Document:

<PAGE>

                                                                 Exhibit 10(xii)

                       CONFIDENTIAL TREATMENT REQUESTED

     Confidential Portions of This Amendment Which Have Been Redacted Are Marked
With Brackets ("[***]"). The Omitted Material Has Been Filed Separately With The
United States Securities and Exchange Commission.

                      AMENDMENT NO. 2 TO CREDIT AGREEMENT
                      -----------------------------------

          THIS AMENDMENT NO. 2 TO CREDIT AGREEMENT (this "Amendment") dated as
                                                          ---------
of July 25, 2001, by and among NATIONAL DATA CORPORATION, a Delaware
corporation, as Borrower, the banks and other financial institutions listed on
the signature pages hereof, as Lenders, and BANK ONE, NA, a national banking
association having its principal office in Chicago, Illinois, as Administrative
Agent, Swing Line Lender and LC Issuer.

                             W I T N E S S E T H:
                             - - - - - - - - - -

          WHEREAS, Borrower, the Lenders, and the Administrative Agent are
parties to a certain Credit Agreement dated as of January 31, 2001, as amended
by a certain Amendment No. 1 to Credit Agreement dated as of May 22, 2001 (as so
amended, the "Credit Agreement"; capitalized terms used in this Amendment
without definition that are defined in the Credit Agreement shall have the
meanings in this Amendment as specified for such capitalized terms in the Credit
Agreement);

          WHEREAS, Borrower and Lenders have agreed to amend the Credit
Agreement in certain respects as set forth in this Amendment;

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

          SECTION 1.  Amendments to Credit Agreement. Subject to the
                      -------------------------------
satisfaction of the conditions precedent set forth in Section 2 hereof, and
effective as of the Effective Date (as hereinafter defined), Section 1.1 of the
Credit Agreement is hereby amended by deleting the defined terms "Initial
                                                                  -------
MedUnite Assets", "Initial MedUnite Transaction", and "Subsequent MedUnite
---------------    ----------------------------        -------------------
Transactions" and accompanying definitions, and substituting in lieu thereof the
------------
following defined terms and accompanying definitions:

          "Initial MedUnite Assets" means those assets to be transferred to
           -----------------------
     MedUnite pursuant to the Initial MedUnite Transaction, such assets to be
     comprised of tangible assets having an aggregate book value of
     approximately [***] (in each case as reflected on the Borrower's March 31,
     2001 pro forma financial statements furnished to the Lenders), all of which
     assets are used in connection with the Borrower's physician real-time and
     batch
<PAGE>

                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

     clearinghouse network business based in Norcross, Georgia, and Richmond,
     Virginia, and include the Norcross computer network data center, and
     contracts with payers, providers and EDI clearinghouses.

          "Initial MedUnite Transaction" means the transfer and assignment by
           ----------------------------
     Borrower to MedUnite of the Initial MedUnite Assets, together with
     contributed liabilities of the Borrower of approximately [***] (as
     reflected on the Borrower's March 31, 2001 pro forma financial statements
     furnished to the Lenders) to be assumed by MedUnite, in exchange for
     capital stock of MedUnite representing 17.9% of the total equity of
     MedUnite.

          "Subsequent MedUnite Transactions" means one or more cash Investments
           --------------------------------
     made by the Borrower in MedUnite, subsequent to the Initial MedUnite
     Transaction, in exchange for capital stock of MedUnite in an aggregate
     amount for all such cash Investments not to exceed [***].

          SECTION 2.  Conditions to Effectiveness of Amendment.  This Amendment
                      ----------------------------------------
shall become effective on the first day when the Administrative Agent shall have
received counterparts of this Amendment as executed on behalf of Borrower and
the Lenders, together with the Acknowledgment and Agreement of Subsidiary
Guarantors as executed on behalf of the Subsidiary Guarantors.  Such date shall
be the "Amendment No. 2 Effective Date" for purposes of this Amendment.
        ------------------------------

          SECTION 3.  Status of Obligations.  Borrower hereby confirms and
                      ---------------------
agrees that all Loans and all other Obligations outstanding under the Credit
Agreement and the other Loan Documents as of the date hereof were duly and
validly created and incurred by Borrower thereunder, that all such outstanding
amounts are owed in accordance with the terms of the Credit Agreement and other
Loan Documents, and that there are no rights of offset, defense, counterclaim,
claim or objection in favor of Borrower arising out of or with respect to any of
the Loans or other Obligations of Borrower to the Administrative Agent or the
Lenders, and any such rights of offset, defense, counterclaim, claims or
objections have been and are hereby waived and released by Borrower.

          SECTION 4.  Representations and Warranties of Borrower.  Borrower,
                      ------------------------------------------
without limiting the representations and warranties provided in the Credit
Agreement, represents and warrants to the Lenders and the Administrative Agent
as follows:

          4.1  The execution, delivery and performance by Borrower of this
Amendment are within Borrower's corporate powers, have been duly authorized by
all necessary corporate action (including any necessary shareholder action) and
do not and will not (a) violate any provision of any law, rule or regulation,
any judgment, order or ruling of any court or governmental agency, the
certificate of incorporation or by-laws of Borrower, or any indenture, agreement
or other instrument to which Borrower is a
<PAGE>

party or by which Borrower or any of its properties is bound or (b) be in
conflict with, result in a breach of, or constitute with notice or lapse of time
or both a default under any such indenture, agreement or other instrument.

          4.2  This Amendment constitutes the legal, valid and binding
obligation of Borrower, enforceable against Borrower in accordance with its
terms.

          4.3  After giving effect to this Amendment, no Default or Event of
Default has occurred and is continuing.

          4.4  The representations and warranties of Borrower contained in the
Credit Agreement are true and accurate on and as of the date of this Amendment,
except for changes expressly permitted under the terms of the Credit Agreement
and except to the extent that such representations and warranties relate solely
to an earlier date (in which case such representations and warranties were true
and accurate as of such earlier date).

          4.5  Since February 28, 2001, there have been no events, acts,
conditions or occurrences of whatever nature, singly or in the aggregate, which
have had, or could reasonably be expected to have, a Material Adverse Effect.

          SECTION 5.  Survival.  Each of the foregoing representations and
                      --------
warranties shall be made at and as of the date of this Amendment and shall be
deemed to have been made as of the Amendment No. 2 Effective Date.  Each of the
                                             -----
foregoing representations and warranties shall constitute a representation and
warranty of Borrower under the Credit Agreement, and it shall be an Event of
Default if any such representation and warranty shall prove to have been
incorrect or false in any material respect at the time when made or deemed to
have been made.  Each of the foregoing representations and warranties shall
survive and not be waived by the execution and delivery of this Amendment or any
investigation by the Lenders or the Administrative Agent.

          SECTION 6.  Ratification of Credit Agreement and Loan Documents.
                      ---------------------------------------------------
Except as expressly amended herein, all terms, covenants and conditions of the
Credit Agreement and the other Loan Documents shall remain in full force and
effect, and the parties hereto do expressly ratify and confirm the Credit
Agreement (as amended herein) and the other Loan Documents.  All future
references to the Credit Agreement shall be deemed to refer to the Credit
Agreement as amended hereby.

          SECTION 7.  Indemnity.   In consideration of the amendments agreed to
                      ----------
by the Lenders pursuant to this Amendment, Borrower hereby indemnifies the
Administrative Agent, and each Lender, and their respective officers, partners,
directors, employees, representatives and agents from, and hold each of them
harmless against, any and all costs, losses, liabilities, claims, damages or
expenses incurred by
<PAGE>

any of them (whether or not any of them is designated a party thereto) (an
"Indemnitee") arising out of or by reason of any investigation, litigation or
other proceeding related to this Amendment, the Credit Agreement or any other
Loan Documents or any actual or proposed use of the proceeds of any of the
Loans, including, without limitation, the reasonable fees and disbursements of
counsel incurred in connection with any such investigation, litigation or other
proceeding; provided, however, Borrower shall not be obligated to indemnify any
Indemnitee for any of the foregoing arising out of such Indemnitee's gross
negligence or willful misconduct.

          SECTION 8.  No Waiver, Etc.  Borrower hereby agrees that nothing
                      ---------------
herein shall constitute a waiver by the Lenders of any Default or Event of
Default, whether known or unknown, which may exist under the Credit Agreement.
Borrower hereby further agrees that no action, inaction or agreement by the
Lenders, including without limitation, any indulgence, waiver, consent or
agreement altering the provisions of the Credit Agreement which may have
occurred with respect to the non-performance of any obligation under the terms
of the Credit Agreement or any portion thereof, or any other matter relating to
the Credit Agreement, shall require or imply any future indulgence, waiver, or
agreement by the Lenders.

          SECTION 9.  Binding Nature.  This Amendment shall be binding upon and
                      --------------
inure to the benefit of the parties hereto, their respective successors,
successors-in-titles, and assigns.

          SECTION 10.  Costs and Expenses.  Borrower shall be responsible for
                       ------------------
the costs and expenses of the Administrative Agent in connection with the
preparation, execution and delivery of this Amendment and the other instruments
and documents to be delivered hereunder, including, without limitation, the fees
and out-of-pocket expenses of counsel for the Administrative Agent with respect
thereto.

          SECTION 11. GOVERNING LAW.  THIS AMENDMENT SHALL BE GOVERNED BY, AND
                      -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF GEORGIA.

          SECTION 12. Entire Understanding.  This Amendment sets forth the
                      --------------------
entire understanding of the parties with respect to the matters set forth
herein, and shall supersede any prior negotiations or agreements, whether
written or oral, with respect thereto.

          SECTION 13. Counterparts.  This Amendment may be executed in any
                      ------------
number of counterparts and by the different parties hereto in separate
counterparts and may be delivered by telecopier.  Each counterpart so executed
and delivered shall be  deemed an original and all of which taken together shall
constitute but one and the same instrument.
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed and delivered by their duly authorized officers as of the day
and year first above written.

                                   NATIONAL DATA CORPORATION

                                   By: /s/ Patricia A. Wilson
                                      -------------------------
                                      Name:  Patricia A. Wilson
                                      Title: General Counsel
<PAGE>

                                   BANK ONE, NA,
                                   as Administrative Agent, Lender, LC Issuer
                                   and Swing Line Lender

                                   By: /s/ Jennifer Schmoll
                                      --------------------------------
                                      Name:  Jennifer Schmoll
                                      Title: Customer Service Officer
<PAGE>

                                   SUNTRUST BANK,
                                   as Lender

                                   By: /s/ Robert Massenburg
                                      -----------------------------
                                      Name:  Robert Massenburg
                                      Title: Director
<PAGE>

                                   WACHOVIA BANK, N.A.
                                   as Lender

                                   By: /s/ Karen H. McClain
                                      ----------------------------
                                      Name:  Karen H. McClain
                                      Title: Senior Vice President
<PAGE>

             ACKNOWLEDGMENT AND AGREEMENT OF SUBSIDIARY GUARANTORS
             -----------------------------------------------------

          Reference is hereby made to the within and foregoing Amendment No. 2
to Credit Agreement, dated as of July 25, 2001, by and among NATIONAL DATA
CORPORATION, a Delaware corporation ("Borrower"), BANK ONE, NA, a national
banking association, as Administrative Agent, Lender, Swing Line Lender and LC
Issuer, SUNTRUST BANK, a Georgia banking corporation, as Lender, and WACHOVIA
BANK, N.A., a national banking association, as Lender ("Amendment No. 2";
capitalized terms used herein that are defined in Amendment No. 2 or in the
"Credit Agreement" as defined in Amendment No. 2 being used herein with the
respective meanings assigned to such capitalized terms in Amendment No. 2 or the
Credit Agreement, as the case may be).  Each of the undersigned, which is a
Subsidiary Guarantor under the terms of the Subsidiary Guarantee as provided in
the Credit Agreement, hereby acknowledges and agrees that (i) the undersigned
has consented to the foregoing Amendment No. 2, (ii) the Subsidiary Guarantee
and the other Loan Documents to which each of the undersigned is a party shall
remain in full force and effect on and after the date hereof, and (iii)  each of
the undersigned hereby reaffirms and restates its obligations and liabilities
under the Subsidiary Guarantee and the other Loan Documents to which each of
the undersigned is a party after giving effect to Amendment No. 2.

     This Acknowledgment and Agreement of Subsidiary Guarantors made and
delivered as of July 25, 2001.

                              GUARANTORS:
                              ----------

                              NDC HEALTH INFORMATION SERVICES
                              (ARIZONA) INC., as a Subsidiary Guarantor

                              By:  ________________________________
                                   Name:
                                   Title:

                              SOURCE INFORMATICS INC.,
                              as a Subsidiary Guarantor

                              By:  ________________________________
<PAGE>

                                   Name:
                                   Title:
<PAGE>

                              THE COMPUTER PLACE, INC.,
                              as a Subsidiary Guarantor

                              By:_____________________________
                                   Name:
                                   Title:<PAGE>

                                                                Exhibit 10(xiii)

                                PROMISSORY NOTE

$1,128,373.24                                                Date: April 3, 2001

     FOR VALUE RECEIVED, the undersigned, MRY Partners, L.P., a Georgia limited
partnership (the "Borrower"), hereby unconditionally promises to pay to the
order of National Data Corporation (hereafter, together with any holder hereof,
the "Holder") at the offices of the Holder located at National Data Plaza,
Atlanta, Georgia 30329, or at such other place as the Holder may designate in
writing to the Borrower, in lawful money of the United States of America, in
immediately available funds, the principal sum of ONE MILLION ONE HUNDRED TWENTY
- EIGHT THOUSAND THREE HUNDRED SEVENTY-THREE AND 24/100 DOLLARS ($1,128,373.24),
together with interest on the principal balance from time to time outstanding
hereunder (computed on the basis of a 360-day year for the actual number of days
elapsed) from the date hereof until paid in full at a per annum rate equal to
4.63% in simple interest terms.

     The principal balance shall be payable in full on July 28, 2002. Accrued
interest shall be payable annually on each April 3 during the term of this Note.
Accrued interest shall also be due and payable on any date on which the
principal balance is due (whether by acceleration, maturity or otherwise) other
than any date on which a Collateral Sale Mandatory Prepayment is due.

     The Borrower shall prepay a portion of the outstanding principal amount
owing under this Note immediately following the settlement date with respect to
the sale, transfer or other disposition of a portion (but not all) of the July
28, 1992 Option Securities (as such term is defined Schedule 1 to that certain
Stock Pledge Agreement dated as of the date hereof between the Borrower and the
Holder). Such prepayment shall be in an amount equal to the product of (a) a
fraction, (i) the numerator of which is the number of shares of such July 28,
1992 Option Securities so sold, transferred or disposed of, and (ii) the
denominator of which is the total number of shares of such July 28, 1992 Option
Securities owned by the Borrower immediately prior to such sale, transfer or
disposition, multiplied by (b) the unpaid principal amount of this note as of
such date (the "Collateral Sale Mandatory Prepayment"). Upon a sale, transfer or
other disposition of all of the July 28, 1992 Option Securities, the entire
principal balance hereunder and any accrued interest thereon shall become due
and payable immediately following the settlement date with respect to the sale,
transfer or other disposition.

     Interest shall accrue on any amount past due hereunder at a per annum rate
equal to 2.0% in excess of the interest rate otherwise payable hereunder. All
such interest shall be due and payable on demand.

     In no event shall the amount of interest due and payable under this Note
exceed the maximum rate of interest allowed by applicable law and, in the event
any such payment is inadvertently paid by the Borrower or inadvertently received
by the Holder, then such excess sum shall be credited as a payment of principal,
unless the Borrower shall notify the Holder in writing that the Borrower elects
to have such excess sum returned to it forthwith. It is the express intent of
<PAGE>

the parties hereto that the Borrower not pay and the Holder not receive,
directly or indirectly, in any manner whatsoever, interest in excess of that
which may be lawfully paid by the Borrower under applicable law.

     THE BORROWER, AND THE HOLDER BY ACCEPTING THIS NOTE, EACH AGREES AND
STIPULATES THAT THE ONLY CHARGE IMPOSED UPON THE BORROWER FOR THE USE OF MONEY
IN CONNECTION WITH THIS NOTE IS AND SHALL BE THE INTEREST DESCRIBED IN THE FIRST
PARAGRAPH HEREOF, AND FURTHER AGREES AND STIPULATES THAT ALL OTHER CHARGES
IMPOSED BY THE HOLDER ON THE BORROWER IN CONNECTION WITH THIS NOTE, INCLUDING
WITHOUT LIMITATION, ALL DEFAULT CHARGES, LATE CHARGES AND ATTORNEYS' FEES, ARE
CHARGES MADE TO COMPENSATE THE HOLDER FOR ADMINISTRATIVE SERVICES AND COSTS OR
LOSSES INCURRED, AND TO BE INCURRED, BY THE HOLDER IN CONNECTION WITH THIS NOTE
AND SHALL UNDER NO CIRCUMSTANCES BE DEEMED TO BE CHARGES FOR THE USE OF MONEY
PURSUANT TO OFFICIAL CODE OF GEORGIA ANNOTATED SECTION 7-4-2 OR SECTION 7-4-18.
ALL CHARGES OTHER THAN CHARGES FOR THE USE OF MONEY SHALL BE FULLY EARNED AND
NONREFUNDABLE WHEN DUE.

     Each of the following events shall constitute an "Event of Default" under
this Note: (i) failure of the Borrower to pay any principal, interest or other
amount due hereunder when due; (ii) the Borrower shall fail to comply with any
of the terms, covenants or conditions contained in this Note or in the Stock
Pledge Agreement dated as of the date hereof executed by the Borrower in favor
of the Holder (as amended, restated, supplemented or otherwise modified from
time to time, the "Pledge Agreement"); (iii) any written representation or
warranty made at any time by the Borrower to the Holder shall prove to have been
incorrect or misleading in any material respect when made; (iv) the institution
of bankruptcy proceedings against the Borrower or Robert A. Yellowlees and such
proceedings have not been dismissed on or before 60 days after the institution
thereof, the bankruptcy of the Borrower or Robert A. Yellowlees or the
commencement of a voluntary case by the Borrower or Robert A. Yellowlees under
the Bankruptcy Code of 1978, as amended or other federal bankruptcy law (as now
or hereafter in effect); (v) the Holder shall cease to have a valid and
perfected security interest in the Collateral (as defined in the Pledge
Agreement) for any reason other than the failure of the Holder to take any
action within its control; and (vi) the Holder shall reasonably determine that
the prospect of repayment under this Note is impaired.

     Upon the occurrence of an Event of Default (other than an Event of Default
described in clause (iv) of the definition thereof), the entire outstanding
principal balance of this Note, together with all accrued and unpaid interest
thereon, and all of the Borrower's other obligations owing hereunder, at the
option of the Holder, and without demand or notice of any kind, may be
immediately declared, and thereupon shall immediately become in default and due
and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise. Upon the occurrence of an Event
of Default described in clause (iv) of the definition thereof, the entire
outstanding principal balance of this Note, together with all accrued and unpaid
interest thereon, and all of the Borrower's other obligations owing hereunder,
without demand or

                                      -2-
<PAGE>

notice of any kind, shall immediately become in default and
due and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise.

     The Borrower shall pay all expenses incurred by the Holder in the
collection of this Note, including, without limitation, the reasonable fees and
disbursements of counsel to the Holder if this Note is collected by or through
an attorney-at-law.

     Time is of the essence of this Note.

     EACH OF THE HOLDER AND THE BORROWER HEREBY AGREES THAT ANY ACTION OR
PROCEEDING RELATING TO THIS NOTE SHALL BE SUBJECT TO BINDING ARBITRATION BEFORE
THE NATIONAL ASSOCIATION OF SECURITIES DEALERS ("NASD") OR, IF FOR ANY REASON
INELIGIBLE, THE AMERICAN ARBITRATION ASSOCIATION ("ASA"), IN ACCORDANCE WITH THE
RULES OF PROCEDURE THEN IN EFFECT. ANY ARBITRATION PROCEEDINGS SHALL TAKE PLACE
IN ATLANTA, GEORGIA AND BORROWER IRREVOCABLY SUBMITS AND CONSENTS TO THIS
ARBITRATION PROVISION AND VENUE.

     THE BORROWER AGREES THAT ALL OF ITS PAYMENT OBLIGATIONS HEREUNDER SHALL BE
ABSOLUTE, UNCONDITIONAL AND, FOR THE PURPOSES OF MAKING PAYMENTS HEREUNDER, THE
BORROWER HEREBY WAIVES ANY RIGHT TO ASSERT ANY SETOFF, COUNTERCLAIM OR CROSS-
CLAIM.

     No delay or failure on the part of the Holder in the exercise of any right
or remedy shall operate as a waiver thereof, and no single or partial exercise
by the Holder of any right or remedy shall preclude other or further exercise
thereof or the exercise of any other right or remedy.

     All amendments to this Note, and any waiver or consent of the Holder, must
be in writing and signed by the Holder and the Borrower.

     The Borrower hereby waives presentment, demand, notice of dishonor,
protests and all other notices whatever.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS
OF THE STATE OF GEORGIA.

     This Note shall be binding upon the administrators, successors or assigns
of the Borrower. A Holder of this Note may assign or transfer this Note to any
person or entity without notice to, or the consent of, the Borrower; provided,
this Note may not be assigned by the Borrower.

     Any notice to be given hereunder shall be in writing, shall be sent to the
Holder's address as specified in the first paragraph hereof or the Borrower's
addresses set forth below its signature hereto, as the case may be, and shall be
deemed received (i) on the earlier of the date of receipt or the date three
business days after deposit of such notice in the United States mail, if sent
postage prepaid, certified mail, return receipt requested or (ii) when actually
received, if personally delivered.

                                      -3-
<PAGE>

                           [Signature on Next Page]

                                      -4-
<PAGE>

     IN WITNESS WHEREOF, the Borrower has executed and delivered this Promissory
Note under seal as of the date and year first written above.

                                          MRY PARTNERS, L.P.

                                          By:  /s/ Robert A. Yellowlees
                                               ------------------------------
                                          Name: Robert A. Yellowlees
                                          Title: General Partner

                                      -5-
<PAGE>

                                PROMISSORY NOTE

$1,483,503.21                                                Date: April 3, 2001

     FOR VALUE RECEIVED, the undersigned, MRY Partners, L.P., a Georgia limited
partnership (the "Borrower"), hereby unconditionally promises to pay to the
order of National Data Corporation (hereafter, together with any holder hereof,
the "Holder") at the offices of the Holder located at National Data Plaza,
Atlanta, Georgia 30329, or at such other place as the Holder may designate in
writing to the Borrower, in lawful money of the United States of America, in
immediately available funds, the principal sum of ONE MILLION FOUR HUNDRED
EIGHT-THREE THOUSAND FIVE HUNDRED THREE AND 21/100 DOLLARS ($1,483,503.21),
together with interest on the principal balance from time to time outstanding
hereunder (computed on the basis of a 360-day year for the actual number of days
elapsed) from the date hereof until paid in full at a per annum rate equal to
4.63% in simple interest terms.

     The principal balance shall be payable in full on June 1, 2003. Accrued
interest shall be payable annually on each April 3 during the term of this Note.
Accrued interest shall also be due and payable on any date on which the
principal balance is due (whether by acceleration, maturity or otherwise) other
than any date on which a Collateral Sale Mandatory Prepayment is due.

     The Borrower shall prepay a portion of the outstanding principal amount
owing under this Note immediately following the settlement date with respect to
the sale, transfer or other disposition of a portion (but not all) of the June
1, 1993 Option Securities (as such term is defined Schedule 1 to that certain
Stock Pledge Agreement dated as of the date hereof between the Borrower and the
Holder). Such prepayment shall be in an amount equal to the product of (a) a
fraction, (i) the numerator of which is the number of shares of such June 1,
1993 Option Securities so sold, transferred or disposed of, and (ii) the
denominator of which is the total number of shares of such June 1, 1993 Option
Securities owned by the Borrower immediately prior to such sale, transfer or
disposition, multiplied by (b) the unpaid principal amount of this note as of
such date (the "Collateral Sale Mandatory Prepayment"). Upon a sale, transfer or
other disposition of all of the June 1, 1993 Option Securities, the entire
principal balance hereunder and any accrued interest thereon shall become due
and payable immediately following the settlement date with respect to the sale,
transfer or other disposition.

     Interest shall accrue on any amount past due hereunder at a per annum rate
equal to 2.0% in excess of the interest rate otherwise payable hereunder. All
such interest shall be due and payable on demand.

     In no event shall the amount of interest due and payable under this Note
exceed the maximum rate of interest allowed by applicable law and, in the event
any such payment is inadvertently paid by the Borrower or inadvertently received
by the Holder, then such excess sum shall be credited as a payment of principal,
unless the Borrower shall notify the Holder in writing that the Borrower elects
to have such excess sum returned to it forthwith. It is the express intent of
the parties hereto that the Borrower not pay and the Holder not receive,
directly or indirectly, in any manner whatsoever, interest in excess of that
which may be lawfully paid by the Borrower under applicable law.

                                      -6-
<PAGE>

          THE BORROWER, AND THE HOLDER BY ACCEPTING THIS NOTE, EACH AGREES AND
STIPULATES THAT THE ONLY CHARGE IMPOSED UPON THE BORROWER FOR THE USE OF MONEY
IN CONNECTION WITH THIS NOTE IS AND SHALL BE THE INTEREST DESCRIBED IN THE FIRST
PARAGRAPH HEREOF, AND FURTHER AGREES AND STIPULATES THAT ALL OTHER CHARGES
IMPOSED BY THE HOLDER ON THE BORROWER IN CONNECTION WITH THIS NOTE, INCLUDING
WITHOUT LIMITATION, ALL DEFAULT CHARGES, LATE CHARGES AND ATTORNEYS' FEES, ARE
CHARGES MADE TO COMPENSATE THE HOLDER FOR ADMINISTRATIVE SERVICES AND COSTS OR
LOSSES INCURRED, AND TO BE INCURRED, BY THE HOLDER IN CONNECTION WITH THIS NOTE
AND SHALL UNDER NO CIRCUMSTANCES BE DEEMED TO BE CHARGES FOR THE USE OF MONEY
PURSUANT TO OFFICIAL CODE OF GEORGIA ANNOTATED SECTION 7-4-2 OR SECTION 7-4-18.
ALL CHARGES OTHER THAN CHARGES FOR THE USE OF MONEY SHALL BE FULLY EARNED AND
NONREFUNDABLE WHEN DUE.

          Each of the following events shall constitute an "Event of Default"
under this Note:  (i) failure of the Borrower to pay any principal, interest or
other amount due hereunder when due; (ii) the Borrower shall fail to comply with
any of the terms, covenants or conditions contained in this Note or in the Stock
Pledge Agreement dated as of the date hereof executed by the Borrower in favor
of the Holder (as amended, restated, supplemented or otherwise modified from
time to time, the "Pledge Agreement"); (iii) any written representation or
warranty made at any time by the Borrower to the Holder shall prove to have been
incorrect or misleading in any material respect when made; (iv) the institution
of bankruptcy proceedings against the Borrower or Robert A. Yellowlees and such
proceedings have not been dismissed on or before 60 days after the institution
thereof, the bankruptcy of the Borrower or Robert A. Yellowlees or the
commencement of a voluntary case by the Borrower or Robert A. Yellowlees under
the Bankruptcy Code of 1978, as amended or other federal bankruptcy law (as now
or hereafter in effect); (v) the Holder shall cease to have a valid and
perfected security interest in the Collateral (as defined in the Pledge
Agreement) for any reason other than the failure of the Holder to take any
action within its control; and (vi) the Holder shall reasonably determine that
the prospect of repayment under this Note is impaired.

          Upon the occurrence of an Event of Default (other than an Event of
Default described in clause (iv) of the definition thereof), the entire
outstanding principal balance of this Note, together with all accrued and unpaid
interest thereon, and all of the Borrower's other obligations owing hereunder,
at the option of the Holder, and without demand or notice of any kind, may be
immediately declared, and thereupon shall immediately become in default and due
and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise.  Upon the occurrence of an Event
of Default described in clause (iv) of the definition thereof, the entire
outstanding principal balance of this Note, together with all accrued and unpaid
interest thereon, and all of the Borrower's other obligations owing hereunder,
without demand or notice of any kind, shall immediately become in default and
due and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise.

                                      -7-
<PAGE>

          The Borrower shall pay all expenses incurred by the Holder in the
collection of this Note, including, without limitation, the reasonable fees and
disbursements of counsel to the Holder if this Note is collected by or through
an attorney-at-law.

Time is of the essence of this Note.

          EACH OF THE HOLDER AND THE BORROWER HEREBY AGREES THAT ANY ACTION OR
PROCEEDING RELATING TO THIS NOTE SHALL BE SUBJECT TO BINDING ARBITRATION BEFORE
THE NATIONAL ASSOCIATION OF SECURITIES DEALERS ("NASD") OR, IF FOR ANY REASON
INELIGIBLE, THE AMERICAN ARBITRATION ASSOCIATION ("ASA"), IN ACCORDANCE WITH THE
RULES OF PROCEDURE THEN IN EFFECT.  ANY ARBITRATION PROCEEDINGS SHALL TAKE PLACE
IN ATLANTA, GEORGIA AND BORROWER IRREVOCABLY SUBMITS AND CONSENTS TO THIS
ARBITRATION PROVISION AND VENUE.

          THE BORROWER AGREES THAT ALL OF ITS PAYMENT OBLIGATIONS HEREUNDER
SHALL BE ABSOLUTE, UNCONDITIONAL AND, FOR THE PURPOSES OF MAKING PAYMENTS
HEREUNDER, THE BORROWER HEREBY WAIVES ANY RIGHT TO ASSERT ANY SETOFF,
COUNTERCLAIM OR CROSS-CLAIM.

          No delay or failure on the part of the Holder in the exercise of any
right or remedy shall operate as a waiver thereof, and no single or partial
exercise by the Holder of any right or remedy shall preclude other or further
exercise thereof or the exercise of any other right or remedy.

          All amendments to this Note, and any waiver or consent of the Holder,
must be in writing and signed by the Holder and the Borrower.

          The Borrower hereby waives presentment, demand, notice of dishonor,
protests and all other notices whatever.

          THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF GEORGIA.

          This Note shall be binding upon the administrators, successors or
assigns of the Borrower.  A Holder of this Note may assign or transfer this Note
to any person or entity without notice to, or the consent of, the Borrower;
provided, this Note may not be assigned by the Borrower.

          Any notice to be given hereunder shall be in writing, shall be sent to
the Holder's address as specified in the first paragraph hereof or the
Borrower's addresses set forth below its signature hereto, as the case may be,
and shall be deemed received (i) on the earlier of the date of receipt or the
date three business days after deposit of such notice in the United States mail,
if sent postage prepaid, certified mail, return receipt requested or (ii) when
actually received, if personally delivered.

                            [Signature on Next Page]

                                      -8-
<PAGE>

          IN WITNESS WHEREOF, the Borrower has executed and delivered this
Promissory Note under seal as of the date and year first written above.

                                              MRY PARTNERS, L.P.

                                              By:  /s/ Robert A. Yellowlees
                                                   ----------------------------
                                                   Name: Robert A. Yellowlees
                                                   Title: General Partner

                                      -9-
<PAGE>

                                PROMISSORY NOTE

$1,675,503.21                                                Date: April 3, 2001

          FOR VALUE RECEIVED, the undersigned, MRY Partners, L.P., a Georgia
limited partnership (the "Borrower"), hereby unconditionally promises to pay to
the order of National Data Corporation (hereafter, together with any holder
hereof, the "Holder") at the offices of the Holder located at National Data
Plaza, Atlanta, Georgia 30329, or at such other place as the Holder may
designate in writing to the Borrower, in lawful money of the United States of
America, in immediately available funds, the principal sum of ONE MILLION FOUR
HUNDRED EIGHT-THREE THOUSAND FIVE HUNDRED THREE AND 21/100 DOLLARS
($1,483,503.21), together with interest on the principal balance from time to
time outstanding hereunder (computed on the basis of a 360-day year for the
actual number of days elapsed) from the date hereof until paid in full at a per
annum rate equal to 4.63% in simple interest terms.

          The principal balance shall be payable in full on June 1, 2003.
Accrued interest shall be payable annually on each April 3 during the term of
this Note.  Accrued interest shall also be due and payable on any date on which
the principal balance is due (whether by acceleration, maturity or otherwise)
other than any date on which a Collateral Sale Mandatory Prepayment is due.

          The Borrower shall prepay a portion of the outstanding principal
amount owing under this Note immediately following the settlement date with
respect to the sale, transfer or other disposition of a portion (but not all) of
the June 1, 1993 Option Securities (as such term is defined Schedule 1 to that
certain Stock Pledge Agreement dated as of the date hereof between the Borrower
and the Holder). Such prepayment shall be in an amount equal to the product of
(a) a fraction, (i) the numerator of which is the number of shares of such June
1, 1993 Option Securities so sold, transferred or disposed of, and (ii) the
denominator of which is the total number of shares of such June 1, 1993 Option
Securities owned by the Borrower immediately prior to such sale, transfer or
disposition, multiplied by (b) the unpaid principal amount of this note as of
such date (the "Collateral Sale Mandatory Prepayment"). Upon a sale, transfer or
other disposition of all of the June 1, 1993 Option Securities, the entire
principal balance hereunder and any accrued interest thereon shall become due
and payable immediately following the settlement date with respect to the sale,
transfer or other disposition.

          Interest shall accrue on any amount past due hereunder at a per annum
rate equal to 2.0% in excess of the interest rate otherwise payable hereunder.
All such interest shall be due and payable on demand.

          In no event shall the amount of interest due and payable under this
Note exceed the maximum rate of interest allowed by applicable law and, in the
event any such payment is inadvertently paid by the Borrower or inadvertently
received by the Holder, then such excess sum shall be credited as a payment of
principal, unless the Borrower shall notify the Holder in writing that the
Borrower elects to have such excess sum returned to it forthwith.  It is the
express intent of the parties hereto that the Borrower not pay and the Holder
not receive, directly or indirectly, in

                                      -10-
<PAGE>

any manner whatsoever, interest in excess of that which may be lawfully paid by
the Borrower under applicable law.

          THE BORROWER, AND THE HOLDER BY ACCEPTING THIS NOTE, EACH AGREES AND
STIPULATES THAT THE ONLY CHARGE IMPOSED UPON THE BORROWER FOR THE USE OF MONEY
IN CONNECTION WITH THIS NOTE IS AND SHALL BE THE INTEREST DESCRIBED IN THE FIRST
PARAGRAPH HEREOF, AND FURTHER AGREES AND STIPULATES THAT ALL OTHER CHARGES
IMPOSED BY THE HOLDER ON THE BORROWER IN CONNECTION WITH THIS NOTE, INCLUDING
WITHOUT LIMITATION, ALL DEFAULT CHARGES, LATE CHARGES AND ATTORNEYS' FEES, ARE
CHARGES MADE TO COMPENSATE THE HOLDER FOR ADMINISTRATIVE SERVICES AND COSTS OR
LOSSES INCURRED, AND TO BE INCURRED, BY THE HOLDER IN CONNECTION WITH THIS NOTE
AND SHALL UNDER NO CIRCUMSTANCES BE DEEMED TO BE CHARGES FOR THE USE OF MONEY
PURSUANT TO OFFICIAL CODE OF GEORGIA ANNOTATED SECTION 7-4-2 OR SECTION 7-4-18.
ALL CHARGES OTHER THAN CHARGES FOR THE USE OF MONEY SHALL BE FULLY EARNED AND
NONREFUNDABLE WHEN DUE.

          Each of the following events shall constitute an "Event of Default"
under this Note:  (i) failure of the Borrower to pay any principal, interest or
other amount due hereunder when due; (ii) the Borrower shall fail to comply with
any of the terms, covenants or conditions contained in this Note or in the Stock
Pledge Agreement dated as of the date hereof executed by the Borrower in favor
of the Holder (as amended, restated, supplemented or otherwise modified from
time to time, the "Pledge Agreement"); (iii) any written representation or
warranty made at any time by the Borrower to the Holder shall prove to have been
incorrect or misleading in any material respect when made; (iv) the institution
of bankruptcy proceedings against the Borrower or Robert A. Yellowlees and such
proceedings have not been dismissed on or before 60 days after the institution
thereof, the bankruptcy of the Borrower or Robert A. Yellowlees or the
commencement of a voluntary case by the Borrower or Robert A. Yellowlees under
the Bankruptcy Code of 1978, as amended or other federal bankruptcy law (as now
or hereafter in effect); (v) the Holder shall cease to have a valid and
perfected security interest in the Collateral (as defined in the Pledge
Agreement) for any reason other than the failure of the Holder to take any
action within its control; and (vi) the Holder shall reasonably determine that
the prospect of repayment under this Note is impaired.

          Upon the occurrence of an Event of Default (other than an Event of
Default described in clause (iv) of the definition thereof), the entire
outstanding principal balance of this Note, together with all accrued and unpaid
interest thereon, and all of the Borrower's other obligations owing hereunder,
at the option of the Holder, and without demand or notice of any kind, may be
immediately declared, and thereupon shall immediately become in default and due
and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise.  Upon the occurrence of an Event
of Default described in clause (iv) of the definition thereof, the entire
outstanding principal balance of this Note, together with all accrued and unpaid
interest thereon, and all of the Borrower's other obligations owing hereunder,
without demand or notice of any kind, shall immediately become in default and
due and payable and the Holder may exercise any and all rights and remedies
available to it at law, in equity or otherwise.

                                      -11-
<PAGE>

          The Borrower shall pay all expenses incurred by the Holder in the
collection of this Note, including, without limitation, the reasonable fees and
disbursements of counsel to the Holder if this Note is collected by or through
an attorney-at-law.

          Time is of the essence of this Note.

          EACH OF THE HOLDER AND THE BORROWER HEREBY AGREES THAT ANY ACTION OR
PROCEEDING RELATING TO THIS NOTE SHALL BE SUBJECT TO BINDING ARBITRATION BEFORE
THE NATIONAL ASSOCIATION OF SECURITIES DEALERS ("NASD") OR, IF FOR ANY REASON
INELIGIBLE, THE AMERICAN ARBITRATION ASSOCIATION ("ASA"), IN ACCORDANCE WITH THE
RULES OF PROCEDURE THEN IN EFFECT.  ANY ARBITRATION PROCEEDINGS SHALL TAKE PLACE
IN ATLANTA, GEORGIA AND BORROWER IRREVOCABLY SUBMITS AND CONSENTS TO THIS
ARBITRATION PROVISION AND VENUE.

          THE BORROWER AGREES THAT ALL OF ITS PAYMENT OBLIGATIONS HEREUNDER
SHALL BE ABSOLUTE, UNCONDITIONAL AND, FOR THE PURPOSES OF MAKING PAYMENTS
HEREUNDER, THE BORROWER HEREBY WAIVES ANY RIGHT TO ASSERT ANY SETOFF,
COUNTERCLAIM OR CROSS-CLAIM.

          No delay or failure on the part of the Holder in the exercise of any
right or remedy shall operate as a waiver thereof, and no single or partial
exercise by the Holder of any right or remedy shall preclude other or further
exercise thereof or the exercise of any other right or remedy.

          All amendments to this Note, and any waiver or consent of the Holder,
must be in writing and signed by the Holder and the Borrower.

          The Borrower hereby waives presentment, demand, notice of dishonor,
protests and all other notices whatever.

          THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF GEORGIA.

          This Note shall be binding upon the administrators, successors or
assigns of the Borrower.  A Holder of this Note may assign or transfer this Note
to any person or entity without notice to, or the consent of, the Borrower;
provided, this Note may not be assigned by the Borrower.

          Any notice to be given hereunder shall be in writing, shall be sent to
the Holder's address as specified in the first paragraph hereof or the
Borrower's addresses set forth below its signature hereto, as the case may be,
and shall be deemed received (i) on the earlier of the date of receipt or the
date three business days after deposit of such notice in the United States mail,
if sent postage prepaid, certified mail, return receipt requested or (ii) when
actually received, if personally delivered.

                            [Signature on Next Page]

                                      -12-
<PAGE>

          IN WITNESS WHEREOF, the Borrower has executed and delivered this
Promissory Note under seal as of the date and year first written above.

                                              MRY PARTNERS, L.P.

                                               By:  /s/ Robert A. Yellowlees
                                                    -------------------------
                                                    Name:  Robert A. Yellowlees
                                                    Title: General Partner

                                      -13-

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