BANK ONE.
1717 Main
Dallas, TX  75201


                                    LOAN AGREEMENT
BANKONE
                                    June 26, 1996

Interphase Corporation
13800 Senlac
Dallas, Texas 75234-8823

Gentlemen:

    This Loan Agreement (the "LOAN AGREEMENT") will serve to set forth the
terms of the financing transactions by and between INTERPHASE CORPORATION
("BORROWER"), and BANK ONE, TEXAS, NATIONAL ASSOCIATION ("BANK"):

         1.   CREDIT Facilities.  Subject to the terms and conditions set 
forth in this Loan Agreement and the other agreements, instruments and 
documents evidencing, securing, governing, guaranteeing and/or pertaining to 
the Loans, as hereinafter defined (collectively, together with the Loan 
Agreement, referred to hereinafter as the "LOAN DOCUMENTS"), Bank hereby 
agrees to provide to Borrower the credit facility or facilities herein below 
(whether one or more, the "CREDIT FACILITIES"):

         (a)  LINE OF CREDIT.  Subject to the terms and conditions set forth
    herein, Bank agrees to lend to Borrower, on a revolving basis from time to
    time during the period commencing on the date hereof and continuing through
    the maturity date of the promissory note evidencing this Credit Facility
    from time to time, such amounts as Borrower may request hereunder (the
    "LINE OF CREDIT"); PROVIDED, HOWEVER, the total principal amount
    outstanding at any time shall not exceed (1) the lesser of (i) an amount
    equal to the Borrowing Base (as such term is defined herein below), or (ii)
    $5,000,000.00 (the "COMMITTED Sum"), less (2) the amount of the outstanding
    Letter of Credit Liabilities (as defined below).  If at any time the sum of
    the aggregate principal amount outstanding under the Line of Credit, plus
    the amount of the outstanding Letter of Credit Liabilities shall exceed an
    amount equal to the Borrowing Base, Borrower agrees to promptly repay to
    Bank such excess amount, plus all accrued but unpaid interest thereon.
    Subject to the terms and conditions hereof, Borrower may borrow, repay and
    re-borrow hereunder.  The sums advanced under the Line of Credit shall be
    used for short-term working capital needs and acquisitions of other
    entities.


LOAN AGREEMENT - Page 1



    As used in this Loan Agreement, the term "BORROWING BASE" shall mean an
    amount equal to 80% of the Borrower's Eligible Accounts (as hereinafter
    defined), @us 90% of the Borrower's Eligible Securities (as hereinafter
    defined), LESS the aggregate principal amount outstanding under the
    Acquisition Facility.

    As used herein, the term "ELIGIBLE Accounts" shall mean at any time, an
    amount equal to the aggregate net invoice or ledger amount owing on all
    trade accounts receivable of Borrower for goods sold or leased or services
    rendered in the ordinary course of business, in which the Bank has a
    perfected, first priority lien, after deducting (without duplication): (i)
    each such account that is unpaid 91 days or more after the original invoice
    date thereof, (ii) the amount of all discounts, allowances, rebates,
    credits and adjustments to such accounts (iii) the amount of all contra
    accounts, setoffs, defenses or counterclaims asserted by or available to
    the account debtors, (iv) all accounts with respect to which goods are
    placed on consignment or subject to a guaranteed sale or other terms by
    reason of which payment by the account debtor may be conditional, (v) all
    accounts with respect to which Borrower has furnished a payment and/or
    performance bond and that portion of any accounts for or representing
    retainage, if any, until all prerequisites to the immediate payment of
    retainage have been satisfied, (vi) all accounts owing by account debtors
    for which there has been instituted a proceeding in bankruptcy or
    reorganization under the United States Bankruptcy Code or other law,
    whether state or federal, now or hereafter existing for relief of debtors,
    (vii) all accounts owing by any affiliates of Borrower, (viii) all accounts
    in which the account debtor is the United States or any department, agency
    or instrumentality of the United States, except to the extent an
    acknowledgment of assignment to Bank of such account in compliance with the
    Federal Assignment of Claims Act and other applicable laws has been
    received by Bank, (ix) all accounts due Borrower by any account debtor
    whose principal place of business is located outside the United States of
    America and its territories unless such account is supported by an
    irrevocable letter of credit in form and substance satisfactory to Bank
    issued by a domestic commercial bank acceptable to Bank or supported by
    export insurance acceptable to Bank, (x) all accounts subject to any
    provision prohibiting assignment or requiring notice of or consent to such
    assignment (unless such consent or notice is provided to Bank in a form
    reasonably satisfactory to Bank), and (xi) that portion of all account
    balances owing by any single account debtor which exceeds 25% of the
    aggregate of all accounts otherwise deemed eligible hereunder which are
    owing to Borrower by all account debtors; provided, however, if more than
    10% of the then balance owing by any single account debtor does not qualify
    as an Eligible Account under the foregoing provisions, then the aggregate
    amount of all accounts owing by such account debtor shall be excluded from
    Eligible Accounts.

    As used herein, the term "ELIGIBLE SECURITIES" shall mean as of any date,
    the Market Value of all securities in the Account (as defined below) which
    are U.S. treasury securities, U.S. governmental agency securities,
    corporate bonds rated AA or better and any Banc One Securities Corporation
    money market funds.  The term "MARKET


LOAN AGREEMENT - Page 2



    VALUE" shall mean the current fair market value of the securities in the
    Account quoted to Bank by its most readily available source

         (b)  ACQUISITION FACILITY.  Subject to the terms and conditions set
    forth herein, Bank agrees to lend to Borrower, on a non-revolving basis
    from time to time during the period commencing on the date hereof and
    continuing through the first year anniversary of this Loan Agreement, an
    aggregate amount not to exceed $8,500,000.00 in a single loan or in
    multiple loans, as may be requested by Borrower (the "ACQUISITION
    FACILITY"); provided, HOWEVER, the total principal outstanding at any time
    shall not exceed (1) the lesser of (i) an amount equal to the Acquisition
    Borrowing Base (as such term is hereinafter defined below), or (ii)
    $8,500,000.00, less (2) the amount of the outstanding Letter of Credit
    Liabilities (as defined below).  If at any time the sum of the aggregate
    principal outstanding under the Acquisition Facility plus the amount of the
    Letter of Credit Liabilities shall exceed an amount equal to the
    Acquisition Borrowing Base, Borrower agrees to promptly repay to Bank such
    excess amount, plus all accrued but unpaid interest thereon.  Borrower
    shall not be allowed to re-borrow under the Acquisition Facility after a
    repayment.  All sums advanced under the Acquisition Facility shall be used
    to provide funds for permanent working capital needs and corporate
    acquisitions.  Prior to or contemporaneously with each loan under the
    Acquisition Facility, Borrower agrees to execute a promissory note
    ("ACQUISITION NOTE") payable by Borrower to order of Bank in the stated
    principal amount equal to such loan, in form and substance acceptable to
    Bank.  Interest on each Acquisition Note shall accrue at the lower of the
    maximum rate allowed by law or the Contract Rate.  The term "CONTRACT
    Rate", as used herein, shall mean either (i) a fluctuating rate of interest
    (the "FLUCTUATING RATE") established by Bank from time to time as its Base
    Rate of interest (which may not be the lowest, best or most favorable rate
    of interest which Bank may charge on loans to its customers), or (ii) a
    fixed rate of interest (the "FIXED RATE") quoted by Bank to Borrower at the
    time of the request for the subject loan.  The Borrower has the option to
    select either the Floating Rate or Fixed Rate for each loan under the
    Acquisition Facility; provided, however, in the event Borrower initially
    selects the Floating Rate for an Acquisition Note, on the first year
    anniversary of such Acquisition Note the Borrower may notify the Bank of
    its desire to have a fixed rate for the remaining term of the Acquisition
    Note.  Any such fixed rate would be equal to the rate quoted to Borrower by
    Bank at such time.  During the first one hundred twenty (120) days of each
    Acquisition Note, interest shall be due and payable quarterly.  Each
    Acquisition Note shall have equal quarterly payments of principal, plus
    accrued but unpaid interest, such payments to commence on the fifth month
    anniversary of each Acquisition Note and continue every three months
    thereafter during the term of such note.  The amount of each quarterly
    principal payment shall be based on fully amortizing each Acquisition Note
    with twenty equal quarterly payments; provided, however, each Acquisition
    Note shall mature on April 30, 1998.  As used in this Loan Agreement, the
    term "ACQUISITION BORROWING Base" shall mean


LOAN AGREEMENT - Page 3



    an amount equal to 80% of Borrower's Eligible Accounts, and 90% of
    Borrower's Eligible Securities LESS the aggregate principal amount
    outstanding under the Line of Credit.

         (c)  EQUIPMENT FACILITY.  Subject to the terms and conditions set
    forth herein, Bank agrees to lend to Borrower, on a non-revolving basis
    from time to time during the period commencing on the date hereof and
    continuing through the first year anniversary of this Loan Agreement, an
    aggregate amount not to exceed $2,500,000.00 in a single loan or in
    multiple loans, as may be requested by Borrower (the "EQUIPMENT FACILITY").
    Borrower shall not be allowed to re-borrow under the Equipment Facility
    after a repayment.  All sums advanced under the Equipment Facility shall be
    used to provide funds for equipment purchases.  Prior to or
    contemporaneously with each loan under the Equipment Facility, Borrower
    agrees to execute a promissory note ("EQUIPMENT NOTE") payable by Borrower
    to order of Bank in the stated principal amount equal to such loan, in form
    and substance acceptable to Bank.  Interest on each Equipment Note shall
    accrue at the lower of the maximum rate allowed by law or the Contract
    Rate.  The Borrower has the option to select either the Floating Rate or
    Fixed Rate for each loan under the Equipment Facility; provided, however,
    in the event Borrower initially selects the Floating Rate for an Equipment
    Note, on the first year anniversary of such Equipment Note the Borrower may
    notify the Bank of its desire to have a fixed rate for the remaining term
    of the Equipment Note.  Any such fixed rate would be the rate quoted to
    Borrower by Bank at such time.  During the first one hundred twenty (120).
    days of each Equipment Note, interest shall be due and payable quarterly.
    Each Equipment Note shall have equal quarterly payments of principal, plus
    accrued but unpaid interest, such payments to commence on the fifth month
    anniversary of each Equipment Note and continue every three months
    thereafter during the term of such note.  The amount of each quarterly
    principal payment shall be based on fully amortizing each Equipment Note
    with twenty equal quarterly payments; provided, however, each Equipment
    Note shall mature on April 30, 1999.

All advances and loans under the Credit Facilities shall be collectively called
the "Loans".  Bank reserves the right to require Borrower to give Bank not less
than-one (1) business day prior notice of each requested advance under the
Credit Facilities, specifying (i) the aggregate amount of such requested
advance, (ii) the requested date of such advance, and (iii) the purpose for such
advance, with such advances to be requested in a form satisfactory to Bank.

    2.   PROMISSORY NOTES.  The Loans shall be evidenced by one or more
promissory notes (whether one or more, together with any renewals, extensions
and increases thereof, the "Notes") duly executed by Borrower and payable to the
order of Bank, in form and substance acceptable to Bank.  Interest on the Notes
shall accrue at the rate set forth therein.  The principal of and interest on
the Notes shall be due and payable in accordance with the terms and conditions
set forth in the Notes and in this Loan Agreement.


LOAN AGREEMENT - Page 4



3.  LETTERS OF CREDIT.

         (a)  ISSUANCE OF LETTERS OF Credit.  Subject to the terms and
    conditions of this Loan Agreement, Bank agrees to issue one or more letters
    of credit (collectively, the "LETTERS OF Credit") for the account of
    Borrower from time to time from the date hereof to and including the
    maturity date of the Note evidencing the Line of Credit; provided however,
    that the Bank's outstanding commitments under all outstanding Letters of
    Credit (the "LETTER OF CREDIT LIABILITIES ") shall not at any time exceed
    the lesser of $500,000.00 or an amount equal to the Available Funds.  As
    used herein, the "AVAILABLE Funds" shall be equal to an amount which is the
    lesser of (i)- an amount equal to the Committed Sum, or (ii) an amount
    equal to the Borrowing Base, LESS the aggregate principal amount
    outstanding under the Line of Credit.  All Letters of Credit shall have an
    expiration date of on or prior to the 120th day after the maturity date of
    the Note evidencing the Line of Credit, must support a transaction that is
    entered into in the ordinary course of business, must otherwise be
    satisfactory in form and substance to Bank, and shall be issued pursuant to
    such documents and instruments, including, without limitation, Bank's
    standard application and agreement for issuance of letters of credit, as
    then in effect ("LETTER OF CREDIT A1212lication") as Bank may require.  No
    Letter of Credit shall require any payment by Bank to the beneficiary
    thereunder pursuant to a drawing prior to the third business day following
    presentment of a draft and any related documents to Bank.  Each Letter of
    Credit shall be issued on at least three (3) business days prior notice
    from Borrower to Bank.

         (b)  REPAYMENT.  Each payment by Bank pursuant to a drawing under a
    Letter of Credit must be repaid to Bank promptly by Borrower in accordance
    with the terms of the subject Letter of C.-edit Application.

         (c)  Fee.  Borrower shall pay to Bank a letter of credit fee payable
    on the date each Letter of Credit is issued in an amount equal to one and
    six tenths percent (1.6%) per annum of the stated amount of such Letter of
    Credit, for the stated term of such Letter of Credit, based on a 360 day
    year and the actual number of days elapsed.

    4.   COLLATERAL. As collateral and security for the indebtedness evidenced
by the Notes and any and all other indebtedness or obligations from time to time
owing by Borrower to Bank, Borrower shall grant, and hereby grants, to Bank, its
successors and assigns, a first and prior lien and security interest in and to
the property described herein below, together with any and all PRODUCTS AND
PROCEEDS thereof (the "COLLATERAL"):

         (a)  All present and future accounts, chattel paper and general
    intangibles (including any right to payment for goods sold or services
    rendered arising out of the sale or delivery of personal property or work
    done or labor performed by Borrower), now or hereafter owned, held, or
    acquired by Borrower, together with any and all


LOAN AGREEMENT - Page 5



    books of account, customer lists and other records relating in any way to
    the foregoing.

         (b)  All present and hereafter acquired inventory (including without
    limitation, all raw materials, work in process and finished goods) held,
    possessed, owned, held on consignment, or held for sale, lease, return or
    to be furnished under contracts of service, in whole or in part, by
    Borrower wherever located.

         (c)  All equipment of whatsoever kind and character now or hereafter
    possessed, held, acquired, leased or owned by Borrower and used or usable
    in Borrower's business, together with all replacements, accessories,-
    additions, substitutions and accessions to all of the foregoing.

         (d)  Account No. 8334002410 in the name of Borrower and maintained
    with Banc One Investment Advisors Corporation, and all securities, cash and
    other property now or hereafter contained in such account (the "Account").

The term "Collateral" shall also include all records and data relating to any of
the foregoing (including, without limitation, any computer software on which
such records and data may be located).  Borrower agrees to execute such security
agreements, assignments, deeds of trust and other agreements and documents as
Bank shall deem appropriate and otherwise require from time to time to more
fully create and perfect Bank's lien and security interests in the Collateral.

    5.   REPRESENTATIONS AND Warranties.  Borrower hereby represents and
warrants, and upon each request for an advance under the Credit Facilities
further represents and warrants, to Bank as follows:

         (a)  EXISTENCE.  Borrower is a corporation duly organized, validly
    existing and in good     standing under the laws of the State of Texas and
    all other states where it is doing business, and has all requisite power
    and authority to execute and deliver the Loan Documents.

         (b)  BINDING OBLIGATIONS.  The execution, delivery, and performance of
    this Loan Agreement and all of the other Loan Documents by Borrower have
    been duly authorized by all necessary action by Borrower, and constitute
    legal, valid and binding obligations of Borrower, enforceable in accordance
    with their respective terms, except as limited by bankruptcy, insolvency or
    similar laws of general application relating to the enforcement of
    creditors' rights and except to the extent specific remedies may generally
    be limited by equitable principles.

         (c)  NO CONSENT.  The execution, delivery and performance of this Loan
    Agreement and the other Loan Documents, and the consummation of the
    transactions contemplated hereby and thereby, do not (i) conflict with,
    result in a violation of, or constitute a default under (A) any provision
    of its Articles of


LOAN AGREEMENT - Page 6



    Incorporation or Bylaws, or any agreement or other instrument binding upon
    Borrower, or (B) any law, governmental regulation, court decree or order
    applicable to Borrower, or (ii) require the consent, approval or
    authorization of any third party.

         (d)  FINANCIAL Condition.  Each financial statement of Borrower
    supplied to Bank truly discloses and fairly presents Borrower's financial
    condition as of the date of each such statement.  There has been no
    material adverse change in such financial condition or results of
    operations of Borrower subsequent to the date of the most recent financial
    statement supplied to Bank.

         (e)  LITIGATION.  Except as previously disclosed to Bank, there are no
    actions, suits or proceedings, pending or, to the knowledge of Borrower,
    threatened against or affecting Borrower or the properties of Borrower,
    before any court or governmental department, commission or board, which, if
    determined adversely to Borrower, would have a material adverse effect on
    the financial condition, properties, or operations of Borrower.

         (f)  TAXES-, GOVERNMENTAL CHARGES.  Borrower has filed all federal,
    state and local tax reports and returns required by any law or regulation
    to be filed by it and has either duly paid all taxes, duties and charges
    indicated due on the basis of such returns and reports, or made adequate
    provision for the payment thereof, and the assessment of any material
    amount of additional taxes in excess of those paid and reported is not
    reasonably expected.

    6.   CONDITIONS PRECEDENT TO ADVANCES.  Bank's obligation to make any
advance or issue any Letter of Credit under this Loan Agreement and the other
Loan Documents shall be subject to the conditions precedent that, as of the date
of such advance and after giving effect thereto (i) all representations and
warranties made to Bank in this Loan Agreement and the other Loan Documents
shall be true and correct in all material respects, as of and as if made on such
date, (ii) no material adverse change in the financial condition of Borrower
since the effective date of the most recent financial statements furnished to
Bank by Borrower shall have occur-red and be continuing, (iii) no event has
occurred and is continuing, or would result from the requested advance, which
with notice or lapse of time, or both, would constitute an Event of Default (as
hereinafter defined), and (iv) Bank's receipt of all Loan Documents
appropriately executed by Borrower and all other proper parties.

    7.   AFFIRMATIVE COVENANTS.  Until (i) the Notes and all other obligations
and liabilities of Borrower under this Loan Agreement and the other Loan
Documents are fully paid and satisfied, and (ii) Bank has no further commitment
to lend or issue Letters of Credit hereunder, Borrower agrees and covenants that
it will, unless Bank shall otherwise consent in writing:

         (a)  ACCOUNTS AND RECORDS.  Maintain its books and records in
    accordance with generally accepted accounting principles.


LOAN AGREEMENT - Page 7



         (b)  RIGHT OF INSPECTION.  Permit Bank to visit its properties and
    installations and to examine, audit and make and take away copies or
    reproductions of Borrower's books and records, at all reasonable times upon
    one (1) business days prior notice.

         (c)  RIGHT TO ADDITIONAL INFORMATION.  Furnish Bank with such
    additional information and statements, lists of assets and liabilities, tax
    returns, and other reports with respect to Borrower's financial condition
    and business operations as Bank may reasonably request from time to time.

         (d)  COMPLIANCE WITH LAWS.  Conduct its business in an orderly and
    efficient manner consistent with good business practices, and perform and
    comply with all statutes, rules, regulations and/or ordinances imposed by
    any governmental unit upon Borrower, its businesses, operations and
    properties (including without limitation, all applicable environmental
    statutes, rules, regulations and ordinances).

         (e)  TAXES.  Pay and discharge when due all of its indebtedness and
    obligations, including without limitation, all assessments, taxes,
    governmental charges, levies and liens, of every kind and nature, imposed
    upon Borrower or its properties, income, or profits, prior to the date on
    which penalties would attach, and all lawful claims that, if unpaid, might
    become a lien or charge upon any of Borrower's properties, income, or
    profits; provided, however, Borrower will not be required to pay and
    discharge any such assessment, tax, charge, levy, hen or claim so long as
    (i) the legality of the same shall be contested in good faith by
    appropriate judicial, administrative or other legal proceedings, and (ii)
    Borrower shall have established on its books adequate reserves with respect
    to such contested assessment, tax, charge, levy, lien or claim in
    accordance with generally accepted accounting principles, consistently
    applied.

         (f)  INSURANCE.  Maintain insurance, including but not limited to,
    fire insurance, comprehensive property damage, public liability, worker's
    compensation, business interruption and other insurance deemed necessary or
    otherwise required by Bank.

         (g)  NOTICE OF INDEBTEDNESS.  Promptly inform Bank of the creation,
    incurrence or assumption by Borrower of any actual or contingent
    liabilities not permitted under this Loan Agreement.

         (h)  NOTICE OF LITIGATION.  Promptly after the commencement thereof,
    notify Bank of all actions, suits and proceedings before any court or any
    governmental department, commission or board affecting Borrower or any of
    its properties.

         (i)  NOTICE OF MATERIAL ADVERSE CHANGE.  Promptly inform Bank of (i)
    any and all material adverse changes in Borrower's financial condition, and
    (ii) all claims made against Borrower which could materially affect the
    financial condition of Borrower.


LOAN AGREEMENT - Page 8



ADDITIONAL DOCUMENTATION.  Execute and deliver, or cause to be executed and
delivered, any and all other agreements, instruments or documents which Bank may
reasonably request in order to give effect to the transactions contemplated
under this Loan Agreement and the other Loan Documents.

    8.   NEGATIVE Covenants.  Until (i) the Notes and all other obligations and
liabilities of Borrower under this Loan Agreement and the other Loan Documents
are fully paid and satisfied, and (ii) Bank has no further commitment to lend or
issue Letters of Credit hereunder, Borrower will not, without the prior written
consent of Bank:

         (a)  NATURE OF Business.  Make any material change in the nature of
    its business as carried on as of the date hereof.

         (b)  LIQUIDATIONS, MERGERS, CONSOLIDATIONS.  Liquidate, merge or
    consolidate with or into any other entity, unless Borrower is the surviving
    entity subject to the terms of Subparagraph 8(h) below.

         (c)  SALE OF ASSETS.  Sell, transfer or otherwise dispose of any of
    its assets or properties, other than in the ordinary course of business.

         (d)  Liens.  Create or incur any lien or encumbrance on any of its
    assets, other than (i) liens and security interests securing indebtedness
    owing to Bank, (ii) liens for taxes, assessments or similar charges either
    (1) not yet due or (2) being contested in good faith by appropriate
    proceedings and for which Borrower has established adequate reserves, (iii)
    liens and security interest existing as of the date hereof which have been
    disclosed to and approved by the Bank in writing and (iv) liens which
    secure purchase money indebtedness in an amount not to exceed the aggregate
    amount of $250,000.00.

         (e)  INDEBTEDNESS.  Create, incur or assume any indebtedness for
    borrowed money or issue or assume any other note, debenture, bond or other
    evidences of indebtedness, or guarantee any such indebtedness or such
    evidences of indebtedness of others, other than (i) borrowings from Bank,
    (ii) borrowings outstanding on the date hereof and disclosed in writing to
    Bank, (iii) borrowings created after the date hereof which are subordinate
    to the borrowings from Bank and (iv) purchase money indebtedness in an
    amount not to exceed the aggregate amount of $250,000.00.

         (f)  Loans.  Make any loans to any person or entity in excess of
    $250,000 in the aggregate; and provided, Borrower shall be permitted to
    make extensions of trade credit in the ordinary course of business.

         (g)  TRANSACTIONS WITH AFFILIATES.  Enter into any transaction,
    including, without limitation, the purchase, sale or exchange of property
    or the rendering of any service, with any Affiliate (as hereinafter
    defined) of Borrower, except in the ordinary course of and pursuant to the
    reasonable requirements of Borrower's business and


    LOAN AGREEMENT - Page 9



    upon fair and reasonable terms no less favorable to Borrower than would be
    obtained in a comparable arm's-length transaction with a person or entity
    not an Affiliate of Borrower.  As used herein, the term "Affiliate" means
    any individual or entity directly or indirectly controlling, controlled by,
    or under common control with, another individual or entity.

         (h)  ACQUISITIONS.  Invest in, or purchase, create, form or acquire
    any interest in, any other entity; provided, however, (1) Borrower may
    acquire an entity with an acquisition price of less than $5,000,000.00
    without Bank's prior written approval as long as the earnings before
    interest, taxes, depreciation and amortization (as determined in accordance
    with generally accepted accounting principles) of the acquired entity
    during its then most recent annual reporting period and during its then
    most recent interim reporting period is for each period more than $0, and
    (2) Borrower may acquire an entity with an acquisition price of greater
    than $5,000,000.00 but less than $10,000,000.00 without the Bank's prior
    written consent if (i) the Market Value of Borrower's Eligible Securities
    at such time is equal to or greater than all of the outstanding
    indebtedness owing to Bank (including the outstanding Letter of Credit
    Liabilities) at such time, and (ii) the earnings before interest, taxes,
    depreciation and amortization (determined in accordance with generally
    accepted accounting principles) of the acquired entity during its then most
    recent annual reporting period and du-ring its then most recent interim
    reporting period is for each period more than $0.

    9.   FINANCIAL COVENANTS.  Until (i) the Notes and all other obligations
and liabilities of Borrower under this Loan Agreement and the other Loan
Documents are fully paid and satisfied, and (ii) Bank has no further commitment
to lend or issue Letters Of Credit hereunder, Borrower will, unless Bank shall
otherwise consent in writing, maintain the following financial covenants:

         (a)  TANGIBLE NET Worth.  Borrower will maintain its Tangible Net
    Worth at not less than $ 23,500,000 at the end of each fiscal quarter
    during fiscal year 1996.  At the end of 'each fiscal quarter during each
    fiscal year thereafter, Borrower's Tangible Net Worth shall equal or exceed
    the minimum Tangible Net Worth required to be maintained by Borrower during
    the immediately prior fiscal year, @us 70% of the after tax net income of
    Borrower in the immediately prior fiscal year as stated on Borrower's
    annual, audited financial statements.

         (b)  LIABILITIES TANGIBLE NET WORTH.  Borrower will maintain, at all
    times, a ratio of (a) total liabilities (excluding any Subordinated Debt,
    as hereinafter defined), to (b) Tangible Net Worth of not greater than 1.0
    to 1.0.

         (c)  DEBT SERVICE.  Borrower will maintain, as of the last day of each
    fiscal quarter, a ratio of (a) net income after taxes less capital
    expenditures un-funded with financing from Bank PLUS depreciation,
    amortization and other non-cash expenses for the 12 month period ending
    with such fiscal quarter to (b) current maturities of


LOAN AGREEMENT - Page 10



    long-term debt and long-term leases for such 12 month period, of not less
    than 1.0 to 1.0.

         (d)  INTEREST COVERAGE.  Borrower will maintain, as of the end of each
    fiscal quarter, a ratio of (a) earnings before interest and taxes
    (excluding interest income) for the 12 month period ending with such fiscal
    quarter, to (b) interest expense for such 12 month period, of not less than
    1.0 to I.O.

         (e)  QUICK RATIO.  Borrower will maintain, at all times, a ratio of
    (a) Borrower's current assets, less inventory, to (b) current liabilities,
    in excess of 1.0 to 1.0.

As used herein, the term "TANGIBLE NET Worth" means, as of any date, Borrower's
total assets excluding all intangible assets, less total liabilities excluding
any Subordinated Debt.  As used herein, the term "SUBORDINATED DEBT" means any
indebtedness owing by Borrower which has been subordinated by written agreement
to all indebtedness now or hereafter owing by Borrower to Lender, such agreement
to be in form and substance acceptable to Lender.  Unless otherwise specified,
all accounting and financial terms and covenants set forth above are to be
determined according to generally accepted accounting principles, consistently
applied.

    10.  REPORTING Requirements.  Until (i) the Notes and all other obligations
and liabilities of Borrower under this Loan Agreement and the other Loan
Documents are fully paid and satisfied, and (ii) Bank has no further commitment
to lend or issue Letters of Credit hereunder, Borrower will, unless Bank shall
otherwise consent in writing, furnish to Bank:

         (a)  INTERIM FINANCIAL STATEMENTS.  As soon as available, and in any
    event within forty-five (45) days after the end of each quarter of each
    fiscal year of Borrower, a balance sheet and income statement of Borrower
    as of the end of such fiscal quarter, all in form and substance and in
    reasonable detail satisfactory to Bank and duly certified (subject to year-
    end review adjustments) by the President and/or Chief Financial Officer of
    Borrower (i) as being true and correct in all material aspects to the best
    of his or her knowledge and (ii) as having been prepared in accordance with
    generally accepted accounting principles, consistently applied.

         (b)  ANNUAL FINANCIAL STATEMENTS.  As soon as available and in any
    event within one hundred twenty (120) days after the end of each fiscal
    year of Borrower, a balance sheet and income statement of Borrower as of
    the end of such fiscal year, in each case audited by independent public
    accountants of recognized standing acceptable to Bank.

         (c)  COMPLIANCE CERTIFICATE.  A certificate signed by President or
    Chief Financial Officer of Borrower, within forty-five (45) days after the
    end of the first three quarters of each fiscal year and within one hundred
    twenty (120) days of the


LOAN AGREEMENT - Page 11



    end of the fourth quarter of each fiscal year, stating that Borrower is in
    full compliance with all of its obligations under this Loan Agreement and
    all other Loan Documents and is not in default of any term or provisions
    hereof or thereof, and demonstrating compliance with all financial ratios
    and covenants set forth in this Loan Agreement.

         (d)  BORROWING BASE REPORT.  A borrowing base report signed by the
    President or Chief Financial Officer of Borrower, within forty-five (45)
    days after the end of each quarter of each fiscal year, in form and detail
    satisfactory to Bank.

    11.  EVENTS OF DEFAULT.  Each of the following shall constitute an "Event
of Default" under this Loan Agreement:

         (a)  The failure, refusal or neglect of Borrower to pay within five
    (5) days of when due any part of the principal of, or interest on, the
    Notes or any other indebtedness or obligations owing to Bank by Borrower
    from time to time.

         (b)  The failure of Borrower or any Obligated Party (as defined below)
    to timely and properly observe, keep or perform any covenant, agreement,
    warranty or condition required herein or in any of the other Loan Documents
    and such failure continues for a period of thirty (30) days after receipt
    of written notice thereof from Bank to Borrower.

         (c)  Subject to any applicable notice and cure period, the occurrence
    of an event of default under any of the other Loan Documents or under any
    other agreement now existing or hereafter arising between Bank and
    Borrower.

         (d)  Any representation contained herein or in any of the other Loan
    Documents made by Borrower or any Obligated Party is false or misleading in
    any material respect.

    (e)  The occurrence of any event which permits the acceleration of the
    maturity of any indebtedness in excess of $100,000 owing by Borrower to any
    third party under any agreement or understanding.

    (f)  If Borrower or any Obligated Party: (i) becomes insolvent, or makes a
    transfer in fraud of creditors, or makes an assignment for the benefit of
    creditors, or admits in writing its inability to pay its debts as they
    become due; (ii) generally is not paying its debts as such debts become
    due; (iii) has a receiver, trustee or custodian appointed for, or take
    possession of, all or substantially all of the assets of such party, either
    in a proceeding brought by such party or in a proceeding brought against
    such party and such appointment is not discharged or such possession is not
    terminated within  (60) days after the effective date thereof or such party
    consents to or acquiesces in such appointment or possession; (iv) files a
    petition for relief under the United States Bankruptcy Code or any other
    present or future federal or state


LOAN AGREEMENT - Page 12




    insolvency, bankruptcy or similar laws (all of the foregoing hereinafter
    collectively called "APPLICABLE BANKRUPTCY LAW") or an involuntary petition
    for relief is filed against such party under any Applicable Bankruptcy Law
    and such involuntary petition is not dismissed within  (60) days after the
    filing thereof, or an order for relief naming such party is entered under
    any Applicable Bankruptcy Law, or any composition, rearrangement,
    extension, reorganization or other relief of debtors now or hereafter
    existing is requested or consented to by such party; (v) fails to have
    discharged within a period of forty-five (45) days any attachment,
    sequestration or similar writ levied upon any property of such party; or
    (vi) fails to pay within thirty (30) days any final money judgment against
    such party.

         (g)  If Borrower or any Obligated Party is an entity, the liquidation,
    dissolution, merger or consolidation of any such entity, unless Borrower is
    the surviving entity or, if Borrower or any Obligated Party is an
    individual, the death or legal incapacity of any such individual.

         (h)  The entry of any judgment against Borrower or the issuance or
    entry of any attachment or other lien against any of the property of
    Borrower for an amount in excess of $1,000,000.00, if undischarged,
    unbonded or undismissed within forty-five (45) days after such entry.

Nothing contained in this Loan Agreement shall be construed to limit the events
of default enumerated in any of the other Loan Documents and all such events of
default shall be cumulative.  The term "OBLIGATED PARTY ", as used herein, shall
mean any party other than Borrower who secures, guarantees and/or is otherwise
obligated to pay all or any portion of the indebtedness evidenced by the Notes.

    12.  REMEDIES. Upon the occurrence and continuance of any one or more of
the foregoing Events of Default, (a) the entire unpaid balance of principal of
the Notes, together with all accrued but unpaid interest thereon, and all other
indebtedness owing to Bank by Borrower at such time shall, at the option of
Bank, become immediately due and payable without further notice, demand,
presentation, notice of dishonor, notice of intent to accelerate, notice of
acceleration, protest or notice of protest of any kind, all of which are
expressly waived by Borrower, and (b) Bank may, at its option, cease further
advances under any of the Notes and cease issuing any additional Letters of
Credit; PROVIDED, HOWEVER, concurrently and automatically with the occurrence of
an Event of Default under SUBPARAGRAPH (f) in the immediately preceding
paragraph (i) further advances under the Notes and the issuance of additional
Letters of Credit shall cease, and (ii) the Notes and all other indebtedness
owing to Bank by Borrower at such time shall, without any action by Bank, become
due and payable, without further notice, demand, presentation, notice of
dishonor, notice of acceleration, notice of intent to accelerate, protest or
notice of protest of any kind, all of which are expressly waived by Borrower.
All rights and remedies of Bank set forth in this Loan Agreement and in any of
the other Loan Documents may also be exercised by Bank, at its option to be
exercised in its sole discretion, upon the occurrence of an Event of Default.


LOAN AGREEMENT - Page 13



    13.  RIGHTS Cumulative.  All rights of Bank under the terms of this Loan
Agreement shall be cumulative of, and in addition to, the rights of Bank under
any and all other agreements between Borrower and Bank (including, but not
limited to, the other Loan Documents), and not in substitution or diminution of
any rights now or hereafter held by Bank under the terms of any other agreement.

    14.  WAIVER AND Agreement.  Neither the failure nor any delay on the part
of Bank to exercise any right, power or privilege herein or under any of the
other Loan Documents shall operate as a waiver thereof, nor shall any single or
partial exercise of such right, power or privilege preclude any other or further
exercise thereof or the exercise of any other right, power or privilege.  No
waiver of any provision in this Loan Agreement or in any of the other Loan
Documents and no departure by Borrower therefrom shall be effective unless the
same shall be in writing and signed by Bank, and then shall be effective only in
the specific instance and for the purpose for which given and to the extent
specified in such writing.  No modification or amendment to this Loan Agreement
or to any of the other Loan Documents shall be valid or effective unless the
same is signed by the party against whom it is sought to be enforced.

    15.  BENEFITS. This Loan Agreement shall be binding upon and inure to the
benefit of Bank and Borrower, and their respective successors and assigns,
provided, however, that Borrower may not, without the prior written consent of
Bank, assign any rights, powers, duties or obligations under this Loan Agreement
or any of the other Loan Documents.

    16.  NOTICES. All notices, requests, demands or other communications
required or permitted to be given pursuant to this Loan Agreement shall be in
writing and given by (i) personal delivery, (ii) expedited delivery service with
proof of delivery, or (iii) United States mail, postage prepaid, registered or
certified mail, return receipt requested, sent to the intended addressee at the
address set forth on the signature page hereof and shall be deemed to have been
received either, in the case of personal delivery, as of the time of personal
delivery, in the case of expedited delivery service, as of the date of first
attempted delivery at the address and in the manner provided herein, or in the
case of mail, two Business Days after deposited in a depository receptacle under
the care and custody of the United States Postal Service.  Either party shall
have the right to change its address for notice hereunder to any other location
within the continental United States by notice to the other party of such new
address at least thirty (30) days prior to the effective date of such new
address.

    17.  CONSTRUCTION. This Loan Agreement and the other Loan Documents have
been executed and delivered in the State of Texas, shall be governed by and
construed in accordance with the laws of the State of Texas, and shall be
performable by the parties hereto in the county in Texas where the Bank's
address set forth on the signature page hereof is located.


LOAN AGREEMENT - Page 14



    18.  INVALID Provisions.  If any provision of this Loan Agreement or any of
the other Loan Documents is held to be illegal, invalid or unenforceable under
present or future laws, such provision shall be fully severable and the
remaining provisions of this Loan Agreement or any of the other Loan Documents
shall remain in full force and effect and shall not be affected by the illegal,
invalid or unenforceable provision or by its severance.

    19.  EXPENSES. Borrower shall pay all costs and expenses (including,
without limitation, reasonable attorneys' fees) in connection with (i) any
action required in the course of administration of the indebtedness and
obligations evidenced by the Loan Documents, and (ii) any action in the
enforcement of Bank's rights upon the occurrence and continuance of an Event of
Default.

    20.  PARTICIPATION OF THE Loans.  Borrower agrees that Bank may, at its
option, sell interests in the Loans and its rights under this Loan Agreement to
a financial institution or institutions and, in connection with each such sale,
Bank may disclose any financial and other information available to Bank
concerning Borrower to each perspective purchaser.

    21.  ENTIRE AGREEMENT. This Loan Agreement (together with the other Loan
Documents) contains the entire agreement among the parties regarding the subject
matter hereof and supersedes all prior written and oral agreements and
understandings among the parties hereto regarding same.

    22.  CONFLICTS. In the event any term or provision hereof is inconsistent
with or conflicts with any provision of the other Loan Documents, the terms and
provisions contained in this Loan Agreement shall be controlling.

    23.  COUNTERPARTS.' This Loan Agreement may be separately executed in any
number of counterparts, each of which shall be an original, but all of which,
taken together, shall be deemed to constitute one and the same instrument.

    24.  FEES.  In consideration of the financial accommodations granted by
Bank to Borrower under the Acquisition Facility, Borrower agrees to pay to Bank
a fee equal to $21,250.00, which shall be paid to Bank contemporaneously with
the execution hereof In consideration of the financial accommodations granted by
Bank to Borrower under the Line of Credit, Borrower agrees to pay Bank (i) a fee
equal to $12,500.00, such fee to be paid to Bank contemporaneously with the
execution hereof, and (ii) a fee (the "Unused Fee") per annum (based on a year
of 360 days) equal to three-eighths percent (3/8%) of the average daily
un-borrowed amount under the Line of Credit below an amount equal to the
Committed Sum, less the outstanding Letter of Credit Liabilities.  The Unused
Fee shall be payable quarterly in arrears on the last day of each March, June,
September and December during the term of the Line of Credit; provided, however,
the Unused Fee shall not begin to accrue or be due until after the earlier of
(i) December 31, 1996, or (ii) the first advance or loan requested by Borrower
under the Line of Credit or the Acquisition Facility.  Borrower acknowledges
that the Unused Fee is required to be paid and is in consideration


LOAN AGREEMENT - Page 15



of Bank taking appropriate action to ensure that all funds that Bank may advance
under the Line of Credit are available to Borrower when Borrower request same.

    If the foregoing correctly sets forth our mutual agreement, please so
acknowledge by signing and returning this Loan Agreement to the undersigned.

                                                 Very truly yours,

                                                 BANK ONE, TEXAS, NA.

                                                 Bank's Address:
                                                 1717 Main Street
                                                 Dallas, Texas 75201
                                                 Attn: Middle Market Lending
                                                 Group


ACCEPTED as of the date first
written above.

BORROWER:                    Borrower's Address:
                                    13800 Senlac
INTERPHASE CO           Dallas, Texas 75234-8823

/s/  R. Stephen Polley
- ----------------------

R. Stephen Polley
Chairman, Chief Executive Officer and President



LOAN AGREEMENT - Page 16