender; and

     (h)  receipt by Lender of all resolutions, certificates or documents it 
may request relating to the existence of Borrower, the corporate authority 
for the execution and validity of this Credit Agreement and the other Loan 
Documents and any other matters relevant hereto, all in form and substance 
satisfactory to Lender.

     The documents, certificates and opinions referred to in this SECTION 5.2 
shall be delivered to Lender no later than the Closing Date.  The 
certificates, opinions and documents referred to in this SECTION 5.2 shall, 
where Lender deems appropriate, be dated the Closing Date.  

                                  ARTICLE VI

                        REPRESENTATIONS AND WARRANTIES

     Borrower represents and warrants that:

     SECTION 6.1.   USE OF PROCEEDS.  Borrower will use the proceeds of the 
Advances for the purposes set forth in SECTION 2.1 hereof.  Borrower will 
not, directly or indirectly, use any of the proceeds of the Advances for the 
purpose of purchasing or carrying, or retiring any Debt which was originally 
incurred to purchase or carry, any "margin stock" as defined in the Margin 
Regulations, or to purchase or carry any "security that is publicly-held" 
within the meaning of Regulation T of the Board of Governors of the Federal 
Reserve System, or otherwise take or permit any action which would involve a 
violation of such Margin Regulations or any 

REVOLVING CREDIT AGREEMENT             27
<PAGE>

other regulation of such Board of Governors.  The Advances are not secured, 
directly or indirectly, in whole or in part, by collateral that includes any 
"margin stock" within the meaning of the Margin Regulations.  Borrower will 
not engage principally, or as one of its important activities, in the 
business of extending credit for the purpose of purchasing or carrying any 
"margin stock" within the meaning of the Margin Regulations.

     SECTION 6.2.   CORPORATE EXISTENCE AND POWER.  Borrower is a 
corporation, duly organized, validly existing and in good standing under the 
laws of the state of its organization, and has all power and authority 
necessary to carry on its business as now conducted.

     SECTION 6.3.   CORPORATE AND GOVERNMENTAL AUTHORIZATION; CONTRAVENTION. 
The execution, delivery and performance of this Credit Agreement and the 
other Loan Documents by Borrower are within its corporate powers, have been 
duly authorized by all necessary corporate action, require no action by or in 
respect of, or filing with, any governmental body, agency or official and do 
not contravene, or constitute a default under, any provision of applicable 
law or regulation (including, without limitation, the Margin Regulations) or 
of the articles of incorporation or bylaws of Borrower or of any material 
judgment, injunction, order, decree or material agreement binding upon 
Borrower or its assets, or result in the creation or imposition of any Lien 
on any asset of Borrower, except as contemplated thereby.

     SECTION 6.4.   BINDING EFFECT.  This Credit Agreement constitutes a 
valid and binding agreement of Borrower.  The Note and each other Loan 
Document when executed and delivered in accordance with this Credit 
Agreement, will constitute a valid and binding obligation of Borrower, each 
enforceable in accordance with its terms except as (a) the enforceability 
thereof may be limited by bankruptcy, insolvency or similar laws affecting 
creditors rights generally, and (b) the availability of equitable remedies 
may be limited by equitable principles of general applicability.

     SECTION 6.5.   FINANCIAL INFORMATION.  

          (a)  The current financial statements of Borrower and all the other 
financial reports and information of Borrower that have been delivered to 
Lender are true and correct in all material respects as of the date of such 
current financial statements and other reports and information.

REVOLVING CREDIT AGREEMENT             28
<PAGE>

          (b)  Except as disclosed in writing to Lender prior to the Closing 
Date, since the later of March 31, 1997, or the date of the most recent 
quarterly financial statements delivered to Lender, there has been no 
material adverse change in the business, financial position or results of 
operations of Borrower; and, there exists no condition, event or occurrence 
that could reasonably be expected to have a Material Adverse Effect on 
Borrower.

     SECTION 6.5.   LITIGATION.  There is no action, suit or proceeding 
pending against, or to the knowledge of Borrower, threatened against or 
affecting Borrower before any court or arbitrator, any governmental body, 
agency or official which could reasonably be anticipated to have a Material 
Adverse Effect on Borrower, or which could in any manner draw into question 
the validity of the Loan Documents.

     SECTION 6.7.   TAXES AND FILING OF TAX RETURNS.  Borrower has filed all 
tax returns required to have been filed and has paid or has made adequate 
provision for payment of all Taxes shown to be due and payable on such 
returns, including interest and penalties, and all other Taxes which are 
payable by Borrower, to the extent the same have become due and payable.  
Borrower has no knowledge of any proposed Tax assessment against it other 
than customary ad valorem taxes or other Taxes to become due in the normal 
course of business, and Borrower has made adequate provisions for all Tax 
liabilities.  No income tax liability of Borrower has been asserted by the 
Internal Revenue Service for Taxes in excess of those already paid.

     SECTION 6.8.   BUSINESS; COMPLIANCE.  Borrower has performed and abided 
by all obligations required to be performed by it under all agreements to 
which it is a party, if its failure to so perform would have a Material 
Adverse Effect.

     SECTION 6.9.   LICENSES, PERMITS, ETC.  Borrower possesses such valid 
franchises, certificates, licenses, permits, consents, authorizations, 
exemptions and orders of tribunals as are necessary to carry on its business 
as now being conducted and as proposed to be conducted, and which if not 
possessed by Borrower would have a Material Adverse Effect.

     SECTION 6.10.  COMPLIANCE WITH LAW.  The business and operations of 
Borrower have been and are being conducted in accordance with all applicable 
laws, rules and regulations of all tribunals, other than violations which 
could not (either 

REVOLVING CREDIT AGREEMENT             29
<PAGE>

individually or collectively) have a Material Adverse Effect.

     SECTION 6.11.  FULL DISCLOSURE.  No written information heretofore 
furnished by Borrower or, to the knowledge of Borrower, on behalf of Borrower 
to Lender for the purposes of this Credit Agreement or any transaction 
contemplated hereby, contained and no written information hereafter furnished 
by Borrower to Lender for purposes of this Credit Agreement or any 
transaction contemplated hereby will contain, any untrue statement of a 
material fact or omit a material fact necessary to make the statements 
therein not materially misleading in light of the facts and circumstances 
existing at the time.

     SECTION 6.12.  FISCAL YEAR.  Borrower's fiscal year ends on June 30th of 
each year.

     SECTION 6.13.  ENVIRONMENTAL MATTERS.  Except as otherwise disclosed to 
Lender, Borrower (i) does not know of any environmental condition or 
circumstance, such as the presence of any hazardous substance (as defined in 
SECTION 6.12), adversely affecting the properties or operation of Borrower, 
(ii) has not received any report of a violation by Borrower of any Applicable 
Environmental Law, or (iii) do not know that Borrower is under any obligation 
to remedy any violation of any Applicable Environmental Law.

     SECTION 6.14.  SUBSIDIARIES.  Borrower has no Subsidiaries other than 
those set forth in SCHEDULE III attached hereto.  Borrower's ownership 
percentages in such Subsidiaries is as set forth in SCHEDULE III.

     SECTION 6.15.  ERISA.

          (a)  Each Employee Plan has been maintained and administered in 
substantial compliance with the applicable requirements of the Code and ERISA 
except to the extent that the failure to have done so would not have a 
Material Adverse Effect on Borrower.  No circumstances exist with respect to 
any Employee Plan that could have a Material Adverse Effect on Borrower.

          (b)  With respect to each Pension Plan, (i) no accumulated funding 
deficiency (within the meaning of Section 412(a) of the Code), whether waived 
or unwaived, exists; (ii) the present value of accrued benefits (based on the 
most recent actuarial valuation prepared for each such plan, if any, in 

REVOLVING CREDIT AGREEMENT             30
<PAGE>

accordance with ongoing assumptions) does not exceed the current value of 
plan assets allocable to such benefits by a material amount; (iii) no 
reportable event (within the meaning of Section 4043 of ERISA) other than 
purchases and sales of securities from a plan trustee as reported in the 
audited financial statements of such plan has occurred; (iv) no uncorrected 
prohibited transactions (within the meaning of Section 4975 of the Code) 
exist; (v) to the extent such plan is covered by PBGC, no material liability 
to the PBGC exists and no circumstances exist that could reasonably be 
expected to result in any such liability; and (vi) no material withdrawal 
liability (within the meaning of Section 4201(a) of ERISA) exists and no 
circumstances exist that could reasonably be expected to result in any such 
liability; except, with respect to each of the foregoing clauses in this 
subparagraph (b), where such existence, excess or occurrence, as applicable, 
does not have and could not have a Material Adverse Effect on Borrower.

          (c)  As of the date hereof, Borrower has no obligation under any 
Employee Plan to provide post-employment health care benefits to any of its 
current or former employees that could have a Material Adverse Effect on 
Borrower, except as may be required by Section 4980B of the Code.





REVOLVING CREDIT AGREEMENT             31
<PAGE>

                                 ARTICLE VII

                                  COVENANTS

     Borrower agrees that so long as Lender has any obligation under ARTICLE 
II hereof or any amount payable under the Note remains unpaid: 

     SECTION 7.1.   INFORMATION.  Borrower will deliver, or cause to be 
delivered, to Lender:

     (a)  as soon as available and in any event within ninety (90) days after 
the end of each fiscal year of Borrower, an audited balance sheet of Borrower 
as of the end of such fiscal year and the related audited statements of 
income and changes in cash flow for such fiscal year, all reported by 
Borrower in accordance with GAAP, and audited by an independent public 
accountant acceptable to Lender; 

     (b)  as soon as available and in any event within forty-five (45) days 
after the end of each quarter in each fiscal year of Borrower, an unaudited 
balance sheet of Borrower as of the end of such quarter and the related 
unaudited statements of income and cash flow for such quarter, all reported 
by Borrower in accordance with GAAP, subject to year-end audit adjustment; 

     (c)  simultaneously with the delivery of each set of financial 
statements referred to in SECTIONS 7.1(a) AND (b), a Compliance Certificate 
of Borrower as to compliance with the financial covenants contained in 
SECTIONS 7.2 signed by an Authorized Officer of Borrower;

     (d)  as soon as available and in any event within thirty (30) days after 
the end of each calendar month, (i) a Borrowing Base Certificate, dated as of 
the last day of the immediately preceding month,  (ii) a report showing, as 
of such date, the Accounts of Borrower and the Eligible Accounts (the 
"ACCOUNTS RECEIVABLE REPORT") in such detail as shall be acceptable to Lender 
and the aging of all of such Accounts in categories of current, thirty (30) 
days past due, sixty-one (61) or more days past due and ninety (90) or more 
days past due, and (iii) a report showing, as of such date, the inventory of 
Borrower and the Eligible Inventory (the "INVENTORY REPORT") in such detail 
as shall be acceptable to Lender  (each such report shall be certified as 
being complete and correct in all material respect by the chief financial 
officer of Borrower 

REVOLVING CREDIT AGREEMENT             32
<PAGE>

or another authorized officer or representative of such party reasonably 
acceptable to Lender);

     (e)  as soon as available, any and all public filings and any reports or 
other information delivered to Borrower's shareholders generally as such; and

     (f)  from time to time such additional financial statements and 
financial information regarding the financial position or business of 
Borrower as Lender may reasonably request.

     SECTION 7.2.   FINANCIAL COVENANTS.  Borrower covenants and agrees that: 

     (a)  MINIMUM TANGIBLE NET WORTH.  In no event shall Borrower permit its 
Tangible Net Worth to be less than the sum of (i) $3,200,000.00, plus (ii) 
the proceeds from any equity offering by Borrower, plus (iii) as of the end 
of each fiscal quarter commencing with September 30, 1997, the product of (A) 
fifty percent (50%) times (B) the net income of Borrower for the immediately 
preceding fiscal quarter; provided, that in no case shall such sum be less 
than the minimum Tangible Net Worth calculated hereunder for the previous 
quarter.

     (b)  DEBT TO WORTH RATIO.  In no event shall Borrower permit the ratio 
of its Debt to Tangible Net Worth to be in excess of 1.65 to 1.

     (c)  FIXED CHARGE RATIO.  In no event shall Borrower permit its Fixed 
Charge Ratio to be less than 1.25 to 1.

     (d)  CURRENT RATIO.  In no event shall Borrower permit its Current Ratio 
to be less than 1.15 to 1.

     (e)  RESTRICTION ON DISTRIBUTIONS.  Borrower shall not declare, make or 
incur any liability to make any Distribution.

     SECTION 7.3.   CONSOLIDATIONS, MERGERS, SALES OF ASSETS, AND 
MAINTENANCE. Neither Borrower nor any Subsidiary of Borrower will (a) 
consolidate or merge with or into any other Person unless immediately 
following such consolidation or merger no Default will have occurred and 
Borrower is the surviving entity, (b) sell, lease, abandon or otherwise 
transfer all or any material part of Borrower's or any Subsidiary's assets to 
any other Person except in the ordinary course of business, (c) terminate, or 
fail to 

REVOLVING CREDIT AGREEMENT             33
<PAGE>

maintain, its existence, or (d) terminate, or fail to maintain, its good 
standing and qualification to transact business in all jurisdictions where 
the failure to maintain its good standing or qualification to transact 
business could reasonably be expected to have a Material Adverse Effect.

     SECTION 7.4.   USE OF PROCEEDS.  Borrower will use the proceeds of the 
Advances solely for the purposes represented in this Credit Agreement and 
shall not use such proceeds, directly or indirectly, for the purpose, whether 
immediate, incidental or ultimate, of purchasing or carrying any Margin Stock 
and none of such proceeds will be used in violation of applicable law 
(including, without limitation, the Margin Regulations).

     SECTION 7.5.   RIGHT OF INSPECTION; RIGHT OF AUDIT.  Borrower will 
permit any officer, employee or agent of Lender, upon reasonable notice (a) 
to visit and inspect any of the assets of Borrower and each Subsidiary, (b) 
to examine Borrower's and each Subsidiary's books of record and accounts and 
take copies and extracts therefrom, (c) to discuss the affairs, finances and 
accounts of Borrower and each Subsidiary with Borrower's and each 
Subsidiary's officers, accountants and auditors, and (d) to conduct or have 
conducted at Lender's expense an audit of Borrower's inventory and accounts 
receivable.  

     SECTION 7.6.   LIMITATION ON DEBT.  Neither Borrower nor any Subsidiary 
shall incur any Debt, except for (a) the Obligations, (b) trade payables or 
trade letters of credit incurred in the ordinary course of business, (c) the 
Debt described on SCHEDULE I attached hereto and any refinancings or 
extensions of such Debt so long as the amount of any such Debt is not 
increased by any such refinancing or extension, (d) purchase money Debt, (e) 
capital lease obligations, and (f) Debt between and among Borrower and its 
Subsidiaries (subject, however to the limitation contained in SECTION 7.15).

     SECTION 7.7.   LIMITATION ON SALE OF PROPERTIES.  Neither Borrower nor 
any Subsidiary shall sell, assign, convey, exchange, lease or otherwise 
dispose of any of its properties, rights, assets or business, whether now 
owned or hereafter acquired, except (a) in the ordinary course of its 
business, and (b) obsolete or worn out property, or equipment sold in 
contemplation of the acquisition of replacement equipment of at least equal 
value or utility.

     SECTION 7.8.   LIMITATIONS ON LIENS.  Neither Borrower nor any 

REVOLVING CREDIT AGREEMENT             34
<PAGE>

Subsidiary shall create, incur, assume or suffer to exist any Lien upon any 
of its assets other than Liens existing as of the Closing Date and described 
in SCHEDULE II and Permitted Liens.

     SECTION 7.9.   MAINTENANCE OF INSURANCE.  Borrower and each Subsidiary 
will at all times maintain or cause to be maintained insurance covering such 
risks as are customarily carried by businesses similarly situated including, 
without limitation, the following: (a) worker's compensation insurance; (b) 
employer's liability insurance; (c) comprehensive general public liability 
and property damage insurance in respect of all activities in which Borrower 
or any Subsidiary might incur personal liability for the death or injury of 
an employee or third person, or damage to or destruction of another's 
property; (d) insurance against loss or damage by fire, lightning, hail, 
tornado, explosion and other similar risk; (e) comprehensive automobile 
liability insurance, and (f) business interruption insurance; PROVIDED that 
any worker's compensation, similar insurance required by applicable law.  
Borrower shall deliver to Lender each insurance policy or certificates 
evidencing the policies carried by Borrower or any Subsidiary which show, 
among other things, the name of the insurer, the amount of coverage, the 
risks insured against, and such other related information as Lender may 
reasonably request.

     SECTION 7.10.  PAYMENT OF TAXES AND CLAIMS.  Borrower and each 
Subsidiary will pay (a) all Taxes imposed upon it or any of its assets or 
with respect to any of its franchises, businesses, income or profits before 
any material penalty or interest accrues thereon and (b) all material claims 
(including, without limitation, claims for labor, services, materials and 
supplies) for sums which have become due and payable and which by law have or 
might become a Lien on any of its assets; provided, however, no payment of 
Taxes or claims shall be required if (i) the amount, applicability or 
validity thereof is currently being contested in good faith by appropriate 
action promptly initiated and diligently conducted in accordance with good 
business practices and no material part of the property or assets of Borrower 
or any Subsidiary are subject to levy or execution, (ii) Borrower or the 
applicable Subsidiary, as required in accordance with GAAP, shall have set 
aside on its books reserves (segregated to the extent required by GAAP) 
deemed by it to be adequate with respect thereto, and (iii) Borrower has 
notified Lender of such circumstances, in detail reasonably satisfactory to 
Lender.

     SECTION 7.11.  COMPLIANCE WITH LAWS AND DOCUMENTS.  Neither 

REVOLVING CREDIT AGREEMENT             35
<PAGE>

Borrower nor any Subsidiary will directly or indirectly, violate the 
provisions of any laws, its organizational documents or any agreement to 
which it is a party, if such violation, alone or when combined with all other 
such violations, could reasonably be expected to have a Material Adverse 
Effect.

     SECTION 7.12.  ENVIRONMENTAL LAW COMPLIANCE AND INDEMNITY.  Borrower and 
each Subsidiary agree to promptly pay and discharge when due all debts, 
claims, liabilities and obligations with respect to any clean-up measures 
necessary for it to comply with Applicable Environmental Laws affecting it.  
Borrower hereby indemnifies and agrees to defend and hold Lender and its 
successors and assigns harmless from and against any and all claims, demands, 
causes of action, loss, damage, liabilities, costs and expenses (including 
reasonable attorneys' fees and court costs) of any and every kind or 
character, known or unknown, fixed or contingent, asserted against or 
incurred by Lender at any time and from time to time including, without 
limitation, those asserted or arising subsequent to the payment or other 
satisfaction of the Note, by reason of, arising out of or related in any way 
to Lender's entering into this Agreement and the transactions herein 
contemplated, INCLUDING MATTERS ARISING OUT OF THE ORDINARY NEGLIGENCE OF 
LENDER (WHETHER SOLE, CONTRIBUTORY, COMPARATIVE OR OTHERWISE), BUT EXCLUDING 
MATTERS ARISING OUT OF THE GROSS NEGLIGENCE OR WILLFUL MISCONDUCT OF LENDER.  
It shall not be a defense to the covenant of Borrower to indemnify that the 
act, omission, event or circumstance did not constitute a violation of any 
Applicable Environmental Law at the time of its existence or occurrence.  The 
terms "HAZARDOUS SUBSTANCE" and "RELEASE" shall have the meanings specified 
in the Superfund Amendments and Reauthorization Act of 1986 ("SARA"), and the 
terms "SOLID WASTE" and "DISPOSED" shall have the meanings specified in the 
Resource Conservation and Recovery Act of 1976 ("RCRA"); provided, to the 
extent that any other applicable laws of the United States of America or 
political subdivision thereof establish a meaning for "hazardous substance," 
"release," "solid waste," or "disposed" which is broader than that specified 
in either SARA or RCRA, such broader meaning shall apply.  As used in this 
Agreement, "APPLICABLE ENVIRONMENTAL LAW" shall mean and include the 
singular, and "APPLICABLE ENVIRONMENTAL LAWS" shall mean and include the 
collective aggregate of the following:  Any law, statute, ordinance, rule, 
regulation, order or determination of any governmental authority or any board 
of fire underwriters (or other body exercising similar functions), or any 
restrictive covenant or deed restriction (recorded or otherwise) affecting 
Borrower 

REVOLVING CREDIT AGREEMENT             36
<PAGE>

pertaining to health, safety or the environment, including, without 
limitation, all applicable flood disaster laws and health, safety and 
environmental laws and regulations pertaining to health, safety or the 
environment, including without limitation, the Comprehensive Environmental 
Response, Compensation, and Liability Act of 1980 ("CERCLA"), the Resource 
Conservation and Recovery Act of 1976, the Superfund Amendments and 
Reauthorization Act of 1986, the Occupational Safety and Health Act, the 
Texas Water Code, the Texas Solid Waste Disposal Act, the Texas Workers' 
Compensation Laws, and any federal, state or municipal laws, ordinances, 
regulations or law which may now or hereafter require removal of asbestos or 
other hazardous wastes from any property of Borrower or any Subsidiary or 
impose any liability on Lender related to asbestos or other hazardous wastes 
in any property of Borrower or any Subsidiary.  The provisions of this 
SECTION 7.12 shall survive the repayment of the Note.  In the event of the 
transfer of the Note or any portion thereof, Lender or any prior holder of 
the Note and any participants shall continue to be benefitted by this 
indemnity and agreement with respect to the period of such holding of the 
Note.

     SECTION 7.13.  ADDITIONAL DOCUMENTS.  Borrower shall execute and deliver 
or cause to be executed and delivered such other and further instruments or 
documents as in the judgment of Lender may be required to better effectuate 
the transactions contemplated herein.

     SECTION 7.14.  QUANTITY OF DOCUMENTS.  All certificates, opinions, 
reports and documents to be delivered from time to time hereunder shall be in 
such number of counterparts as Lender may reasonably request.

     SECTION 7.15.  INVESTMENTS.  Neither Borrower nor any Subsidiary will, 
directly or indirectly, make any loans, advances, extensions of credit, 
guarantees in favor of or capital contributions to, make any investment in, 
purchase any stock or securities of, or interests in, any Person, or incur 
Debt to finance the acquisition of any Person or all or a material part of 
the assets of any Person, except (a) investments by Borrower in, or Debt 
funded by Borrower to, any Subsidiary listed in SCHEDULE III attached hereto, 
which investment and Debt shall be limited, however, to an aggregate amount 
equal to the investments and Debt existing as of the Closing Date plus 
$250,000.00, (b) investments in Cash Equivalents, (c) travel advances to 
employees of Borrower or any Subsidiary not to exceed $20,000.00 in the 
aggregate, and (d) accounts receivable incurred in the ordinary course of 

REVOLVING CREDIT AGREEMENT             37
<PAGE>

business.

     SECTION 7.16.  TRANSACTIONS WITH AFFILIATES.  Except with respect to a
transaction permitted under SECTION 7.3, 7.6, AND 7.15, Borrower will not engage
in any material transaction with an Affiliate unless such transaction is as
reasonably favorable to Borrower as could be obtained in an arm's length
transaction with an unaffiliated Person in accordance with prevailing industry
customs and practices.

     SECTION 7.17.  FISCAL YEAR.  Neither Borrower nor any Subsidiary will
change its fiscal year.

     SECTION 7.18.  ERISA.

          (a)  Borrower shall, and shall cause each member of its Controlled
Group (as that term is defined in the Code) to, maintain and administer any
Employee Plan in accordance with the applicable requirements of the Code and
ERISA except to the extent that the failure to do so would not have a Material
Adverse Effect on Borrower.  Borrower shall not permit or suffer to exist any
circumstances with respect to any Employee Plan that could have a Material
Adverse Effect on Borrower.

          (b)  With respect to any Pension Plan, Borrower shall not (i) permit
any accumulated funding deficiency (within the meaning of Section 412(a) of the
Code), whether waived or unwaived, to exist; (ii) permit the present value of
accrued benefits (based on the most recent actuarial valuation prepared for each
such plan, if any, in accordance with ongoing actuarial assumptions) to exceed
the current value of plan assets allocable to such benefits by a material
amount; (iii) permit any reportable event (within the meaning of Section 4043 of
ERISA) to occur, other than purchases and sales of securities from a plan
trustee as reported in the audited financial statements of such plan;
(iv) permit a prohibited transaction (within the meaning of Section 4975 of the
Code) to occur; (v) incur any material liability to the PBGC; or (vi) incur any
material withdrawal liability (within the meaning of Section 4201(a) of ERISA);
except, with respect to each of the foregoing clauses in this subparagraph (b),
where such existence, excess or occurrence, as applicable, does not have or
could not have a Material Adverse Effect on Borrower.

          (c)  Borrower shall not incur a material obligation to provide
post-employment health care benefits to any of its current 


REVOLVING CREDIT AGREEMENT             38

<PAGE>

or former employees that could have a Material Adverse Effect on Borrower, 
except as may be required by Section 4980B of the Code or otherwise required 
by law.

     SECTION 7.19.  CHANGES IN MANAGEMENT.  Borrower shall not voluntarily
change its chief executive officer, chief financial officer or president without
the prior written consent of Lender.

     SECTION 7.20.  REPURCHASE OF STOCK.  Borrower shall not purchase any of its
own stock without the prior written consent of Lender, except to the extent any
holder of any stock options may choose to pay for shares by tendering shares.

     SECTION 7.21.  ADDITIONAL SUBSIDIARIES.  Borrower shall not create,
purchase or otherwise establish any additional Subsidiary without the prior
written consent of Lender.  Borrower acknowledges and agrees that if any such
additional Subsidiary is created,  purchased or otherwise established, such
Subsidiary shall become a Guarantor hereunder.

                                     ARTICLE VIII

                                DEFAULTS AND REMEDIES

     SECTION 8.1.   EVENTS OF DEFAULT.  If one or more of the following events
(collectively "EVENTS OF DEFAULT" and individually an "EVENT OF DEFAULT") shall
have occurred and be continuing:

     (a)  Borrower shall fail to pay when due any principal of or interest on
the Note or any monetary amount due under this Credit Agreement or any other
Loan Document and such failure continues for ten (10) days after written notice
thereof has been given to Borrower by Lender;

     (b)  any covenant, agreement or condition contained in this Credit
Agreement or in any other Loan Document is not fully and timely performed,
observed or kept in all material respects, and the continuation of such failure
for twenty (20) days after written notice thereof has been given to Borrower by
Lender;

     (c)  any representation, warranty, certification or statement made or
deemed to have been made by Borrower in this Credit Agreement or by Borrower or
any other Person in any certificate, financial statement or other document
delivered pursuant to this Credit Agreement, including, without limitation, any
other Loan 


REVOLVING CREDIT AGREEMENT             39

<PAGE>


Document, shall prove to have been incorrect in any material respect when 
made;

     (d)  any event or condition shall occur and continue unremedied or unwaived
for a period beyond any applicable cure period provided pursuant to the terms of
any Debt of Borrower in excess of $100,000.00, which entitles (or, with the
giving of notice or lapse of time or both, would entitle) the holder of any such
Debt to accelerate the maturity thereof;

     (e)  Borrower shall commence a voluntary case or other proceeding seeking
liquidation, reorganization or other relief with respect to itself or its debts
under any bankruptcy, insolvency or other similar law now or hereafter in effect
or seeking the appointment of a trustee, receiver, liquidator, custodian or
other similar official of it or any substantial part of its property, or shall
consent to any such relief or to the appointment of or taking possession by any
such official in an involuntary case or other proceeding commenced against it,
or shall make a general assignment for the benefit of creditors, or shall fail
generally to pay its debts as they become due, or shall take any corporate
action to authorize any of the foregoing; 

     (f)  an involuntary case or other proceeding shall be commenced against
Borrower seeking liquidation, reorganization or other relief with respect to it
or its debts under any bankruptcy, insolvency or other similar law now or
hereafter in effect or seeking the appointment of a trustee, receiver,
liquidator, custodian or other similar official of it or any substantial part of
its property, and such involuntary case or other proceeding shall remain
undismissed and unstayed for a period of sixty (60) days; or an order for relief
shall be entered against Borrower under the federal bankruptcy laws as now or
hereafter in effect; 

     (g)  one (1) or more final judgments or orders for the payment of money in
an aggregate amount outstanding at any time in excess of $100,000 shall be
rendered against Borrower and such judgment or order (i) shall continue
unsatisfied and unstayed (unless bonded with a supersedeas bond at least equal
to such judgment or order) for a period of thirty (30) days or (ii) is not fully
paid and satisfied at least ten (10) days prior to the date on which any of its
assets may be lawfully sold to satisfy such judgment or order;

     (h)  one (1) or more judgments or orders for the payment of money shall be
rendered against Borrower, whether or not otherwise 


REVOLVING CREDIT AGREEMENT             40

<PAGE>

bonded or stayed, which has a Material Adverse Effect;

     (i)  the sale, pledge, encumbrance, assignment or transfer, voluntarily or
involuntarily, of any interest in Borrower (if any such entity is not a natural
person but is a corporation, partnership, trust or other legal entity), without
the prior written consent of Lender, except for Permitted Dispositions; or

     (j)  the occurrence of a default or an event of default under the AGF
Credit Agreement or any AGF Note;

then, and in every such event, Lender may without presentment, notice or demand
(unless expressly provided for herein) of any kind (including, without
limitation, notice of intention to accelerate and acceleration), all of which
are hereby waived, (w) terminate the Total Revolving Commitment and it shall
thereupon terminate, and (x) take such other actions as may be permitted by the
Loan Documents including, declaring the Note (together with accrued interest
thereon) to be, and the Note shall thereupon become, immediately due and
payable; PROVIDED THAT in the case of any of the Events of Default specified in
SECTION 8.1(e) or (f), without any notice to Borrower or any other act by
Lender, the Total Revolving Commitment shall thereupon terminate and the Note
(together with accrued interest thereon) shall become immediately due and
payable.  

     Nothing herein or in any other Loan Document shall operate or be construed
to add on or make cumulative any cure or grace periods specified in any of the
Loan Documents.


                                      ARTICLE IX

                                    MISCELLANEOUS

     SECTION 9.1.   NOTICES.  All notices, requests and other communications to
any party hereunder shall be in writing (including bank wire, telecopy or
similar writing), except for any telephone notices as specifically provided for
herein, may be personally served or sent by telecopier, mail or the express mail
service of the United States Postal Service, Federal Express or other equivalent
overnight or expedited delivery service, and (a) if given by personal service or
telecopier (confirmed by telephone), it shall be deemed to have been given upon
receipt; (b) if sent by telecopier without telephone confirmation, it shall 


REVOLVING CREDIT AGREEMENT             41

<PAGE>

be deemed to have been given twenty-four (24) hours after being given; (c) if 
sent by mail, it shall be deemed to have been given upon the earlier of (i) 
actual receipt, or (ii) three (3) Business Days after deposit in a depository 
of the United States Postal Service, first class mail, postage prepaid; (d) 
if sent by Federal Express, the express mail service of the United States 
Postal Service or other equivalent overnight or expedited delivery service, 
it shall be deemed given upon the earlier of (i) actual receipt or (ii) 
twenty-four (24) hours after delivery to such overnight or expedited delivery 
service, delivery charges prepaid, and properly addressed to Borrower or 
Lender; provided that notices to Lender under ARTICLE II and ARTICLE VIII 
shall not be effective until received. For purposes hereof, the address of 
the parties to this Credit Agreement shall be as set forth on  the signature 
page of this Agreement.  Any party may, by proper written notice hereunder to 
the other parties, change the address to which notices shall thereafter be 
sent to it.  The provisions of this SECTION 9.1 shall control over any 
conflicting contractual notice provisions contained in the Loan Documents.

     SECTION 9.2.   NO WAIVERS.  No failure or delay by Lender in exercising any
right, power or privilege hereunder or under the Note or other Loan Document
shall operate as a waiver thereof nor shall any single or partial exercise
thereof preclude any other or further exercise thereof or the exercise of any
other right, power or privilege.  The rights and remedies herein provided shall
be cumulative and not exclusive of any rights or remedies provided by law or in
any of the other Loan Documents.  

     SECTION 9.3.   EXPENSES; INDEMNIFICATION. (a) Borrower shall pay all
out-of-pocket expenses of Lender, including all fees and disbursements of
counsel for Lender, in connection with the preparation of this Credit Agreement,
the other Loan Documents, and, if applicable, the recordation of the Loan
Documents (provided, that Lender has agreed to pay $4,000 of the aggregate fees
of its counsel in connection with the documentation of all loans to Borrower by
Lender), any waiver or consent hereunder or any amendment hereof or any Default
or alleged Default hereunder, and, if an Event of Default occurs, Borrower shall
pay all out-of-pocket expenses incurred by Lender, including fees and
disbursements of counsel in connection with such Event of Default and collection
and other enforcement proceedings resulting therefrom, fees of auditors and
consultants incurred in connection therewith and investigation expenses incurred
by Lender in connection therewith.


REVOLVING CREDIT AGREEMENT             42

<PAGE>


     (b)  Borrower agrees to indemnify Lender and hold Lender harmless from and
against any and all liabilities, losses, damages, costs and expenses of any kind
(including, without limitation, all fees and disbursements of counsel for Lender
in connection with any investigative, administrative or judicial proceeding,
whether or not Lender shall be designated a party thereto) which may be incurred
by Lender, relating to or arising out of this Credit Agreement or any actual or
proposed use of proceeds of Advances hereunder; PROVIDED THAT LENDER SHALL NOT
HAVE THE RIGHT TO BE INDEMNIFIED HEREUNDER FOR ITS OWN GROSS NEGLIGENCE OR
WILLFUL MISCONDUCT, IT BEING THE INTENTION HEREBY THAT LENDER SHALL BE
INDEMNIFIED FOR THE CONSEQUENCES OF ITS NEGLIGENCE (WHETHER SOLE, CONTRIBUTORY,
COMPARATIVE OR OTHERWISE).  

     SECTION 9.4.   RIGHT OF SET-OFF.  (a) Upon the occurrence and during the
continuance of any Event of Default, Lender is hereby authorized at any time and
from time to time, to the fullest extent permitted by law, to set off and apply
any and all deposits (general or special, time or demand, provisional or final)
at any time held and other indebtedness at any time owing by Lender to or for
the credit or the account of Borrower against any and all of the obligations of
Borrower now or hereafter existing under this Credit Agreement and the Note held
by Lender, irrespective of whether or not Lender shall have made any demand
under this Credit Agreement or the Note, unless such demand is required by the
other terms of this Credit Agreement or the Note.  Lender agrees promptly to
notify Borrower after any such setoff and application made by Lender, provided
that the failure to give such notice shall not affect the validity of such
setoff and application.  The rights of Lender under this SECTION 9.4(a) are in
addition to other rights and remedies (including, without limitation, other
rights of setoff) which Lender may have.  

     (b)  Borrower agrees, to the fullest extent it may effectively do so under
applicable law, that any holder of a participation in the Note may exercise
rights of setoff or counterclaim and other rights with respect to such
participation as fully as if such holder of a participation were a direct
creditor of Borrower in the amount of such participation.

     SECTION 9.5.   AMENDMENTS AND WAIVERS.  Any provision of this Credit
Agreement, the Note or the other Loan Documents may be amended or waived if, but
only if, such amendment or waiver is in writing and is signed by Borrower and
Lender.


REVOLVING CREDIT AGREEMENT             43

<PAGE>


     SECTION 9.5.   SURVIVAL.  All representations, warranties and covenants
made by Borrower herein or in any certificate or other instrument delivered by
it or in its behalf under the Loan Documents shall be considered to have been
relied upon by Lender and shall survive the delivery to Lender of such Loan
Documents or the extension of the Advances (or any part thereof), regardless of
any investigation made by or on behalf of Lender, but shall terminate upon
payment in full of the Obligations and the termination of any obligation of
Lender to make any future Advances.

     SECTION 9.7.   LIMITATION ON INTEREST.  Regardless of any provision
contained in the Loan Documents, Lender shall never be entitled to receive,
collect, or apply, as interest on the Advances, any amount in excess of the
Maximum Lawful Rate, and in the event Lender ever receives, collects or applies
as interest any such excess, such amount which would be deemed excessive
interest shall be deemed a partial prepayment of principal and treated hereunder
as such; and if the Advances are paid in full, any remaining excess shall
promptly be paid to Borrower.  In determining whether or not the interest paid
or payable under any specific contingency exceeds the Maximum Lawful Rate,
Lender shall, to the extent permitted under applicable law, (a) characterize any
nonprincipal payment as an expense, fee or premium rather than as interest, (b)
exclude voluntary prepayments and the effects thereof and (c) amortize, prorate,
allocate and spread, in equal parts, the total amount of the interest throughout
the entire contemplated term of the Note, so that the interest rate is the
Maximum Lawful Rate throughout the entire term of the Note; PROVIDED, HOWEVER,
that if the unpaid principal balance thereof is paid and performed in full prior
to the end of the full contemplated term thereof, and if the interest received
for the actual period of existence thereof exceeds the Maximum Lawful Rate,
Lender shall refund to Borrower the amount of such excess and, in such event,
Lender shall not be subject to any penalties provided by any laws for
contracting for, charging, taking, reserving or receiving interest in excess of
the Maximum Lawful Rate.  

     SECTION 9.8.   INVALID PROVISIONS.  If any provision of the Loan Documents
is held to be illegal, invalid, or unenforceable under present or future laws
effective during the term thereof, such provision shall be fully severable, the
Loan Documents shall be construed and enforced as if such illegal, invalid, or
unenforceable provision had never comprised a part thereof, and the remaining
provisions thereof shall remain in full force and effect 


REVOLVING CREDIT AGREEMENT             44

<PAGE>

and shall not be affected by the illegal, invalid, or unenforceable provision 
or by its severance therefrom.  Furthermore, in lieu of such illegal, 
invalid, or unenforceable provision there shall be added automatically as a 
part of the Loan Documents a provision as similar in terms to such illegal, 
invalid, or unenforceable provision as may be possible and be legal, valid 
and enforceable.  

     SECTION 9.9.   CONFLICT OF TERMS.  The provisions of the other Loan
Documents and any Schedule or Exhibit hereto are incorporated in this Credit
Agreement for all purposes by this reference thereto.  Except as otherwise
provided in this Credit Agreement and except as otherwise provided in the other
Loan Documents by specific reference to the applicable provision of this Credit
Agreement, if any provision contained in this Credit Agreement is in conflict
with, or inconsistent with, any provision in the other Loan Documents the
provision contained in this Credit Agreement shall govern and control.

     SECTION 9.10.  REVOLVING LOAN.  Pursuant to Article 15.10(b) of Chapter 15,
Subtitle 79, Revised Civil Statutes of Texas, 1925, as amended, Borrower agrees
that such Chapter 15 shall not govern or in any manner apply to the Advances.  

     SECTION 9.11.  SUCCESSORS AND ASSIGNS.  The provisions of this Credit
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns, except that Borrower may not assign
or otherwise transfer any of its rights under this Credit Agreement.  Lender may
assign or participate all or any part of its interest in the Total Revolving
Commitment.  Lender shall notify Borrower of any assignments or participations
by Lender of any of its interest in the Total Revolving Commitment.

     SECTION 9.12.  TEXAS LAW.  THIS CREDIT AGREEMENT, THE NOTE AND ALL OTHER
LOAN DOCUMENTS SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF
THE STATE OF TEXAS.

     SECTION 9.13.  COUNTERPARTS; EFFECTIVENESS.  This Credit Agreement may be
signed in any number of counterparts, each of which shall be an original, with
the same effect as if the signatures thereto and hereto were upon the same
instrument.  This Credit Agreement shall become effective when Lender shall have
received counterparts hereof signed by all of the parties hereto.

     SECTION 9.14.  NO THIRD PARTY BENEFICIARIES.  It is expressly 


REVOLVING CREDIT AGREEMENT             45

<PAGE>

intended that there shall be no third party beneficiaries of the covenants, 
agreements, representations or warranties herein contained other than 
transferees or assignees of all or any part of Lender's interest hereunder.

     SECTION 9.15.  ENTIRE AGREEMENT.  This Credit Agreement and the other Loan
Documents constitute the entire understanding and agreement between Borrower and
Lender with respect to the transactions arising in connection with the Advances
and supersede all prior written or oral understandings and agreements between
Borrower and Lender with respect to the matters addressed in the Loan Documents.
Borrower hereby acknowledges that, except as incorporated in writing in the Loan
Documents, there are not, and were not, and no Persons are or were authorized by
Lender to make, any representations, understandings, stipulations, agreements or
promises, oral or written, with respect to the matters addressed in the Loan
Documents.

     THE WRITTEN LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE
PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.


REVOLVING CREDIT AGREEMENT             46

<PAGE>


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


                                       BORROWER:


IWL Communications, Inc.               IWL COMMUNICATIONS, INC., a 
12000 Aerospace Avenue                 Texas corporation
Suite 200
Houston, Texas 77034                   By: /s/ Richard H. Roberson
Attn: Chief Financial Officer             -----------------------------------
                                       Name:  Richard H. Roberson
                                            ---------------------------------
                                       Title:  CFO
                                             --------------------------------




                                       LENDER:


1717 Main  Street                      BANK ONE, TEXAS, N.A., a
3rd Floor                              national banking association
Dallas, Texas  75201
Attn:     Mark Wade,                   By: /s/ Mark Wade
          Vice President                  -----------------------------------
                                          Mark Wade
                                          Vice President









REVOLVING CREDIT AGREEMENT             47