<PAGE>


================================================================================
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                        MIAMI COMPUTER SUPPLY CORPORATION
                                 AS THE BORROWER

                                       AND

                     THE FINANCIAL INSTITUTIONS NAMED HEREIN
                                   AS LENDERS

                               NATIONAL CITY BANK
                     AS A LENDER AND AS DOCUMENTATION AGENT

                         PNC BANK, NATIONAL ASSOCIATION
                       AS A LENDER, THE SWING LINE LENDER
                            A LETTER OF CREDIT ISSUER
                           AND AS ADMINISTRATIVE AGENT

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

                                 AMENDMENT NO. 4
                                   DATED AS OF
                                 AUGUST 31, 1999
                                       TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
                                   DATED AS OF
                                DECEMBER 1, 1998

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


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================================================================================


<PAGE>


                                 AMENDMENT NO. 4
                                       TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

        THIS AMENDMENT NO. 4 TO AMENDED AND RESTATED CREDIT AGREEMENT,
dated as of August 31, 1999 ("THIS AMENDMENT"), among:

               (i)    MIAMI COMPUTER SUPPLY CORPORATION, an Ohio corporation
        (herein, together with its successors and assigns, the "BORROWER");

               (ii)   the financial institutions listed on the signature pages
        hereof (the "LENDERS");

               (iii)  NATIONAL CITY BANK, a national banking association, as a
        Lender and as Documentation Agent; and

               (iv)   PNC BANK, NATIONAL ASSOCIATION, a national banking
        association, as a Lender, the Swing Line Lender, a Letter of Credit
        Issuer and as Administrative Agent (the "ADMINISTRATIVE AGENT") for the
        Lenders under the Credit Agreement:

        PRELIMINARY STATEMENTS:

        (1) The Borrower, the Lenders named therein, and the Administrative
Agent entered into the Amended and Restated Credit Agreement, dated as of
December 1, 1998, as amended by Amendment No. 1 thereto, dated as of March 31,
1999, Amendment No. 2 thereto, dated as of April 19, 1999, and Amendment No. 3
thereto, dated as of August 13, 1999 (as so amended, the "CREDIT AGREEMENT";
with the terms defined therein, or the definitions of which are incorporated
therein, being used herein as so defined).

        (2) The parties hereto desire to amend certain of the provisions of the
Credit Agreement, all as more fully set forth below.

        NOW, THEREFORE, the parties hereby agree as follows:

        1. AMENDMENTS, ETC. 1.1. COMMITMENTS. Effective on and as of the
Effective Date of this Amendment provided for in section 3 hereof, The
Huntington National Bank is added to the Credit Agreement as a Lender and the
General Revolving Commitments of the Lenders under the Credit Agreement are
changed to the amounts specified below:

<TABLE>
<CAPTION>

Name of Lender                             General Revolving Commitment
---------------------------------          --------------------------------
<S>                                        <C>
PNC Bank National Association                     $25,000,000
Bank One, Indiana, N.A.                           $25,000,000
Firstar Bank, N. A.                               $25,000,000
The Huntington National Bank                      $25,000,000
Key Corporate Capital Inc.                        $25,000,000
National City Bank                                $25,000,000
                                                  -----------
        Total                                     $150,000,000

</TABLE>

<PAGE>

; and Annex I to the Credit Agreement is deemed amended to reflect the foregoing
information.

         1.2. PRICING. Effective on and as of the Effective Date of this
Amendment provided for in section 3 hereof, the Pricing Grid Table which appears
in section 2.7(h) of the Credit Agreement is amended to read in its entirety as
follows:

                                PRICING GRID TABLE
                            (EXPRESSED IN BASIS POINTS)

<TABLE>
<CAPTION>
====================================================================================================
                   RATIO OF                     APPLICABLE           APPLICABLE        APPLICABLE
            CONSOLIDATED TOTAL DEBT          EURODOLLAR MARGIN       PRIME RATE        COMMITMENT
                      TO                        FOR GENERAL            MARGIN           FEE RATE
  TIER       CONSOLIDATED EBITDA              REVOLVING LOANS
====================================================================================================
<S>      <C>                                 <C>                     <C>              <C>
   VI    >= 4.00 to 1.00                          225.00               75.00             37.50
----------------------------------------------------------------------------------------------------
   V     >= 3.20 to 1.00 but < 4.00 to            200.00               50.00             37.50
         1.00
----------------------------------------------------------------------------------------------------
   IV    >= 2.40 to 1.00 but < 3.20 to            175.00               25.00             25.00
         1.00
----------------------------------------------------------------------------------------------------
   III   >= 1.60 to 1.00 but < 2.40 to            150.00                -0-              25.00
         1.00
----------------------------------------------------------------------------------------------------
   II    >= .80 to 1.00 but < 1.60 to             125.00                -0-              20.00
         1.00
----------------------------------------------------------------------------------------------------
   I     < .80 to 1.00                            100.00                -0-              20.00
====================================================================================================
</TABLE>


        1.3. EFFECTIVENESS OF PRICING CHANGES. (a) Effective on and as of the
Effective Date of this Amendment provided for in section 3 hereof, for all
General Revolving Loans then or thereafter outstanding, and until changed in
accordance with the applicable provisions of section 2.7(h) of the Credit
Agreement based on the consolidated financial statements of the Borrower for a
fiscal quarter ended on or nearest to September 30, 1999 or thereafter, the
Applicable Eurodollar Margin for General Revolving Loans will be 200 basis
points per annum and the Applicable Prime Rate Margin for General Revolving
Loans will be 50 basis points per annum.

        (b) Effective on and as of the Effective Date of this Amendment provided
for in section 3 hereof, and until changed in accordance with the applicable
provisions of section 4.1(a) of the Credit Agreement based on the consolidated
financial statements of the Borrower for a fiscal quarter ended on or nearest to
September 30, 1999 or thereafter, the Applicable Commitment Fee Rate will be
37.50 basis points per annum.

                                        2
<PAGE>

        1.4. LEVERAGE RATIO. Effective on and as of the Effective Date of this
Amendment provided for in section 3 hereof, section 9.7 of the Credit Agreement
is amended to read in its entirety as follows:

               9.7. CONSOLIDATED TOTAL DEBT/CONSOLIDATED EBITDA RATIO. The
        Borrower will not at any time permit the ratio of (i) the amount of
        Consolidated Total Debt at such time to (ii) Consolidated EBITDA for the
        Testing Period most recently ended, to exceed (x) 4.20 to 1.00 in the
        case of any Testing Period ended on or prior to March 31, 2000, (y) 4.00
        to 1.00, in the case of the Testing Periods ended June 30, 2000 and
        September 30, 2000, or (z) 3.75 to 1.00, in the case of any Testing
        Period ended thereafter.

        2. REPRESENTATIONS AND WARRANTIES. The Borrower represents and warrants
to the Lenders and the Administrative Agent as follows:

               (a) AUTHORIZATION, VALIDITY AND BINDING EFFECT. This Amendment
        has been duly authorized by all necessary corporate action on the part
        of the Borrower, has been duly executed and delivered by a duly
        authorized officer or officers of the Borrower, and constitutes the
        valid and binding agreement of the Borrower, enforceable against the
        Borrower in accordance with its terms.

               (b) REPRESENTATIONS AND WARRANTIES TRUE AND CORRECT. The
        representations and warranties of the Borrower contained in the Credit
        Agreement, as amended hereby, are true and correct on and as of the date
        hereof as though made on and as of the date hereof, except to the extent
        that such representations and warranties expressly relate to a specified
        date, in which case such representations and warranties are hereby
        reaffirmed as true and correct when made.

               (c) NO EVENT OF DEFAULT, ETC. No condition or event has occurred
        or exists which constitutes or which, after notice or lapse of time or
        both, would constitute an Event of Default.

               (d) COMPLIANCE. The Borrower is in full compliance with all
        covenants and agreements contained in the Credit Agreement, as amended
        hereby.

               (e) RECENT FINANCIAL STATEMENTS. The Borrower has furnished to
        the Lenders and the Administrative Agent complete and correct copies of
        the unaudited condensed consolidated balance sheet of the Borrower and
        its consolidated subsidiaries as of September 30, 1998, and the related
        unaudited condensed consolidated statements of income and of cash flows
        of the Borrower and its consolidated subsidiaries for the fiscal period
        then ended, as contained in the Form 10-Q Quarterly Report of the
        Borrower filed with the SEC. All such financial statements have been
        prepared in accordance with GAAP, consistently applied (except as stated
        therein), and fairly present the financial position of the Borrower and
        its consolidated subsidiaries as of the date indicated and the
        consolidated results of their operations and cash flows for the period
        indicated, subject to normal audit adjustments, none of which will
        involve a Material Adverse Effect.

        3. EFFECTIVENESS. This Amendment shall become effective on a date (the
"EFFECTIVE DATE"), on or before August 31, 1999, if the following conditions are
satisfied on or before the Effective Date:

                                              3
<PAGE>

               (a) this Amendment shall have been executed by the Borrower and
        the Administrative Agent, and counterparts hereof as so executed shall
        have been delivered to the Administrative Agent;

               (b) the Acknowledgment and Consent appended hereto shall have
        been executed by the Credit Parties named therein, and counterparts
        hereof as so executed shall have been delivered to the Administrative
        Agent;

               (c) the Administrative Agent shall have been notified by the
        Lenders that such Lenders have executed this Amendment (which
        notification may be by facsimile or other written confirmation of such
        execution);

               (d) the Borrower shall have paid to the Administrative Agent in
        immediately available funds, for the account of The Huntington National
        Bank, a nonrefundable closing fee, calculated at the rate of 20 basis
        points on the General Revolving Commitment of such Lender, which closing
        fee shall be promptly paid by the Administrative Agent to such Lender;

               (e) the Administrative Agent shall have received, in sufficient
        quantity for the Administrative Agent and the Lenders, certified copies
        of the resolutions of the Board of Directors of the Borrower, approving
        this Amendment;

               (f) there shall have been delivered to the Administrative Agent
        for the account of each Lender the appropriate General Revolving Note or
        Notes executed by the Borrower, in each case, in the amount, maturity
        and as otherwise provided in the Credit Agreement, as amended hereby;
        and

               (g) contemporaneously with the Effective Date, (1) the Borrower
        shall have paid all accrued interest and Commitment Fees; and (2) the
        outstanding General Revolving Loans shall have been prepaid in full out
        of the proceeds of one or more Borrowings from all of the Lenders party
        to the Credit Agreement, as amended hereby (with the Administrative
        Agent, the Borrower and the Lenders party to the Credit Agreement before
        the addition of The Huntington National Bank making arrangements, to be
        coordinated by the Administrative Agent, for the netting of amounts due
        to or from such parties).

 The Administrative Agent shall notify the Borrower and each Lender in writing
of the effectiveness hereof.

        4. RATIFICATIONS. The terms and provisions set forth in this Amendment
shall modify and supersede all inconsistent terms and provisions set forth in
the Credit Agreement, and except as expressly modified and superseded by this
Amendment, the terms and provisions of the Credit Agreement are ratified and
confirmed and shall continue in full force and effect.

        5. MISCELLANEOUS. 5.1. SUCCESSORS AND ASSIGNS. This Amendment shall be
binding upon and inure to the benefit of the Borrower, each Lender and the
Administrative Agent and their respective permitted successors and assigns.

        5.2. SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations
and warranties made in this Amendment shall survive the execution and delivery
of this Amendment, and no investigation by

                                       4
<PAGE>


the Administrative Agent or any Lender or any subsequent Loan or issuance of
a Letter of Credit shall affect the representations and warranties or the
right of the Administrative Agent or any Lender to rely upon them.

        5.3. REFERENCE TO CREDIT AGREEMENT. The Credit Agreement and any and all
other agreements, instruments or documentation now or hereafter executed and
delivered pursuant to the terms of the Credit Agreement as amended hereby, are
hereby amended so that any reference therein to the Credit Agreement shall mean
a reference to the Credit Agreement as amended hereby.

        5.4. EXPENSES. As provided in the Credit Agreement, but without limiting
any terms or provisions thereof, the Borrower agrees to pay on demand all costs
and expenses incurred by the Administrative Agent in connection with the
preparation, negotiation, and execution of this Amendment, including without
limitation the costs and fees of the Administrative Agent's special legal
counsel, regardless of whether this Amendment becomes effective in accordance
with the terms hereof, and all costs and expenses incurred by the Administrative
Agent or any Lender in connection with the enforcement or preservation of any
rights under the Credit Agreement, as amended hereby.

        5.5. SEVERABILITY. Any term or provision of this Amendment held by a
court of competent jurisdiction to be invalid or unenforceable shall not impair
or invalidate the remainder of this Amendment and the effect thereof shall be
confined to the term or provision so held to be invalid or unenforceable.

        5.6. APPLICABLE LAW. This Amendment shall be governed by and construed
in accordance with the laws of the State of Ohio.

        5.7. HEADINGS. The headings, captions and arrangements used in this
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

        5.8. ENTIRE AGREEMENT. This Amendment is specifically limited to the
matters expressly set forth herein. This Amendment and all other instruments,
agreements and documentation executed and delivered in connection with this
Amendment embody the final, entire agreement among the parties hereto with
respect to the subject matter hereof and supersede any and all prior
commitments, agreements, representations and understandings, whether written or
oral, relating to the matters covered by this Amendment, and may not be
contradicted or varied by evidence of prior, contemporaneous or subsequent oral
agreements or discussions of the parties hereto. There are no oral agreements
among the parties hereto relating to the subject matter hereof or any other
subject matter relating to the Credit Agreement.

        5.9. COUNTERPARTS. This Amendment may be executed by the parties hereto
separately in one or more counterparts, each of which when so executed shall be
deemed to be an original, but all of which when taken together shall constitute
one and the same agreement.


                                              5
<PAGE>


        IN WITNESS WHEREOF, this Amendment has been duly executed and delivered
as of the date first above written.


MIAMI COMPUTER SUPPLY                 PNC BANK, NATIONAL ASSOCIATION,
CORPORATION                             INDIVIDUALLY AS A LENDER, A LETTER OF
                                        CREDIT ISSUER, THE SWING LINE LENDER
                                        AND AS ADMINISTRATIVE AGENT

BY:
   ------------------------------
        TITLE:                        BY:
                                         ----------------------------------
                                               VICE PRESIDENT

NATIONAL CITY BANK,                      FIRSTAR BANK, N. A.
  INDIVIDUALLY AS A LENDER AND
  AS DOCUMENTATION AGENT

                                      BY:
                                         ----------------------------------
BY:                                            TITLE:
   ------------------------------
        TITLE:

KEY CORPORATE CAPITAL INC.               THE HUNTINGTON NATIONAL BANK



BY:                                   BY:
   ------------------------------        ----------------------------------
        TITLE:                                 TITLE:

BANK ONE, INDIANA, N. A.



BY:
   ------------------------------
        TITLE:


                                        6
<PAGE>


                           ACKNOWLEDGMENT AND CONSENT

        For the avoidance of doubt, and without limitation of the intent and
effect of sections 6 and 10 of the Amended and Restated Subsidiary Guaranty (as
such term is defined in the Credit Agreement referred to in the Amendment No. 4
to Amended and Restated Credit Agreement (the "AMENDMENT"), to which this
Acknowledgment and Consent is appended), each of the undersigned hereby
unconditionally and irrevocably (i) acknowledges receipt of a copy of the Credit
Agreement and the Amendment, and (ii) consents to all of the terms and
provisions of the Credit Agreement as amended by the Amendment.

        Capitalized terms which are used herein without definition shall have
the respective meanings ascribed thereto in the Credit Agreement referred to
herein. This Acknowledgment and Consent is for the benefit of the Lenders and
the Administrative Agent, any other person who is a third party beneficiary of
the Subsidiary Guaranty, and their respective successors and assigns. No term or
provision of this Acknowledgment and Consent may be modified or otherwise
changed without the prior written consent of the Administrative Agent, given as
provided in the Credit Agreement. This Acknowledgment and Consent shall be
binding upon the successors and assigns of each of the undersigned. This
Acknowledgment and Consent may be executed by any of the undersigned in separate
counterparts, each of which shall be an original and all of which together shall
constitute one and the same instrument.

        IN WITNESS WHEREOF, each of the undersigned has duly executed and
delivered this Acknowledgment and Consent as of the date of the Amendment
referred to herein.


 Diversified Data Products, Inc.             Electronic Image Systems, Inc.
 Britco, Inc.                                Consolidated Media Systems, Inc.
 Minnesota Western, Inc.
 Computer Showcase, Inc.
 TBS Printware Corporation                   By:
                                               -------------------------------
                                                 Ira Stanley, an officer
 By:
    ----------------------------------
      Michael E. Peppel, an officer