<PAGE>







                                 AMENDED AND RESTATED


                                   CREDIT AGREEMENT

                                       between

                               IWL COMMUNICATIONS, INC.

                                         and

                                BANK ONE, TEXAS, N.A.




                                   August 28, 1997



<PAGE>

                                  TABLE OF CONTENTS

ARTICLE I

     TERMS DEFINED . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
     SECTION 1.1.   DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . .  1
     SECTION 1.2.   ACCOUNTING TERMS AND DETERMINATIONS. . . . . . . . . . . 13
     SECTION 1.3.   GENDER AND NUMBER. . . . . . . . . . . . . . . . . . . . 13
     SECTION 1.4.   REFERENCES TO CREDIT AGREEMENT . . . . . . . . . . . . . 13

ARTICLE II 

     COMMITMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     SECTION 2.1.   COMMITMENT . . . . . . . . . . . . . . . . . . . . . . . 14
     SECTION 2.2.   METHOD OF BORROWING. . . . . . . . . . . . . . . . . . . 14
     SECTION 2.3.   INTEREST RATE. . . . . . . . . . . . . . . . . . . . . . 15
     SECTION 2.3.   REVOLVING NOTE; TERM NOTE. . . . . . . . . . . . . . . . 16
     SECTION 2.4.   TERMINATION OF TOTAL REVOLVING COMMITMENT. . . . . . . . 16
     SECTION 2.5.   INTEREST RATE. . . . . . . . . . . . . . . . . . . . . . 17
     SECTION 2.6.   USAGE FEE. . . . . . . . . . . . . . . . . . . . . . . . 17


ARTICLE III

     GENERAL PROVISIONS RELATED TO LOAN PAYMENTS; FEES . . . . . . . . . . . 17
     SECTION 3.1.   GENERAL PROVISIONS AS TO PAYMENTS. . . . . . . . . . . . 17
     SECTION 3.2.   OVERDUE PRINCIPAL AND INTEREST . . . . . . . . . . . . . 18
     SECTION 3.3.   MAXIMUM LAWFUL RATE. . . . . . . . . . . . . . . . . . . 18
     SECTION 3.4.   INCREASED COSTS AND LEGAL RESTRICTIONS APPLICABLE 
                     TO TOTAL REVOLVING COMMITMENT . . . . . . . . . . . . . 18

ARTICLE IV

     COLLATERAL FOR THE TOTAL REVOLVING COMMITMENTAND THE TERM LOAN. . . . . 20
     SECTION 4.1.   SECURITY . . . . . . . . . . . . . . . . . . . . . . . . 20
     SECTION 4.2.   DOCUMENTATION. . . . . . . . . . . . . . . . . . . . . . 20
     SECTION 4.3.   SECURITY AGREEMENT AS SECURITY FOR THE TERM LOAN . . . . 20

ARTICLE V

     CONDITIONS PRECEDENT TO ADVANCES. . . . . . . . . . . . . . . . . . . . 20
     SECTION 5.1.   ALL ADVANCES . . . . . . . . . . . . . . . . . . . . . . 21
     SECTION 5.2.   CLOSING DATE . . . . . . . . . . . . . . . . . . . . . . 21

<PAGE>

ARTICLE VI

     REPRESENTATIONS AND WARRANTIES. . . . . . . . . . . . . . . . . . . . . 22
     SECTION 6.1.   USE OF PROCEEDS. . . . . . . . . . . . . . . . . . . . . 22
     SECTION 6.2.   CORPORATE EXISTENCE AND POWER. . . . . . . . . . . . . . 22
     SECTION 6.3.   CORPORATE AND GOVERNMENTAL AUTHORIZATION; 
                     CONTRAVENTION . . . . . . . . . . . . . . . . . . . . . 22
     SECTION 6.4.   BINDING EFFECT . . . . . . . . . . . . . . . . . . . . . 22
     SECTION 6.5.   FINANCIAL INFORMATION. . . . . . . . . . . . . . . . . . 22
     SECTION 6.6.   LITIGATION . . . . . . . . . . . . . . . . . . . . . . . 23
     SECTION 6.7.   TAXES AND FILING OF TAX RETURNS. . . . . . . . . . . . . 23
     SECTION 6.8.   BUSINESS; COMPLIANCE . . . . . . . . . . . . . . . . . . 23
     SECTION 6.9.   LICENSES, PERMITS, ETC . . . . . . . . . . . . . . . . . 23
     SECTION 6.10.  COMPLIANCE WITH LAW. . . . . . . . . . . . . . . . . . . 23
     SECTION 6.11.  FULL DISCLOSURE. . . . . . . . . . . . . . . . . . . . . 23
     SECTION 6.12.  FISCAL YEAR. . . . . . . . . . . . . . . . . . . . . . . 23
     SECTION 6.13.  ENVIRONMENTAL MATTERS. . . . . . . . . . . . . . . . . . 24
     SECTION 6.14.  SUBSIDIARIES . . . . . . . . . . . . . . . . . . . . . . 24
     SECTION 6.15.  ERISA. . . . . . . . . . . . . . . . . . . . . . . . . . 24

ARTICLE VII

     COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
     SECTION 7.1.   INFORMATION. . . . . . . . . . . . . . . . . . . . . . . 25
     SECTION 7.2.   FINANCIAL COVENANTS. . . . . . . . . . . . . . . . . . . 25
     SECTION 7.3.   CONSOLIDATIONS, MERGERS, SALES OF ASSETS, 
                     AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . 26
     SECTION 7.4.   USE OF PROCEEDS. . . . . . . . . . . . . . . . . . . . . 26
     SECTION 7.5.   RIGHT OF INSPECTION; RIGHT OF AUDIT. . . . . . . . . . . 26
     SECTION 7.6.   LIMITATION ON DEBT . . . . . . . . . . . . . . . . . . . 26
     SECTION 7.7.   LIMITATION ON SALE OF PROPERTIES . . . . . . . . . . . . 27
     SECTION 7.8.   LIMITATIONS ON LIENS . . . . . . . . . . . . . . . . . . 27
     SECTION 7.9.   MAINTENANCE OF INSURANCE . . . . . . . . . . . . . . . . 27
     SECTION 7.10.  PAYMENT OF TAXES AND CLAIMS. . . . . . . . . . . . . . . 27
     SECTION 7.11.  COMPLIANCE WITH LAWS AND DOCUMENTS . . . . . . . . . . . 27
     SECTION 7.12.  ENVIRONMENTAL LAW COMPLIANCE AND INDEMNITY . . . . . . . 27
     SECTION 7.13.  ADDITIONAL DOCUMENTS . . . . . . . . . . . . . . . . . . 28
     SECTION 7.14.  QUANTITY OF DOCUMENTS. . . . . . . . . . . . . . . . . . 29
     SECTION 7.15.  INVESTMENTS. . . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.16.  TRANSACTIONS WITH AFFILIATES . . . . . . . . . . . . . . 29
     SECTION 7.17.  FISCAL YEAR. . . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.18.  ERISA. . . . . . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.19.  CHANGES IN MANAGEMENT. . . . . . . . . . . . . . . . . . 30
     SECTION 7.20.  REPURCHASE OF STOCK. . . . . . . . . . . . . . . . . . . 30
     SECTION 7.21.  ADDITIONAL SUBSIDIARIES. . . . . . . . . . . . . . . . . 30

<PAGE>

ARTICLE VIII

     DEFAULTS AND REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . 30
     SECTION 8.1.   EVENTS OF DEFAULT. . . . . . . . . . . . . . . . . . . . 30

ARTICLE IX

     MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 9.1.   NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 9.2.   NO WAIVERS . . . . . . . . . . . . . . . . . . . . . . . 32
     SECTION 9.3.   EXPENSES; INDEMNIFICATION. . . . . . . . . . . . . . . . 32
     SECTION 9.4.   RIGHT OF SET-OFF . . . . . . . . . . . . . . . . . . . . 33
     SECTION 9.5.   AMENDMENTS AND WAIVERS . . . . . . . . . . . . . . . . . 33
     SECTION 9.6.   SURVIVAL . . . . . . . . . . . . . . . . . . . . . . . . 33
     SECTION 9.7.   LIMITATION ON INTEREST . . . . . . . . . . . . . . . . . 34
     SECTION 9.8.   INVALID PROVISIONS . . . . . . . . . . . . . . . . . . . 34
     SECTION 9.9.   CONFLICT OF TERMS. . . . . . . . . . . . . . . . . . . . 34
     SECTION 9.10.  REVOLVING LOAN . . . . . . . . . . . . . . . . . . . . . 34
     SECTION 9.11.  SUCCESSORS AND ASSIGNS . . . . . . . . . . . . . . . . . 34
     SECTION 9.12.  TEXAS LAW. . . . . . . . . . . . . . . . . . . . . . . . 35
     SECTION 9.13.  COUNTERPARTS; EFFECTIVENESS. . . . . . . . . . . . . . . 35
     SECTION 9.14.  NO THIRD PARTY BENEFICIARIES . . . . . . . . . . . . . . 35
     SECTION 9.15.  ENTIRE AGREEMENT . . . . . . . . . . . . . . . . . . . . 35
     SECTION 9.16.  AMENDMENT AND RESTATEMENT. . . . . . . . . . . . . . . . 35

                                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

<PAGE>
                                       
                             AMENDED AND RESTATED
                               CREDIT AGREEMENT

    THIS AMENDED AND RESTATED CREDIT AGREEMENT (this "CREDIT AGREEMENT") is 
entered into as of the 28th 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 and Lender entered into that certain Revolving Credit 
Agreement (the "EXISTING CREDIT AGREEMENT") dated as of August 1, 1997, 
whereby Lender made a revolving loan to Borrower in an amount not to exceed 
$5,000,000.00 to be used by Borrower for working capital purposes and for 
other general corporate purposes; and

    WHEREAS, Borrower has requested that Lender make a term loan to Borrower 
in the amount of $1,055,000.00 (the "TERM LOAN"), the proceeds of which are 
to be used for the finance or refinance of the acquisition cost of certain 
specified equipment; and 

    WHEREAS, Lender has agreed to amend the Existing Credit Agreement to 
accommodate Borrower's 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 amend and restate the 
Existing Credit Agreement in its entirety 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 Effective Date, plus (b) the FDIC Percentage in effect on the 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 1
<PAGE>

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 (i) the advance under the Term Note on the Closing Date, 
and (ii) 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) with respect to the Revolving Note  (i) 
prior to the Interest Reduction Date, the Base Rate, and (ii) after the 
Interest Reduction Date, the Base Rate, minus one-half of one percent (.50%), 
and (b) with respect to the Term Note, the Base Rate.

    "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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 2
<PAGE>

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 or the Term Loan, as applicable, 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 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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 3
<PAGE>

    "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, which amends and restates 
in its entirety  the Existing Credit Agreement, as the same may be amended or 
restated from time to time.

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

    "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 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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 4
<PAGE>

    "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 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; 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 5
<PAGE>

         (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;

         (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);

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 6
<PAGE>

         (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

         (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.

    "Existing Credit Agreement" has the meaning set forth in the Recitals on 
Page 1 hereof.

    "Existing Equipment" means the equipment described on Schedule I attached 
hereto and incorporated herein by this reference.

    "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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 7
<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 of 
either the Revolving Note or the Term Note, as applicable, a period selected 
by Borrower of 30, 60 or 90 days, commencing on the Effective Date of any 
such 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 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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 8
<PAGE>

    "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) with respect to the Revolving Note, (i) prior to 
the Interest Reduction Date, 2.40%, and (ii) on and after the Interest 
Reduction Date, 2.00%, and (b) with respect to the Term Note, 2.40%.

    "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 or the Term Note, as applicable, which bears interest 
computed with reference to the Adjusted LIBOR Rate.

    "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.  

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 9
<PAGE>

    "Loan Documents" means (a) this Credit Agreement, (b) the Revolving Note, 
(c) the Term Note, (d) the Security Documents, (e) each Guaranty, (f) all 
other certificates, documents or instruments delivered in connection with 
this Credit Agreement, the Revolving Note, the Term Note, or the Security 
Documents, as such may hereafter be renewed, amended, restated or 
supplemented from time to time, and (g) 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.

    "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 each of (i) the Revolving Note and (ii) the Term Note.

    "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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 10
<PAGE>

    "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 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 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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 11
<PAGE>

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.

    "Revolving Note" means that certain promissory note, dated as of August 
1, 1997, executed by Borrower in favor of Lender evidencing the Total 
Revolving Commitment and the Advances.

    "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 as of 
August 1, 1997, 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.

    "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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 12
<PAGE>

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.

    "Term Loan" has the meaning set forth in the Recitals on Page 1 hereof.

    "Term Loan Maturity Date" means September 1, 2001.

    "Term Note" means that certain Promissory Note dated of even date 
herewith in the original principal amount of the Term Loan executed by 
Borrower and payable to the order of Lender, which Term Note evidences the 
Term Loan.

    "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 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 the Existing Credit Agreement, as amended and restated hereby.  
All references in this Credit Agreement to Schedules, Exhibits, Articles, 
Section, subsections, paragraphs and subparagraphs refer to the respective 
subdivisions of the Existing Credit Agreement, as amended and restated 
hereby, unless such reference specifically identifies another document.

                                 ARTICLE II

                                 COMMITMENT

    SECTION 2.1.   COMMITMENT.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 13
<PAGE>

    (a)  TOTAL REVOLVING COMMITMENT.  During the Credit Period, Lender 
agrees, subject to 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 (i) $5,000,000.00 in the aggregate at any one 
time outstanding (the "TOTAL REVOLVING COMMITMENT") or (ii) 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(a), repay 
or prepay the Revolving Note and reborrow under this SECTION 2.1(a) at any 
time during the Credit Period.  

    (b)  TERM LOAN.  Lender agrees, subject to  ARTICLE V and the other terms 
and conditions set forth in this Credit Agreement, to make the Term Loan to 
Borrower in one Advance on the Closing Date.  The proceeds of the Term Loan 
shall be used to refinance or finance the acquisition cost of the Existing 
Equipment and for no other purpose.  Borrower understands and agrees that as 
a condition to making the Advance of the Term Loan, Lender shall be entitled 
to receive all invoices, purchase orders, bills of sale or other evidence 
satisfactory to Lender of the purchase of the Existing Equipment for the 
purchase price set forth in Schedule I attached hereto.

    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 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.

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 14
<PAGE>

         (a)  Interest on the Advances shall accrue at a rate per annum equal 
to the lesser of (i) at Borrower's option, the Applicable Base Rate or the 
Adjusted LIBOR Rate (the "APPLICABLE RATE"), or (ii) the Maximum Lawful Rate. 
Without notice to Borrower 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 
Credit 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 
with respect to the Total Revolving Commitment and other than the Term Loan 
Maturity Date with respect to the Term Loan), 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 Credit Agreement 
or the Note, Borrower may through an Authorized Officer, on any date prior to 
(i) the Termination Date with respect to the Total Revolving Commitment and 
(ii) the Term Loan Maturity Date with respect to the Term Loan, 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 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; (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; and (v) whether such election 
shall be with respect to the Total Revolving Commitment or the Term Loan.  
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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 15
<PAGE>

to (a) the Termination Date with respect to the Total Revolving Commitment 
and (b) the Term Loan Maturity Date with respect to the Term Loan; (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 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.

    Borrower 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; TERM NOTE.  The Advances under the Total 
Revolving Commitment shall be evidenced by the Revolving Note; the Advance 
under the Term Loan shall be evidenced by the Term 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 with respect to the Total Revolving 
Commitment under this ARTICLE II.

    SECTION 2.5.   INTEREST RATE.  

    (a)  TOTAL REVOLVING COMMITMENT.  Interest shall accrue on the 
outstanding principal balance of the Revolving 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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 16
<PAGE>

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 
Revolving Note exceed the Maximum Lawful Rate. Interest on the Revolving 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.

    (b)  TERM LOAN.  Interest shall accrue on the outstanding principal 
balance of the Term 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 Term Note exceed the Maximum Lawful Rate.  
Commencing on October 1, 1997 and continuing on the first (1st) day of each 
successive calendar month thereafter until the Term Note is paid in full, 
Borrower shall(i) pay Lender an accrued but unpaid interest owing under the 
Term Note and (ii) make payment of principal under the Term Note to Lender in 
the amount of Twenty-One Thousand Nine Hundred Seventy-Nine and 17/100 
Dollars ($21,979.17). Borrower shall pay to Lender the entire outstanding 
principal balance of the Term Note, together with all accrued but unpaid 
interest thereon and all other amounts owing with respect thereto, on the 
Term Loan Maturity Date   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 average daily unused portion 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 Revolving 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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 17
<PAGE>

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 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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 18
<PAGE>

cost, reduced benefit, reduced amount 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 
Revolving 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 Revolving 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 Revolving 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 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 Credit 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, 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 19
<PAGE>

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
                              AND THE TERM LOAN

    SECTION 4.1.   SECURITY.  The Total Revolving Commitment, the Term Loan, 
the Revolving Note and the Term Note shall be secured by (a) a first priority 
security interest in all of the inventory, accounts, equipment (including, 
without limitation, the Existing 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.

    SECTION 4.3.   SECURITY AGREEMENT AS SECURITY FOR THE TERM LOAN.  
Borrower and Lender each acknowledge and agree that the term Obligations as 
defined in the Security Agreement includes the Term Loan and that the Term 
Loan is secured by the Security Agreement.  At the time when the Security 
Agreement was executed by Borrower, Lender and Borrower contemplated that (i) 
Lender would make additional loans to Borrower, and (ii) such loans would be 
secured by the Security Agreement.  Lender and Borrower agree that the Term 
Loan is such a Loan.

                                  ARTICLE V

                       CONDITIONS PRECEDENT TO ADVANCES

    The obligation of Lender to make an 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;

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 20
<PAGE>

    (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 Credit 
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)  satisfaction of all conditions contained in SECTION 5.1; 

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

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

    (d)  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

    (e)  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

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 21
<PAGE>

    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 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.

         (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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 22
<PAGE>

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 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 

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 23
<PAGE>

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 
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.

                                 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:

AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 24
<PAGE>

    (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 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.


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 25
<PAGE>

    (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 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 


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 26
<PAGE>

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 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 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,


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 27
<PAGE>

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 Credit 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 Credit 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 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.


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 28
<PAGE>

    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 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 or former employees
that could have a Material Adverse 


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 29
<PAGE>

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
either 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 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 


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 30
<PAGE>

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 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.


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 31
<PAGE>


                                  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 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 Credit 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.

AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 32
<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.

    SECTION 9.6.   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 


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 33
<PAGE>

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 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 or the Term Loan.  Lender shall notify Borrower of any assignments or
participations by Lender of any of its interest in the Total Revolving
Commitment or the Term Loan.


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 34
<PAGE>

    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 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.

    SECTION 9.16.  AMENDMENT AND RESTATEMENT. This Credit Agreement amends and
restates, but does not extinguish or constitute a novation of, the Existing
Credit Agreement.   None of the execution, delivery, and performance of any
other documents executed in connection with this Credit Agreement, including but
not limited to execution of the Term Note, shall constitute a novation of any
indebtedness already existing, including, without limitation, that indebtedness
which is evidenced by the Revolving Note.

    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.


AMENDED AND RESTATED CREDIT AGREEMENT                                 Page 35


<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








AMENDED AND RESTATED CREDIT AGREEMENT                                  Page 36
<PAGE>

                                      EXHIBIT A


                               REQUEST FOR ADVANCE FORM


TO:      Bank One, Texas, N.A.
         1717 Main Street, 3rd Floor
         Dallas, Texas 75201
         Attention: Mark Wade

DATE:                        , 19
     ------------------------    ---

Ladies & Gentlemen:

    The undersigned ____________________, _________________ of IWL
COMMUNICATIONS, INC., a Texas corporation ("BORROWER"), hereby delivers this
certificate pursuant to that certain Amended and Restated Credit Agreement (the
"CREDIT AGREEMENT") dated August __, 1997, between Borrower and Bank One, Texas,
N.A. ("LENDER").  All terms defined in the Credit Agreement shall have the same
meaning herein. Borrower hereby requests a Advance in accordance with the Credit
Agreement.

    In connection with the foregoing and pursuant to the terms and provisions
of the Credit Agreement, the undersigned hereby certifies that to the best of
his or her knowledge:

       (a)    The representations and warranties contained in the Credit
    Agreement and the other Loan Documents are true and correct in all material
    respects with the same force and effect on and as of the date hereof as
    though made on the date hereof.

       (b)    Immediately before and after giving effect to the Advance
    requested herein, no Default has occurred and is continuing and the making
    of such Advance shall not cause a Default.

       (c)    The amount of the Advance made or to be made pursuant to this
    request does not exceed the difference between (i) the lesser of (1) Total
    Revolving Commitment and (2) the Borrowing Base, minus (ii) the total
    outstanding amount of the Advances.

       (d)    All information supplied below is true, correct, and complete as
    of the date hereof.




                             ADVANCE REQUEST INFORMATION


EXHIBIT A TO AMENDED AND RESTATED CREDIT AGREEMENT (REQUEST FOR ADVANCE)  Page 1
<PAGE>

    (1)  Total Revolving Commitment
         ("TRC") $5,000,000.00

    (2)  Aggregate Outstanding principal
         amount of Advances ("LOANS")  $             
                                         ----------

    (3)  Borrowing Base ("BB")         $             
                                         ----------

    (4)  Lesser of TRC and BB          $             
                                         ----------

    (5)  Net availability of credit:
         [(4) - (Loans)]               $             
                                         ----------

    (6)  Amount of Advance requested   $             
                                         ----------

    (7)  Date of requested Advance                 , 19
                                   ----------------    ---


                             BORROWER:

                             IWL COMMUNICATIONS, INC.

                             By:                                                
                                 --------------------------------------
                             Name:                                              
                                 --------------------------------------
                             Title:                                             
                                 --------------------------------------






EXHIBIT A TO AMENDED AND RESTATED CREDIT AGREEMENT (REQUEST FOR ADVANCE)  Page 2
<PAGE>


                                  EXHIBIT B



              BORROWING BASE REPORT AND COMPLIANCE CERTIFICATE


     The undersigned hereby certifies that he/she is the duly elected Chief
Financial Officer of IWL COMMUNICATIONS, INC., a Texas corporation ("BORROWER") 
and that he/she is authorized to execute this Certificate on behalf of Borrower
in connection with that certain Amended and Restated Credit Agreement, dated as
of August __, 1997, (as amended from time to time, the "CREDIT AGREEMENT"),
between Borrower and Lender.  All terms used but not defined herein shall have
the meanings set forth in the Credit Agreement.  This Certificate is submitted
on a monthly basis on the thirtieth (30th) day of each month for the period
ended _________________, 199__.  The undersigned hereby further certifies to the
following as of the date set forth below:

     1.   The representations and warranties of Borrower under the Credit
Agreement are true and complete in all material respects, before and after
giving effect to all Advances.

     2.   No event has occurred which constitutes a default.

     3.   The outstanding principal amount under the Total Revolving Commitment
(giving effect to any Advances being borrowed as of the date hereof) as of the
date hereof is $____________.  
                    
     4.   The Borrowing Base as of the date hereof is $_____________.  The
Borrowing Base is determined as follows:


      (a)  Total Accounts of Borrower, per the
           attached Accounts Receivable Report    $
                                                    ----------------
      (b)  All Accounts of Borrower that have
           been due and payable for 91 days or
           more from invoice date, per the
           attached Accounts Receivable Report    $
                                                    ----------------
      (c)  All other Accounts of Borrower that
           do not constitute Eligible Accounts    $
                                                    ----------------
      (d)  Eligible Accounts of Borrower (Item
           (a) minus Items (b) and (c))           $
                                                    ----------------
      (e)  Eligible Inventory, per the attached
           Inventory Report                       $
                                                    ----------------
      (f)  80% of Item (d)                        $
                                                    ----------------
      (g)  50% of (e)                             $
                                                    ----------------
           Borrowing Base (sum of Items (f) and
           (g))                                   $
                                                    ----------------
                                                    ----------------


EXHIBIT B TO AMENDED AND RESTATED CREDIT AGREEMENT:
BORROWING BASE CERTIFICATE      
<PAGE>


     5.   As of __________________, 19___ (being the last day of Borrower's most
recently ended fiscal quarter) Borrower is in compliance with the financial
covenants contained in SECTION 7.2 of the Credit Agreement.

     6.   I hereby certify, in my capacity as the Chief Financial Officer of IWL
Communications, Inc., that the information set forth herein and on the
attachments hereto is true and correct in all material respects to the best of
my knowledge and prepared in accordance with GAAP.


     IN WITNESS WHEREOF, I have executed this Certificate as of the ______ day
of _________________, 19___.


                              IWL COMMUNICATIONS, INC.


                              By:                                      
                                  -----------------------------------
                                  Print Name:                         
                                             ------------------------
                                  Print Title:                        
                                             ------------------------








EXHIBIT B TO AMENDED AND RESTATED CREDIT AGREEMENT:
BORROWING BASE CERTIFICATE      
<PAGE>

                                      EXHIBIT C



                                COMPLIANCE CERTIFICATE


     The undersigned hereby certifies that he/she is the duly elected Chief
Financial Officer of IWL COMMUNICATIONS, INC., a Texas corporation ("BORROWER") 
and that he/she is authorized to execute this Certificate on behalf of Borrower
in connection with that certain Amended and Restated Credit Agreement, dated as
of August __, 1997, (as amended from time to time, the "CREDIT AGREEMENT"),
between Borrower and Lender.  All terms used but not defined herein shall have
the meanings set forth in the Credit Agreement.  This Certificate is submitted
on a monthly basis on the thirtieth (30th) day of each month for the period
ended _________________, 199__.  The undersigned hereby further certifies to the
following as of the date set forth below:

     1.   The representations and warranties of Borrower under the Credit
Agreement are true and complete in all material respects, before and after
giving effect to any Advances or Letters of Credit.

     2.   No event has occurred which constitutes a Default or Event of Default.

     3.   As of __________________, 19___ (being the last day of the most recent
calendar quarter) Borrower is in compliance with the financial covenants
contained in SECTION 7.2  of the Credit Agreement and the following information
is true, accurate and complete as of such date:

     (a)  Borrower's Tangible Net Worth is $___________;

     (b)  The Debt to Worth Ratio for the immediately preceding four (4)
          consecutive fiscal quarters is _____________ to 1.00; and

          In calculating the foregoing Debt to Worth Ratio, I have determined
     the following for the four (4) consecutive fiscal quarters immediately
     preceding _________________, 19____ (being the last day of Borrower's most
     recently ended fiscal quarter) in accordance with the provisions of the
     Credit Agreement, Borrower's aggregate Debt was $_________.

     (c)  The Fixed Charge Ratio for the immediately preceding four (4)
          consecutive fiscal quarters is _____________ to 1.00; and

          In calculating the foregoing Fixed Charge Ratio, I have determined the
     following for the four (4) consecutive fiscal quarters immediately
     preceding _________________, 19____ (being the last day of Borrower's most
     recently ended fiscal quarter) in accordance with the provisions of the
     Credit Agreement:


             (i)    Borrower's aggregate Interest Expense was
                    $__________________;

EXHIBIT C TO AMENDED AND RESTATED CREDIT AGREEMENT:
(COMPLIANCE CERTIFICATE)                                                 Page 1
<PAGE>

            (ii)    Borrower's aggregate Lease Expense was $__________________;
                    and

           (iii)    Borrower's aggregate EBITDA was $________________.


     (b)  The Current Ratio is _____________ to 1.00.

          In calculating the foregoing Current Ratio, I have determined the
     following as of _________________, 19____ (being the last day of Borrower's
     most recently ended fiscal quarter) in accordance with the provisions of
     the Credit Agreement:

             (i)    The aggregate amount of all current assets required to be
                    shown as such on the balance sheet of Borrower prepared in
                    accordance with GAAP was $__________________; and

            (ii)    The aggregate amount of all current liabilities required to
                    be shown as such on the balance sheet of Borrower prepared
                    in accordance with GAAP was $__________________. 

     6.   I hereby certify, in my capacity as the Chief Financial Officer of IWL
Communications, Inc., that the information set forth herein and on the
attachments hereto is true and correct in all material respects to the best of
my knowledge and prepared in accordance with GAAP.


     IN WITNESS WHEREOF, I have executed this Certificate as of the ______ day
of _________________, 19___.



                              IWL COMMUNICATIONS, INC.


                              By:                                     
                                 -------------------------------------
                                   Print Name:                        
                                              ------------------------
                                   Print Title:                       
                                               -----------------------




EXHIBIT C TO AMENDED AND RESTATED CREDIT AGREEMENT:
(COMPLIANCE CERTIFICATE)                                                 Page 2