BA MASTER CREDIT CARD TRUST /
8-K, 1998-06-02
ASSET-BACKED SECURITIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549



                                    FORM 8-K




                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


                                  May 15, 1998
                ------------------------------------------------
                Date of report (Date of earliest event reported)


                      Bank of America National Association
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)



                   U.S.A.               333-4152              86-0645265
       ----------------------------------------------------------------------
       (State or other jurisdiction   (Commission           (I.R.S. Employer
        of incorporation)             File Number)      Identification Number)


       1825 East Buckeye Road
       Phoenix, Arizona                                           85034
       ----------------------------------------------------------------------
       (Address of principal executive offices)                 (Zip Code)



                                  (602) 597-3738
      --------------------------------------------------------------------
              (Registrant's telephone number, including area code)

                                      N/A
      --------------------------------------------------------------------
         (Former Name or Former Address, if Changed Since Last Report)

<PAGE>

INFORMATION TO BE INCLUDED IN THE REPORT

Items 1-4. Not Applicable.

Item 5.    Not Applicable.

Item 6.    Not Applicable.

Item 7.    Exhibits.

           The following are filed as Exhibits to this Report under Exhibits
           20.1, 20.2, 20.3, 20.4, 20.5, 20.6, 20.7, 20.8, 20.9, 20.10,
           20.11, and 20.12.

           Exhibit 20.1  SERIES 1996-A - Monthly Payment Instructions and
                         Notification to the Trustee, dated as of April 30, 1998

           Exhibit 20.2  SERIES 1996-A - Monthly Certificateholders' Statement,
                         dated as of April 30, 1998

           Exhibit 20.3  SERIES 1996-A - Schedule to Monthly Servicers'
                         Certificate, dated as of April 30, 1998

           Exhibit 20.4  SERIES 1996-A - Monthly Servicer's Certificate, dated
                         as of April 30, 1998

           Exhibit 20.5  SERIES 1997-A - Monthly Payment Instructions and
                         Notification to the Trustee, dated as of April 30, 1998

           Exhibit 20.6  SERIES 1997-A - Monthly Certificateholders' Statement,
                         dated as of April 30, 1998

           Exhibit 20.7  SERIES 1997-A - Schedule to Monthly Servicer's
                         Certificate, dated as of April 30, 1998

           Exhibit 20.8  SERIES 1997-A - Monthly Servicer's Certificate, dated
                         as of April 30, 1998

           Exhibit 20.9  SERIES 1998-A - Monthly Payment Instructions and
                         Notification to the Trustee, dated as of April 30, 1998

           Exhibit 20.10 SERIES 1998-A - Monthly Certificateholders' Statement,
                         dated as of April 30, 1998

           Exhibit 20.11 SERIES 1998-A - Schedule to Monthly Servicer's
                         Certificate, dated as of April 30, 1998

           Exhibit 20.12 SERIES 1998-A - Monthly Servicer's Certificate, dated
                         as of April 30, 1998


<PAGE>

                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
as amended, the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned hereunto duly authorized.


                      BANK OF AMERICA NATIONAL ASSOCIATION
                                         
                      Transferor and Servicer

     

                      By /s/ MARGARET A. SPRUDE
                         ------------------------------
                         Name:   Margaret A. Sprude
                         Title:  SVP & Chief Financial Officer

Date:  May 25, 1998

<PAGE>

                               INDEX TO EXHIBITS

Exhibit
Number     Exhibit Description
- --------   -------------------

 20.1      SERIES 1996-A - Monthly Payment Instructions and Notification
           to the Trustee, dated as of April 30, 1998

 20.2      SERIES 1996-A - Monthly Certificateholders' Statement, dated as
           of April 30, 1998

 20.3      SERIES 1996-A - Schedule to Monthly Servicers' Certificate,
           dated as of April 30, 1998

 20.4      SERIES 1996-A - Monthly Servicer's Certificate, dated as of
           April 30, 1998

 20.5      SERIES 1997-A - Monthly Payment Instructions and Notification
           to the Trustee, dated as of April 30, 1998

 20.6      SERIES 1997-A - Monthly Certificateholders' Statement, dated as
           of April 30, 1998

 20.7      SERIES 1997-A - Schedule to Monthly Servicer's Certificate,
           dated as of April 30, 1998

 20.8      SERIES 1997-A - Monthly Servicer's Certificate, dated as of
           April 30, 1998

 20.9      SERIES 1998-A - Monthly Payment Instructions and Notification
           to the Trustee, dated as of April 30, 1998

 20.10     SERIES 1998-A - Monthly Certificateholders' Statement, dated as
           of April 30, 1998

 20.11     SERIES 1998-A - Schedule to Monthly Servicer's Certificate,
           dated as of April 30, 1998

 20.12     SERIES 1998-A - Monthly Servicer's Certificate, dated as of
           April 30, 1998



                  MONTHLY PAYMENT INSTRUCTIONS AND NOTIFICATION
                                 TO THE TRUSTEE
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1996-A
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------


                  Capitalized  terms used in this notice  have their  respective
meanings set forth in the Pooling and Servicing Agreement.  References herein to
certain  sections and subsections are references to the respective  sections and
subsections of the Pooling and Servicing Agreement as supplemented by the Series
1996-A Supplement. This notice is delivered pursuant to Section 4.09.
     
   A. Bank of America is the Servicer under the Pooling and Servicing Agreement.

   B. The undersigned is a Servicing Officer.

   C. The date of this notice is on or before the related  Transfer  Date under
      the Pooling and Servicing Agreement.

I.    INSTRUCTION TO MAKE A WITHDRAWAL

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee (i) to make  withdrawals  from the Finance Charge  Account,  the
    Principal  Account,  and the  Principal  Funding  Account on MAY 14, 1998,
                                                                 ------------
    which date is a Transfer Date under the Pooling and Servicing Agreement,  in
    aggregate  amounts set forth below in respect of the  following  amounts and
    (ii) to apply the proceeds of such withdrawals in accordance with subsection
    3 (a) of the Series  1996-A  Supplement  and Section 4.09 of the Pooling and
    Servicing Agreement:


A.    Pursuant to subsection 3 (a) of the Series 1996-A Supplement:

      1.    Servicer Interchange..................................$   416,666.67
                                                                   -------------

B.    Pursuant to subsection 4.09 (a) (i):

      1.    Class A Monthly Interest at the Class A
            Certificate Rate on the Class A Investor
            Interest..............................................$ 2,061,351.56
                                                                   -------------

      2.    Class A Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class A Additional Interest...........................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (a) (ii):

      1.    Class A Servicing Fee.................................$   356,250.00
                                                                   -------------

      2.    Accrued and unpaid Class A Servicing Fee..............$         0.00
                                                                   -------------

D.    Pursuant to subsection 4.09 (a) (iii):

      1.    Class A Investor Default Amount.......................$ 2,576,658.54
                                                                   -------------

E.    Pursuant to subsection 4.09 (a) (iv):

      1.    Portion of Excess Spread from Class A
            Available Funds to be allocated and,
            distributed as provided in Section 4.11...............$ 1,675,812.29
                                                                   -------------

F.    Pursuant to subsection 4.09 (b) (i):

      1.    Class B Monthly Interest at the Class B
            Certificate Rate on the Class B Investor
            Interest..............................................$   161,044.27
                                                                   -------------

      2.    Class B Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class B Additional Interest...........................$         0.00
                                                                   -------------

G.    Pursuant to subsection 4.09 (b) (ii):

      1.    Class B Servicing Fee.................................$    27,083.33
                                                                   -------------

      2.    Accrued and unpaid Class B Servicing Fee..............$         0.00
                                                                   -------------

H.    Pursuant to subsection 4.09 (b) (iii):

      1.    Portion of Excess Spread from Class B
            Available Funds to be allocated and
            distributed as provided in Section 4.11...............$   318,953.92
                                                                   -------------

I.    Pursuant to subsection 4.09 (c) (i):

      1.    Collateral Interest Servicing Fee, if
            applicable............................................$          N/A
                                                                   -------------

      2.    Accrued and unpaid Collateral Interest
            Servicing Fee, if applicable..........................$          N/A
                                                                   -------------

J.    Pursuant to subsection 4.09 (c) (ii):

      1.    Portion of Excess Spread from Collateral 
            Available  Funds to be allocated and
            distributed as provided  in  Section 4.11.............$   624,100.34
                                                                   -------------

            Total.................................................$ 8,217,920.92
                                                                   =============

K.    Pursuant to subsection 4.09 (d) (ii):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

L.    Pursuant to subsection 4.09 (d) (iii):

      1.    Amount to be  paid to the  Holder of  the
            Transferor Certificate................................$67,175,219.54
                                                                   -------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

M.    Pursuant to subsection 4.09 (e) (i):

      1.    Class A Monthly Principal.............................$         0.00
                                                                   -------------

N.    Pursuant to subsection 4.09 (e) (ii):

      1.    Class B Monthly Principal.............................$         0.00
                                                                   -------------

O.    Pursuant to subsection 4.09 (e) (iii)

      1.    Collateral Monthly Principal to be applied
            in accordance with the Loan Agreement.................$         0.00
                                                                   -------------

P.    Pursuant to subsection 4.09 (e) (iv):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

Q.    Pursuant to subsection 4.09 (e) (v):

      1.    Amount to be paid to the Holder of the
            Transferor Certificate................................$         0.00
                                                                   -------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

R.    Pursuant to subsection 4.09 (f):

      1.    Amount to be withdrawn from the Principal
            Funding Account and deposited into the
            Distribution Account..................................$         0.00
                                                                   -------------

S.    Pursuant to Section 4.13:

      1.    Amount of Shared Excess Finance Charge
            Collections to be withdrawn from the
            Finance Charge account to be allocated to
            Series 1996-A and distributed as provided
            in Section 4.11.......................................$         0.00
                                                                   -------------


II.   INSTRUCTION TO MAKE CERTAIN PAYMENTS

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee to pay in accordance with Section 5.01 from the Distribution
    Account on MAY 15,  1998,  which date is a  Distribution  Date under the
               -------------
    Pooling  and Servicing  Agreement,  amounts so deposited in the Distribution
    Account pursuant to Section 4.09 as set forth below:

A.    Pursuant to subsection 4.09 (g):

      1.    Amount to be distributed to Class A 
            Certificateholders....................................$ 2,061,351.56
                                                                   -------------

      2.    Amount to be distributed to Class B 
            Certificateholders....................................$   161,044.27
                                                                   -------------

B.    Pursuant to subsection 4.09 (h) (i):

      1.    Amount to be distributed to Class A
            Certificateholders....................................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (h) (ii):

      1.      Amount to be distributed to the  Class B
              Certificateholders..................................$         0.00
                                                                   -------------


III.     APPLICATION OF EXCESS SPREAD

           Pursuant to Section 4.11,  the Servicer  does hereby  instruct the
    Trustee to apply the Excess  Spread  with  respect to the  related  Monthly
    Period and to make the following distributions in the following priority:

A.    The amount equal to the Class A Required Amount,
      if any, which will be used to fund the Class A
      Required Amount and be applied in accordance
      with, and in the priority set forth in,
      subsection 4.09 (a).........................................$         0.00
                                                                   -------------

B.    The amount equal to the  aggregate  amount of
      Class A Investor Charge Offs which have not been
      previously  reimbursed  (after giving  effect  to
      the  allocation  on such  Transfer  Date of certain
      other amounts  applied for that purpose) which
      will be treated as a portion of  Investor
      Principal  Collections  and deposited into the
      Principal Account on such Transfer Date.....................$         0.00
                                                                   -------------

C.    The amount equal to the Class B Required
      Amount, if any, which will be  used to fund  the
      Class  B  Required  Amount  and be applied  first
      in  accordance  with,  and in the  priority set
      forth in, subsection  4.09(b) and then any
      amount available to pay the Class B Investor
      Default Amount shall be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$   195,886.32
                                                                   -------------


D.    The amount equal to the aggregate  amount by
      which the Class B Investor Interest has been
      reduced  below the initial Class B Investor
      Interest for reasons other than the payment of
      principal to the Class B Certificateholders
      (but not in excess of the aggregate amount of
      such reductions which have not been previously
      reimbursed)  which will be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$         0.00
                                                                   -------------


E.    The amount equal to the Collateral  Monthly
      Interest plus the amount of any past due
      Collateral  Monthly Interest which will be paid
      to the Collateral  Interest  Holder for
      application in accordance with the Loan Agreement...........$   201,875.00
                                                                   -------------


F.    The amount equal to the aggregate amount of
      accrued but unpaid Collateral  Interest
      Servicing Fees which will be paid to the
      Servicer if the Transferor or an Acceptable
      Successor Servicer is the Servicer..........................$    33,333.34
                                                                   -------------

G.    The amount equal to the Collateral Default
      Amount, if any, for the prior Monthly Period
      which will be treated as a portion of Investor
      Principal Collections and deposited into the
      Principal Account...........................................$   241,090.86
                                                                   -------------

H.    The  amount  equal  to  the  aggregate  amount
      by  which  the Collateral  Interest  has  been
      reduced  below  the  Required Collateral  Interest
      for  reasons  other than the  payment of principal
      to the Collateral Interest Holder (but not in excess
      of the aggregate amount of such reductions which
      have not been previously  reimbursed)  which will
      be treated as a portion of Investor Principal
      Collections and deposited into the Principal Account........$         0.00
                                                                   -------------

I.    On each  Transfer  Date  from and after  the
      Reserve  Account Funding  Date,  but  prior to
      the date on  which  the  Reserve Account
      terminates as described in  subsection  4.16 (f),
      the amount  up to the  excess,  if any,  of the
      Required  Reserve Account Amount over the
      Available Reserve Account Amount which shall be
      deposited into the Reserve Account..........................$         0.00
                                                                   -------------

J.    The balance,  if any, after giving effect to
      the payments made pursuant to subparagraphs (a)
      through (i) above which shall be deposited  into
      the  Distribution   Account  and  applied  in
      accordance with the provisions of the Loan Agreement........$ 1,946,681.03
                                                                   -------------


IV.    REALLOCATED PRINCIPAL COLLECTIONS

            Pursuant to Section 4.12,  the Servicer  does hereby  instruct
    the  Trustee  to  withdraw  from the  Principal  Account  and apply
    Reallocated Principal  Collections  pursuant  to Section  4.12 with  respect
    to the  related Monthly Period in the following amounts:

A.    Reallocated Collateral Principal Receivables................$         0.00
                                                                   -------------

B.    Reallocated Class B Principal Receivables...................$         0.00
                                                                   -------------


V.    ACCRUED AND UNPAID AMOUNTS

            After giving effect to the withdrawals and transfers to be made in
    accordance with this notice, the following amounts will be accrued and
    unpaid with respect to all Monthly Periods preceding the current calendar
    month.

A.    Subsections 4.09 (a) (i) and (b) (i) :

      1.  The aggregate amount of the Class A
          Deficiency Amount.......................................$         0.00
                                                                   -------------

      2.  The aggregate amount of Class B Deficiency
          Amount..................................................$         0.00
                                                                   -------------

B.    Subsections 4.09 (a) (ii) and (b) (ii):

      1.  The aggregate amount of all accrued and
          unpaid Investor Monthly Servicing Fees..................$         0.00
                                                                   -------------

C.    Section 4.10:

      1.  The aggregate amount of all unreimbursed
          Investor Charge Offs....................................$         0.00
                                                                   -------------




IN WITNESS WHEREOF, the undersigned has duly executed this certificate this
12th day of MAY, 1998.
- ----        ---------


                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer


                                      By:  /s/ MARGARET A. SPRUDE
                                           ----------------------   
                                           Name:  Margaret A. Sprude
                                           Title: SVP & Chief Financial Officer



              MONTHLY SERIES 1996-A CERTIFICATEHOLDERS' STATEMENT
              ---------------------------------------------------

                                 Series 1996-A

                      BANK OF AMERICA NATIONAL ASSOCIATION
- --------------------------------------------------------------------------------

                          BA MASTER CREDIT CARD TRUST
- --------------------------------------------------------------------------------

         The  information  which is required to be prepared  with respect to the
Distribution  Date of MAY 15, 1998, and with respect to the performance of the
                      ------------
Trust during the related Monthly Period.

         Capitalized terms used in this Statement have their respective meanings
set forth in the Pooling and Servicing Agreement.

     A.  Information Regarding the Current Monthly Distribution (Stated on the
         ---------------------------------------------------------------------
         Basis of $1,000 Original Certificate Principal Amount)
         ------------------------------------------------------

         1.  The amount of the current monthly distribution
             in respect of Class A Monthly Principal...........$         0.00000
                                                                ----------------

         2.  The amount of the current monthly distribution
             in respect of Class B Monthly Principal...........$         0.00000
                                                                ----------------

         3.  The amount of the current monthly distribution
             in respect of Collateral Monthly Principal........$         0.00000
                                                                ----------------

         4.  The amount of the current monthly distribution
             in respect of Class A Monthly Interest............$         4.82187
                                                                ----------------

         5.  The amount of the current monthly distribution
             in respect of Class A Deficiency Amounts..........$         0.00000
                                                                ----------------

         6.  The amount of the current monthly distribution
             in respect of Class A Additional Interest.........$         0.00000
                                                                ----------------

         7.  The amount of the current monthly distribution
             in respect of Class B Monthly Interest............$         4.95521
                                                                ----------------

         8.  The amount of the current monthly distribution
             in respect of Class B Deficiency Amounts..........$         0.00000
                                                                ----------------

         9.  The amount of the current monthly distribution
             in respect of Class B Additional Interest.........$         0.00000
                                                                ----------------

        10.  The amount of the current monthly distribution
             in respect of Collateral Monthly Interest.........$         5.04688
                                                                ----------------

        11.  The amount of the current monthly distribution
             in respect of any accrued and unpaid Collateral
             Monthly Interest..................................$         0.00000
                                                                ----------------

     B.  Information Regarding the Performance of the Trust

         1.  Collection of Principal Receivables

             (a) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related Monthly Period which were
                 allocated in respect of the Class A
                 Certificates..................................$   54,858,154.17
                                                                ----------------

             (b) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related  Monthly Period which were
                 allocated in respect of the Class B
                 Certificates..................................$    4,170,502.95
                                                                ----------------

             (c) The aggregate amount of Collections of
                 Principal Receivables processed during
                 the related Monthly Period which were
                 allocated in respect of the Collateral
                 Interest......................................$    5,132,926.70
                                                                ----------------

         2.  Principal Receivables in the Trust

             (a) The aggregate amount of Principal
                 Receivables in the Trust as of the end
                 of the day on the last day of the
                 related Monthly Period........................$6,201,942,257.19
                                                                ----------------

             (b) The amount of Principal Receivables in
                 the Trust represented by the Investor
                 Interest of Series 1996-A as of the end
                 of the day on the last day of the related
                 Monthly Period................................$  500,000,000.00
                                                                ----------------

             (c) The amount of Principal Receivables in
                 the Trust represented by the Series
                 1996-A Adjusted Investor Interest as of
                 the end of day on the last day of the
                 related Monthly Period.......... .............$  500,000,000.00
                                                                ----------------

             (d) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$  427,500,000.00
                                                                ----------------

             (e) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Adjusted Investor Interest as of the end
                 of day on the last day of the related
                 Monthly Period................................$  427,500,000.00
                                                                ----------------

             (f) The amount of Principal Receivables in
                 the Trust represented by the Class B
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$   32,500,000.00
                                                                ----------------

             (g) The amount of Principal Receivables in
                 the Trust represented by the Collateral
                 Interest as of the end of the day on the
                 last day of the related Monthly Period........$   40,000,000.00
                                                                ----------------

             (h) The Floating Investor Percentage with
                 respect to the related Monthly Period.........          8.0147%
                                                                ----------------

             (i) The Class A Floating Allocation with
                 respect to the related Monthly Period.........           85.50%
                                                                ----------------

             (j) The Class B Floating Allocation with
                 respect to the related Monthly Period.........            6.50%
                                                                ----------------

             (k) The Collateral Floating Allocation with
                 respect to the related Monthly Period.........            8.00%
                                                                ----------------

             (l) The Fixed Investor Percentage with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

             (m) The Class A Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (n) The Class B Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (o) The Collateral Fixed Allocation with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

         3.  Delinquent Balances
             -------------------

             The aggregate amount of outstanding balances in the
             Accounts which were delinquent as of the end of the
             day on the last day of the related Monthly Period:

                                             Aggregate             Percentage of
                                              Account                  Total
                                              Balance               Receivables
                                             ---------             -------------

             (a)  31 - 60 days            $109,921,198.32             1.7434%
             (b)  61 - 90 days            $ 69,582,902.40             1.1036%
             (c)  91 - or more days       $123,864,202.97             1.9645%
             Total....................... $303,368,303.69             4.8116%

         4.  Investor Default Amount
             -----------------------

             (a) The Aggregate Investor Default Amount
                 for the related Monthly Period................$    3,013,635.72
                                                                ----------------

             (b) The Class A Investor Default Amount
                 for the related Monthly Period................$    2,576,658.54
                                                                ----------------

             (c) The Class B Investor Default Amount
                 for the related Monthly Period................$      195,886.32
                                                                ----------------

             (d) The Collateral Default Amount for
                 the related Monthly Period....................$      241,090.86
                                                                ----------------

         5.  Investor Charge Offs
             --------------------

             (a) The aggregate amount of Class A
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (b) The aggregate amount of Class A
                 Investor Charge Offs set forth in
                 5(a) above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (c) The aggregate amount of Class B
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (d) The aggregate amount of Class B
                 Investor Charge Offset forth in 5(c)
                 above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (e) The aggregate amount of Collateral
                 Charge Offs for the related Monthly
                 Period........................................$            0.00
                                                                ----------------

             (f) The aggregate amount of Collateral
                 Charge Offs set forth in 5(e)  above
                 per  $1,000 of original certificate
                 principal amount..............................$            0.00
                                                                ----------------

             (g) The aggregate amount of Class A
                 Investor Charge Offs reimbursed on
                 the Transfer Date immediately preceding
                 this Distribution Date .......................$            0.00
                                                                ----------------

             (h) The aggregate amount of Class A
                 Investor Charge  Offs  set  forth
                 in 5(g)  above  per $1,000 original
                 certificate principal amount
                 reimbursed on the Transfer Date
                 immediately preceding this Distribution
                 Date..........................................$            0.00
                                                                ----------------

             (i) The aggregate amount of Class B
                 Investor Charge Offs  reimbursed
                 on the Transfer Date immediately
                 preceding this Distribution Date .............$            0.00
                                                                ----------------

             (j) The aggregate amount of Class B
                 Investor Charge Offs set forth
                 in 5(i)  above  per $1,000 original
                 certificate principal amount reimbursed
                 on the Transfer Date  immediately
                 preceding this Distribution Date..............$            0.00
                                                                ----------------

             (k) The aggregate amount of Collateral
                 Charge Offs reimbursed on the Transfer
                 Date immediately preceding this
                 Distribution Date.............................$            0.00
                                                                ----------------

             (l) The aggregate amount of Collateral
                 Charge Offs set forth in 5(k) above
                 per $1,000 original certificate
                 principal amount reimbursed on the
                 Transfer Date immediately preceding
                 Distribution Date.............................$            0.00
                                                                ----------------

         6.  Investor Servicing Fee
             ----------------------

             (a) The amount of the Class A Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly
                 Period........................................$      356,250.00
                                                                ----------------

             (b) The amount of the Class B Servicing
                 Fee payable by the Trust to the 
                 Servicer for the related Monthly
                 Period........................................$       27,083.33
                                                                ----------------

             (c) The amount of the Collateral Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly Period.......$       33,333.34
                                                                ----------------

             (d) The amount of Servicer Interchange
                 payable by the Trust to the Servicer
                 for the related Monthly Period................$      416,666.67
                                                                ----------------

         7.  Reallocations
             -------------

             (a) The amount of Reallocated Collateral
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (b) The amount of Reallocated Class B
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (c) The Collateral Interest as of the
                 close of business on this Distribution
                 Date..........................................$   40,000,000.00
                                                                ----------------

             (d) The Class B Investor Interest as
                 of the close of business on this
                 Distribution Date.............................$   32,500,000.00
                                                                ----------------

         8.  Collection of Finance Charge Receivables
             ----------------------------------------

             (a) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period  which  were allocated in
                 respect of the Class A Certificates...........$    6,670,072.39
                                                                ----------------

             (b) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period which were allocated in respect
                 of the Class B Certificates...................$      507,081.52
                                                                ----------------

             (c) The aggregate  amount of Collections of
                 Finance Charge Receivables  processed
                 during the related Monthly Period which
                 were allocated in respect of the
                 Collateral Interest...........................$      624,100.34
                                                                ----------------

         9.  Principal Funding Account
             -------------------------

             (a) The principal amount on deposit in the
                 Principal Funding Account on the
                 related Transfer Date.........................$            0.00
                                                                ----------------

             (b) The Accumulation Shortfall with respect
                 to the related Monthly Period.................$            0.00
                                                                ----------------

             (c) The Principal Funding Investment
                 Proceeds deposited in the Finance
                 Charge Account on the related
                 Transfer Date.................................$            0.00
                                                                ----------------

             (d) The Principal Funding Investment
                 Shortfall.....................................$            0.00
                                                                ----------------

             (e) The amount of all or  the portion of
                 the Reserve Draw Amount deposited in
                 the Finance Charge Account on the
                 related Transfer Date from the Reserve
                 Account.......................................$            0.00
                                                                ----------------

        10.  Reserve Draw Amount...............................$            0.00
             -------------------                                ----------------

        11.  Available Funds
             ---------------

             (a) The amount of Class A Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$    6,670,072.39
                                                                ----------------

             (b) The amount of Class B Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$      507,081.52
                                                                ----------------

             (c) The amount of Collateral Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$      624,100.34
                                                                ----------------

        12.  Portfolio Yield
             ---------------

             (a) The Portfolio Yield (Net) for the
                 related Monthly Period........................         12.4903%
                                                                ----------------

             (b) The Portfolio Adjusted Yield for
                 the related Monthly Period....................          4.1720%
                                                                ----------------

     C.  Floating Rate Determinations
         ----------------------------

         1.  LIBOR for the Interest Period ending on
             this Distribution Date.............................        5.65625%
                                                                ----------------

         2.  Class A Certificate Rate...........................        5.78625%
                                                                ----------------

             Class B Certificate Rate...........................        5.94625%
                                                                ----------------


                                BANK OF AMERICA NATIONAL ASSOCIATION

                                Transferor and Servicer



                                By: \s\ MARGARET A. SPRUDE
                                    ------------------------------------
                                    Name:  Margaret A. Sprude
                                    Title: SVP & Chief Financial Officer



                   SCHEDULE TO MONTHLY SERVICER'S CERTIFICATE
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1996-A


      1.  The aggregate amount of the Investor Percentage
          of Collections of Principal Receivables................$ 64,161,583.82
                                                                  --------------

      2.  The aggregate amount of the Investor Percentage
          of Collections of Finance Charge Receivables
          (excluding Interchange)................................$  7,457,544.24
                                                                  --------------

      3.  The aggregate amount of the Investor Percentage
          of Interchange.........................................$    760,376.68
                                                                  --------------

      4.  The aggregate amount of Servicer Interchange...........$    416,666.67
                                                                  --------------

      5.  The aggregate amount of funds on deposit in
          Finance Charge Account allocable to the Series
          1996-A Certificates................................... $  7,801,254.25
                                                                  --------------

      6.  The aggregate amount of funds on deposit in
          the Principal Account allocable to the Series
          1996-A  Certificates...................................$ 64,161,583.82
                                                                  --------------

      7.  The aggregate amount of funds on deposit in
          the Principal Funding Account allocable to
          the Series 1996-A Certificates.........................$          0.00
                                                                  --------------

      8.  The aggregate amount to be withdrawn from the
          Finance Charge Account and paid in accordance
          with the Loan Agreement pursuant to Section 4.11.......$          0.00
                                                                  --------------

      9.  The excess, if any, of the Required Collateral
          Interest over the Collateral Interest..................$          0.00
                                                                  --------------

     10.  The Collateral Interest on the Transfer Date
          of the current calendar month, after giving
          effect to the deposits and withdrawals specified
          above, is equal to.....................................$ 40,000,000.00
                                                                  --------------

     11. The amount of Monthly Interest, Deficiency
         Amounts and Additional Interest payable to the
         (i)  Class A Certificateholders.........................$  2,061,351.56
                                                                  --------------

         (ii) Class B Certificateholders.........................$    161,044.27
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    201,875.00
                                                                  --------------

     12. The amount of principal payable to the
         (i)  Class A Certificateholders.........................$          0.00
                                                                  --------------

         (ii) Class B Certificateholders.........................$          0.00
                                                                  --------------

         (iii)Collateral Interest Holder.........................$          0.00
                                                                  --------------

     13. The sum of all amounts payable to the
         (i)  Class A Certificateholders.........................$  2,061,351.56
                                                                  --------------

         (ii) Class B Certificateholders ........................$    161,044.27
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    201,875.00
                                                                  --------------

     14. To the knowledge of the undersigned, no Series
         1996-A  Pay Out  Event or  Trust  Pay Out  Event
         has occurred except as described below:

                                    None



                   IN WITNESS WHEREOF, the undersigned has duly executed
          and delivered this Certificate this 12th day of MAY, 1998.
                                              ----        ---------

                                 BANK OF AMERICA NATIONAL ASSOCIATION

                                 Transferor and Servicer


                                 By:  /s/ MARGARET A. SPRUDE
                                      --------------------------------------
                                      Name: Margaret A. Sprude
                                      Title:   SVP & Chief Financial Officer



                         MONTHLY SERVICER'S CERTIFICATE
                         ------------------------------
                      (This represents Series 1996-A only)

                      Monthly Period Ending APRIL 30, 1998
                                            --------------
                      Bank of America National Association
                      ------------------------------------

                           BA MASTER CREDIT CARD TRUST
                           ---------------------------


                  1. Capitalized  terms  used in this  Certificate  have  their
respective meanings set forth in the Pooling and Servicing Agreement;  provided,
                                                                       --------
that the "preceding  Monthly  Period" shall mean the Monthly Period  immediately
preceding  the  calendar  month in which this  Certificate  is  delivered.  This
Certificate  is  delivered  pursuant to  subsection  3.04 (b) of the Pooling and
Servicing  Agreement.  References herein to certain sections and subsections are
references  to the  respective  sections  and  subsections  of the  Pooling  and
Servicing Agreement.

                  2. Bank of America National  Association is Servicer under the
Pooling and Servicing Agreement.

                  3. The undersigned is a Servicing Officer.

                  4. The date of this Certificate is a Determination  Date under
the Pooling and Servicing Agreement.

                  5. The aggregate amount of Collections
processed during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange)...............$889,759,970.54
                                                                  --------------

                  6. The Aggregate Investor Percentage of
Receivables processed by the Servicer during the preceding
Monthly Period was equal to......................................$ 71,999,701.90
                                                                  --------------

                  7. The Aggregate Investor Percentage of
Collections of Finance Charge Receivables processed by the
Servicer during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange)...............$  7,322,024.01
                                                                  --------------

                  8. The aggregate amount of Receivables
processed by the Servicer as of the end of the last day
of the preceding Monthly Period..................................$898,345,563.74
                                                                  --------------

                  9. Of the  balance on deposit in the
Finance  Charge  Account, the amount  attributable  to
the Aggregate  Investor  Percentage of  Collections
processed by the Servicer during the preceding Monthly
Period ..........................................................$  8,217,920.92
                                                                  --------------

                  10. Of the balance on deposit in the
Principal  Account,  the amount   attributable  to  the
Aggregate  Investor  Percentage  of  Collections
processed by the Servicer during the preceding Monthly
Period...........................................................$ 64,161,583.82
                                                                  --------------

                  11. The aggregate amount, if any, of
withdrawals, drawings or payments under any Credit
Enhancement, if any, required to be made with respect to
any Series outstanding for the preceding Monthly Period..........$          0.00
                                                                  --------------

                  12. The Aggregate Investor Percentage
of  Collections  of Principal  Receivables  processed
by the  Servicer  during the related  Monthly Period is
equal to.........................................................$ 64,161,583.82
                                                                  --------------

                  13. The amount equal to the Aggregate
Investor Percentage of Annual Membership Fees deposited
to the Finance Charge Account or any Series Account on
or before the Transfer Date during the current month is
equal to.........................................................$    135,520.23
                                                                  --------------

                  14. The aggregate amount of Interchange
to be deposited in the Finance Charge Account on the
Transfer Date of the current month is equal to...................$    760,376.68
                                                                  --------------

                  15. The aggregate amount of all sums
payable to the Investor Certificateholder of each Series
on the succeeding Distribution Date with respect to
Certificate Principal............................................$          0.00
                                                                  --------------

                  16. The aggregate amount of all sums
payable to the Investor Certificateholder of each
Series on the succeeding Distribution Date with respect
to Certificate Interest..........................................$  2,424,270.83
                                                                  --------------

                  17. The aggregate amount of Default
Amounts processed by the Servicer as of the end of the
last day of the preceding Monthly Period.........................$ 37,601,354.03
                                                                  --------------

                  18. To the knowledge of the undersigned, there are no Liens on
any Receivables in the Trust except as described below:

                                      None



                  IN WITNESS  WHEREOF,  the  undersigned  has duly  executed and
delivered this certificate this 12th day of MAY, 1998.
                                ----        -----------

                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer

                                     By:  /s/ MARGARET A. SPRUDE
                                          -----------------------------
                                          Name:  Margaret A. Sprude
                                          Title: SVP & Chief Financial Officer



                  MONTHLY PAYMENT INSTRUCTIONS AND NOTIFICATION
                                 TO THE TRUSTEE
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1997-A
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------


                  Capitalized  terms used in this notice  have their  respective
meanings set forth in the Pooling and Servicing Agreement.  References herein to
certain  sections and subsections are references to the respective  sections and
subsections of the Pooling and Servicing Agreement as supplemented by the Series
1997-A Supplement. This notice is delivered pursuant to Section 4.09.
     
   A. Bank of America is the Servicer under the Pooling and Servicing Agreement.

   B. The undersigned is a Servicing Officer.

   C. The date of this notice is on or before the related  Transfer  Date under
      the Pooling and Servicing Agreement.

I.    INSTRUCTION TO MAKE A WITHDRAWAL

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee (i) to make  withdrawals  from the Finance Charge  Account,  the
    Principal  Account,  and the  Principal  Funding  Account on MAY 14, 1998,
                                                                 ------------
    which date is a Transfer Date under the Pooling and Servicing Agreement,  in
    aggregate  amounts set forth below in respect of the  following  amounts and
    (ii) to apply the proceeds of such withdrawals in accordance with subsection
    3 (a) of the Series  1997-A  Supplement  and Section 4.09 of the Pooling and
    Servicing Agreement:


A.    Pursuant to subsection 3 (a) of the Series 1997-A Supplement:

      1.    Servicer Interchange..................................$   625,000.00
                                                                   -------------

B.    Pursuant to subsection 4.09 (a) (i):

      1.    Class A Monthly Interest at the Class A
            Certificate Rate on the Class A Investor
            Interest..............................................$ 3,117,378.91
                                                                   -------------

      2.    Class A Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class A Additional Interest...........................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (a) (ii):

      1.    Class A Servicing Fee.................................$   540,625.00
                                                                   -------------

      2.    Accrued and unpaid Class A Servicing Fee..............$         0.00
                                                                   -------------

D.    Pursuant to subsection 4.09 (a) (iii):

      1.    Class A Investor Default Amount.......................$ 3,910,208.61
                                                                   -------------

E.    Pursuant to subsection 4.09 (a) (iv):

      1.    Portion of Excess Spread from Class A
            Available Funds to be allocated and,
            distributed as provided in Section 4.11...............$ 2,553,959.21
                                                                   -------------

F.    Pursuant to subsection 4.09 (b) (i):

      1.    Class B Monthly Interest at the Class B
            Certificate Rate on the Class B Investor
            Interest..............................................$   204,402.34
                                                                   -------------

      2.    Class B Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class B Additional Interest...........................$         0.00
                                                                   -------------

G.    Pursuant to subsection 4.09 (b) (ii):

      1.    Class B Servicing Fee.................................$    34,375.00
                                                                   -------------

      2.    Accrued and unpaid Class B Servicing Fee..............$         0.00
                                                                   -------------

H.    Pursuant to subsection 4.09 (b) (iii):

      1.    Portion of Excess Spread from Class B
            Available Funds to be allocated and
            distributed as provided in Section 4.11...............$   404,828.96
                                                                   -------------

I.    Pursuant to subsection 4.09 (c) (i):

      1.    Collateral Interest Servicing Fee, if
            applicable............................................$          N/A
                                                                   -------------

      2.    Accrued and unpaid Collateral Interest
            Servicing Fee, if applicable..........................$          N/A
                                                                   -------------

J.    Pursuant to subsection 4.09 (c) (ii):

      1.    Portion of Excess Spread from Collateral 
            Available  Funds to be allocated and
            distributed as provided  in  Section 4.11.............$   936,154.61
                                                                   -------------

            Total.................................................$12,326,932.64
                                                                   =============

K.    Pursuant to subsection 4.09 (d) (ii):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

L.    Pursuant to subsection 4.09 (d) (iii):

      1.    Amount to be  paid to the  Holder of  the
            Transferor Certificate...............................$100,763,248.38
                                                                  --------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

M.    Pursuant to subsection 4.09 (e) (i):

      1.    Class A Monthly Principal.............................$         0.00
                                                                   -------------

N.    Pursuant to subsection 4.09 (e) (ii):

      1.    Class B Monthly Principal.............................$         0.00
                                                                   -------------

O.    Pursuant to subsection 4.09 (e) (iii)

      1.    Collateral Monthly Principal to be applied
            in accordance with the Loan Agreement.................$         0.00
                                                                   -------------

P.    Pursuant to subsection 4.09 (e) (iv):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

Q.    Pursuant to subsection 4.09 (e) (v):

      1.    Amount to be paid to the Holder of the
            Transferor Certificate................................$         0.00
                                                                   -------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

R.    Pursuant to subsection 4.09 (f):

      1.    Amount to be withdrawn from the Principal
            Funding Account and deposited into the
            Distribution Account..................................$         0.00
                                                                   -------------

S.    Pursuant to Section 4.13:

      1.    Amount of Shared Excess Finance Charge
            Collections to be withdrawn from the
            Finance Charge account to be allocated to
            Series 1997-A and distributed as provided
            in Section 4.11.......................................$         0.00
                                                                   -------------


II.   INSTRUCTION TO MAKE CERTAIN PAYMENTS

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee to pay in accordance with Section 5.01 from the Distribution
    Account on MAY 15,  1998,  which date is a  Distribution  Date under the
               -------------
    Pooling  and Servicing  Agreement,  amounts so deposited in the Distribution
    Account pursuant to Section 4.09 as set forth below:

A.    Pursuant to subsection 4.09 (g):

      1.    Amount to be distributed to Class A 
            Certificateholders....................................$ 3,117,378.91
                                                                   -------------

      2.    Amount to be distributed to Class B 
            Certificateholders....................................$   204,402.34
                                                                   -------------

B.    Pursuant to subsection 4.09 (h) (i):

      1.    Amount to be distributed to Class A
            Certificateholders....................................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (h) (ii):

      1.      Amount to be distributed to the  Class B
              Certificateholders..................................$         0.00
                                                                   -------------


III.     APPLICATION OF EXCESS SPREAD

           Pursuant to Section 4.11,  the Servicer  does hereby  instruct the
    Trustee to apply the Excess  Spread  with  respect to the  related  Monthly
    Period and to make the following distributions in the following priority:

A.    The amount equal to the Class A Required Amount,
      if any, which will be used to fund the Class A
      Required Amount and be applied in accordance
      with, and in the priority set forth in,
      subsection 4.09 (a).........................................$         0.00
                                                                   -------------

B.    The amount equal to the  aggregate  amount of
      Class A Investor Charge Offs which have not been
      previously  reimbursed  (after giving  effect  to
      the  allocation  on such  Transfer  Date of certain
      other amounts  applied for that purpose) which
      will be treated as a portion of  Investor
      Principal  Collections  and deposited into the
      Principal Account on such Transfer Date.....................$         0.00
                                                                   -------------

C.    The amount equal to the Class B Required
      Amount, if any, which will be  used to fund  the
      Class  B  Required  Amount  and be applied  first
      in  accordance  with,  and in the  priority set
      forth in, subsection  4.09(b) and then any
      amount available to pay the Class B Investor
      Default Amount shall be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$   248,625.98
                                                                   -------------


D.    The amount equal to the aggregate  amount by
      which the Class B Investor Interest has been
      reduced  below the initial Class B Investor
      Interest for reasons other than the payment of
      principal to the Class B Certificateholders
      (but not in excess of the aggregate amount of
      such reductions which have not been previously
      reimbursed)  which will be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$         0.00
                                                                   -------------


E.    The amount equal to the Collateral  Monthly
      Interest plus the amount of any past due
      Collateral  Monthly Interest which will be paid
      to the Collateral  Interest  Holder for
      application in accordance with the Loan Agreement...........$   305,312.50
                                                                   -------------


F.    The amount equal to the aggregate amount of
      accrued but unpaid Collateral  Interest
      Servicing Fees which will be paid to the
      Servicer if the Transferor or an Acceptable
      Successor Servicer is the Servicer..........................$    50,000.00
                                                                   -------------

G.    The amount equal to the Collateral Default
      Amount, if any, for the prior Monthly Period
      which will be treated as a portion of Investor
      Principal Collections and deposited into the
      Principal Account...........................................$   361,637.79
                                                                   -------------

H.    The  amount  equal  to  the  aggregate  amount
      by  which  the Collateral  Interest  has  been
      reduced  below  the  Required Collateral  Interest
      for  reasons  other than the  payment of principal
      to the Collateral Interest Holder (but not in excess
      of the aggregate amount of such reductions which
      have not been previously  reimbursed)  which will
      be treated as a portion of Investor Principal
      Collections and deposited into the Principal Account........$         0.00
                                                                   -------------

I.    On each  Transfer  Date  from and after  the
      Reserve  Account Funding  Date,  but  prior to
      the date on  which  the  Reserve Account
      terminates as described in  subsection  4.16 (f),
      the amount  up to the  excess,  if any,  of the
      Required  Reserve Account Amount over the
      Available Reserve Account Amount which shall be
      deposited into the Reserve Account..........................$         0.00
                                                                   -------------

J.    The amount equal to the aggregate of any other
      amounts due to the Collateral Interest Holder
      out of collections of Excess Spread and Shared
      Excess Finance Charge Collections allocated to
      Series 1997-A pursuant to the Loan Agreement
      shall be distributed to the Collateral Interest
      Holder for application in accordance with the
      Loan Agreement..............................................$         0.00
                                                                   -------------

K.    The balance, if any, after giving effect to the
      payments made pursuant to subparagraphs (A)
      through (J) above will constitute a portion of
      Shared Excess Finance Charge Collections for
      such Distribution Date and will be available for
      allocation to other Series in Shared Excess Finance
      charge Collections Group One and, to the extent
      not required to be applied to any Series in Shared
      Excess Finance Charge Collections Group One, shall
      be distributed to the Holder of the Transferor
      Certificate.................................................$ 2,929,366.51
                                                                   -------------


IV.    REALLOCATED PRINCIPAL COLLECTIONS

            Pursuant to Section 4.12,  the Servicer  does hereby  instruct
    the  Trustee  to  withdraw  from the  Principal  Account  and apply
    Reallocated Principal  Collections  pursuant  to Section  4.12 with  respect
    to the  related Monthly Period in the following amounts:

A.    Reallocated Collateral Principal Receivables................$         0.00
                                                                   -------------

B.    Reallocated Class B Principal Receivables...................$         0.00
                                                                   -------------


V.    ACCRUED AND UNPAID AMOUNTS

            After giving effect to the withdrawals and transfers to be made in
    accordance with this notice, the following amounts will be accrued and
    unpaid with respect to all Monthly Periods preceding the current calendar
    month.

A.    Subsections 4.09 (a) (i) and (b) (i) :

      1.  The aggregate amount of the Class A
          Deficiency Amount.......................................$         0.00
                                                                   -------------

      2.  The aggregate amount of Class B Deficiency
          Amount..................................................$         0.00
                                                                   -------------

B.    Subsections 4.09 (a) (ii) and (b) (ii):

      1.  The aggregate amount of all accrued and
          unpaid Investor Monthly Servicing Fees..................$         0.00
                                                                   -------------

C.    Section 4.10:

      1.  The aggregate amount of all unreimbursed
          Investor Charge Offs....................................$         0.00
                                                                   -------------




IN WITNESS WHEREOF, the undersigned has duly executed this certificate this
12th day of MAY, 1998.
- ----        ---------


                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer


                                      By:  /s/ MARGARET A. SPRUDE
                                           ----------------------   
                                           Name:  Margaret A. Sprude
                                           Title: SVP & Chief Financial Officer



              MONTHLY SERIES 1997-A CERTIFICATEHOLDERS' STATEMENT
              ---------------------------------------------------

                                 Series 1997-A

                      BANK OF AMERICA NATIONAL ASSOCIATION
- --------------------------------------------------------------------------------

                          BA MASTER CREDIT CARD TRUST
- --------------------------------------------------------------------------------

         The  information  which is required to be prepared  with respect to the
Distribution  Date of MAY 15, 1998, and with respect to the performance of the
                      ------------
Trust during the related Monthly Period.

         Capitalized terms used in this Statement have their respective meanings
set forth in the Pooling and Servicing Agreement.

     A.  Information Regarding the Current Monthly Distribution (Stated on the
         ---------------------------------------------------------------------
         Basis of $1,000 Original Certificate Principal Amount)
         ------------------------------------------------------

         1.  The amount of the current monthly distribution
             in respect of Class A Monthly Principal...........$         0.00000
                                                                ----------------

         2.  The amount of the current monthly distribution
             in respect of Class B Monthly Principal...........$         0.00000
                                                                ----------------

         3.  The amount of the current monthly distribution
             in respect of Collateral Monthly Principal........$         0.00000
                                                                ----------------

         4.  The amount of the current monthly distribution
             in respect of Class A Monthly Interest............$         4.80521
                                                                ----------------

         5.  The amount of the current monthly distribution
             in respect of Class A Deficiency Amounts..........$         0.00000
                                                                ----------------

         6.  The amount of the current monthly distribution
             in respect of Class A Additional Interest.........$         0.00000
                                                                ----------------

         7.  The amount of the current monthly distribution
             in respect of Class B Monthly Interest............$         4.95521
                                                                ----------------

         8.  The amount of the current monthly distribution
             in respect of Class B Deficiency Amounts..........$         0.00000
                                                                ----------------

         9.  The amount of the current monthly distribution
             in respect of Class B Additional Interest.........$         0.00000
                                                                ----------------

        10.  The amount of the current monthly distribution
             in respect of Collateral Monthly Interest.........$         5.08854
                                                                ----------------

        11.  The amount of the current monthly distribution
             in respect of any accrued and unpaid Collateral
             Monthly Interest..................................$         0.00000
                                                                ----------------

     B.  Information Regarding the Performance of the Trust

         1.  Collection of Principal Receivables

             (a) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related Monthly Period which were
                 allocated in respect of the Class A
                 Certificates..................................$   83,250,001.24
                                                                ----------------

             (b) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related  Monthly Period which were
                 allocated in respect of the Class B
                 Certificates..................................$    5,293,352.68
                                                                ----------------

             (c) The aggregate amount of Collections of
                 Principal Receivables processed during
                 the related Monthly Period which were
                 allocated in respect of the Collateral
                 Interest......................................$    7,699,422.08
                                                                ----------------

         2.  Principal Receivables in the Trust

             (a) The aggregate amount of Principal
                 Receivables in the Trust as of the end
                 of the day on the last day of the
                 related Monthly Period........................$6,201,942,257.19
                                                                ----------------

             (b) The amount of Principal Receivables in
                 the Trust represented by the Investor
                 Interest of Series 1997-A as of the end
                 of the day on the last day of the related
                 Monthly Period................................$  750,000,000.00
                                                                ----------------

             (c) The amount of Principal Receivables in
                 the Trust represented by the Series
                 1997-A Adjusted Investor Interest as of
                 the end of day on the last day of the
                 related Monthly Period.......... .............$  750,000,000.00
                                                                ----------------

             (d) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$  648,750,000.00
                                                                ----------------

             (e) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Adjusted Investor Interest as of the end
                 of day on the last day of the related
                 Monthly Period................................$  648,750,000.00
                                                                ----------------

             (f) The amount of Principal Receivables in
                 the Trust represented by the Class B
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$   41,250,000.00
                                                                ----------------

             (g) The amount of Principal Receivables in
                 the Trust represented by the Collateral
                 Interest as of the end of the day on the
                 last day of the related Monthly Period........$   60,000,000.00
                                                                ----------------

             (h) The Floating Investor Percentage with
                 respect to the related Monthly Period.........         12.0221%
                                                                ----------------

             (i) The Class A Floating Allocation with
                 respect to the related Monthly Period.........           86.50%
                                                                ----------------

             (j) The Class B Floating Allocation with
                 respect to the related Monthly Period.........            5.50%
                                                                ----------------

             (k) The Collateral Floating Allocation with
                 respect to the related Monthly Period.........            8.00%
                                                                ----------------

             (l) The Fixed Investor Percentage with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

             (m) The Class A Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (n) The Class B Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (o) The Collateral Fixed Allocation with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

         3.  Delinquent Balances
             -------------------

             The aggregate amount of outstanding balances in the
             Accounts which were delinquent as of the end of the
             day on the last day of the related Monthly Period:

                                             Aggregate             Percentage of
                                              Account                  Total
                                              Balance               Receivables
                                             ---------             -------------

             (a)  31 - 60 days            $109,921,198.32             1.7434%
             (b)  61 - 90 days            $ 69,582,902.40             1.1036%
             (c)  91 - or more days       $123,864,202.97             1.9645%
             Total....................... $303,368,303.69             4.8116%

         4.  Investor Default Amount
             -----------------------

             (a) The Aggregate Investor Default Amount
                 for the related Monthly Period................$    4,520,472.38
                                                                ----------------

             (b) The Class A Investor Default Amount
                 for the related Monthly Period................$    3,910,208.61
                                                                ----------------

             (c) The Class B Investor Default Amount
                 for the related Monthly Period................$      248,625.98
                                                                ----------------

             (d) The Collateral Default Amount for
                 the related Monthly Period....................$      361,637.79
                                                                ----------------

         5.  Investor Charge Offs
             --------------------

             (a) The aggregate amount of Class A
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (b) The aggregate amount of Class A
                 Investor Charge Offs set forth in
                 5(a) above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (c) The aggregate amount of Class B
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (d) The aggregate amount of Class B
                 Investor Charge Offset forth in 5(c)
                 above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (e) The aggregate amount of Collateral
                 Charge Offs for the related Monthly
                 Period........................................$            0.00
                                                                ----------------

             (f) The aggregate amount of Collateral
                 Charge Offs set forth in 5(e)  above
                 per  $1,000 of original certificate
                 principal amount..............................$            0.00
                                                                ----------------

             (g) The aggregate amount of Class A
                 Investor Charge Offs reimbursed on
                 the Transfer Date immediately preceding
                 this Distribution Date .......................$            0.00
                                                                ----------------

             (h) The aggregate amount of Class A
                 Investor Charge  Offs  set  forth
                 in 5(g)  above  per $1,000 original
                 certificate principal amount
                 reimbursed on the Transfer Date
                 immediately preceding this Distribution
                 Date..........................................$            0.00
                                                                ----------------

             (i) The aggregate amount of Class B
                 Investor Charge Offs  reimbursed
                 on the Transfer Date immediately
                 preceding this Distribution Date .............$            0.00
                                                                ----------------

             (j) The aggregate amount of Class B
                 Investor Charge Offs set forth
                 in 5(i)  above  per $1,000 original
                 certificate principal amount reimbursed
                 on the Transfer Date  immediately
                 preceding this Distribution Date..............$            0.00
                                                                ----------------

             (k) The aggregate amount of Collateral
                 Charge Offs reimbursed on the Transfer
                 Date immediately preceding this
                 Distribution Date.............................$            0.00
                                                                ----------------

             (l) The aggregate amount of Collateral
                 Charge Offs set forth in 5(k) above
                 per $1,000 original certificate
                 principal amount reimbursed on the
                 Transfer Date immediately preceding
                 Distribution Date.............................$            0.00
                                                                ----------------

         6.  Investor Servicing Fee
             ----------------------

             (a) The amount of the Class A Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly
                 Period........................................$      540,625.00
                                                                ----------------

             (b) The amount of the Class B Servicing
                 Fee payable by the Trust to the 
                 Servicer for the related Monthly
                 Period........................................$       34,375.00
                                                                ----------------

             (c) The amount of the Collateral Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly Period.......$       50,000.00
                                                                ----------------

             (d) The amount of Servicer Interchange
                 payable by the Trust to the Servicer
                 for the related Monthly Period................$      625,000.00
                                                                ----------------

         7.  Reallocations
             -------------

             (a) The amount of Reallocated Collateral
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (b) The amount of Reallocated Class B
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (c) The Collateral Interest as of the
                 close of business on this Distribution
                 Date..........................................$   60,000,000.00
                                                                ----------------

             (d) The Class B Investor Interest as
                 of the close of business on this
                 Distribution Date.............................$   41,250,000.00
                                                                ----------------

         8.  Collection of Finance Charge Receivables
             ----------------------------------------

             (a) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period  which  were allocated in
                 respect of the Class A Certificates...........$   10,122,171.73
                                                                ----------------

             (b) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period which were allocated in respect
                 of the Class B Certificates...................$      643,606.30
                                                                ----------------

             (c) The aggregate  amount of Collections of
                 Finance Charge Receivables  processed
                 during the related Monthly Period which
                 were allocated in respect of the
                 Collateral Interest...........................$      936,154.61
                                                                ----------------

         9.  Principal Funding Account
             -------------------------

             (a) The principal amount on deposit in the
                 Principal Funding Account on the
                 related Transfer Date.........................$            0.00
                                                                ----------------

             (b) The Accumulation Shortfall with respect
                 to the related Monthly Period.................$            0.00
                                                                ----------------

             (c) The Principal Funding Investment
                 Proceeds deposited in the Finance
                 Charge Account on the related
                 Transfer Date.................................$            0.00
                                                                ----------------

             (d) The Principal Funding Investment
                 Shortfall.....................................$            0.00
                                                                ----------------

             (e) The amount of all or  the portion of
                 the Reserve Draw Amount deposited in
                 the Finance Charge Account on the
                 related Transfer Date from the Reserve
                 Account.......................................$            0.00
                                                                ----------------

        10.  Reserve Draw Amount...............................$            0.00
             -------------------                                ----------------

        11.  Available Funds
             ---------------

             (a) The amount of Class A Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$   10,122,171.73
                                                                ----------------

             (b) The amount of Class B Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$      643,606.30
                                                                ----------------

             (c) The amount of Collateral Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$     936,154.611
                                                                ----------------

        12.  Portfolio Yield
             ---------------

             (a) The Portfolio Yield (Net) for the
                 related Monthly Period........................         12.4903%
                                                                ----------------

             (b) The Portfolio Adjusted Yield for
                 the related Monthly Period....................          4.1869%
                                                                ----------------

     C.  Floating Rate Determinations
         ----------------------------

         1.  LIBOR for the Interest Period ending on
             this Distribution Date.............................        5.65625%
                                                                ----------------

         2.  Class A Certificate Rate...........................        5.76625%
                                                                ----------------

             Class B Certificate Rate...........................        5.94625%
                                                                ----------------


                                BANK OF AMERICA NATIONAL ASSOCIATION

                                Transferor and Servicer



                                By: \s\ MARGARET A. SPRUDE
                                    ------------------------------------
                                    Name:  Margaret A. Sprude
                                    Title: SVP & Chief Financial Officer



                   SCHEDULE TO MONTHLY SERVICER'S CERTIFICATE
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1997-A


      1.  The aggregate amount of the Investor Percentage
          of Collections of Principal Receivables................$ 96,242,776.00
                                                                  --------------

      2.  The aggregate amount of the Investor Percentage
          of Collections of Finance Charge Receivables
          (excluding Interchange)................................$ 11,186,362.88
                                                                  --------------

      3.  The aggregate amount of the Investor Percentage
          of Interchange.........................................$  1,140,569.76
                                                                  --------------

      4.  The aggregate amount of Servicer Interchange...........$    625,000.00
                                                                  --------------

      5.  The aggregate amount of funds on deposit in
          Finance Charge Account allocable to the Series
          1997-A Certificates................................... $ 11,701,932.64
                                                                  --------------

      6.  The aggregate amount of funds on deposit in
          the Principal Account allocable to the Series
          1997-A  Certificates...................................$ 96,242,776.00
                                                                  --------------

      7.  The aggregate amount of funds on deposit in
          the Principal Funding Account allocable to
          the Series 1997-A Certificates.........................$          0.00
                                                                  --------------

      8.  The aggregate amount to be withdrawn from the
          Finance Charge Account and paid in accordance
          with the Loan Agreement pursuant to Section 4.11.......$          0.00
                                                                  --------------

      9.  The excess, if any, of the Required Collateral
          Interest over the Collateral Interest..................$          0.00
                                                                  --------------

     10.  The Collateral Interest on the Transfer Date
          of the current calendar month, after giving
          effect to the deposits and withdrawals specified
          above, is equal to.....................................$ 60,000,000.00
                                                                  --------------

     11. The amount of Monthly Interest, Deficiency
         Amounts and Additional Interest payable to the
         (i)  Class A Certificateholders.........................$  3,117,378.91
                                                                  --------------

         (ii) Class B Certificateholders.........................$    204,402.34
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    305,312.50
                                                                  --------------

     12. The amount of principal payable to the
         (i)  Class A Certificateholders.........................$          0.00
                                                                  --------------

         (ii) Class B Certificateholders.........................$          0.00
                                                                  --------------

         (iii)Collateral Interest Holder.........................$          0.00
                                                                  --------------

     13. The sum of all amounts payable to the
         (i)  Class A Certificateholders.........................$  3,117,378.91
                                                                  --------------

         (ii) Class B Certificateholders ........................$    204,402.34
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    305,312.50
                                                                  --------------

     14. To the knowledge of the undersigned, no Series
         1997-A  Pay Out  Event or  Trust  Pay Out  Event
         has occurred except as described below:

                                    None



                   IN WITNESS WHEREOF, the undersigned has duly executed
          and delivered this Certificate this 12th day of MAY, 1998.
                                              ----        ---------

                                 BANK OF AMERICA NATIONAL ASSOCIATION

                                 Transferor and Servicer


                                 By:  /s/ MARGARET A. SPRUDE
                                      --------------------------------------
                                      Name: Margaret A. Sprude
                                      Title:   SVP & Chief Financial Officer



                         MONTHLY SERVICER'S CERTIFICATE
                         ------------------------------
                      (This represents Series 1997-A only)

                      Monthly Period Ending APRIL 30, 1998
                                            --------------
                      Bank of America National Association
                      ------------------------------------

                           BA MASTER CREDIT CARD TRUST
                           ---------------------------


                  1. Capitalized  terms  used in this  Certificate  have  their
respective meanings set forth in the Pooling and Servicing Agreement;  provided,
                                                                       --------
that the "preceding  Monthly  Period" shall mean the Monthly Period  immediately
preceding  the  calendar  month in which this  Certificate  is  delivered.  This
Certificate  is  delivered  pursuant to  subsection  3.04 (b) of the Pooling and
Servicing  Agreement.  References herein to certain sections and subsections are
references  to the  respective  sections  and  subsections  of the  Pooling  and
Servicing Agreement.

                  2. Bank of America National  Association is Servicer under the
Pooling and Servicing Agreement.

                  3. The undersigned is a Servicing Officer.

                  4. The date of this Certificate is a Determination  Date under
the Pooling and Servicing Agreement.

                  5. The aggregate amount of Collections
processed during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange)...............$889,759,970.54
                                                                  --------------

                  6. The Aggregate Investor Percentage of
Receivables processed by the Servicer during the preceding
Monthly Period was equal to......................................$108,000,002.02
                                                                  --------------

                  7. The Aggregate Investor Percentage of
Collections of Finance Charge Receivables processed by the
Servicer during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange)...............$ 10,983,081.69
                                                                  --------------

                  8. The aggregate amount of Receivables
processed by the Servicer as of the end of the last day
of the preceding Monthly Period..................................$898,345,563.74
                                                                  --------------

                  9. Of the  balance on deposit in the
Finance  Charge  Account, the amount  attributable  to
the Aggregate  Investor  Percentage of  Collections
processed by the Servicer during the preceding Monthly
Period ..........................................................$ 12,326,932.64
                                                                  --------------

                  10. Of the balance on deposit in the
Principal  Account,  the amount   attributable  to  the
Aggregate  Investor  Percentage  of  Collections
processed by the Servicer during the preceding Monthly
Period...........................................................$ 96,242,776.00
                                                                  --------------

                  11. The aggregate amount, if any, of
withdrawals, drawings or payments under any Credit
Enhancement, if any, required to be made with respect to
any Series outstanding for the preceding Monthly Period..........$          0.00
                                                                  --------------

                  12. The Aggregate Investor Percentage
of  Collections  of Principal  Receivables  processed
by the  Servicer  during the related  Monthly Period is
equal to.........................................................$ 96,242,776.00
                                                                  --------------

                  13. The amount equal to the Aggregate
Investor Percentage of Annual Membership Fees deposited
to the Finance Charge Account or any Series Account on
or before the Transfer Date during the current month is
equal to.........................................................$    203,281.19
                                                                  --------------

                  14. The aggregate amount of Interchange
to be deposited in the Finance Charge Account on the
Transfer Date of the current month is equal to...................$  1,140,569.76
                                                                  --------------

                  15. The aggregate amount of all sums
payable to the Investor Certificateholder of each Series
on the succeeding Distribution Date with respect to
Certificate Principal............................................$          0.00
                                                                  --------------

                  16. The aggregate amount of all sums
payable to the Investor Certificateholder of each
Series on the succeeding Distribution Date with respect
to Certificate Interest..........................................$  3,627,093.75
                                                                  --------------

                  17. The aggregate amount of Default
Amounts processed by the Servicer as of the end of the
last day of the preceding Monthly Period.........................$ 37,601,354.03
                                                                  --------------

                  18. To the knowledge of the undersigned, there are no Liens on
any Receivables in the Trust except as described below:

                                      None



                  IN WITNESS  WHEREOF,  the  undersigned  has duly  executed and
delivered this certificate this 12th day of MAY, 1998.
                                ----        ---------

                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer

                                     By:  /s/ MARGARET A. SPRUDE
                                          -----------------------------
                                          Name:  Margaret A. Sprude
                                          Title: SVP & Chief Financial Officer



                  MONTHLY PAYMENT INSTRUCTIONS AND NOTIFICATION
                                 TO THE TRUSTEE
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1998-A
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------


                  Capitalized  terms used in this notice  have their  respective
meanings set forth in the Pooling and Servicing Agreement.  References herein to
certain  sections and subsections are references to the respective  sections and
subsections of the Pooling and Servicing Agreement as supplemented by the Series
1998-A Supplement. This notice is delivered pursuant to Section 4.09.
     
   A. Bank of America is the Servicer under the Pooling and Servicing Agreement.

   B. The undersigned is a Servicing Officer.

   C. The date of this notice is on or before the related  Transfer  Date under
      the Pooling and Servicing Agreement.

I.    INSTRUCTION TO MAKE A WITHDRAWAL

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee (i) to make  withdrawals  from the Finance Charge  Account,  the
    Principal  Account,  and the  Principal  Funding  Account on MAY 14, 1998,
                                                                 ------------
    which date is a Transfer Date under the Pooling and Servicing Agreement,  in
    aggregate  amounts set forth below in respect of the  following  amounts and
    (ii) to apply the proceeds of such withdrawals in accordance with subsection
    3 (a) of the Series  1998-A  Supplement  and Section 4.09 of the Pooling and
    Servicing Agreement:


A.    Pursuant to subsection 3 (a) of the Series 1998-A Supplement:

      1.    Servicer Interchange..................................$   375,000.00
                                                                   -------------

B.    Pursuant to subsection 4.09 (a) (i):

      1.    Class A Monthly Interest at the Class A
            Certificate Rate on the Class A Investor
            Interest..............................................$ 5,206,894.54
                                                                   -------------

      2.    Class A Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class A Additional Interest...........................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (a) (ii):

      1.    Class A Servicing Fee.................................$   324,375.00
                                                                   -------------

      2.    Accrued and unpaid Class A Servicing Fee..............$         0.00
                                                                   -------------

D.    Pursuant to subsection 4.09 (a) (iii):

      1.    Class A Investor Default Amount.......................$ 4,209,306.38
                                                                   -------------

E.    Pursuant to subsection 4.09 (a) (iv):

      1.    Portion of Excess Spread from Class A
            Available Funds to be allocated and,
            distributed as provided in Section 4.11...............$ 2,547,631.69
                                                                   -------------

F.    Pursuant to subsection 4.09 (b) (i):

      1.    Class B Monthly Interest at the Class B
            Certificate Rate on the Class B Investor
            Interest..............................................$   340,240.88
                                                                   -------------

      2.    Class B Deficiency Amount.............................$         0.00
                                                                   -------------

      3.    Class B Additional Interest...........................$         0.00
                                                                   -------------

G.    Pursuant to subsection 4.09 (b) (ii):

      1.    Class B Servicing Fee.................................$    20,625.00
                                                                   -------------

      2.    Accrued and unpaid Class B Servicing Fee..............$         0.00
                                                                   -------------

H.    Pursuant to subsection 4.09 (b) (iii):

      1.    Portion of Excess Spread from Class B
            Available Funds to be allocated and
            distributed as provided in Section 4.11...............$   420,465.25
                                                                   -------------

I.    Pursuant to subsection 4.09 (c) (i):

      1.    Collateral Interest Servicing Fee, if
            applicable............................................$          N/A
                                                                   -------------

      2.    Accrued and unpaid Collateral Interest
            Servicing Fee, if applicable..........................$          N/A
                                                                   -------------

J.    Pursuant to subsection 4.09 (c) (ii):

      1.    Portion of Excess Spread from Collateral 
            Available  Funds to be allocated and
            distributed as provided  in  Section 4.11.............$ 1,136,481.62
                                                                   -------------

            Total.................................................$14,581,020.36
                                                                   =============

K.    Pursuant to subsection 4.09 (d) (ii):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

L.    Pursuant to subsection 4.09 (d) (iii):

      1.    Amount to be  paid to the  Holder of  the
            Transferor Certificate...............................$117,934,740.06
                                                                  --------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

M.    Pursuant to subsection 4.09 (e) (i):

      1.    Class A Monthly Principal.............................$         0.00
                                                                   -------------

N.    Pursuant to subsection 4.09 (e) (ii):

      1.    Class B Monthly Principal.............................$         0.00
                                                                   -------------

O.    Pursuant to subsection 4.09 (e) (iii)

      1.    Collateral Monthly Principal to be applied
            in accordance with the Loan Agreement.................$         0.00
                                                                   -------------

P.    Pursuant to subsection 4.09 (e) (iv):

      1.    Amount to be treated as Shared Excess
            Principal Collections.................................$         0.00
                                                                   -------------

Q.    Pursuant to subsection 4.09 (e) (v):

      1.    Amount to be paid to the Holder of the
            Transferor Certificate................................$         0.00
                                                                   -------------

      2.    Unallocated Principal Collections.....................$         0.00
                                                                   -------------

R.    Pursuant to subsection 4.09 (f):

      1.    Amount to be withdrawn from the Principal
            Funding Account and deposited into the
            Distribution Account..................................$         0.00
                                                                   -------------

S.    Pursuant to Section 4.13:

      1.    Amount of Shared Excess Finance Charge
            Collections to be withdrawn from the
            Finance Charge account to be allocated to
            Series 1998-A and distributed as provided
            in Section 4.11.......................................$         0.00
                                                                   -------------


II.   INSTRUCTION TO MAKE CERTAIN PAYMENTS

           Pursuant to Section 4.09,  the Servicer  does hereby  instruct
    the Trustee to pay in accordance with Section 5.01 from the Distribution
    Account on MAY 15,  1998,  which date is a  Distribution  Date under the
               -------------
    Pooling  and Servicing  Agreement,  amounts so deposited in the Distribution
    Account pursuant to Section 4.09 as set forth below:

A.    Pursuant to subsection 4.09 (g):

      1.    Amount to be distributed to Class A 
            Certificateholders....................................$ 5,206,894.54
                                                                   -------------

      2.    Amount to be distributed to Class B 
            Certificateholders....................................$   340,240.88
                                                                   -------------

B.    Pursuant to subsection 4.09 (h) (i):

      1.    Amount to be distributed to Class A
            Certificateholders....................................$         0.00
                                                                   -------------

C.    Pursuant to subsection 4.09 (h) (ii):

      1.      Amount to be distributed to the  Class B
              Certificateholders..................................$         0.00
                                                                   -------------


III.     APPLICATION OF EXCESS SPREAD

           Pursuant to Section 4.11,  the Servicer  does hereby  instruct the
    Trustee to apply the Excess  Spread  with  respect to the  related  Monthly
    Period and to make the following distributions in the following priority:

A.    The amount equal to the Class A Required Amount,
      if any, which will be used to fund the Class A
      Required Amount and be applied in accordance
      with, and in the priority set forth in,
      subsection 4.09 (a).........................................$         0.00
                                                                   -------------

B.    The amount equal to the  aggregate  amount of
      Class A Investor Charge Offs which have not been
      previously  reimbursed  (after giving  effect  to
      the  allocation  on such  Transfer  Date of certain
      other amounts  applied for that purpose) which
      will be treated as a portion of  Investor
      Principal  Collections  and deposited into the
      Principal Account on such Transfer Date.....................$         0.00
                                                                   -------------

C.    The amount equal to the Class B Required
      Amount, if any, which will be  used to fund  the
      Class  B  Required  Amount  and be applied  first
      in  accordance  with,  and in the  priority set
      forth in, subsection  4.09(b) and then any
      amount available to pay the Class B Investor
      Default Amount shall be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$   267,643.76
                                                                   -------------


D.    The amount equal to the aggregate  amount by
      which the Class B Investor Interest has been
      reduced  below the initial Class B Investor
      Interest for reasons other than the payment of
      principal to the Class B Certificateholders
      (but not in excess of the aggregate amount of
      such reductions which have not been previously
      reimbursed)  which will be treated as a portion
      of Investor Principal Collections and
      deposited into the Principal Account........................$         0.00
                                                                   -------------


E.    The amount equal to the Collateral  Monthly
      Interest plus the amount of any past due
               ----
      Collateral  Monthly Interest which will be paid
      to the Collateral  Interest  Holder for
      application in accordance with the Loan Agreement...........$   514,062.50
                                                                   -------------


F.    The amount equal to the aggregate amount of
      accrued but unpaid Collateral  Interest
      Servicing Fees which will be paid to the
      Servicer if the Transferor or an Acceptable
      Successor Servicer is the Servicer..........................$    30,000.00
                                                                   -------------

G.    The amount equal to the Collateral Default
      Amount, if any, for the prior Monthly Period
      which will be treated as a portion of Investor
      Principal Collections and deposited into the
      Principal Account...........................................$   389,300.01
                                                                   -------------

H.    The  amount  equal  to  the  aggregate  amount
      by  which  the Collateral  Interest  has  been
      reduced  below  the  Required Collateral  Interest
      for  reasons  other than the  payment of principal
      to the Collateral Interest Holder (but not in excess
      of the aggregate amount of such reductions which
      have not been previously  reimbursed)  which will
      be treated as a portion of Investor Principal
      Collections and deposited into the Principal Account........$         0.00
                                                                   -------------

I.    On each  Transfer  Date  from and after  the
      Reserve  Account Funding  Date,  but  prior to
      the date on  which  the  Reserve Account
      terminates as described in  subsection  4.16 (f),
      the amount  up to the  excess,  if any,  of the
      Required  Reserve Account Amount over the
      Available Reserve Account Amount which shall be
      deposited into the Reserve Account..........................$         0.00
                                                                   -------------

J.    The amount equal to the aggregate of any other
      amounts due to the Collateral Interest Holder
      out of collections of Excess Spread and Shared
      Excess Finance Charge Collections allocated to
      Series 1998-A pursuant to the Loan Agreement
      shall be distributed to the Collateral Interest
      Holder for application in accordance with the
      Loan Agreement..............................................$         0.00
                                                                   -------------

K.    The balance, if any, after giving effect to the
      payments made pursuant to subparagraphs (A)
      through (J) above will constitute a portion of
      Shared Excess Finance Charge Collections for
      such Distribution Date and will be available for
      allocation to other Series in Shared Excess Finance
      charge Collections Group One and, to the extent
      not required to be applied to any Series in Shared
      Excess Finance Charge Collections Group One, shall
      be distributed to the Holder of the Transferor
      Certificate.................................................$ 2,903,572.29
                                                                   -------------


IV.    REALLOCATED PRINCIPAL COLLECTIONS

            Pursuant to Section 4.12,  the Servicer  does hereby  instruct
    the  Trustee  to  withdraw  from the  Principal  Account  and apply
    Reallocated Principal  Collections  pursuant  to Section  4.12 with  respect
    to the  related Monthly Period in the following amounts:

A.    Reallocated Collateral Principal Receivables................$         0.00
                                                                   -------------

B.    Reallocated Class B Principal Receivables...................$         0.00
                                                                   -------------


V.    ACCRUED AND UNPAID AMOUNTS

            After giving effect to the withdrawals and transfers to be made in
    accordance with this notice, the following amounts will be accrued and
    unpaid with respect to all Monthly Periods preceding the current calendar
    month.

A.    Subsections 4.09 (a) (i) and (b) (i) :

      1.  The aggregate amount of the Class A
          Deficiency Amount.......................................$         0.00
                                                                   -------------

      2.  The aggregate amount of Class B Deficiency
          Amount..................................................$         0.00
                                                                   -------------

B.    Subsections 4.09 (a) (ii) and (b) (ii):

      1.  The aggregate amount of all accrued and
          unpaid Investor Monthly Servicing Fees..................$         0.00
                                                                   -------------

C.    Section 4.10:

      1.  The aggregate amount of all unreimbursed
          Investor Charge Offs....................................$         0.00
                                                                   -------------




IN WITNESS WHEREOF, the undersigned has duly executed this certificate this
12th day of MAY, 1998.
- ----        ---------


                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer


                                      By:  /s/ MARGARET A. SPRUDE
                                           ----------------------   
                                           Name:  Margaret A. Sprude
                                           Title: SVP & Chief Financial Officer



              MONTHLY SERIES 1998-A CERTIFICATEHOLDERS' STATEMENT
              ---------------------------------------------------

                                 Series 1998-A

                      BANK OF AMERICA NATIONAL ASSOCIATION
- --------------------------------------------------------------------------------

                          BA MASTER CREDIT CARD TRUST
- --------------------------------------------------------------------------------

         The  information  which is required to be prepared  with respect to the
Distribution  Date of MAY 15, 1998, and with respect to the performance of the
                      ------------
Trust during the related Monthly Period.

         Capitalized terms used in this Statement have their respective meanings
set forth in the Pooling and Servicing Agreement.

     A.  Information Regarding the Current Monthly Distribution (Stated on the
         ---------------------------------------------------------------------
         Basis of $1,000 Original Certificate Principal Amount)
         ------------------------------------------------------

         1.  The amount of the current monthly distribution
             in respect of Class A Monthly Principal...........$         0.00000
                                                                ----------------

         2.  The amount of the current monthly distribution
             in respect of Class B Monthly Principal...........$         0.00000
                                                                ----------------

         3.  The amount of the current monthly distribution
             in respect of Collateral Monthly Principal........$         0.00000
                                                                ----------------

         4.  The amount of the current monthly distribution
             in respect of Class A Monthly Interest............$         8.02604
                                                                ----------------

         5.  The amount of the current monthly distribution
             in respect of Class A Deficiency Amounts..........$         0.00000
                                                                ----------------

         6.  The amount of the current monthly distribution
             in respect of Class A Additional Interest.........$         0.00000
                                                                ----------------

         7.  The amount of the current monthly distribution
             in respect of Class B Monthly Interest............$         8.24826
                                                                ----------------

         8.  The amount of the current monthly distribution
             in respect of Class B Deficiency Amounts..........$         0.00000
                                                                ----------------

         9.  The amount of the current monthly distribution
             in respect of Class B Additional Interest.........$         0.00000
                                                                ----------------

        10.  The amount of the current monthly distribution
             in respect of Collateral Monthly Interest.........$         8.56771
                                                                ----------------

        11.  The amount of the current monthly distribution
             in respect of any accrued and unpaid Collateral
             Monthly Interest..................................$         0.00000
                                                                ----------------

     B.  Information Regarding the Performance of the Trust
         --------------------------------------------------

         1.  Collection of Principal Receivables
             -----------------------------------

             (a) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related Monthly Period which were
                 allocated in respect of the Class A
                 Certificates..................................$   97,804,243.77
                                                                ----------------

             (b) The aggregate amount of Collections of
                 Principal  Receivables  processed during
                 the related  Monthly Period which were
                 allocated in respect of the Class B
                 Certificates..................................$    6,218,766.94
                                                                ----------------

             (c) The aggregate amount of Collections of
                 Principal Receivables processed during
                 the related Monthly Period which were
                 allocated in respect of the Collateral
                 Interest......................................$    9,045,479.20
                                                                ----------------

         2.  Principal Receivables in the Trust
             ----------------------------------

             (a) The aggregate amount of Principal
                 Receivables in the Trust as of the end
                 of the day on the last day of the
                 related Monthly Period........................$6,201,942,257.19
                                                                ----------------

             (b) The amount of Principal Receivables in
                 the Trust represented by the Investor
                 Interest of Series 1998-A as of the end
                 of the day on the last day of the related
                 Monthly Period................................$  750,000,000.00
                                                                ----------------

             (c) The amount of Principal Receivables in
                 the Trust represented by the Series
                 1998-A Adjusted Investor Interest as of
                 the end of day on the last day of the
                 related Monthly Period.......... .............$  750,000,000.00
                                                                ----------------

             (d) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$  648,750,000.00
                                                                ----------------

             (e) The amount of Principal Receivables in
                 the Trust represented by the Class A
                 Adjusted Investor Interest as of the end
                 of day on the last day of the related
                 Monthly Period................................$  648,750,000.00
                                                                ----------------

             (f) The amount of Principal Receivables in
                 the Trust represented by the Class B
                 Investor Interest as of the end of the
                 day on the last day of the related
                 Monthly Period................................$   41,250,000.00
                                                                ----------------

             (g) The amount of Principal Receivables in
                 the Trust represented by the Collateral
                 Interest as of the end of the day on the
                 last day of the related Monthly Period........$   60,000,000.00
                                                                ----------------

             (h) The Floating Investor Percentage with
                 respect to the related Monthly Period.........         12.0302%
                                                                ----------------

                 The Floating Investor Percentage with
                 Respect to the second month of the related
                 Monthly Period...............................          12.0221%
                                                                ----------------

             (i) The Class A Floating Allocation with
                 respect to the related Monthly Period.........           86.50%
                                                                ----------------

             (j) The Class B Floating Allocation with
                 respect to the related Monthly Period.........            5.50%
                                                                ----------------

             (k) The Collateral Floating Allocation with
                 respect to the related Monthly Period.........            8.00%
                                                                ----------------

             (l) The Fixed Investor Percentage with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

             (m) The Class A Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (n) The Class B Fixed Allocation with respect
                 to the related Monthly Period.................              N/A
                                                                ----------------

             (o) The Collateral Fixed Allocation with
                 respect to the related Monthly Period.........              N/A
                                                                ----------------

         3.  Delinquent Balances
             -------------------

             The aggregate amount of outstanding balances in the
             Accounts which were delinquent as of the end of the
             day on the last day of the related Monthly Period:

                                             Aggregate             Percentage of
                                              Account                  Total
                                              Balance               Receivables
                                             ---------             -------------

             (a)  31 - 60 days            $109,921,198.32             1.7434%
             (b)  61 - 90 days            $ 69,582,902.40             1.1036%
             (c)  91 - or more days       $123,864,202.97             1.9645%
             Total....................... $303,368,303.69             4.8116%

         4.  Investor Default Amount
             -----------------------

             (a) The Aggregate Investor Default Amount
                 for the related Monthly Period................$    4,866,250.15
                                                                ----------------

             (b) The Class A Investor Default Amount
                 for the related Monthly Period................$    4,209,306.38
                                                                ----------------

             (c) The Class B Investor Default Amount
                 for the related Monthly Period................$      267,643.76
                                                                ----------------

             (d) The Collateral Default Amount for
                 the related Monthly Period....................$      389,300.01
                                                                ----------------

         5.  Investor Charge Offs
             --------------------

             (a) The aggregate amount of Class A
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (b) The aggregate amount of Class A
                 Investor Charge Offs set forth in
                 5(a) above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (c) The aggregate amount of Class B
                 Investor Charge Offs for the related
                 Monthly Period................................$            0.00
                                                                ----------------

             (d) The aggregate amount of Class B
                 Investor Charge Offset forth in 5(c)
                 above per $1,000 of original
                 certificate principal amount..................$            0.00
                                                                ----------------

             (e) The aggregate amount of Collateral
                 Charge Offs for the related Monthly
                 Period........................................$            0.00
                                                                ----------------

             (f) The aggregate amount of Collateral
                 Charge Offs set forth in 5(e)  above
                 per  $1,000 of original certificate
                 principal amount..............................$            0.00
                                                                ----------------

             (g) The aggregate amount of Class A
                 Investor Charge Offs reimbursed on
                 the Transfer Date immediately preceding
                 this Distribution Date .......................$            0.00
                                                                ----------------

             (h) The aggregate amount of Class A
                 Investor Charge  Offs  set  forth
                 in 5(g)  above  per $1,000 original
                 certificate principal amount
                 reimbursed on the Transfer Date
                 immediately preceding this Distribution
                 Date..........................................$            0.00
                                                                ----------------

             (i) The aggregate amount of Class B
                 Investor Charge Offs  reimbursed
                 on the Transfer Date immediately
                 preceding this Distribution Date .............$            0.00
                                                                ----------------

             (j) The aggregate amount of Class B
                 Investor Charge Offs set forth
                 in 5(i)  above  per $1,000 original
                 certificate principal amount reimbursed
                 on the Transfer Date  immediately
                 preceding this Distribution Date..............$            0.00
                                                                ----------------

             (k) The aggregate amount of Collateral
                 Charge Offs reimbursed on the Transfer
                 Date immediately preceding this
                 Distribution Date.............................$            0.00
                                                                ----------------

             (l) The aggregate amount of Collateral
                 Charge Offs set forth in 5(k) above
                 per $1,000 original certificate
                 principal amount reimbursed on the
                 Transfer Date immediately preceding
                 Distribution Date.............................$            0.00
                                                                ----------------

         6.  Investor Servicing Fee
             ----------------------

             (a) The amount of the Class A Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly
                 Period........................................$      324,375.00
                                                                ----------------

             (b) The amount of the Class B Servicing
                 Fee payable by the Trust to the 
                 Servicer for the related Monthly
                 Period........................................$       20,625.00
                                                                ----------------

             (c) The amount of the Collateral Servicing
                 Fee payable by the Trust to the
                 Servicer for the related Monthly Period.......$       30,000.00
                                                                ----------------

             (d) The amount of Servicer Interchange
                 payable by the Trust to the Servicer
                 for the related Monthly Period................$      375,000.00
                                                                ----------------

         7.  Reallocations
             -------------

             (a) The amount of Reallocated Collateral
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (b) The amount of Reallocated Class B
                 Principal Collections with respect
                 to this Distribution Date.....................$            0.00
                                                                ----------------

             (c) The Collateral Interest as of the
                 close of business on this Distribution
                 Date..........................................$   60,000,000.00
                                                                ----------------

             (d) The Class B Investor Interest as
                 of the close of business on this
                 Distribution Date.............................$   41,250,000.00
                                                                ----------------

         8.  Collection of Finance Charge Receivables
             ----------------------------------------

             (a) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period  which  were allocated in
                 respect of the Class A Certificates...........$   12,288,207.61
                                                                ----------------

             (b) The aggregate amount of Collections
                 of Finance Charge Receivables
                 processed during the related Monthly
                 Period which were allocated in respect
                 of the Class B Certificates...................$      781,331.13
                                                                ----------------

             (c) The aggregate  amount of Collections of
                 Finance Charge Receivables  processed
                 during the related Monthly Period which
                 were allocated in respect of the
                 Collateral Interest...........................$    1,136,481.62
                                                                ----------------

         9.  Principal Funding Account
             -------------------------

             (a) The principal amount on deposit in the
                 Principal Funding Account on the
                 related Transfer Date.........................$            0.00
                                                                ----------------

             (b) The Accumulation Shortfall with respect
                 to the related Monthly Period.................$            0.00
                                                                ----------------

             (c) The Principal Funding Investment
                 Proceeds deposited in the Finance
                 Charge Account on the related
                 Transfer Date.................................$            0.00
                                                                ----------------

             (d) The Principal Funding Investment
                 Shortfall.....................................$            0.00
                                                                ----------------

             (e) The amount of all or  the portion of
                 the Reserve Draw Amount deposited in
                 the Finance Charge Account on the
                 related Transfer Date from the Reserve
                 Account.......................................$            0.00
                                                                ----------------

        10.  Reserve Draw Amount...............................$            0.00
             -------------------                                ----------------

        11.  Available Funds
             ---------------

             (a) The amount of Class A Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$   12,288,207.61
                                                                ----------------

             (b) The amount of Class B Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$      781,331.13
                                                                ----------------

             (c) The amount of Collateral Available
                 Funds on deposit in the Finance
                 Charge Account on the related
                 Transfer Date.................................$   1,136,481.62
                                                                ----------------

        12.  Portfolio Yield
             ---------------

             (a) The Portfolio Yield (Net) for the
                 related Monthly Period........................         12.9531%
                                                                ----------------

             (b) The Portfolio Adjusted Yield for
                 the related Monthly Period....................          5.1343%
                                                                ----------------

     C.  Floating Rate Determinations
         ----------------------------

         1.  LIBOR for the Interest Period ending on
             this Distribution Date.............................        5.65625%
                                                                ----------------

             Class A Certificate Rate...........................        5.76625%
                                                                ----------------
             Class B Certificate Rate...........................        5.92625%
                                                                ----------------

         2.  LIBOR for the Interest Period ending on
             April 14, 1998.....................................        5.68750%
                                                                ----------------

             Class A Certificate Rate...........................        5.79750%
                                                                ----------------
             Class B Certificate Rate...........................        5.95750%
                                                                ----------------

     NOTE:  The initial Interest Period comprises the periods of March 26, 1998
            (Closing Date) through April 14, 1998 and April 15, 1998 through
            May 14, 1998.



                                BANK OF AMERICA NATIONAL ASSOCIATION

                                Transferor and Servicer



                                By: \s\ MARGARET A. SPRUDE
                                    ------------------------------------
                                    Name:  Margaret A. Sprude
                                    Title: SVP & Chief Financial Officer



                   SCHEDULE TO MONTHLY SERVICER'S CERTIFICATE
                      MONTHLY PERIOD ENDING APRIL 30, 1998
                                            --------------
                      BANK OF AMERICA NATIONAL ASSOCIATION
                    BA MASTER CREDIT CARD TRUST SERIES 1998-A


      1.  The aggregate amount of the Investor Percentage
          of Collections of Principal Receivables................$113,068,489.91
                                                                  --------------

      2.  The aggregate amount of the Investor Percentage
          of Collections of Finance Charge Receivables
          (excluding Interchange)................................$ 13,230,811.32
                                                                  --------------

      3.  The aggregate amount of the Investor Percentage
          of Interchange.........................................$  1,350,209.04
                                                                  --------------

      4.  The aggregate amount of Servicer Interchange...........$    375,000.00
                                                                  --------------

      5.  The aggregate amount of funds on deposit in
          Finance Charge Account allocable to the Series
          1998-A Certificates................................... $ 14,206,020.36
                                                                  --------------

      6.  The aggregate amount of funds on deposit in
          the Principal Account allocable to the Series
          1998-A  Certificates...................................$113,068,489.91
                                                                  --------------

      7.  The aggregate amount of funds on deposit in
          the Principal Funding Account allocable to
          the Series 1998-A Certificates.........................$          0.00
                                                                  --------------

      8.  The aggregate amount to be withdrawn from the
          Finance Charge Account and paid in accordance
          with the Loan Agreement pursuant to Section 4.11.......$          0.00
                                                                  --------------

      9.  The excess, if any, of the Required Collateral
          Interest over the Collateral Interest..................$          0.00
                                                                  --------------

     10.  The Collateral Interest on the Transfer Date
          of the current calendar month, after giving
          effect to the deposits and withdrawals specified
          above, is equal to.....................................$ 60,000,000.00
                                                                  --------------

     11. The amount of Monthly Interest, Deficiency
         Amounts and Additional Interest payable to the

         (i)  Class A Certificateholders.........................$  5,206,894.54
                                                                  --------------

         (ii) Class B Certificateholders.........................$    340,240.88
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    514,062.50
                                                                  --------------

     12. The amount of principal payable to the

         (i)  Class A Certificateholders.........................$          0.00
                                                                  --------------

         (ii) Class B Certificateholders.........................$          0.00
                                                                  --------------

         (iii)Collateral Interest Holder.........................$          0.00
                                                                  --------------

     13. The sum of all amounts payable to the

         (i)  Class A Certificateholders.........................$  5,206,894.54
                                                                  --------------

         (ii) Class B Certificateholders ........................$    340,240.88
                                                                  --------------

         (iii)Collateral Interest Holder.........................$    514,062.50
                                                                  --------------

     14. To the knowledge of the undersigned, no Series
         1998-A  Pay Out  Event or  Trust  Pay Out  Event
         has occurred except as described below:

                                    None



                   IN WITNESS WHEREOF, the undersigned has duly executed
          and delivered this Certificate this 12th day of MAY, 1998.
                                              ----        ---------

                                 BANK OF AMERICA NATIONAL ASSOCIATION

                                 Transferor and Servicer


                                 By:  /s/ MARGARET A. SPRUDE
                                      --------------------------------------
                                      Name: Margaret A. Sprude
                                      Title:   SVP & Chief Financial Officer



                         MONTHLY SERVICER'S CERTIFICATE
                         ------------------------------
                      (This represents Series 1998-A only)

                      Monthly Period Ending APRIL 30, 1998
                                            --------------
                      Bank of America National Association
                      ------------------------------------

                           BA MASTER CREDIT CARD TRUST
                           ---------------------------


                  1. Capitalized  terms  used in this  Certificate  have  their
respective meanings set forth in the Pooling and Servicing Agreement;  provided,
                                                                       --------
that the "preceding  Monthly  Period" shall mean the Monthly Period  immediately
preceding  the  calendar  month in which this  Certificate  is  delivered.  This
Certificate  is  delivered  pursuant to  subsection  3.04 (b) of the Pooling and
Servicing  Agreement.  References herein to certain sections and subsections are
references  to the  respective  sections  and  subsections  of the  Pooling  and
Servicing Agreement.

                  2. Bank of America National  Association is Servicer under the
Pooling and Servicing Agreement.

                  3. The undersigned is a Servicing Officer.

                  4. The date of this Certificate is a Determination  Date under
the Pooling and Servicing Agreement.

                  5. The aggregate amount of Collections
processed during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange).............$1,044,773,299.97
                                                                ----------------

                  6. The Aggregate Investor Percentage of
Receivables processed by the Servicer during the preceding
Monthly Period was equal to......................................$127,028,610.97
                                                                  --------------

                  7. The Aggregate Investor Percentage of
Collections of Finance Charge Receivables processed by the
Servicer during the preceding Monthly Period was equal to
(excluding Annual Membership Fees and Interchange)...............$ 12,974,253.07
                                                                  --------------

                  8. The aggregate amount of Receivables
processed by the Servicer as of the end of the last day
of the preceding Monthly Period................................$1,056,519,234.60
                                                                ----------------

                  9. Of the  balance on deposit in the
Finance  Charge  Account, the amount  attributable  to
the Aggregate  Investor  Percentage of  Collections
processed by the Servicer during the preceding Monthly
Period ..........................................................$ 14,581,020.36
                                                                  --------------

                  10. Of the balance on deposit in the
Principal  Account,  the amount   attributable  to  the
Aggregate  Investor  Percentage  of  Collections
processed by the Servicer during the preceding Monthly
Period...........................................................$113,068,489.91
                                                                  --------------

                  11. The aggregate amount, if any, of
withdrawals, drawings or payments under any Credit
Enhancement, if any, required to be made with respect to
any Series outstanding for the preceding Monthly Period..........$          0.00
                                                                  --------------

                  12. The Aggregate Investor Percentage
of  Collections  of Principal  Receivables  processed
by the  Servicer  during the related  Monthly Period is
equal to.........................................................$113,068,489.91
                                                                  --------------

                  13. The amount equal to the Aggregate
Investor Percentage of Annual Membership Fees deposited
to the Finance Charge Account or any Series Account on
or before the Transfer Date during the current month is
equal to.........................................................$    256,558.25
                                                                  --------------

                  14. The aggregate amount of Interchange
to be deposited in the Finance Charge Account on the
Transfer Date of the current month is equal to...................$  1,350,209.04
                                                                  --------------

                  15. The aggregate amount of all sums
payable to the Investor Certificateholder of each Series
on the succeeding Distribution Date with respect to
Certificate Principal............................................$          0.00
                                                                  --------------

                  16. The aggregate amount of all sums
payable to the Investor Certificateholder of each
Series on the succeeding Distribution Date with respect
to Certificate Interest..........................................$  6,061,197.92
                                                                  --------------

                  17. The aggregate amount of Default
Amounts processed by the Servicer as of the end of the
last day of the preceding Monthly Period.........................$ 40,475,601.90
                                                                  --------------

                  18. To the knowledge of the undersigned, there are no Liens on
any Receivables in the Trust except as described below:

                                      None



                  IN WITNESS  WHEREOF,  the  undersigned  has duly  executed and
delivered this certificate this 12th day of MAY, 1998.
                                ----        ---------

                                     BANK OF AMERICA NATIONAL ASSOCIATION

                                     Transferor and Servicer

                                     By:  /s/ MARGARET A. SPRUDE
                                          -----------------------------
                                          Name:  Margaret A. Sprude
                                          Title: SVP & Chief Financial Officer



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