DISCOVER CARD MASTER TRUST I
8-K, 1998-06-02
ASSET-BACKED SECURITIES
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<PAGE>   1
                                                                 COMFORMED COPY

                                UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C.  20549


                                  FORM 8-K


                               CURRENT REPORT


                        Pursuant to Section 13 of the

                       Securities Exchange Act of 1934


       Date of Report (Date of earliest event reported):  May 15, 1998


                        Discover Card Master Trust I
             --------------------------------------------------
             (Exact name of registrant as specified in charter)

     Delaware                    0-23108                   51-0020270
     --------                    -------                   ----------
    (State of                  (Commission               (IRS Employer
  Organization)                File Number)            Identification No.)

c/o Greenwood Trust Company
12 Read's Way
New Castle, Delaware                                     19720
- ---------------------------                              -----
(Address of principal executive offices) 
     (Zip Code)


Registrant's Telephone Number, including area code:  (302) 323-7184
                                                     --------------

Former name or former address, if changed since last report:  Not Applicable



                                   Page 1
                     The Exhibit Index appears on Page 8


<PAGE>   2




Item 5. Other Events

1. Series 1993-1.  On May 15, 1998, Greenwood Trust Company as Master Servicer,
Servicer and Seller ("Greenwood") and U.S. Bank National Association, as
Trustee (the "Trustee"), entered into a First Amendment to the Series 1993-1
Supplement, dated as of October 27, 1993, pursuant to Section 13.01(a) of the
Pooling and Servicing Agreement, dated as of October 1, 1993, between Greenwood
and the Trustee (formerly First Bank National Association, successor trustee to
Bank of America Illinois, formerly Continental Bank, National Association), as
amended with respect to Discover Card Master Trust I (the "Pooling and
Servicing Agreement").

2. Series 1993-2.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1993-2 Supplement, dated as of December 1, 1993,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

3. Series 1993-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1993-3 Supplement, dated as of November 23, 1993,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

4. Series 1994-2.  On May 15, 1998, Greenwood and the Trustee entered into a
Second Amendment to the Series 1994-2 Supplement, dated as of October 14, 1994,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

5. Series 1994-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1994-3 Supplement, dated as of October 20, 1994,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

6. Series 1995-1.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1995-1 Supplement, dated as of April 19, 1995,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

7. Series 1995-2.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1995-2 Supplement, dated as of August 1, 1995,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

8. Series 1995-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1995-3 Supplement, dated as of September 28,
1995, pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.






                                     Page 2

<PAGE>   3




9.  Series 1996-1.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1996-1 Supplement, dated as of January 18, 1996,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

10. Series 1996-2.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1996-2 Supplement, dated as of January 29, 1996,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

11. Series 1996-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1996-3 Supplement, dated as of February 21, 1996,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

12. Series 1996-4.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1996-4 Supplement, dated as of April 20, 1996,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

13. Series 1996-5.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1996-3 Supplement, dated as of July 24, 1996,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

14. Series 1997-1.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1997-1 Supplement, dated as of August 26, 1997,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

15. Series 1997-2.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1997-2 Supplement, dated as of October 15, 1997,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

16. Series 1997-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1997-3 Supplement, dated as of October 23, 1997,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

17. Series 1997-4.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1997-4 Supplement, dated as of October 31, 1997,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

18. Series 1998-1.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1998-1 Supplement, dated as of January 14, 1998,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.





                                     Page 3


<PAGE>   4




19. Series 1998-2.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1998-2 Supplement, dated as of March 4, 1998,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.

20. Series 1998-3.  On May 15, 1998, Greenwood and the Trustee entered into a
First Amendment to the Series 1998-3 Supplement, dated as of March 25, 1998,
pursuant to Section 13.01(a) of the Pooling and Servicing Agreement.


Item 7.       Exhibits
              --------
<TABLE>
<CAPTION>

Exhibit No.   Description
- -----------   -----------
<S>           <C>
Exhibit 4.1   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-1, dated as of October 27,
              1993, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.2   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-2, dated as of December 1,
              1993, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.3   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-3, dated as of November
              23, 1993, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.4   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1994-2, dated as of October 14,
              1994, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.5   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1994-3, dated as of October 20,
              1994, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.6   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-1, dated as of April 19,
              1995, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.
</TABLE>



                                   Page 4



<PAGE>   5


<TABLE>
<S>           <C>
Exhibit 4.7   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-2, dated as of August 1,
              1995, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.8   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-3, dated as of September
              28, 1995, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.9   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-1, dated as of January 18,
              1996, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.10  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-2, dated as of January 29,
              1996, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.11  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-3, dated as of February
              21, 1996, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.12  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-4, dated as of April 30,
              1996, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.13  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-5, dated as of July 24,
              1996, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.14  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-1, dated as of August 26,
              1997, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.15  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-2, dated as of October 15,
              1997, between Greenwood Trust 
</TABLE>

                                   Page 5



<PAGE>   6


<TABLE>
<S>           <C>
              Company as Master Servicer, Servicer and Seller and U.S. Bank 
              National Association as Trustee.

Exhibit 4.16  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-3, dated as of October 23,
              1997, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.17  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-4, dated as of October 31,
              1997, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.18  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-1, dated as of January 14,
              1998, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.19  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-2, dated as of March 4,
              1998, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.

Exhibit 4.20  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-3, dated as of March 25,
              1998, between Greenwood Trust Company as Master Servicer,
              Servicer and Seller and U.S. Bank National Association as
              Trustee.
</TABLE>



                                   Page 6



<PAGE>   7



                                 SIGNATURES
                                 ----------

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

                            Discover Card Master Trust I
                              (Registrant)


                            By:  Greenwood Trust Company
                                 (Originator of the Trust)




Date: June 2, 1998          By:  /s/ John J. Coane
                                 ---------------------------------------
                                 John J. Coane
                                 Vice President, Director of Accounting,
                                 Treasurer and Assistant Secretary




                                   Page 7



<PAGE>   8




                              INDEX TO EXHIBITS
                              -----------------

<TABLE>
<CAPTION>
Exhibit       Description                                                  Page
- -------       -----------                                                  ----
<S>           <C>                                                           <C>
Exhibit 4.1   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-1, dated as of 
              October 27, 1993, between Greenwood Trust Company as 
              Master Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.2   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-2, dated as of 
              December 1, 1993, between Greenwood Trust Company as 
              Master Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.3   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1993-3, dated as of 
              November 23, 1993, between Greenwood Trust Company as 
              Master Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.4   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1994-2, dated as of 
              October 14, 1994, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.5   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1994-3, dated as of 
              October 20, 1994, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.6   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-1, dated as of 
              April 19, 1995, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.7   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-2, dated as of 
              August 1, 1995, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.8   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1995-3, dated as of 
              September 28, 1995, between Greenwood Trust Company as 
              Master Servicer, Servicer and Seller and U.S. Bank 
              National Association as Trustee.
</TABLE>


                                   Page 8

<PAGE>   9



<TABLE>
<S>           <C>                                                          
Exhibit 4.9   First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-1, dated as of 
              January 18, 1996, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.10  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-2, dated as of 
              January 29, 1996, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.11  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-3, dated as of 
              February 21, 1996, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.12  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-4, dated as of 
              April 30, 1996, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.13  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1996-5, dated as of 
              July 24, 1996, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.14  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-1, dated as of 
              August 26, 1997, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.15  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-2, dated as of 
              October 15, 1997, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.16  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-3, dated as of 
              October 23, 1997, between Greenwood Trust Company as 
              Master Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.17  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1997-4, dated as of 
              October 31, 
</TABLE>

                                   Page 9



<PAGE>   10



<TABLE>
<S>           <C>                                                          
              1997, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.
                          
Exhibit 4.18  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-1, dated as of 
              January 14, 1998, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.19  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-2, dated as of 
              March 4, 1998, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.

Exhibit 4.20  First Amendment, dated as of May 15, 1998, to the Series
              Supplement with respect to Series 1998-3, dated as of 
              March 25, 1998, between Greenwood Trust Company as Master 
              Servicer, Servicer and Seller and U.S. Bank National 
              Association as Trustee.
</TABLE>






                                   Page 10


<PAGE>   1


                                                                    Exhibit 4.1

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller


                                     and


                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders

                            ____________________


                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of October 27, 1993

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993

                            ____________________


                                $797,873,000


                        DISCOVER CARD MASTER TRUST I
                         SERIES 1993-1 CERTIFICATES


                                 Dated as of

                                May 15, 1998



<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1993-1 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1993-2
SUPPLEMENT (the "Agreement"), executed and delivered as of October 27, 1993
with respect to the Series 1993-1 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and
10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i) with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Class A Excess Servicing plus the amount of Class
      B Excess Servicing; and

            (c) the sum of (i) the amount of CCA Available Collections on the
      immediately preceding Distribution Date that were used to fund all or
      part of the Class A Required Amount, the Class B Required Amount, the
      Class A Cumulative Investor Charged-Off Amount or the Class B Cumulative
      Investor Charged-Off Amount




<PAGE>   3




      on such immediately preceding Distribution Date and (ii) the amount of
      any reduction in the CCA Investor Interest resulting from the
      reimbursement of the Class B Cumulative Investor Charged-Off Amount; and

            (d) the sum of any amounts originally allocated to another Series on
      the immediately preceding Distribution Date (regardless of whether any
      such amounts were originally allocated to a Subordinate Series or were
      made available through the Group Finance Charge Collections Reallocation
      Account) that were reallocated to the Series established hereby on such
      immediately preceding Distribution Date to fund all or part of the Class
      A Required Amount, the Class B Required Amount, the Class A Cumulative
      Investor Charged-Off Amount or the Class B Cumulative Investor
      Charged-Off Amount;

as such amount may be reduced pursuant to the provisions of Section 9 to take
into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount
of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such Distribution Date.  In addition, on the first Distribution Date
following an Effective Alternative Credit Support Election, the Available
Subordinated Amount shall be increased by the Additional Subordinated Amount.
In no event, however, shall the Available Subordinated Amount exceed (i)
through the last Distribution Date preceding an Effective Alternative Credit
Support Election, the Initial Subordinated Amount and (ii) thereafter, the
Initial Subordinated Amount plus the Additional Subordinated Amount.

        (b) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

            (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

            (2) A new subsection (a)(6) shall be added as follows:

                (6) On the first Special Payment Date of the Amortization
            Period, if any, after giving effect to the payments and withdrawals
            described above on such day, an amount equal to the lesser of

                    (x) the Series Invested Amount and

                    (y) the amount on deposit in the Series Principal
                        Funding Account

            shall be withdrawn from the Series Principal Funding Account and
            shall be paid to the Investor Certificateholders pursuant to
            Section 5.01 of the Pooling and Servicing Agreement.  Except as set
            forth in the following sentence, all such

                                      2



<PAGE>   4




            amounts shall be paid to the Class A Investor Certificateholders
            until the Class A Invested Amount is reduced to zero; and,
            thereafter, if there is a Subordinate Class with respect to Class
            A, such amounts shall be paid to the Class B Investor
            Certificateholders until the Class B Invested Amount is reduced to
            zero, unless the Series Termination Date occurs prior to such date.
            Notwithstanding the foregoing, if the Special Payment Date is the
            first Special Payment Date following the occurrence of an Economic
            Early Amortization Event, an amount equal to the amount deposited
            into the Series Principal Funding Account pursuant to Section 9 for
            the benefit of the Class B Investor Certificateholders shall be
            paid to the Class B Investor Certificateholders, and not to the
            Class A Investor Certificateholders.  In no event shall any amounts
            be paid with respect to any Class of Investor Certificates pursuant
            to this clause (6) in excess of the Class Invested Amount for such
            Class.  Any amounts remaining on deposit in the Series Principal
            Funding Account after the Class Invested Amount for each Class has
            been reduced to zero shall be paid to the Holder of the Seller
            Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      3




<PAGE>   5




     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------





                                      4




<PAGE>   1

                                                                    Exhibit 4.2

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller


                                     and


                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders

                            ____________________


                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of December 1, 1993

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993

                            ____________________


                                $833,334,000


                        DISCOVER CARD MASTER TRUST I
                         SERIES 1993-2 CERTIFICATES


                                 Dated as of

                                May 15, 1998

                                      

<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1993-2 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1993-2
SUPPLEMENT (the "Agreement"), executed and delivered as of December 1, 1993
with respect to the Series 1993-2 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and
10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i) with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Class A Excess Servicing plus the amount of Class
      B Excess Servicing; and

            (c) the sum of (i) the amount of CCA Available Collections on the
      immediately preceding Distribution Date that were used to fund all or
      part of the Class A Required Amount, the Class B Required Amount, the
      Class A Cumulative Investor Charged-Off Amount or the Class B Cumulative
      Investor Charged-Off Amount



<PAGE>   3




      on such immediately preceding Distribution Date and (ii) the amount of
      any reduction in the CCA Investor Interest resulting from the
      reimbursement of the Class B Cumulative Investor Charged-Off Amount; and

            (d) the sum of any amounts originally allocated to another Series on
      the immediately preceding Distribution Date (regardless of whether any
      such amounts were originally allocated to a Subordinate Series or were
      made available through the Group Finance Charge Collections Reallocation
      Account) that were reallocated to the Series established hereby on such
      immediately preceding Distribution Date to fund all or part of the Class
      A Required Amount, the Class B Required Amount, the Class A Cumulative
      Investor Charged-Off Amount or the Class B Cumulative Investor
      Charged-Off Amount;

as such amount may be reduced pursuant to the provisions of Section 9 to take
into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount
of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such Distribution Date.  In addition, on the first Distribution Date
following an Effective Alternative Credit Support Election, the Available
Subordinated Amount shall be increased by the Additional Subordinated Amount.
In no event, however, shall the Available Subordinated Amount exceed (i)
through the last Distribution Date preceding an Effective Alternative Credit
Support Election, the Initial Subordinated Amount and (ii) thereafter, the
Initial Subordinated Amount plus the Additional Subordinated Amount.

        (b) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

            (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

            (2) A new subsection (a)(6) shall be added as follows:

                (6) On the first Special Payment Date of the Amortization
            Period, if any, after giving effect to the payments and withdrawals
            described above on such day, an amount equal to the lesser of

                    (x) the Series Invested Amount and

                    (y) the amount on deposit in the Series Principal
                        Funding Account

            shall be withdrawn from the Series Principal Funding Account and
            shall be paid to the Investor Certificateholders pursuant to
            Section 5.01 of the Pooling and Servicing Agreement.  Except as set
            forth in the following sentence, all such

                                      2



<PAGE>   4




            amounts shall be paid to the Class A Investor Certificateholders
            until the Class A Invested Amount is reduced to zero; and,
            thereafter, if there is a Subordinate Class with respect to Class
            A, such amounts shall be paid to the Class B Investor
            Certificateholders until the Class B Invested Amount is reduced to
            zero, unless the Series Termination Date occurs prior to such date.
            Notwithstanding the foregoing, if the Special Payment Date is the
            first Special Payment Date following the occurrence of an Economic
            Early Amortization Event, an amount equal to the amount deposited
            into the Series Principal Funding Account pursuant to Section 9 for
            the benefit of the Class B Investor Certificateholders shall be
            paid to the Class B Investor Certificateholders, and not to the
            Class A Investor Certificateholders.  In no event shall any amounts
            be paid with respect to any Class of Investor Certificates pursuant
            to this clause (6) in excess of the Class Invested Amount for such
            Class.  Any amounts remaining on deposit in the Series Principal
            Funding Account after the Class Invested Amount for each Class has
            been reduced to zero shall be paid to the Holder of the Seller
            Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      3


<PAGE>   5



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary



                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------








                                      4



<PAGE>   1


                                                                    Exhibit 4.3

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller


                                     and


                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders

                            ____________________


                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of November 23, 1993

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993

                            ____________________


                                $366,493,000


                        DISCOVER CARD MASTER TRUST I
                         SERIES 1993-3 CERTIFICATES



                                 Dated as of


                                May 15, 1998




<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1993-3 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1993-3
SUPPLEMENT (the "Agreement"), executed and delivered as of November 23, 1993
with respect to the Series 1993-3 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and
10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i) with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Class A Excess Servicing plus the amount of Class
      B Excess Servicing; and

            (c) the sum of (i) the amount of CCA Available Collections on the
      immediately preceding Distribution Date that were used to fund all or
      part of the Class A Required Amount, the Class B Required Amount, the
      Class A Cumulative Investor Charged-Off Amount or the Class B Cumulative
      Investor Charged-Off Amount

                                      2




<PAGE>   3




      on such immediately preceding Distribution Date and (ii) the amount of
      any reduction in the CCA Investor Interest resulting from the
      reimbursement of the Class B Cumulative Investor Charged-Off Amount; and

            (d) the sum of any amounts originally allocated to another Series on
      the immediately preceding Distribution Date (regardless of whether any
      such amounts were originally allocated to a Subordinate Series or were
      made available through the Group Finance Charge Collections Reallocation
      Account) that were reallocated to the Series established hereby on such
      immediately preceding Distribution Date to fund all or part of the Class
      A Required Amount, the Class B Required Amount, the Class A Cumulative
      Investor Charged-Off Amount or the Class B Cumulative Investor
      Charged-Off Amount;

as such amount may be reduced pursuant to the provisions of Section 9 to take
into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount
of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such Distribution Date.  In addition, on the first Distribution Date
following an Effective Alternative Credit Support Election, the Available
Subordinated Amount shall be increased by the Additional Subordinated Amount.
In no event, however, shall the Available Subordinated Amount exceed (i)
through the last Distribution Date preceding an Effective Alternative Credit
Support Election, the Initial Subordinated Amount and (ii) thereafter, the
Initial Subordinated Amount plus the Additional Subordinated Amount.

        (b) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

            (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

            (2) A new subsection (a)(6) shall be added as follows:

                (6) On the first Special Payment Date of the Amortization
            Period, if any, after giving effect to the payments and withdrawals
            described above on such day, an amount equal to the lesser of

                    (x) the Series Invested Amount and

                    (y) the amount on deposit in the Series Principal
                        Funding Account

            shall be withdrawn from the Series Principal Funding Account and
            shall be paid to the Investor Certificateholders pursuant to
            Section 5.01 of the Pooling and Servicing Agreement.  Except as set
            forth in the following sentence, all such

                                      3



<PAGE>   4




            amounts shall be paid to the Class A Investor Certificateholders
            until the Class A Invested Amount is reduced to zero; and,
            thereafter, if there is a Subordinate Class with respect to Class
            A, such amounts shall be paid to the Class B Investor
            Certificateholders until the Class B Invested Amount is reduced to
            zero, unless the Series Termination Date occurs prior to such date.
            Notwithstanding the foregoing, if the Special Payment Date is the
            first Special Payment Date following the occurrence of an Economic
            Early Amortization Event, an amount equal to the amount deposited
            into the Series Principal Funding Account pursuant to Section 9 for
            the benefit of the Class B Investor Certificateholders shall be
            paid to the Class B Investor Certificateholders, and not to the
            Class A Investor Certificateholders.  In no event shall any amounts
            be paid with respect to any Class of Investor Certificates pursuant
            to this clause (6) in excess of the Class Invested Amount for such
            Class.  Any amounts remaining on deposit in the Series Principal
            Funding Account after the Class Invested Amount for each Class has
            been reduced to zero shall be paid to the Holder of the Seller
            Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      4



<PAGE>   5


     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President




                                      5



<PAGE>   1



                                                                    Exhibit 4.4

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    SECOND AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of October 14, 1994

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                                $894,737,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1994-2 CERTIFICATES


                                 Dated as of
                                May 15, 1998




<PAGE>   2




     THIS SECOND AMENDMENT TO THE SERIES 1994-2 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST 
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1994-2
SUPPLEMENT (the "Agreement"), executed and delivered as of October 14, 1994
with respect to the Series 1994-2 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such




<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (24) of Section 9(b) shall be amended by deleting such 
clause in its entirety and replacing it with the following:

     (24)   The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

     (A)    An amount equal to the lesser of

            (x) the Class Required Amount Shortfall and

            (y) the product of

                (1) a fraction the numerator of which is the Class Required
                    Amount Shortfall and the denominator of which is the sum
                    of the Class Required Amount Shortfalls for all Classes
                    designated by the same letter of the alphabet of all Series
                    in the Group to which the Series established hereby belongs
                    (after giving effect to provisions in the applicable Series
                    Supplements substantially similar to the clauses preceding
                    this clause (24)) and

                (2) the amount on deposit in the Group Finance Charge
                    Collections Reallocation Account before any withdrawals 
                    therefrom with respect to any other Series pursuant to a 
                    comparable clause in the applicable Series Supplements,

                                      2



<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B)    An amount equal to the lesser of

            (x) the Class Cumulative Investor Charged-Off Amount and

            (y) the product of

                (1) a fraction the numerator of which is the Class Cumulative
                    Investor Charged-Off Amount and the denominator of 
                    which is the sum of the Class Cumulative Investor
                    Charged-Off Amounts for all Classes designated by the same
                    letter of the alphabet of all Series in the Group to which
                    the Series established hereby belongs (after giving effect
                    to provisions in the applicable Series Supplements
                    substantially similar to the clauses preceding this clause
                    (24)) and

                (2) the amount on deposit in the Group Finance Charge
                    Collections Reallocation Account before any withdrawals
                    therefrom with respect to any other Series pursuant to a
                    comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

            (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

            (B) If there is a Subordinate Class with respect to Class A, an 
            amount equal to the lesser of

            (x) the amount by which the Available Class B Credit Enhancement 
                Amount is less than the Maximum Class B Credit Enhancement 
                Amount and

            (y) the product of


                                      3


<PAGE>   5




                (1)  a fraction, the numerator of which is the amount by which 
                     the Available Class B Credit Enhancement Amount is
                     less than the Maximum Class B Credit Enhancement Amount
                     and the denominator of which is the sum of, for each
                     Series in the Group of which the Series established hereby
                     is a member, the amount by which the Available Class B
                     Credit Enhancement Amount for such Series is less than the
                     Maximum Class B Credit Enhancement Amount for such Series
                     (after giving effect to provisions in the applicable
                     Series Supplements substantially similar to the clauses
                     preceding this clause (25)) and

                (2)  the amount on deposit in the Group Finance Charge 
                     Collections Reallocation Account before any withdrawals
                     therefrom with respect to any other Series pursuant to a
                     comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

           (c)  Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

           (1)  Subsection (a)(6) shall be renumbered as subsection (a)(7).

           (2)  A new subsection (a)(6) shall be added as follows:

                (6)  On the first Special Payment Date of the Amortization
           Period, if any, after giving effect to the payments and withdrawals
           described above on such day, an amount equal to the lesser of

                     (x) the Series Invested Amount and

                     (y) the amount on deposit in the Series Principal Funding 
                         Account

           shall be withdrawn from the Series Principal Funding Account and     
           shall be paid to the Investor Certificateholders pursuant to Section
           5.01 of the Pooling and Servicing Agreement.  Except as set forth in
           the following sentence, all such amounts shall be paid to the Class
           A Investor Certificateholders until the Class A Invested Amount is
           reduced to zero; and, thereafter, if there is a Subordinate Class
           with respect to Class A, such amounts shall be paid to the Class B
           Investor Certificateholders until the Class B Invested Amount is
           reduced to zero, unless the

                                      4




<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      5


<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------



                                      6


<PAGE>   1


                                                                    Exhibit 4.5
                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of October 20, 1994

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                                $789,474,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1994-3 CERTIFICATES


                                 Dated as of
                                May 15, 1998



<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1994-3 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1994-3
SUPPLEMENT (the "Agreement"), executed and delivered as of October 20, 1994
with respect to the Series 1994-3 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

        (a) (i)  with respect to the first Distribution Date, the Initial
   Subordinated Amount or (ii) with respect to any other Distribution Date,     
   the Available Subordinated Amount after giving effect to all adjustments on 
   the prior Distribution Date; and

        (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such



<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

          (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

          (1) Clause (24) of Section 9(b) shall be amended by deleting such 
clause in its entirety and replacing it with the following:

     (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

     (A)  An amount equal to the lesser of

          (x) the Class Required Amount Shortfall and

          (y) the product of

              (1) a fraction the numerator of which is the Class Required
                  Amount Shortfall and the denominator of which is the sum
                  of the Class Required Amount Shortfalls for all Classes
                  designated by the same letter of the alphabet of all Series
                  in the Group to which the Series established hereby belongs
                  (after giving effect to provisions in the applicable Series
                  Supplements substantially similar to the clauses preceding
                  this clause (24)) and

              (2) the amount on deposit in the Group Finance Charge Collections 
                  Reallocation Account before any withdrawals therefrom
                  with respect to any other Series pursuant to a comparable
                  clause in the applicable Series Supplements,

                                      2



<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B)  An amount equal to the lesser of

          (x) the Class Cumulative Investor Charged-Off Amount and

          (y) the product of

              (1) a fraction the numerator of which is the Class Cumulative
                  Investor Charged-Off Amount and the denominator of 
                  which is the sum of the Class Cumulative Investor Charged-Off
                  Amounts for all Classes designated by the same letter of the
                  alphabet of all Series in the Group to which the Series
                  established hereby belongs (after giving effect to provisions
                  in the applicable Series Supplements substantially similar to
                  the clauses preceding this clause (24)) and

              (2) the amount on deposit in the Group Finance Charge Collections 
                  Reallocation Account before any withdrawals therefrom
                  with respect to any other Series pursuant to a comparable
                  clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

          (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

          (B) If there is a Subordinate Class with respect to Class A, an amount
equal to the lesser of

          (x) the amount by which the Available Class B Credit Enhancement 
              Amount is less than the Maximum Class B Credit Enhancement 
              Amount and

          (y) the product of


                                      3



<PAGE>   5




              (1)  a fraction, the numerator of which is the amount by which 
                   the Available Class B Credit Enhancement Amount is
                   less than the Maximum Class B Credit Enhancement Amount and
                   the denominator of which is the sum of, for each Series in
                   the Group of which the Series established hereby is a
                   member, the amount by which the Available Class B Credit
                   Enhancement Amount for such Series is less than the Maximum
                   Class B Credit Enhancement Amount for such Series (after
                   giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

              (2)  the amount on deposit in the Group Finance Charge 
                   Collections Reallocation Account before any withdrawals
                   therefrom with respect to any other Series pursuant to a
                   comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

          (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

          (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

          (2) A new subsection (a)(6) shall be added as follows:

              (6) On the first Special Payment Date of the Amortization
      Period, if any, after giving effect to the payments and withdrawals
      described above on such day, an amount equal to the lesser of

                  (x) the Series Invested Amount and

                  (y) the amount on deposit in the Series Principal Funding 
                      Account

      shall be withdrawn from the Series Principal Funding Account and  shall
      be paid to the Investor Certificateholders pursuant to Section 5.01 of
      the Pooling and Servicing Agreement.  Except as set forth in the
      following sentence, all such amounts shall be paid to the Class A
      Investor Certificateholders until the Class A Invested Amount is reduced
      to zero; and, thereafter, if there is a Subordinate Class with respect to
      Class A, such amounts shall be paid to the Class B Investor
      Certificateholders until the Class B Invested Amount is reduced to zero,
      unless the

                                      4


<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      5


<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------


                                      6



<PAGE>   1


                                                                    Exhibit 4.6
                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                         Dated as of April 19, 1995

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                                $631,579,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1995-1 CERTIFICATES


                                 Dated as of
                                May 15, 1998



<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1995-1 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1995-1
SUPPLEMENT (the "Agreement"), executed and delivered as of April 19, 1995 with
respect to the Series 1995-1 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

        (a) (i)  with respect to the first Distribution Date, the Initial
   Subordinated Amount or (ii) with respect to any other Distribution Date,
   the Available Subordinated Amount after giving effect to all adjustments
   on the prior Distribution Date; and

        (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such



<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

        (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

        (1) Clause (24) of Section 9(b) shall be amended by deleting such clause
in its entirety and replacing it with the following:

   (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

   (A)  An amount equal to the lesser of

        (x) the Class Required Amount Shortfall and

        (y) the product of

            (1) a fraction the numerator of which is the Class Required Amount 
                Shortfall and the denominator of which is the sum of the
                Class Required Amount Shortfalls for all Classes designated by
                the same letter of the alphabet of all Series in the Group to
                which the Series established hereby belongs (after giving
                effect to provisions in the applicable Series Supplements
                substantially similar to the clauses preceding this clause
                (24)) and

            (2) the amount on deposit in the Group Finance Charge Collections 
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

                                      2


<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

   (B)  An amount equal to the lesser of

        (x) the Class Cumulative Investor Charged-Off Amount and

        (y) the product of

            (1) a fraction the numerator of which is the Class Cumulative
                Investor Charged-Off Amount and the denominator of which is
                the sum of the Class Cumulative Investor Charged-Off Amounts
                for all Classes designated by the same letter of the alphabet
                of all Series in the Group to which the Series established
                hereby belongs (after giving effect to provisions in the
                applicable Series Supplements substantially similar to the
                clauses preceding this clause (24)) and

            (2) the amount on deposit in the Group Finance Charge Collections 
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

        (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

        (B) If there is a Subordinate Class with respect to Class A, an amount
equal to the lesser of

        (x) the amount by which the Available Class B Credit Enhancement 
            Amount is less than the Maximum Class B Credit Enhancement Amount 
            and

        (y) the product of


                                      3


<PAGE>   5




            (1) a fraction, the numerator of which is the amount by which the 
                Available Class B Credit Enhancement Amount is less than
                the Maximum Class B Credit Enhancement Amount and the
                denominator of which is the sum of, for each Series in the
                Group of which the Series established hereby is a member, the
                amount by which the Available Class B Credit Enhancement Amount
                for such Series is less than the Maximum Class B Credit
                Enhancement Amount for such Series (after giving effect to
                provisions in the applicable Series Supplements substantially
                similar to the clauses preceding this clause (25)) and

            (2) the amount on deposit in the Group Finance Charge Collections 
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

        (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

        (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

        (2) A new subsection (a)(6) shall be added as follows:

            (6) On the first Special Payment Date of the Amortization
    Period, if any, after giving effect to the payments and withdrawals
    described above on such day, an amount equal to the lesser of

                (x) the Series Invested Amount and

                (y) the amount on deposit in the Series Principal Funding 
                    Account

    shall be withdrawn from the Series Principal Funding Account and    shall
    be paid to the Investor Certificateholders pursuant to Section 5.01 of the
    Pooling and Servicing Agreement.  Except as set forth in the following
    sentence, all such amounts shall be paid to the Class A Investor
    Certificateholders until the Class A Invested Amount is reduced to zero;
    and, thereafter, if there is a Subordinate Class with respect to Class A,
    such amounts shall be paid to the Class B Investor Certificateholders until
    the Class B Invested Amount is reduced to zero, unless the

                                      4


<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      5



<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.
                            
                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller

                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------

                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------



                                      6

<PAGE>   1


                                                                    Exhibit 4.7

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                         Dated as of August 1, 1995

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                                $526,316,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1995-2 CERTIFICATES


                                 Dated as of

                                May 15, 1998




<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1995-2 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1995-2
SUPPLEMENT (the "Agreement"), executed and delivered as of August 1, 1995 with
respect to the Series 1995-2 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

        (a) (i)  with respect to the first Distribution Date, the Initial
  Subordinated Amount or (ii) with respect to any other Distribution Date,
  the Available Subordinated Amount after giving effect to all adjustments
  on the prior Distribution Date; and

        (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such




<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

        (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

        (1) Clause (24) of Section 9(b) shall be amended by deleting such clause
in its entirety and replacing it with the following:

   (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

   (A)  An amount equal to the lesser of

        (x) the Class Required Amount Shortfall and

        (y) the product of

            (1) a fraction the numerator of which is the Class Required
                Amount Shortfall and the denominator of which is the sum
                of the Class Required Amount Shortfalls for all Classes
                designated by the same letter of the alphabet of all Series in
                the Group to which the Series established hereby belongs (after
                giving effect to provisions in the applicable Series
                Supplements substantially similar to the clauses preceding this
                clause (24)) and

            (2) the amount on deposit in the Group Finance Charge Collections 
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

                                      2



<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

   (B) An amount equal to the lesser of

       (x) the Class Cumulative Investor Charged-Off Amount and

       (y) the product of

           (1) a fraction the numerator of which is the Class Cumulative
               Investor Charged-Off Amount and the denominator of which is
               the sum of the Class Cumulative Investor Charged-Off Amounts for
               all Classes designated by the same letter of the alphabet of all
               Series in the Group to which the Series established hereby
               belongs (after giving effect to provisions in the applicable
               Series Supplements substantially similar to the clauses
               preceding this clause (24)) and

           (2) the amount on deposit in the Group Finance Charge Collections 
               Reallocation Account before any withdrawals therefrom with
               respect to any other Series pursuant to a comparable clause in
               the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

       (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

       (B) If there is a Subordinate Class with respect to Class A, an amount
equal to the lesser of

       (x) the amount by which the Available Class B Credit Enhancement Amount 
           is less than the Maximum Class B Credit Enhancement Amount and

       (y) the product of
       
                                      3



<PAGE>   5




           (1)  a fraction, the numerator of which is the amount by which the 
                Available Class B Credit Enhancement Amount is less than
                the Maximum Class B Credit Enhancement Amount and the
                denominator of which is the sum of, for each Series in the
                Group of which the Series established hereby is a member, the
                amount by which the Available Class B Credit Enhancement Amount
                for such Series is less than the Maximum Class B Credit
                Enhancement Amount for such Series (after giving effect to
                provisions in the applicable Series Supplements substantially
                similar to the clauses preceding this clause (25)) and

           (2)  the amount on deposit in the Group Finance Charge Collections 
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

       (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

       (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

       (2) A new subsection (a)(6) shall be added as follows:

           (6) On the first Special Payment Date of the Amortization
    Period, if any, after giving effect to the payments and withdrawals
    described above on such day, an amount equal to the lesser of

               (x) the Series Invested Amount and

               (y) the amount on deposit in the Series Principal Funding Account


    shall be withdrawn from the Series Principal Funding Account and shall
    be paid to the Investor Certificateholders pursuant to Section 5.01 of the
    Pooling and Servicing Agreement.  Except as set forth in the following
    sentence, all such amounts shall be paid to the Class A Investor
    Certificateholders until the Class A Invested Amount is reduced to zero;
    and, thereafter, if there is a Subordinate Class with respect to Class A,
    such amounts shall be paid to the Class B Investor Certificateholders until
    the Class B Invested Amount is reduced to zero, unless the

                                      4


<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      5



<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------

                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------




                                      6


<PAGE>   1


                                                                    Exhibit 4.8


                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                       Dated as of September 28, 1995

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                                $526,316,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1995-3 CERTIFICATES


                                 Dated as of


                                May 15, 1998




<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1995-3 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1995-3
SUPPLEMENT (the "Agreement"), executed and delivered as of September 28, 1995
with respect to the Series 1995-3 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

        (a) (i)  with respect to the first Distribution Date, the Initial
  Subordinated Amount or (ii) with respect to any other Distribution Date,
  the Available Subordinated Amount after giving effect to all adjustments
  on the prior Distribution Date; and

        (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such




<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

         (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

          (1) Clause (24) of Section 9(b) shall be amended by deleting such 
clause in its entirety and replacing it with the following:

     (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

     (A)  An amount equal to the lesser of

          (x) the Class Required Amount Shortfall and

          (y) the product of

              (1) a fraction the numerator of which is the Class Required
                  Amount Shortfall and the denominator of which is the sum
                  of the Class Required Amount Shortfalls for all Classes
                  designated by the same letter of the alphabet of all Series
                  in the Group to which the Series established hereby belongs
                  (after giving effect to provisions in the applicable Series
                  Supplements substantially similar to the clauses preceding
                  this clause (24)) and

              (2) the amount on deposit in the Group Finance Charge
                  Collections Reallocation Account before any withdrawals
                  therefrom with respect to any other Series pursuant to a
                  comparable clause in the applicable Series Supplements,

                                      2



<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B) An amount equal to the lesser of

         (x) the Class Cumulative Investor Charged-Off Amount and

         (y) the product of

             (1) a fraction the numerator of which is the Class Cumulative
                 Investor Charged-Off Amount and the denominator of 
                 which is the sum of the Class Cumulative Investor Charged-Off
                 Amounts for all Classes designated by the same letter of the
                 alphabet of all Series in the Group to which the Series
                 established hereby belongs (after giving effect to provisions
                 in the applicable Series Supplements substantially similar to
                 the clauses preceding this clause (24)) and

             (2) the amount on deposit in the Group Finance Charge Collections 
                 Reallocation Account before any withdrawals therefrom
                 with respect to any other Series pursuant to a comparable
                 clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

         (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (B) If there is a Subordinate Class with respect to Class A, an amount
             equal to the lesser of

         (x) the amount by which the Available Class B Credit Enhancement 
             Amount is less than the Maximum Class B Credit Enhancement Amount 
             and

         (y) the product of


                                      3



<PAGE>   5




             (1)  a fraction, the numerator of which is the amount by which 
                  the Available Class B Credit Enhancement Amount is less than
                  the Maximum Class B Credit Enhancement Amount and the
                  denominator of which is the sum of, for each Series in the
                  Group of which the Series established hereby is a member, the
                  amount by which the Available Class B Credit Enhancement
                  Amount for such Series is less than the Maximum Class B
                  Credit Enhancement Amount for such Series (after giving
                  effect to provisions in the applicable Series Supplements
                  substantially similar to the clauses preceding this clause
                  (25)) and

             (2)  the amount on deposit in the Group Finance Charge Collections
                  Reallocation Account before any withdrawals therefrom with
                  respect to any other Series pursuant to a comparable clause
                  in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

         (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

         (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

         (2) A new subsection (a)(6) shall be added as follows:

             (6) On the first Special Payment Date of the Amortization
    Period, if any, after giving effect to the payments and withdrawals
    described above on such day, an amount equal to the lesser of

                 (x) the Series Invested Amount and

                 (y) the amount on deposit in the Series Principal Funding 
                     Account

    shall be withdrawn from the Series Principal Funding Account and shall
    be paid to the Investor Certificateholders pursuant to Section 5.01 of the
    Pooling and Servicing Agreement.  Except as set forth in the following
    sentence, all such amounts shall be paid to the Class A Investor
    Certificateholders until the Class A Invested Amount is reduced to zero;
    and, thereafter, if there is a Subordinate Class with respect to Class A,
    such amounts shall be paid to the Class B Investor Certificateholders until
    the Class B Invested Amount is reduced to zero, unless the

                                      4



<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby 
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      5


<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.


                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller


                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------



                                      6


<PAGE>   1


                                                                    Exhibit 4.9

                           GREENWOOD TRUST COMPANY

                    Master Servicer, Servicer and Seller

                                     and

                       U.S. BANK NATIONAL ASSOCIATION

                                   Trustee

                     on behalf of the Certificateholders




                    FIRST AMENDMENT TO SERIES SUPPLEMENT

                        Dated as of January 18, 1996

                                     to

                       POOLING AND SERVICING AGREEMENT

                         Dated as of October 1, 1993



                               $1,052,632,000

                        DISCOVER CARD MASTER TRUST I
                         SERIES 1996-1 CERTIFICATES


                                 Dated as of

                                May 15, 1998




<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1996-1 SUPPLEMENT (the "Amendment"), 
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and
Seller ("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank
National Association, successor trustee to Bank of America Illinois, formerly
Continental Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1996-1
SUPPLEMENT (the "Agreement"), executed and delivered as of January 18, 1996
with respect to the Series 1996-1 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

        (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

        (a) (i)  with respect to the first Distribution Date, the Initial
   Subordinated Amount or (ii) with respect to any other Distribution Date,
   the Available Subordinated Amount after giving effect to all adjustments
   on the prior Distribution Date; and

        (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used
to reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the
amount of Class B Excess Servicing used to reduce the Class A Required Amount
Shortfall, (iii) the amount of the Class B Subordinated Payment and (iv) the
amount of any reduction in the Class B Investor Interest resulting from the
reimbursement of the Class A Cumulative Investor Charged-Off Amount, in each
case for such




<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased
by the Additional Subordinated Amount.  In no event, however, shall the
Available Subordinated Amount exceed (i) through the last Distribution Date
preceding an Effective Alternative Credit Support Election, the Initial
Subordinated Amount plus the Supplemental Subordinated Amount and (ii)
thereafter, the sum of the Initial Subordinated Amount, the Supplemental
Subordinated Amount and the Additional Subordinated Amount.

          (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

          (1) Clause (24) of Section 9(b) shall be amended by deleting such 
clause in its entirety and replacing it with the following:

     (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

     (A)  An amount equal to the lesser of

          (x) the Class Required Amount Shortfall and

          (y) the product of

              (1) a fraction the numerator of which is the Class Required
                  Amount Shortfall and the denominator of which is the sum
                  of the Class Required Amount Shortfalls for all Classes
                  designated by the same letter of the alphabet of all Series
                  in the Group to which the Series established hereby belongs
                  (after giving effect to provisions in the applicable Series
                  Supplements substantially similar to the clauses preceding
                  this clause (24)) and

              (2) the amount on deposit in the Group Finance Charge Collections
                  Reallocation Account before any withdrawals therefrom
                  with respect to any other Series pursuant to a comparable
                  clause in the applicable Series Supplements,

                                      2



<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B)  An amount equal to the lesser of

          (x) the Class Cumulative Investor Charged-Off Amount and

          (y) the product of

              (1) a fraction the numerator of which is the Class Cumulative
                  Investor Charged-Off Amount and the denominator of 
                  which is the sum of the Class Cumulative Investor Charged-Off
                  Amounts for all Classes designated by the same letter of the
                  alphabet of all Series in the Group to which the Series
                  established hereby belongs (after giving effect to provisions
                  in the applicable Series Supplements substantially similar to
                  the clauses preceding this clause (24)) and

              (2) the amount on deposit in the Group Finance Charge Collections 
                  Reallocation Account before any withdrawals therefrom
                  with respect to any other Series pursuant to a comparable
                  clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

          (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

          (B) If there is a Subordinate Class with respect to Class A, an amount
          equal to the lesser of

          (x) the amount by which the Available Class B Credit Enhancement 
              Amount is less than the Maximum Class B Credit Enhancement 
              Amount and

          (y) the product of


                                      3


<PAGE>   5




              (1)  a fraction, the numerator of which is the amount by which 
                   the Available Class B Credit Enhancement Amount is
                   less than the Maximum Class B Credit Enhancement Amount and
                   the denominator of which is the sum of, for each Series in
                   the Group of which the Series established hereby is a
                   member, the amount by which the Available Class B Credit
                   Enhancement Amount for such Series is less than the Maximum
                   Class B Credit Enhancement Amount for such Series (after
                   giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

              (2)  the amount on deposit in the Group Finance Charge 
                   Collections Reallocation Account before any withdrawals
                   therefrom with respect to any other Series pursuant to a
                   comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

          (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

          (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

          (2) A new subsection (a)(6) shall be added as follows:

              (6) On the first Special Payment Date of the Amortization
    Period, if any, after giving effect to the payments and withdrawals
    described above on such day, an amount equal to the lesser of

                  (x) the Series Invested Amount and

                  (y) the amount on deposit in the Series Principal Funding 
                      Account

    shall be withdrawn from the Series Principal Funding Account and shall
    be paid to the Investor Certificateholders pursuant to Section 5.01 of the
    Pooling and Servicing Agreement.  Except as set forth in the following
    sentence, all such amounts shall be paid to the Class A Investor
    Certificateholders until the Class A Invested Amount is reduced to zero;
    and, thereafter, if there is a Subordinate Class with respect to Class A,
    such amounts shall be paid to the Class B Investor Certificateholders until
    the Class B Invested Amount is reduced to zero, unless the

                                      4



<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth 
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      5



<PAGE>   7



     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                            GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller



                            By:    /s/ John J. Coane
                                   ---------------------------------------
                            Name:  John J. Coane
                                   ---------------------------------------
                            Title: Vice President, Director of Accounting, 
                                   ---------------------------------------
                                   Treasurer and Assistant Secretary
                                   ---------------------------------------


                            U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                            By:    /s/ Patricia M. Trlak
                                   ---------------------------------------
                            Name:  Patricia M. Trlak
                                   ---------------------------------------
                            Title: Vice President
                                   ---------------------------------------



                                      6



<PAGE>   1



                                                                    Exhibit 4.10

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of January 29, 1996

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $947,369,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1996-2 CERTIFICATES


                                  Dated as of
                                 May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1996-2 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1996-2
SUPPLEMENT (the "Agreement"), executed and delivered as of January 29, 1996
with respect to the Series 1996-2 Certificates, pursuant to Section 6.06 of
that certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9
and 10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

     (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
     Subordinated Amount or (ii) with respect to any other Distribution Date,
     the Available Subordinated Amount after giving effect to all adjustments on
     the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

           (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

           (1) Clause (24) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

     (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

     (A) An amount equal to the lesser of

        (x) the Class Required Amount Shortfall and

        (y) the product of

           (1)    a fraction the numerator of which is the Class Required Amount
                  Shortfall and the denominator of which is the sum of the Class
                  Required Amount Shortfalls for all Classes designated by the
                  same letter of the alphabet of all Series in the Group to
                  which the Series established hereby belongs (after giving
                  effect to provisions in the applicable Series Supplements
                  substantially similar to the clauses preceding this clause
                  (24)) and

           (2)   the amount on deposit in the Group Finance Charge Collections
                 Reallocation Account before any withdrawals therefrom with
                 respect to any other Series pursuant to a comparable clause in
                 the applicable Series Supplements,

                                       2




<PAGE>   4
shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B)    An amount equal to the lesser of

           (x) the Class Cumulative Investor Charged-Off Amount and

           (y) the product of

               (1) a fraction the numerator of which is the Class Cumulative
                   Investor Charged-Off Amount and the denominator of  which is
                   the sum of the Class Cumulative Investor Charged-Off Amounts
                   for all Classes designated by the same letter of the alphabet
                   of all Series in the Group to which the Series established
                   hereby belongs (after giving effect to provisions in the
                   applicable Series Supplements substantially similar to the
                   clauses preceding this clause (24)) and

               (2) the amount on deposit in the Group Finance Charge Collections
                   Reallocation Account before any withdrawals therefrom with
                   respect to any other Series pursuant to a comparable clause
                   in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

           (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

           (B) If there is a Subordinate Class with respect to Class A, an
           amount equal to the lesser of

           (x)  the amount by which the Available Class B Credit Enhancement
                Amount is less than the Maximum Class B Credit Enhancement 
                Amount and

           (y)  the product of


                                       3




<PAGE>   5




                         (1)  a fraction, the numerator of which is the amount
                              by which the Available Class B Credit Enhancement
                              Amount is less than the Maximum Class B Credit
                              Enhancement Amount and the denominator of which is
                              the sum of, for each Series in the Group of which
                              the Series established hereby is a member, the
                              amount by which the Available Class B Credit
                              Enhancement Amount for such Series is less than
                              the Maximum Class B Credit Enhancement Amount for
                              such Series (after giving effect to provisions in
                              the applicable Series Supplements substantially
                              similar to the clauses preceding this clause (25))
                              and

                         (2)  the amount on deposit in the Group Finance Charge
                              Collections Reallocation Account before any
                              withdrawals therefrom with respect to any other
                              Series pursuant to a comparable clause in the
                              applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

      (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

      (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

      (2) A new subsection (a)(6) shall be added as follows:

            (6) On the first Special Payment Date of the Amortization Period, if
      any, after giving effect to the payments and withdrawals described above
      on such day, an amount equal to the lesser of

                       (x) the Series Invested Amount and

                       (y) the amount on deposit in the Series Principal
                           Funding Account

      shall be withdrawn from the Series Principal Funding Account and shall be
      paid to the Investor Certificateholders pursuant to Section 5.01 of the
      Pooling and Servicing Agreement.  Except as set forth in the following
      sentence, all such amounts shall be paid to the Class A Investor
      Certificateholders until the Class A Invested Amount is reduced to zero;
      and, thereafter, if there is a Subordinate Class with respect to Class A,
      such amounts shall be paid to the Class B Investor Certificateholders
      until the Class B Invested Amount is reduced to zero, unless the

                                       4




<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit in
            the Series Principal Funding Account after the Class Invested Amount
            for each Class has been reduced to zero shall be paid to the Holder
            of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.

                                       5
<PAGE>   7
      IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                              GREENWOOD TRUST COMPANY, 
                               as Master Servicer, Servicer and Seller



                              By:    /s/ John J. Coane 
                                     ----------------- 

                              Name : John J. Coane 
                                     -----------------
                              Title: Vice President, Director of Accounting, 
                                     Treasurer and Assistant Secretary
                                     ---------------------------------


                              U.S. BANK NATIONAL ASSOCIATION, 
                                as Trustee


                              By:    /s/ Patricia M. Trlak 
                                     ---------------------
                              Name:  Patricia M. Trlak 
                                     ------------------
                              Title: Vice President
                                     ----------------




                                       6



<PAGE>   1


                           
                                                                    Exhibit 4.11
                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                         Dated as of February 21, 1996

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $631,579,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1996-3 CERTIFICATES


                                  Dated as of
                                  May 15, 1998





<PAGE>   2



      THIS FIRST AMENDMENT TO THE SERIES 1996-3 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

      WHEREAS Greenwood and the Trustee have entered into the SERIES 1996-3
SUPPLEMENT (the "Agreement"), executed and delivered as of February 21, 1996
with respect to the Series 1996-3 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

      WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9 and
10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

      1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

      2. Amendment to the Agreement.

          (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

      "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

          (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

          (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

         (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

         (1) Clause (24) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

      (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

      (A) An amount equal to the lesser of

         (x) the Class Required Amount Shortfall and

         (y) the product of

             (1)  a fraction the numerator of which is the Class Required Amount
                  Shortfall and the denominator of which is the sum of the Class
                  Required Amount Shortfalls for all Classes designated by the
                  same letter of the alphabet of all Series in the Group to
                  which the Series established hereby belongs (after giving
                  effect to provisions in the applicable Series Supplements
                  substantially similar to the clauses preceding this clause
                  (24)) and

             (2)  the amount on deposit in the Group Finance Charge Collections
                  Reallocation Account before any withdrawals therefrom with
                  respect to any other Series pursuant to a comparable clause
                  in the applicable Series Supplements,

                                       2




<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

      (B) An amount equal to the lesser of

          (x) the Class Cumulative Investor Charged-Off Amount and
 
          (y) the product of

             (1) a fraction the numerator of which is the Class Cumulative
                 Investor Charged-Off Amount and the denominator of  which is
                 the sum of the Class Cumulative Investor Charged-Off Amounts
                 for all Classes designated by the same letter of the alphabet
                 of all Series in the Group to which the Series established
                 hereby belongs (after giving effect to provisions in the
                 applicable Series Supplements substantially similar to the
                 clauses preceding this clause (24)) and

             (2) the amount on deposit in the Group Finance Charge Collections
                 Reallocation Account before any withdrawals therefrom with
                 respect to any other Series pursuant to a comparable clause in
                 the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

      (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

      (B) If there is a Subordinate Class with respect to Class A, an amount
      equal to the lesser of

             (x)  the amount by which the Available Class B Credit Enhancement
                  Amount is less than the Maximum Class B Credit Enhancement
                  Amount and

             (y)  the product of


                                       3




<PAGE>   5




                       (1)  a fraction, the numerator of which is the amount by
                            which the Available Class B Credit Enhancement
                            Amount is less than the Maximum Class B Credit
                            Enhancement Amount and the denominator of which is
                            the sum of, for each Series in the Group of which
                            the Series established hereby is a member, the
                            amount by which the Available Class B Credit
                            Enhancement Amount for such Series is less than the
                            Maximum Class B Credit Enhancement Amount for such
                            Series (after giving effect to provisions in the
                            applicable Series Supplements substantially similar
                            to the clauses preceding this clause (25)) and

                       (2)  the amount on deposit in the Group Finance Charge
                            Collections Reallocation Account before any
                            withdrawals therefrom with respect to any other
                            Series pursuant to a comparable clause in the
                            applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

                   (c) Effective as of the date hereof, Section 10 ("Payments")
of the Agreement is amended as follows:

                   (1) Subsection (a)(6) shall be renumbered as subsection
                       (a)(7).

                   (2) A new subsection (a)(6) shall be added as follows:

                       (6) On the first Special Payment Date of the Amortization
            Period, if any, after giving effect to the payments and withdrawals
            described above on such day, an amount equal to the lesser of

                         (x) the Series Invested Amount and

                         (y) the amount on deposit in the Series Principal
                             Funding Account

            shall be withdrawn from the Series Principal Funding Account and
            shall be paid to the Investor Certificateholders pursuant to Section
            5.01 of the Pooling and Servicing Agreement.  Except as set forth in
            the following sentence, all such amounts shall be paid to the Class
            A Investor Certificateholders until the Class A Invested Amount is
            reduced to zero; and, thereafter, if there is a Subordinate Class
            with respect to Class A, such amounts shall be paid to the Class B
            Investor Certificateholders until the Class B Invested Amount is
            reduced to zero, unless the

                                       4




<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit
            in the Series Principal Funding Account after the Class Invested
            Amount for each Class has been reduced to zero shall be paid to the
            Holder of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.

                                      5

<PAGE>   7

      IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                              GREENWOOD TRUST COMPANY, 
                               as Master Servicer, Servicer and Seller



                              By:    /s/ John J. Coane 
                                     -----------------

                              Name:  John J. Coane
                                     -----------------
                              Title: Vice President, Director of Accounting,
                                     Treasurer and Assistant Secretary
                                     ---------------------------------


                              U.S. BANK NATIONAL ASSOCIATION, 
                                as Trustee


                              By:    /s/ Patricia M. Trlak 
                                     ----------------------
                              Name:  Patricia M. Trlak 
                                     ------------------
                              Title: Vice President
                                     --------------



                                      6


<PAGE>   1


                                                                    Exhibit 4.12

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                           Dated as of April 30, 1996

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                 $1,052,632,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1996-4 CERTIFICATES


                                  Dated as of
                                 May 15, 1998





<PAGE>   2




      THIS FIRST AMENDMENT TO THE SERIES 1996-4 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

      WHEREAS Greenwood and the Trustee have entered into the SERIES 1996-4
SUPPLEMENT (the "Agreement"), executed and delivered as of April 30, 1996 with
respect to the Series 1996-4 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

      WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1, 9 and
10 of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

           (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

      "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

           (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

           (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (24) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

      (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

            (A) An amount equal to the lesser of

               (x) the Class Required Amount Shortfall and

               (y) the product of

                         (1) a fraction the numerator of which is the Class
                             Required Amount Shortfall and the denominator of
                             which is the sum of the Class Required Amount
                             Shortfalls for all Classes designated by the same
                             letter of the alphabet of all Series in the Group
                             to which the Series established hereby belongs
                             (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (24)) and

               (2) the amount on deposit in the Group Finance Charge Collections
                   Reallocation Account before any withdrawals therefrom with
                   respect to any other Series pursuant to a comparable clause
                   in the applicable Series Supplements,

                                       2




<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

      (B) An amount equal to the lesser of

         (x) the Class Cumulative Investor Charged-Off Amount and

         (y) the product of

            (1) a fraction the numerator of which is the Class Cumulative
                Investor Charged-Off Amount and the denominator of  which is the
                sum of the Class Cumulative Investor Charged-Off Amounts for all
                Classes designated by the same letter of the alphabet of all
                Series in the Group to which the Series established hereby
                belongs (after giving effect to provisions in the applicable
                Series Supplements substantially similar to the clauses
                preceding this clause (24)) and

            (2) the amount on deposit in the Group Finance Charge Collections
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

       (2)  Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

       (B)  If there is a Subordinate Class with respect to Class A, an amount
            equal to the lesser of

       (x)  the amount by which the Available Class B Credit Enhancement Amount
            is less than the Maximum Class B Credit Enhancement Amount and

       (y)  the product of


                                       3




<PAGE>   5




               (1)  a fraction, the numerator of which is the amount by which
                    the Available Class B Credit Enhancement Amount is less than
                    the Maximum Class B Credit Enhancement Amount and the
                    denominator of which is the sum of, for each Series in the
                    Group of which the Series established hereby is a member,
                    the amount by which the Available Class B Credit Enhancement
                    Amount for such Series is less than the Maximum Class B
                    Credit Enhancement Amount for such Series (after giving
                    effect to provisions in the applicable Series Supplements
                    substantially similar to the clauses preceding this clause
                    (25)) and

               (2)  the amount on deposit in the Group Finance Charge
                    Collections Reallocation Account before any withdrawals
                    therefrom with respect to any other Series pursuant to a
                    comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and paid to the Trustee as administrator of the Credit Enhancement for
application in accordance with the provisions of the Credit Enhancement
Agreement.  Each of the Available Class B Credit Enhancement Amount and the
Available Subordinated Amount shall be increased by the amount of such deposit.

            (c) Effective as of the date hereof, Section 10 ("Payments") of the
Agreement is amended as follows:

            (1) Subsection (a)(6) shall be renumbered as subsection (a)(7).

            (2) A new subsection (a)(6) shall be added as follows:

                 (6) On the first Special Payment Date of the Amortization
            Period, if any, after giving effect to the payments and withdrawals
            described above on such day, an amount equal to the lesser of

                       (x) the Series Invested Amount and

                       (y) the amount on deposit in the Series Principal Funding
                           Account

            shall be withdrawn from the Series Principal Funding Account and
            shall be paid to the Investor Certificateholders pursuant to Section
            5.01 of the Pooling and Servicing Agreement.  Except as set forth in
            the following sentence, all such amounts shall be paid to the Class
            A Investor Certificateholders until the Class A Invested Amount is
            reduced to zero; and, thereafter, if there is a Subordinate Class
            with respect to Class A, such amounts shall be paid to the Class B
            Investor Certificateholders until the Class B Invested Amount is
            reduced to zero, unless the

                                       4




<PAGE>   6




            Series Termination Date occurs prior to such date.  In no event
            shall any amounts be paid with respect to any Class of Investor
            Certificates pursuant to this clause (6) in excess of the Class
            Invested Amount for such Class.  Any amounts remaining on deposit in
            the Series Principal Funding Account after the Class Invested Amount
            for each Class has been reduced to zero shall be paid to the Holder
            of the Seller Certificate.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument. 



                                       5
<PAGE>   7


      IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                              GREENWOOD TRUST COMPANY, 
                                as Master Servicer, Servicer and Seller



                              By:    /s/ John J. Coane 
                                     -----------------
                              
                              Name:  John J. Coane
                                     -----------------
                              Title: Vice President, Director of Accounting, 
                                     Treasurer and Assistant Secretary
                                     ---------------------------------


     
                              U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                              By:     /s/ Patricia M. Trlak
                                      ---------------------
                              Name:   Patricia M. Trlak
                                      -----------------
                              Title:  Vice President
                                      --------------



                                      6


<PAGE>   1


                                                                    Exhibit 4.13

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                           Dated as of July 24, 1996

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                           DM 1,250,000,000 - Class A
                             $43,116,000 - Class B

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1996-5 CERTIFICATES


                                  Dated as of
                                 May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1996-5 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1996-5
SUPPLEMENT (the "Agreement"), executed and delivered as of July 24, 1996 with
respect to the Series 1996-5 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing
Agreement"), dated as of October 1, 1993, as amended, relating to Discover Card
Master Trust I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     
     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

         (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

         (a) (i)  with respect to the first Distribution Date, the Initial
     Subordinated Amount or (ii) with respect to any other Distribution Date,
     the Available Subordinated Amount after giving effect to all adjustments on
     the prior Distribution Date; and

         (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

         (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

         (1) Clause (24) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

      (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

      (A) An amount equal to the lesser of

         (x) the Class Required Amount Shortfall and

         (y) the product of

            (1)  a fraction the numerator of which is the Class Required Amount
                 Shortfall and the denominator of which is the sum of the Class
                 Required Amount Shortfalls for all Classes designated by the
                 same letter of the alphabet of all Series in the Group to which
                 the Series established hereby belongs (after giving effect to
                 provisions in the applicable Series Supplements substantially
                 similar to the clauses preceding this clause (24)) and

            (2)  the amount on deposit in the Group Finance Charge Collections
                 Reallocation Account before any withdrawals therefrom with
                 respect to any other Series pursuant to a comparable clause in
                 the applicable Series Supplements,

                                       2




<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

      (B) An amount equal to the lesser of

         (x) the Class Cumulative Investor Charged-Off Amount and

         (y) the product of

            (1) a fraction the numerator of which is the Class Cumulative
                Investor Charged-Off Amount and the denominator of  which is the
                sum of the Class Cumulative Investor Charged-Off Amounts for all
                Classes designated by the same letter of the alphabet of all
                Series in the Group to which the Series established hereby
                belongs (after giving effect to provisions in the applicable
                Series Supplements substantially similar to the clauses
                preceding this clause (24)) and

            (2) the amount on deposit in the Group Finance Charge Collections
                Reallocation Account before any withdrawals therefrom with
                respect to any other Series pursuant to a comparable clause in
                the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

                  (2)  Clause (25)(B) of Section 9(b) shall be amended by
deleting such clause in its entirety and replacing it with the following:

                  (B)  If there is a Subordinate Class with respect to Class A,
                       an amount equal to the lesser of

                  (x)  the amount by which the Available Class B Credit
                       Enhancement Amount is less than the Maximum Class B
                       Credit Enhancement Amount and

                  (y)  the product of


                                       3




<PAGE>   5




               (1)  a fraction, the numerator of which is the amount by which
                    the Available Class B Credit Enhancement Amount is less than
                    the Maximum Class B Credit Enhancement Amount and the
                    denominator of which is the sum of, for each Series in the
                    Group of which the Series established hereby is a member,
                    the amount by which the Available Class B Credit Enhancement
                    Amount for such Series is less than the Maximum Class B
                    Credit Enhancement Amount for such Series (after giving
                    effect to provisions in the applicable Series Supplements
                    substantially similar to the clauses preceding this clause
                    (25)) and

               (2)  the amount on deposit in the Group Finance Charge
                    Collections Reallocation Account before any withdrawals
                    therefrom with respect to any other Series pursuant to a
                    comparable clause in the applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of the
            Credit Enhancement for application in accordance with the provisions
            of the Credit Enhancement Agreement.  Each of the Available Class B
            Credit Enhancement Amount and the Available Subordinated Amount
            shall be increased by the amount of such deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.

                                      4
<PAGE>   6
     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                             GREENWOOD TRUST COMPANY,
                               as Master Servicer, Servicer and Seller

                             By:    /s/ John J. Coane
                                    -----------------
                             Name:  John J. Coane
                                    -----------------
                             Title: Vice President, Director of Accounting,
                                    Treasurer and Assistant Secretary
                                    ---------------------------------
                                              
                             U.S. BANK NATIONAL ASSOCIATION,
                               as Trustee


                             By:    /s/ Patricia M. Trlak
                                    ---------------------
                             Name:  Patricia M. Trlak
                                    -----------------
                             Title: Vice President
                                    --------------




                                      5


<PAGE>   1



                         
                                                                    Exhibit 4.14
                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of August 26, 1997

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $789,474,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1997-1 CERTIFICATES


                                  Dated as of

                                 May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1997-1 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1997-1
SUPPLEMENT (the "Agreement"), executed and delivered as of August 26, 1997 with
respect to the Series 1997-1 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

            (a) Effective as of the date hereof, Section 1 ("Definitions") of
the Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
       Subordinated Amount or (ii) with respect to any other Distribution Date,
       the Available Subordinated Amount after giving effect to all adjustments
       on the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance    
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

               (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

               (1) Clause (24) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

      (24) The allocations set forth in clauses (24)(A) and (24)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (24)(A) and
(24)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (24):

      (A) An amount equal to the lesser of

         (x) the Class Required Amount Shortfall and

         (y) the product of

               (1)  a fraction the numerator of which is the Class Required
                    Amount Shortfall and the denominator of which is the sum of
                    the Class Required Amount Shortfalls for all Classes
                    designated by the same letter of the alphabet of all Series
                    in the Group to which the Series established hereby belongs
                    (after giving effect to provisions in the applicable Series
                    Supplements substantially similar to the clauses preceding
                    this clause (24)) and

               (2)  the amount on deposit in the Group Finance Charge 
                    Collections Reallocation Account before any withdrawals 
                    therefrom with respect to any other Series pursuant to a
                    comparable clause in the applicable Series Supplements,

                                       2




<PAGE>   4





shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

         (B) An amount equal to the lesser of

            (x) the Class Cumulative Investor Charged-Off Amount and

            (y) the product of

               (1) a fraction the numerator of which is the Class Cumulative
                   Investor Charged-Off Amount and the denominator of  which is
                   the sum of the Class Cumulative Investor Charged-Off Amounts
                   for all Classes designated by the same letter of the alphabet
                   of all Series in the Group to which the Series established
                   hereby belongs (after giving effect to provisions in the
                   applicable Series Supplements substantially similar to the
                   clauses preceding this clause (24)) and

               (2) the amount on deposit in the Group Finance Charge Collections
                   Reallocation Account before any withdrawals therefrom with
                   respect to any other Series pursuant to a comparable clause
                   in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

            (2) Clause (25)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

            (B) If there is a Subordinate Class with respect to Class A, an
                amount equal to the lesser of

            (x)  the amount by which the Available Class B Credit Enhancement
                 Amount is less than the Maximum Class B Credit Enhancement
                 Amount and

            (y)  the product of


                                       3




<PAGE>   5




                        (1)  a fraction, the numerator of which is the amount by
                             which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than the
                             Maximum Class B Credit Enhancement Amount for such
                             Series (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (25)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

               shall be withdrawn from the Group Finance Charge Collections
               Reallocation Account and paid to the Trustee as administrator of
               the Credit Enhancement for application in accordance with the
               provisions of the Credit Enhancement Agreement.  Each of the
               Available Class B Credit Enhancement Amount and the Available
               Subordinated Amount shall be increased by the amount of such
               deposit.

               3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

               4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      4
<PAGE>   6
 IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment to be
duly executed by their respective officers as of the day and year first above
written.

                              GREENWOOD TRUST COMPANY,
                                as Master Servicer, Servicer and Seller



                              By:    /s/ John J. Coane
                                     ---------------------
                              Name:  John J. Coane
                                     ---------------------
                              Title: Vice President, Director of Accounting,
                                    Treasurer and Assistant Secretary



                              U.S. BANK NATIONAL ASSOCIATION,
                               as Trustee


                              By:    /s/ Patricia M. Trlak
                                     ---------------------
                              Name:  Patricia M. Trlak
                                     ---------------------
                              Title: Vice President
                                     ---------------------




                                      5


<PAGE>   1


                                                                    Exhibit 4.15

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of October 15, 1997

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $526,316,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1997-2 CERTIFICATES



                                  Dated as of
                                  May 15, 1998


<PAGE>   2
     THIS FIRST AMENDMENT TO THE SERIES 1997-2 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1997-2
SUPPLEMENT (the "Agreement"), executed and delivered as of October 15, 1997 with
respect to the Series 1997-2 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

            (a) Effective as of the date hereof, Section 1 ("Definitions") of
the Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
     Subordinated Amount or (ii) with respect to any other Distribution Date,
     the Available Subordinated Amount after giving effect to all adjustments on
     the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such
<PAGE>   3
Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount,
in each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

         (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

         (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

     (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

     (A) An amount equal to the lesser of

         (x) the Class Required Amount Shortfall and

         (y) the product of

               (1) a fraction the numerator of which is the Class Required
                   Amount Shortfall and the denominator of which is the sum of
                   the Class Required Amount Shortfalls for all Classes
                   designated by the same letter of the alphabet of all Series
                   in the Group to which the Series established hereby belongs
                   (after giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge


                                      2
<PAGE>   4
                         Collections Reallocation Account before any withdrawals
                         therefrom with respect to any other Series pursuant to
                         a comparable clause in the applicable Series
                         Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

         (B) An amount equal to the lesser of

            (x) the Class Cumulative Investor Charged-Off Amount and

            (y) the product of

               (1) a fraction the numerator of which is the Class Cumulative
                   Investor Charged-Off Amount and the denominator of  which is
                   the sum of the Class Cumulative Investor Charged-Off Amounts
                   for all Classes designated by the same letter of the alphabet
                   of all Series in the Group to which the Series established
                   hereby belongs (after giving effect to provisions in the
                   applicable Series Supplements substantially similar to the
                   clauses preceding this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge Collections
                   Reallocation Account before any withdrawals therefrom with
                   respect to any other Series pursuant to a comparable clause
                   in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

         (2) Clause (26)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (B) If there is a Subordinate Class with respect to Class A, an amount
             equal to the lesser of

                  (x)  the amount by which the Available Class B Credit
                       Enhancement Amount is less than the Maximum Class B
                       Credit Enhancement Amount and



                                      3
<PAGE>   5
                  (y)  the product of

                        (1)  a fraction, the numerator of which is the amount by
                             which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than the
                             Maximum Class B Credit Enhancement Amount for such
                             Series (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (26)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of
            the Credit Enhancement for application in accordance with the
            provisions of the Credit Enhancement Agreement.  Each of the
            Available Class B Credit Enhancement Amount and the Available
            Subordinated Amount shall be increased by the amount of such
            deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      4
<PAGE>   6

     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                             GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller



                             By:    /s/ John J. Coane
                                    -----------------
                             Name:  John J. Coane
                                    -----------------
                             Title: Vice President, Director of Accounting,
                                    ---------------------------------------
                                    Treasurer and Assistant Secretary
                                    ---------------------------------------


                             U.S. BANK NATIONAL ASSOCIATION,
                             as Trustee


                             By:     /s/ Patricia M. Trlak
                                     ----------------------
                             Name:   Patricia M. Trlak
                                     ----------------------
                             Title:  Vice President
                                     ----------------------




                                      5


<PAGE>   1


                                                                   Exhibit 4.16

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of October 23, 1997

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $684,211,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1997-3 CERTIFICATES


                                  Dated as of
                                 May 15, 1998

               



<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1997-3 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1997-3
SUPPLEMENT (the "Agreement"), executed and delivered as of October 23, 1997 with
respect to the Series 1997-3 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

         (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

         (A) An amount equal to the lesser of

            (x) the Class Required Amount Shortfall and

            (y) the product of

               (1) a fraction the numerator of which is the Class Required
                   Amount Shortfall and the denominator of which is the sum of
                   the Class Required Amount Shortfalls for all Classes
                   designated by the same letter of the alphabet of all Series
                   in the Group to which the Series established hereby belongs
                   (after giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge

                                       2




<PAGE>   4

                              Collections Reallocation Account before any
                              withdrawals therefrom with respect to any other
                              Series pursuant to a comparable clause in the
                              applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

         (B) An amount equal to the lesser of

            (x) the Class Cumulative Investor Charged-Off Amount and

            (y) the product of

               (1) a fraction the numerator of which is the Class Cumulative
                   Investor Charged-Off Amount and the denominator of  which is
                   the sum of the Class Cumulative Investor Charged-Off Amounts
                   for all Classes designated by the same letter of the alphabet
                   of all Series in the Group to which the Series established
                   hereby belongs (after giving effect to provisions in the
                   applicable Series Supplements substantially similar to the
                   clauses preceding this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge Collections
                   Reallocation Account before any withdrawals therefrom with
                   respect to any other Series pursuant to a comparable clause
                   in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

         (2) Clause (26)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (B) If there is a Subordinate Class with respect to Class A, an amount
             equal to the lesser of

         (x) the amount by which the Available Class B Credit Enhancement 
             Amount is less than the Maximum Class B Credit Enhancement Amount 
             and


                                       3




<PAGE>   5




                  (y)  the product of

                        (1)  a fraction, the numerator of which is the amount   
                             by which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than
                             the Maximum Class B Credit Enhancement Amount for
                             such Series (after giving effect to provisions in
                             the applicable Series Supplements substantially
                             similar to the clauses preceding this clause (26))
                             and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of
            the Credit Enhancement for application in accordance with the
            provisions of the Credit Enhancement Agreement.  Each of the
            Available Class B Credit Enhancement Amount and the Available
            Subordinated Amount shall be increased by the amount of such
            deposit.

             3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

             4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      4
<PAGE>   6
     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment to
be duly executed by their respective officers as of the day and year first above
written.

     
     
                             GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller



                             By:    /s/ John J. Coane
                                   -----------------
                             Name:  John J. Coane
                                   -----------------
                             Title: Vice President, Director of Accounting,
                                    ---------------------------------------
                                    Treasurer and Assistant Secretary
                                    ---------------------------------------


                             U.S. BANK NATIONAL ASSOCIATION,
                             as Trustee


                             By:      /s/ Patricia M. Trlak
                                      ---------------------------
                             Name:    Patricia M. Trlak
                                      ---------------------------
                             Title:   Vice President
                                      ---------------------------


                                      5


<PAGE>   1


                                                                    Exhibit 4.17

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of October 31, 1997

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $789,474,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1997-4 CERTIFICATES


                                  Dated as of
                                 May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1997-4 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1997-4
SUPPLEMENT (the "Agreement"), executed and delivered as of October 31, 1997 with
respect to the Series 1997-4 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual
agreements herein contained, each party agrees as follows for the benefit of
the other parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in
this Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

         (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

           (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

               (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

               (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

         (A) An amount equal to the lesser of

            (x) the Class Required Amount Shortfall and

            (y) the product of

                  (1) a fraction the numerator of which is the Class Required
                      Amount Shortfall and the denominator of which is the sum
                      of the Class Required Amount Shortfalls for all Classes
                      designated by the same letter of the alphabet of all
                      Series in the Group to which the Series established hereby
                      belongs (after giving effect to provisions in the
                      applicable Series Supplements substantially similar to the
                      clauses preceding this clause (25)) and

                  (2) the amount on deposit in the Group Finance Charge

                                       2




<PAGE>   4




                              Collections Reallocation Account before any
                              withdrawals therefrom with respect to any other
                              Series pursuant to a comparable clause in the
                              applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

     (B) An amount equal to the lesser of

         (x) the Class Cumulative Investor Charged-Off Amount and

         (y) the product of

                           (1) a fraction the numerator of which is the Class
                               Cumulative Investor Charged-Off Amount and the
                               denominator of which is the sum of the Class
                               Cumulative Investor Charged-Off Amounts for all
                               Classes designated by the same letter of the
                               alphabet of all Series in the Group to which the
                               Series established hereby belongs (after giving
                               effect to provisions in the applicable Series
                               Supplements substantially similar to the clauses
                               preceding this clause (25)) and

                           (2) the amount on deposit in the Group Finance Charge
                               Collections Reallocation Account before any
                               withdrawals therefrom with respect to any other
                               Series pursuant to a comparable clause in the
                               applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

              (2) Clause (26)(B) of Section 9(b) shall be amended by deleting
such clause in its entirety and replacing it with the following:

              (B) If there is a Subordinate Class with respect to Class A, an
                   amount equal to the lesser of

              (x)  the amount by which the Available Class B Credit Enhancement
                   Amount is less than the Maximum Class B Credit Enhancement
                   Amount and


                                       3




<PAGE>   5




                  (y)  the product of

                        (1)  a fraction, the numerator of which is the amount by
                             which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than the
                             Maximum Class B Credit Enhancement Amount for such
                             Series (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (26)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of
            the Credit Enhancement for application in accordance with the
            provisions of the Credit Enhancement Agreement.  Each of the
            Available Class B Credit Enhancement Amount and the Available
            Subordinated Amount shall be increased by the amount of such
            deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      4
<PAGE>   6

     IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment
to be duly executed by their respective officers as of the day and year first
above written.

                             GREENWOOD TRUST COMPANY,
                               as Master Servicer, Servicer and Seller



                             By:    /s/ John J. Coane
                                    -----------------
                             Name:  John J. Coane
                                    -----------------
                             Title: Vice President, Director of Accounting,
                                    ---------------------------------------
                                    Treasurer and Assistant Secretary
                                    ---------------------------------------


                             U.S. BANK NATIONAL ASSOCIATION,
                               as Trustee


                             By:    /s/ Patricia M. Trlak
                                    -----------------------  
                             Name:  Patricia M. Trlak
                                    -----------------------
                             Title: Vice President
                                    -----------------------




                                       5

<PAGE>   1


                                                                   Exhibit 4.18

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                          Dated as of January 14, 1998

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $368,422,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1998-1 CERTIFICATES


                                  Dated as of
                                 May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1998-1 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1998-1
SUPPLEMENT (the "Agreement"), executed and delivered as of January 14, 1998 with
respect to the Series 1998-1 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

     (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

           (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

           (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

         (A) An amount equal to the lesser of

            (x) the Class Required Amount Shortfall and

            (y) the product of

               (1) a fraction the numerator of which is the Class Required
                   Amount Shortfall and the denominator of which is the sum of
                   the Class Required Amount Shortfalls for all Classes
                   designated by the same letter of the alphabet of all Series
                   in the Group to which the Series established hereby belongs
                   (after giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge

                                       2




<PAGE>   4




                               Collections Reallocation Account before any
                               withdrawals therefrom with respect to any other
                               Series pursuant to a comparable clause in the
                               applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

               (B) An amount equal to the lesser of

                    (x) the Class Cumulative Investor Charged-Off Amount and

                    (y) the product of

                           (1) a fraction the numerator of which is the Class
                               Cumulative Investor Charged-Off Amount and the
                               denominator of  which is the sum of the Class
                               Cumulative Investor Charged-Off Amounts for all
                               Classes designated by the same letter of the
                               alphabet of all Series in the Group to which the
                               Series established hereby belongs (after giving
                               effect to provisions in the applicable Series
                               Supplements substantially similar to the clauses
                               preceding this clause (25)) and

                           (2) the amount on deposit in the Group Finance Charge
                               Collections Reallocation Account before any
                               withdrawals therefrom with respect to any other
                               Series pursuant to a comparable clause in the
                               applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

               (2) Clause (26)(B) of Section 9(b) shall be amended by deleting
such clause in its entirety and replacing it with the following:

               (B) If there is a Subordinate Class with respect to Class A, an
                   amount equal to the lesser of

                    (x)  the amount by which the Available Class B Credit
                         Enhancement Amount is less than the Maximum Class B
                         Credit Enhancement Amount and


                                       3




<PAGE>   5




                  (y)  the product of

                        (1)  a fraction, the numerator of which is the amount by
                             which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than the
                             Maximum Class B Credit Enhancement Amount for such
                             Series (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (26)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of the
            Credit Enhancement for application in accordance with the provisions
            of the Credit Enhancement Agreement.  Each of the Available Class B
            Credit Enhancement Amount and the Available Subordinated Amount
            shall be increased by the amount of such deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      4
<PAGE>   6
    IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment to
be duly executed by their respective officers as of the day and year first above
written.

                             GREENWOOD TRUST COMPANY,
                              as Master Servicer, Servicer and Seller





                             By:    /s/ John J. Coane
                                    -----------------
                             Name:  John J. Coane
                                    -----------------
                             Title: Vice President, Director of Accounting,
                                    ---------------------------------------
                                    Treasurer and Assistant Secretary
                                    ---------------------------------------


                             U.S. BANK NATIONAL ASSOCIATION,
                               as Trustee


                             By:    /s/ Patricia M. Trlak
                                    -------------------------
                             Name:  Patricia M. Trlak
                                    -------------------------
                             Title: Vice President
                                    -------------------------



                                      5



<PAGE>   1


                                                                    Exhibit 4.19

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                           Dated as of March 4, 1998

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $526,316,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1998-2 CERTIFICATES


                                  Dated as of
                                  May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1998-2 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1998-2
SUPPLEMENT (the "Agreement"), executed and delivered as of March 4, 1998 with
respect to the Series 1998-2 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

         (a) Effective as of the date hereof, Section 1 ("Definitions") of the
Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
      Subordinated Amount or (ii) with respect to any other Distribution Date,
      the Available Subordinated Amount after giving effect to all adjustments
      on the prior Distribution Date; and

            (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

         (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

         (A) An amount equal to the lesser of

            (x) the Class Required Amount Shortfall and

            (y) the product of

                    (1) a fraction the numerator of which is the Class Required
                        Amount Shortfall and the denominator of which is the sum
                        of the Class Required Amount Shortfalls for all Classes
                        designated by the same letter of the alphabet of all
                        Series in the Group to which the Series established
                        hereby belongs (after giving effect to provisions in the
                        applicable Series Supplements substantially similar to
                        the clauses preceding this clause (25)) and

                    (2) the amount on deposit in the Group Finance Charge

                                       2




<PAGE>   4




                        Collections Reallocation Account before any withdrawals
                        therefrom with respect to any other Series pursuant to a
                        comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

            (B) An amount equal to the lesser of

               (x) the Class Cumulative Investor Charged-Off Amount and

               (y) the product of

                    (1) a fraction the numerator of which is the Class
                        Cumulative Investor Charged-Off Amount and the
                        denominator of which is the sum of the Class Cumulative
                        Investor Charged-Off Amounts for all Classes designated
                        by the same letter of the alphabet of all Series in the
                        Group to which the Series established hereby belongs
                        (after giving effect to provisions in the applicable
                        Series Supplements substantially similar to the clauses
                        preceding this clause (25)) and

                    (2) the amount on deposit in the Group Finance Charge
                        Collections Reallocation Account before any withdrawals
                        therefrom with respect to any other Series pursuant to a
                        comparable clause in the applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

            (2) Clause (26)(B) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

            (B) If there is a Subordinate Class with respect to Class A, an
                amount equal to the lesser of

            (x)  the amount by which the Available Class B Credit Enhancement
                 Amount is less than the Maximum Class B Credit Enhancement
                 Amount and


                                       3




<PAGE>   5




                  (y)  the product of

                       (1)   a fraction, the numerator of which is the amount   
                             by which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than
                             the Maximum Class B Credit Enhancement Amount for
                             such Series (after giving effect to provisions in
                             the applicable Series Supplements substantially
                             similar to the clauses preceding this clause (26))
                             and
                           
                       (2)   the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of
            the Credit Enhancement for application in accordance with the
            provisions of the Credit Enhancement Agreement.  Each of the
            Available Class B Credit Enhancement Amount and the Available
            Subordinated Amount shall be increased by the amount of such
            deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.


                                      4
<PAGE>   6
 IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment to be
duly executed by their respective officers as of the day and year first above
written.

                             GREENWOOD TRUST COMPANY,
                               as Master Servicer, Servicer and Seller



                             By:    /s/ John J. Coane
                                    -----------------
                             Name:  John J. Coane
                                    -----------------
                             Title: Vice President, Director of Accounting,
                                    ----------------------------------------
                                    Treasurer and Assistant Secretary
                                    ----------------------------------------


                             U.S. BANK NATIONAL ASSOCIATION,
                              as Trustee


                             By:    /s/ Patricia M. Trlak
                                    ---------------------------
                             Name:  Patricia M. Trlak
                                    ---------------------------
                             Title: Vice President
                                    ---------------------------



                                      5


<PAGE>   1


                                                                   Exhibit 4.20

                            GREENWOOD TRUST COMPANY

                      Master Servicer, Servicer and Seller

                                      and

                         U.S. BANK NATIONAL ASSOCIATION

                                    Trustee

                      on behalf of the Certificateholders




                      FIRST AMENDMENT TO SERIES SUPPLEMENT

                           Dated as of March 25, 1998

                                       to

                        POOLING AND SERVICING AGREEMENT

                          Dated as of October 1, 1993



                                  $789,474,000

                          DISCOVER CARD MASTER TRUST I
                           SERIES 1998-3 CERTIFICATES


                                  Dated as of
                                  May 15, 1998





<PAGE>   2




     THIS FIRST AMENDMENT TO THE SERIES 1998-3 SUPPLEMENT (the "Amendment"),
dated as of May 15, 1998, is entered into by and between GREENWOOD TRUST
COMPANY, a Delaware banking corporation, as Master Servicer, Servicer and Seller
("Greenwood") and U.S. BANK NATIONAL ASSOCIATION (formerly First Bank National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, National Association), as Trustee (the "Trustee").

     WHEREAS Greenwood and the Trustee have entered into the SERIES 1998-3
SUPPLEMENT (the "Agreement"), executed and delivered as of March 25, 1998 with
respect to the Series 1998-3 Certificates, pursuant to Section 6.06 of that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of October 1, 1993, as amended, relating to Discover Card Master Trust
I; and

     WHEREAS pursuant to subsections 13.01(a)(ii) and (iv) of the Pooling and
Servicing Agreement, Greenwood and the Trustee desire to amend Sections 1 and 9
of the Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
herein contained, each party agrees as follows for the benefit of the other
parties and for the benefit of the Certificateholders:

     1. Definitions.  Unless otherwise specified, capitalized terms used in this
Amendment shall have the same meanings ascribed to them in the Agreement.

     2. Amendment to the Agreement.

            (a) Effective as of the date hereof, Section 1 ("Definitions") of
the Agreement is amended by deleting the definition of  "Available Subordinated
Amount" in its entirety and replacing it with the following:

     "Available Subordinated Amount," if there is a Subordinate Class with
respect to Class A, shall mean, on a Distribution Date, the sum of

            (a) (i)  with respect to the first Distribution Date, the Initial
         Subordinated Amount or (ii) with respect to any other Distribution
         Date, the Available Subordinated Amount after giving effect to all
         adjustments on the prior Distribution Date; and

           (b) the amount of Series Excess Servicing;

as such amount may be (x) reduced pursuant to the provisions of Section 9 to
take into account (i) the amount of Class A and Class B Excess Servicing used to
reimburse the Class A Cumulative Investor Charged-Off Amount, (ii) the amount of
Class B Excess Servicing used to reduce the Class A Required Amount Shortfall,
(iii) the amount of the Class B Subordinated Payment and (iv) the amount of any
reduction in the Class B Investor Interest resulting from the reimbursement of
the Class A Cumulative Investor Charged-Off Amount, in each case for such





<PAGE>   3




Distribution Date, and (y) increased pursuant to the provisions of Section 9 to
take into account the application of amounts on deposit in the Group Finance
Charge Collections Reallocation Account (i) to reduce the Class B Required
Amount Shortfall, (ii) to reduce the Class B Cumulative Investor Charged-Off
Amount and (iii) to increase the Available Class B Credit Enhancement Amount, in
each case for such Distribution Date;  provided, however, that from and after
the Fully Funded Date, if any, the Available Subordinated Amount will equal
zero.

Upon the occurrence of a Supplemental Credit Enhancement Event, the Available
Subordinated Amount will be increased by the Supplemental Subordinated Amount.
In addition, on the first Distribution Date following an Effective Alternative
Credit Support Election, the Available Subordinated Amount shall be increased by
the Additional Subordinated Amount.  In no event, however, shall the Available
Subordinated Amount exceed (i) through the last Distribution Date preceding an
Effective Alternative Credit Support Election, the Initial Subordinated Amount
plus the Supplemental Subordinated Amount and (ii) thereafter, the sum of the
Initial Subordinated Amount, the Supplemental Subordinated Amount and the
Additional Subordinated Amount.

            (b) Effective as of the date hereof, Section 9 ("Allocations of
Collections") of the Agreement is amended as follows:

            (1) Clause (25) of Section 9(b) shall be amended by deleting such
clause in its entirety and replacing it with the following:

     (25) The allocations set forth in clauses (25)(A) and (25)(B) shall be
made, first, with respect to Class A, and then, if there is a Subordinate Class
with respect to Class A, the allocations set forth in clauses (25)(A) and
(25)(B) shall be made with respect to Class B, to the extent that funds are
available pursuant to this clause (25):

     (A) An amount equal to the lesser of

         (x) the Class Required Amount Shortfall and

         (y) the product of

               (1) a fraction the numerator of which is the Class Required
                   Amount Shortfall and the denominator of which is the sum of
                   the Class Required Amount Shortfalls for all Classes
                   designated by the same letter of the alphabet of all Series
                   in the Group to which the Series established hereby belongs
                   (after giving effect to provisions in the applicable Series
                   Supplements substantially similar to the clauses preceding
                   this clause (25)) and

               (2) the amount on deposit in the Group Finance Charge

                                       2




<PAGE>   4




                              Collections Reallocation Account before any
                              withdrawals therefrom with respect to any other
                              Series pursuant to a comparable clause in the
                              applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Distribution Account.  The Class Required
Amount Shortfall shall be reduced by the amount of such deposit.  The Available
Subordinated Amount shall be increased by the amount of any such deposit that
reduces the Class B Required Amount Shortfall.

               (B) An amount equal to the lesser of

                   (x) the Class Cumulative Investor Charged-Off Amount and

                   (y) the product of

                         (1) a fraction the numerator of which is the Class
                             Cumulative Investor Charged-Off Amount and the
                             denominator of  which is the sum of the Class
                             Cumulative Investor Charged-Off Amounts for all
                             Classes designated by the same letter of the
                             alphabet of all Series in the Group to which the
                             Series established hereby belongs (after giving
                             effect to provisions in the applicable Series
                             Supplements substantially similar to the clauses
                             preceding this clause (25)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

shall be withdrawn from the Group Finance Charge Collections Reallocation
Account and deposited into the Series Principal Collections Account.  The Class
Cumulative Investor Charged-Off Amount shall be reduced by the amount of such
deposit.  The Available Subordinated Amount shall be increased by the amount of
any such deposit that reduces the Class B Cumulative Investor Charged-Off
Amount.

                   (2) Clause (26)(B) of Section 9(b) shall be amended by
deleting such clause in its entirety and replacing it with the following:

     (B) If there is a Subordinate Class with respect to Class A, an amount
equal to the lesser of

                    (x)  the amount by which the Available Class B Credit
                         Enhancement Amount is less than the Maximum Class B
                         Credit Enhancement Amount and


                                       3




<PAGE>   5




                  (y)  the product of

                        (1)  a fraction, the numerator of which is the amount by
                             which the Available Class B Credit Enhancement
                             Amount is less than the Maximum Class B Credit
                             Enhancement Amount and the denominator of which is
                             the sum of, for each Series in the Group of which
                             the Series established hereby is a member, the
                             amount by which the Available Class B Credit
                             Enhancement Amount for such Series is less than the
                             Maximum Class B Credit Enhancement Amount for such
                             Series (after giving effect to provisions in the
                             applicable Series Supplements substantially similar
                             to the clauses preceding this clause (26)) and

                        (2)  the amount on deposit in the Group Finance Charge
                             Collections Reallocation Account before any
                             withdrawals therefrom with respect to any other
                             Series pursuant to a comparable clause in the
                             applicable Series Supplements,

            shall be withdrawn from the Group Finance Charge Collections
            Reallocation Account and paid to the Trustee as administrator of the
            Credit Enhancement for application in accordance with the provisions
            of the Credit Enhancement Agreement.  Each of the Available Class B
            Credit Enhancement Amount and the Available Subordinated Amount
            shall be increased by the amount of such deposit.

            3. Effect Upon the Agreement.  Except as specifically set forth
herein, the Agreement shall remain in full force and effect and is hereby
ratified and confirmed.

            4. Counterparts.  This Amendment may be executed in two or more
counterparts (and by different parties on separate counterparts), each of which
shall be an original, but all of which together shall constitute one and the
same instrument.



                                      4
<PAGE>   6
 IN WITNESS WHEREOF, Greenwood and the Trustee have caused this Amendment to be
duly executed by their respective officers as of the day and year first above
written.

                              GREENWOOD TRUST COMPANY,
                               as Master Servicer, Servicer and Seller



                              By:    /s/ John J. Coane
                                      -----------------
                              Name:  John J. Coane
                                      -----------------

                              Title: Vice President, Director of Accounting,
                                     -----------------------------------------
                                     Treasurer and Assistant Secretary
                                     -----------------------------------------


                              U.S. BANK NATIONAL ASSOCIATION,
                                as Trustee


                              By:    /s/ Patricia M. Trlak
                                     -----------------------------
                              Name:  Patricia M. Trlak
                                     -----------------------------
                              Title: Vice President
                                     -----------------------------






                                      5



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