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


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                                AMENDMENT NO. 1*

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                    893416107
                                 (CUSIP Number)

                                  JUNE 30, 2000
             (Date of Event Which Requires Filing of this Statement)


CHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE
IS FILED:

                                [X] RULE 13d-1(b)
                                [ ] RULE 13d-1(c)
                                [ ] RULE 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).





CUSIP No. 893416107                 13G

1.       NAME OF REPORTING PERSON (S.S. or I.R.S. Identification No. of Above
         Person)

         Waddell & Reed Investment Management Company  Tax ID No. 48-1106973

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:

         (a)      [ ]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION:  Kansas

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

         5.       SOLE VOTING POWER                  3,973,600  (See Item 4)

         6.       SHARED VOTING POWER                0

         7.       SOLE DISPOSITIVE POWER             3,973,600  (See Item 4)

         8.       SHARED DISPOSITIVE POWER           0

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON: 3,973,600
         (See Item 4)

10.      CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES:     [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9:  12.0%

12.      TYPE OF PERSON REPORTING: IA







CUSIP No. 893416107                 13G

1.       NAME OF REPORTING PERSON (S.S. or I.R.S. Identification No. of Above
         Person)

         Waddell & Reed, Inc.  Tax ID No. 43-1235675

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:

         (a)      [ ]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION: Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

         5.       SOLE VOTING POWER                  3,973,600  (See Item 4)

         6.       SHARED VOTING POWER                0

         7.       SOLE DISPOSITIVE POWER             3,973,600  (See Item 4)

         8.       SHARED DISPOSITIVE POWER           0

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON: 3,973,600
         (See Item 4)

10.      CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES:     [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9:  12.0%

12.      TYPE OF PERSON REPORTING:  BD





CUSIP No. 893416107                 13G

1.       NAME OF REPORTING PERSON (S.S. or I.R.S. Identification No. of Above
         Person)

         Waddell & Reed Financial Services, Inc.  Tax ID No. 43-1414157

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:

         (a)      [ ]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION:  Missouri

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

         5.       SOLE VOTING POWER                  3,973,600  (See Item 4)

         6.       SHARED VOTING POWER                0

         7.       SOLE DISPOSITIVE POWER             3,973,600  (See Item 4)

         8.       SHARED DISPOSITIVE POWER           0

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON: 3,973,600
         (See Item 4)

10.      CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES:     [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9:  12.0%

12.      TYPE OF PERSON REPORTING: HC





CUSIP No. 893416107                 13G

1.       NAME OF REPORTING PERSON (S.S. or I.R.S. Identification No. of Above
         Person)

         Waddell & Reed Financial, Inc.  Tax ID No. 51-0261715

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:

         (a)      [ ]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION:  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

         5.       SOLE VOTING POWER                  3,973,600  (See Item 4)

         6.       SHARED VOTING POWER                0

         7.       SOLE DISPOSITIVE POWER             3,973,600  (See Item 4)

         8.       SHARED DISPOSITIVE POWER           0

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON: 3,973,600
         (See Item 4)

10.      CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES:     [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9:  12.0%

12.      TYPE OF PERSON REPORTING:  HC





ITEM 1(a):        NAME OF ISSUER:  Transaction Systems Architects, Inc.

ITEM 1(b):        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                  224 South 108th Avenue
                  Suite 7
                  Omaha, NE 68154

ITEM 2(a):        NAME OF PERSON FILING:

                  (i)      Waddell & Reed Financial, Inc.
                  (ii)     Waddell & Reed Financial Services, Inc.
                  (iii)    Waddell & Reed, Inc.
                  (iv)     Waddell & Reed Investment Management Company

ITEM 2(b):        ADDRESS OF PRINCIPAL BUSINESS OFFICE:

                  (i)-(iv):         6300 Lamar Avenue
                                    Overland Park, KS  66202

ITEM 2(c):        CITIZENSHIP:

                  (i), (iii): Delaware
                  (ii):  Missouri
                  (iv):  Kansas

ITEM 2(d):        TITLE OF CLASS OF SECURITIES:  Common Stock

ITEM 2(e):        CUSIP NUMBER:  893416107

ITEM 3:           The reporting person is:

                  (i)      Waddell & Reed Financial, Inc., a parent holding
                           company in accordance with Reg.
                           240.13d-1(b)(1)(ii)(G);
                  (ii)     Waddell & Reed Financial Services, Inc., a parent
                           holding company in accordance with Reg.
                           240.13d-1(b)(1)(ii)(G);
                  (iii)    Waddell & Reed, Inc., a broker-dealer in accordance
                           with Reg. 240.13d-1(b)(1)(ii)(A); and
                  (iv)     Waddell & Reed Investment Management Company, an
                           investment advisor in accordance with Reg.
                           240.13d-1(b)(1)(ii)(E).

ITEM 4:           OWNERSHIP

                  The securities reported on herein are beneficially owned by
one or more open-end investment companies or other managed accounts which are
advised or sub-advised by Waddell






& Reed Investment Management Company ("WRIMCO"), an investment advisory
subsidiary of Waddell & Reed, Inc. ("WRI"). WRI is a broker-dealer and
underwriting subsidiary of Waddell & Reed Financial Services, Inc., a parent
holding company ("WRFSI"). In turn, WRFSI is a subsidiary of Waddell & Reed
Financial, Inc., a publicly traded company ("WDR"). The investment advisory
contracts grant WRIMCO all investment and/or voting power over securities owned
by such advisory clients. The investment sub-advisory contracts grant WRIMCO
investment power over securities owned by such sub-advisory clients and, in most
cases, voting power. Any investment restriction of a sub-advisory contract does
not restrict investment discretion or power in a material manner. Therefore,
WRIMCO may be deemed the beneficial owner of the securities covered by this
statement under Rule 13d-3 of the Securities Exchange Act of 1934 (the "1934
Act").

         WRIMCO, WRI, WRFSI and WDR are of the view that they are not acting as
a "group" for purposes of Section 13(d) under the 1934 Act. Indirect "beneficial
ownership" is attributed to the respective parent companies solely because of
the parent companies' control relationship to WRIMCO.

                  (a)      Amount beneficially owned:  3,973,600

                  (b)      Percent of class:  12.0%

                  (c)      Number of shares as to which the person has:

                           (i)      Sole voting power to vote or to direct the
                                    vote:

                                    WDR:  3,973,600 (indirect)
                                    WRFSI:  3,973,600 (indirect)
                                    WRI:  3,973,600 (indirect)
                                    WRIMCO:  3,973,600 (direct)

                           (ii)     Shared power to vote or to direct the vote:
                                    0

                           (iii)    Sole power to dispose or to direct the
                                    disposition of:

                                    WDR:  3,973,600 (indirect)
                                    WRFSI:  3,973,600 (indirect)
                                    WRI:  3,973,600 (indirect)
                                    WRIMCO:  3,973,600 (direct)

                           (iv)     Shared power to dispose or to direct the
                                    disposition of:  0

ITEM 5:           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:




                  If this statement is being filed to report the fact that as of
the date hereof the reporting person has ceased to be the beneficial owner of
more than 5 percent of the class of securities, check the following: [ ]


ITEM 6:           OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                  PERSON:

                  The clients of WRIMCO, including investment companies
registered under the Investment Company Act of 1940 and other managed accounts,
have the right to receive dividends from as well as the proceeds from the sale
of such securities.

ITEM 7:           IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY:

                  See Attached Exhibit 2.

ITEM 8:           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                  Not Applicable.

ITEM 9:           NOTICE OF DISSOLUTION OF GROUP:

                  Not Applicable.




Item 10: Certification:

                  By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and are held in the
ordinary course of business and were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.

                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Dated:   July 6, 2000


Waddell & Reed Financial, Inc.      Waddell & Reed Financial Services, Inc.

By: /s/ Daniel C. Schulte           By: /s/ Wendy J. Hills

Name: Daniel C. Schulte             Name: Wendy J. Hills
Title:  Vice President              Title:  Attorney-In-Fact


Waddell & Reed, Inc.                Waddell & Reed Investment Management Company

By: /s/ Wendy J. Hills              By: /s/ Wendy J. Hills

Name: Wendy J. Hills                Name: Wendy J. Hills
Title: Attorney-In-Fact             Title: Attorney-In-Fact





                                  EXHIBIT INDEX

Exhibit
   No.            Description

    1             Joint Filing Agreement

    2             Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on by the Parent Holding
                  Company

    3             Power of Attorney





                                    EXHIBIT 1

                             JOINT FILING AGREEMENT

         Waddell & Reed Financial, Inc., Waddell & Reed Financial Services,
Inc., Waddell & Reed, Inc. and Waddell & Reed Investment Management Company (the
"Filing Persons"), hereby agree to file jointly a Schedule 13G and any
amendments thereto relating to the aggregate ownership by each of the Filing
Persons of any voting equity security of a class which is registered pursuant to
Section 12 of the Securities Exchange Act of 1934, as amended, as required by
Rule 13d-1 and Rule 13d-2 promulgated under the Securities Exchange Act of 1934.
Each of the Filing Persons agrees that the information set forth in such
Schedule 13G and any amendments thereto with respect to such Filing Person will
be true, complete and correct as of the date of such Schedule 13G or such
amendment, to the best of such Filing Person's knowledge and belief, after
reasonable inquiry. Each of the Filing Persons makes no representations as to
the accuracy or adequacy of the information set forth in the Schedule 13G or any
amendments thereto with respect to any other Filing Person. Each of the Filing
Persons shall promptly notify the other Filing Persons if any of the information
set forth in the Schedule 13G or any amendments thereto shall become inaccurate
in any material respect or if said person learns of information that would
require an amendment to the Schedule 13G.

         IN WITNESS WHEREOF, the undersigned have set their hands this 6th day
of July 2000.


Waddell & Reed Financial, Inc.      Waddell & Reed Financial Services, Inc.

By: /s/ Daniel C. Schulte           By: /s/ Wendy J. Hills

Name: Daniel C. Schulte             Name: Wendy J. Hills
Title:  Vice President              Title:  Attorney-In-Fact


Waddell & Reed, Inc.                Waddell & Reed Investment Management Company

By: /s/ Wendy J. Hills              By: /s/ Wendy J. Hills

Name: Wendy J. Hills                Name: Wendy J. Hills
Title: Attorney-In-Fact             Title: Attorney-In-Fact





                                    EXHIBIT 2

Waddell & Reed Investment Management Company - Tax ID No. 48-1106973

         Investment Advisor registered under Section 203 of the Investment
         Advisor's Act of 1940





                                    EXHIBIT 3

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, THAT:

         The undersigned Waddell & Reed Financial Services, Inc., a corporation
organized and existing under the laws of the State of Delaware, constitutes and
appoints Wendy J. Hills, Mark P. Buyle and Kristen A. Richards and each of them
severally, its true and lawful attorneys-in-fact on behalf of the corporation
and in its place and stead, in any and all capacities, to execute any and all
Schedules 13G or 13D and any amendments thereto relating to ownership of any
voting equity security of a class which is registered pursuant to Section 12 of
the Securities Exchange Act of 1934, as amended, as required by rules and
regulations promulgated under said Securities Exchange Act of 1934, and to file
the same with all documents required in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done and hereby ratifying and
confirming all said attorneys-in-fact and agents or any of them or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

         IN WITNESS WHEREOF, the corporation has caused this power of attorney
to be executed in its corporate name by its Executive Vice President and its
Secretary corporate seal to be affixed hereto on this 4th day of February, 2000.



                                   Waddell & Reed Financial Services, Inc.


                                   /s/  Robert L. Hechler

                                   Robert L. Hechler
                                   Executive Vice President

Attest:  /s/ Daniel C. Schulte

         Daniel C. Schulte
         Secretary





                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, THAT:

         The undersigned Waddell & Reed, Inc., a corporation organized and
existing under the laws of the State of Delaware, constitutes and appoints Wendy
J. Hills, Mark P. Buyle and Kristen A. Richards and each of them severally, its
true and lawful attorneys-in-fact on behalf of the corporation and in its place
and stead, in any and all capacities, to execute any and all Schedules 13G or
13D and any amendments thereto relating to ownership of any voting equity
security of a class which is registered pursuant to Section 12 of the Securities
Exchange Act of 1934, as amended, as required by rules and regulations
promulgated under said Securities Exchange Act of 1934, and to file the same
with all documents required in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done and hereby ratifying and confirming all said
attorneys-in-fact and agents or any of them or their substitute or substitutes,
may lawfully do or cause to be done by virtue hereof.

         IN WITNESS WHEREOF, the corporation has caused this power of attorney
to be executed in its corporate name by its President and its Secretary
corporate seal to be affixed hereto on this 4th day of February, 2000.



                                        Waddell & Reed, Inc.


                                        /s/  Robert L. Hechler

                                        Robert L. Hechler
                                        President

Attest:  /s/ Daniel C. Schulte

         Daniel C. Schulte
         Secretary





                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, THAT:

         The undersigned Waddell & Reed Investment Management Company, a
corporation organized and existing under the laws of the State of Kansas,
constitutes and appoints Wendy J. Hills, Mark P. Buyle and Kristen A. Richards
and each of them severally, its true and lawful attorneys-in-fact on behalf of
the corporation and in its place and stead, in any and all capacities, to
execute any and all Schedules 13G or 13D and any amendments thereto relating to
ownership of any voting equity security of a class which is registered pursuant
to Section 12 of the Securities Exchange Act of 1934, as amended, as required by
rules and regulations promulgated under said Securities Exchange Act of 1934,
and to file the same with all documents required in connection therewith, with
the Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done and hereby ratifying and
confirming all said attorneys-in-fact and agents or any of them or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

         IN WITNESS WHEREOF, the corporation has caused this power of attorney
to be executed in its corporate name by its Executive Vice President and its
Secretary corporate seal to be affixed hereto on this 4th day of February, 2000.



                               Waddell & Reed Investment Management Company


                               /s/ Robert L. Hechler

                               Robert L. Hechler
                               Executive Vice President

Attest:  /s/ Daniel C. Schulte

         Daniel C. Schulte
         Secretary