TRANSACTION SYSTEMS ARCHITECTS INC
S-4, 1997-03-31
PREPACKAGED SOFTWARE
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As filed with the Securities and Exchange Commission on March 31, 1997

                                                          Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-4
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
             (Exact name of registrant as specified in its charter)

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

                                      7372
            (Primary Standard Industrial Classification Code Number)

                                   47-0772104
                      (I.R.S. Employer Identification No.)

                             330 South 108th Avenue
                              Omaha, Nebraska 68154
                                 (402) 390-7600
   (Address, including ZIP Code, and telephone number, including area code, of
                    registrant's principal executive offices)


                          William E. Fisher, President
                      Transaction Systems Architects, Inc.
                             330 South 108th Avenue
                              Omaha, Nebraska 68154
                                 (402) 390-7600
 (Name, address, including ZIP Code, and telephone number, including area code,
                              of agent for service)

            It is requested that copies of communications be sent to:
                                Neal A. Klegerman
                                Baker & McKenzie
                              One Prudential Plaza
                             Chicago, Illinois 60601

Approximate  date of  commencement  of proposed  sale of the  securities  to the
public:  From  time to  time  after  the  effective  date  of this  Registration
Statement.

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If the securities  being registered on this Form are being offered in connection
with the  formation of a holding  company and there is  compliance  with General
Instruction G, check the following box. [ ]

                         Calculation of Registration Fee
<TABLE>
<CAPTION>

                                                                                      Proposed
       Title of each                                         Proposed                  maximum
class  of securities             Amount to be                 maximum                 aggregate             Amount of
to be   registered                registered         offering                 offering price (1)           registration
                                                          price per unit                                 fee
                                                     (1)
<S>                        <C>                      <C>                     <C>                         <C>                      
- -------------------------- ------------------------  ------------------------ -------------------------  ---------------------------
Class A Common                2,000,000 shares        $  26.00                $   52,000,000             $  15,758
Stock, par                 
value $.005 per
share
========================== ========================  ======================== =========================  ========================

</TABLE>

     (1)  Estimated  solely for the purpose of calculating the  registration fee
          pursuant to Rule 457(c)  promulgated under the Securities Act of 1933,
          as  amended,  based upon the average of the high and low prices of the
          Class A Common  Stock on  March 24, 1997, as  reported  on The  Nasdaq
          National Market.

                                 _______________


     THE REGISTRANT  HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE  ON SUCH  DATE  AS THE  SECURITIES  AND  EXCHANGE  COMMISSION,  ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.

     PURSUANT TO RULE 429 UNDER THE SECURITIES ACT OF 1933, THE PROSPECTUS WHICH
CONSTITUTES  PART OF THIS  REGISTRATION  STATEMENT ALSO RELATES TO THE 1,500,000
SHARES  OF  THE   REGISTRANT'S   CLASS  A  COMMON  STOCK  REGISTERED  UNDER  THE
REGISTRATION  STATEMENT  ON FORM S-4 (NO.  333-09811)  OF WHICH  909,566  SHARES
REMAIN  AVAILABLE  FOR ISSUANCE AND ARE BEING  CARRIED  FORWARD.  THE FILING FEE
ASSOCIATED  WITH THE CLASS A COMMON STOCK CARRIED  FORWARD AND  PREVIOUSLY  PAID
WITH THE EARLIER REGISTRATION STATEMENT IS $9,448.


<PAGE>



Information  contained  herein is  subject to  completion  or  amendment.  A
     registration statement relating to these securities has been filed with the
     Securities and Exchange  Commission.  These  securities may not be sold nor
     may offers to buy be accepted prior to the time the registration  statement
     becomes effective. This prospectus shall not constitute an offer to sell or
     the  solicitation  of an offer to buy nor shall  there be any sale of these
     securities in any State in which such offer,  solicitation or sale would be
     unlawful prior to registration or  qualification  under the securities laws
     of any such State.

               SUBJECT TO COMPLETION, DATED MARCH 31, 1997
                                  
PROSPECTUS

                      TRANSACTION SYSTEMS ARCHITECTS, INC.

                  2,000,000 SHARES OF CLASS A COMMON STOCK
                  
                             -----------------------

     This Prospectus  relates to 2,000,000  shares of Class A Common Stock,  par
value  $.005 per share (the  "Class A Common  Stock"),  of  Transaction  Systems
Architects,  Inc., a Delaware corporation ("TSA" or the "Company"), which may be
offered and issued or reserved  for issuance by the Company from time to time in
connection with  acquisitions by the Company,  directly or indirectly,  of other
businesses  or  properties,  or interests  therein.  Class A Common Stock may be
issued in exchange for shares of capital stock,  partnership interests, or other
assets  representing  an  interest,  direct or indirect,  in other  companies or
entities,  or in exchange  for assets used in or related to the business of such
other companies or entities. See "Securities Covered by This Prospectus."

     The Class A Common  Stock is subject to  quotation  on the Nasdaq  National
Market under the symbol "TSAI."

     SEE "RISK FACTORS" BEGINNING ON PAGE 3 FOR CERTAIN CONSIDERATIONS  RELEVANT
TO AN INVESTMENT IN THE CLASS A COMMON STOCK.

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

     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED  HEREWITH.  THESE  DOCUMENTS ARE AVAILABLE UPON REQUEST FROM
DAVID P. STOKES, GENERAL COUNSEL AND SECRETARY,  TRANSACTION SYSTEMS ARCHITECTS,
INC., 330 SOUTH 108TH AVENUE,  OMAHA,  NEBRASKA  68154,  TELEPHONE  NUMBER (402)
390-7600.  IN ORDER TO ENSURE  TIMELY  DELIVERY  OF THE  DOCUMENTS,  ANY REQUEST
SHOULD  BE MADE  FIVE  BUSINESS  DAYS  PRIOR  TO THE  DATE ON  WHICH  THE  FINAL
INVESTMENT DECISION MUST BE MADE.

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

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
           COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION
               OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
                  ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
                       REPRESENTATION TO THE CONTRARY IS
                              A CRIMINAL OFFENSE.

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

                                  The date of this Prospectus is _________ 1997.
                                                           
<PAGE>

     No  person  has  been  authorized  to give any  information  or to make any
representations  other than those contained or incorporated by reference in this
Prospectus or any Prospectus Supplement, and, if given or made, such information
or  representations  must not be relied upon as having been authorized.  Neither
this Prospectus nor any Prospectus Supplement  constitutes an offer to sell or a
solicitation  of an offer to buy any  securities  other than the  securities  to
which it relates or an offer to sell or the solicitation of an offer to buy such
securities in any circumstances in which such offer or solicitation is unlawful.
Neither the delivery of this  Prospectus nor any  Prospectus  Supplement nor any
offer  or sale  made  hereunder  shall,  under  any  circumstances,  create  any
implication  that there has been no change in the affairs of the  Company  since
the date hereof.

                               TABLE OF CONTENTS

                                                                     Page
                                                                     -----
AVAILABLE INFORMATION                                                  3

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE                      3

RISK FACTORS                                                           3

THE COMPANY                                                            6

SECURITIES COVERED BY THIS PROSPECTUS                                  6

DESCRIPTION OF CAPITAL STOCK                                           6

EXPERTS                                                                8

LEGAL MATTERS                                                          8

<PAGE>

                             AVAILABLE INFORMATION

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith  files  reports,  proxy  statements  and  other  information  with the
Securities  and Exchange  Commission  (the  "Commission").  Such reports,  proxy
statements  and other  information  filed by the  Company can be  inspected  and
copied at the public reference  facilities  maintained by the Commission at Room
1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C.20549 and at the
Commission's  Regional Offices at 14th Floor,  Northwestern  Atrium Center,  500
West Madison Street,  Chicago,  Illinois 60661 and 13th Floor, Seven World Trade
Center,  New York,  New York 10048.  Copies of such  material can be obtained at
prescribed  rates from the Public  Reference  Section of the  Commission  at 450
Fifth Street, N.W., Washington,  D.C. 20549. The Commission maintains a Web site
that contains  reports,  proxy and information  statements and other information
regarding registrants,  including the Company, that file electronically with the
Commission,  and the address of such site is  http://www.sec.gov.  In  addition,
reports,  proxy statements and other information can be inspected at the offices
of The Nasdaq Stock Market,  Reports Section,  1735 K Street, N.W.,  Washington,
D.C. 20006.


     The Company has filed with the Commission a registration  statement on Form
S-4, including  amendments thereto, if any (the "Registration  Statement") under
the Securities Act of 1933, as amended (the "Securities  Act"),  with respect to
the  shares  of Class A  Common  Stock.  This  Prospectus  and any  accompanying
Prospectus  Supplement,  if any, do not contain all of the information set forth
in the Registration Statement,  certain parts of which are omitted in accordance
with the  rules  and  regulations  of the  Commission.  Statements  made in this
Prospectus  as to the  contents of any  contract,  agreement  or other  document
referred to are not  necessarily  complete;  with respect to each such contract,
agreement or other document filed as an exhibit or schedule to the  Registration
Statement,  reference is made to the exhibit or schedule,  as applicable,  for a
more complete description of the matter involved,  and each such statement shall
be deemed qualified in its entirety by such reference.  For further  information
pertaining to the Company and the shares of Class A Common Stock offered hereby,
reference is made to the  Registration  Statement and the exhibits and schedules
thereto, which may be examined or copied at the locations described above.


               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

     The Company hereby  incorporates the following documents in this Prospectus
by reference:  (a) the Company's  Annual Report on Form 10-K for the fiscal year
ended  September 30, 1996; (b) the Company's  Quarterly  Report on Form 10-Q for
the period ended  December 31, 1996;  and (c) the  description  of the Company's
Class A Common Stock  included in the Company's  Registration  Statement on Form
8-A filed with the  Commission  on January  11,  1995  under the  Exchange  Act,
including  any  amendment  or reports  filed for the  purpose of  updating  such
description.

     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the  Exchange  Act after the date of this  Prospectus  and prior to the
termination  of the  offering of the shares of Class A Common  Stock  covered by
this  Prospectus  shall be  deemed to be  incorporated  by  reference  into this
Prospectus and to be a part of this Prospectus from the respective  dates of the
filing of such documents.

     Any  statement  contained  in a document  incorporated  herein by reference
shall be deemed to be modified or superseded for purposes of this  Prospectus to
the  extent  that a  statement  contained  in this  Prospectus  or in any  other
subsequently filed document which also is or is deemed to be incorporated herein
by reference modifies or supersedes such statement. Any statement so modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus.

     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED  HEREWITH.  THESE  DOCUMENTS ARE AVAILABLE UPON REQUEST FROM
DAVID P. STOKES, GENERAL COUNSEL AND SECRETARY,  TRANSACTION SYSTEMS ARCHITECTS,
INC., 330 SOUTH 108TH AVENUE,  OMAHA,  NEBRASKA  68154,  TELEPHONE  NUMBER (402)
390-7600.  IN ORDER TO ENSURE  TIMELY  DELIVERY  OF THE  DOCUMENTS,  ANY REQUEST
SHOULD  BE MADE  FIVE  BUSINESS  DAYS  PRIOR  TO THE  DATE ON  WHICH  THE  FINAL
INVESTMENT DECISION MUST BE MADE.


                                  RISK FACTORS

     In addition to the other  information in this Prospectus and the Prospectus
Supplement,  if any,  and  information  incorporated  herein by  reference,  the
following risk factors should be considered  carefully in evaluating the Company
and its business  before  purchasing  the Class A Common  Stock  offered by this
Prospectus.  Unless the context requires otherwise,  as used in this Prospectus,
"TSA" or the "Company" means Transaction Systems Architects, Inc. and all of its
subsidiaries.


Reliance on BASE24; Lack of Product Diversification

     The Company has derived a substantial  majority of its total  revenues from
licensing  its BASE24  family of software  products and  providing  services and
maintenance related to those products.  The BASE24 products and related services
and  maintenance  are  expected  to  provide  the  substantial  majority  of the
Company's revenues in the foreseeable  future. The Company's results will depend
upon continued market  acceptance of its BASE24 products and related services as
well as the  Company's  ability to continue to adapt and modify them to meet the
changing  needs of its  customers.  Any  reduction in demand for, or increase in
competition  with  respect to,  BASE24  products  would have a material  adverse
effect on the Company's financial condition and results of operations.


International Operations

     The  Company has  derived a majority  of its total  revenues  from sales to
customers  outside the United  States.  International  operations  generally are
subject to certain risks,  including  difficulties  in staffing and  management,
reliance on independent distributors,  fluctuations in foreign currency exchange
rates, compliance with foreign regulatory  requirements,  variability of foreign
economic conditions and changing restrictions imposed by U.S. export laws. There
can be no assurance that the Company will be able to manage the risks related to
selling its products and services in international markets.


Dependence on Banking Industry

     The Company's business is concentrated in the banking industry,  making the
Company  susceptible to a downturn in that industry.  For example, a decrease in
bank  spending  for  software  and related  services  could  result in a smaller
overall  market for electronic  payment  software.  Furthermore,  U.S. banks are
continuing to consolidate, decreasing the overall potential number of buyers for
the Company's products and services.  These factors as well as others negatively
affecting  the  banking  industry  could have a material  adverse  effect on the
Company's financial condition and results of operations.


Relationship with Tandem

     Historically,  the Company has derived a  substantial  portion of its total
revenues  from the  licensing  of  software  products  that  operate  on  Tandem
computers.  The BASE24 product line runs exclusively on Tandem computers.  These
products are expected to provide a substantial portion of the Company's revenues
in the  foreseeable  future.  The  Company's  future  results  depend  on market
acceptance  of Tandem  computers  and the  financial  success of Tandem.  Tandem
securities  are  publicly  traded  and its  financial  statements  are  publicly
available. Any reduction in demand for these computers or in Tandem's ability to
deliver  products on a timely basis could have a material  adverse effect on the
Company's financial condition and results of operations.

     Although the Company has several written  agreements  with Tandem,  none of
those  agreements  governs  the  primary  relationship  between  the Company and
Tandem, which is that the Company's major product line, BASE24, runs exclusively
on Tandem  computers.  While the  cooperation and past  affiliation  between the
Company and Tandem have facilitated the Company's  ability to develop and market
Tandem-compatible  products,  this cooperation is not mandated by contract,  and
the cessation of such cooperation would adversely affect the Company's business.
None of the  Company's  agreements  with  Tandem  would  protect  the Company if
Tandem's  cooperation  ceased or if Tandem were unable to deliver  products on a
timely basis. The written  agreements cover such discrete matters as commissions
on the sale of certain Tandem  products,  certain limited resales by the Company
of Tandem  products and the  distribution  of the  Company's  products by Tandem
affiliates in a limited number of countries. 

Management of Growth

     The Company is  experiencing a period of growth which is placing demands on
its managerial and operations  resources.  The Company's inability to manage its
growth  effectively  or to  maintain  its current  level of growth  could have a
material adverse effect on its financial condition and results of operations.


Attraction and Retention of Key Personnel

     The Company's  success  depends on certain of its executive  officers,  the
loss  of one or more  of  whom  could  have a  material  adverse  effect  on the
Company's financial  condition and results of operations.  None of the Company's
U.S.-based executive officers is a party to an employment agreement. The Company
believes  that its future  success  also  depends on its  ability to attract and
retain highly-skilled technical,  managerial and marketing personnel, including,
in particular, additional personnel in the areas of research and development and
technical  support.  Competition  for  personnel  is  intense.  There  can be no
assurance  that the Company will be successful  in attracting  and retaining the
personnel it requires.


Competition

     The market for  electronic  payment  software is highly  competitive.  Many
applications  software vendors offer products that are directly competitive with
BASE24  and  other  products  of  the  Company.  The  Company  also  experiences
competition  from  software  developed  internally  by potential  customers  and
experiences  competition for its consulting services from professional  services
organizations.  In addition,  processing  companies  provide services similar to
those made possible by the Company's products. Many of the Company's current and
potential competitors have significantly greater financial, marketing, technical
and  other  competitive  resources  than  the  Company.  Current  and  potential
competitors,  including providers of transaction-based software,  processing, or
professional services, may establish cooperative  relationships with one another
or with third  parties to compete more  effectively  against the Company.  It is
also  possible that new  competitors  may emerge and acquire  market  share.  In
either case, the Company's  financial  condition and results of operations could
be adversely affected.


New Products and Technological Change

     The market for  software  in general is  characterized  by rapid  change in
computer hardware and software technology and is highly competitive with respect
to the need for timely  product  innovation and new product  introductions.  The
Company believes that its future success depends upon its ability to enhance its
current  applications  and develop new products  that  address the  increasingly
complex needs of customers.  In  particular,  the Company  believes that it must
continue to respond  quickly to users' needs for  additional  functionality  and
multi-platform  support.  The  introduction  and  marketing  of new or  enhanced
products  requires the Company to manage the transition from current products in
order to minimize  disruption in customer purchasing  patterns.  There can be no
assurance  that  the  Company  will  continue  to be  successful  in the  timely
development  and marketing of product  enhancements or new products that respond
to  technological  advances,  that its new products will adequately  address the
changing  needs  of the  domestic  and  international  markets  or  that it will
successfully manage the transition from current products.

     The Company is continually  developing new products,  product  versions and
individual  features  within  a  large,  complex  software  system.  Development
projects  can be lengthy and are subject to changing  requirements,  programming
difficulties  and  unforeseen   factors  which  can  result  in  delays  in  the
introduction of new products and features.  Delays could have a material adverse
effect on the Company's financial condition and results of operations.

     In addition, new products, versions or features, when first released by the
Company, may contain undetected errors that, despite testing by the Company, are
discovered  only after a product has been  installed and used by  customers.  To
date,   undetected  errors  have  not  caused   significant  delays  in  product
introduction  and  installation or required  substantial  design  modifications.
However,  there can be no assurance that the Company will avoid problems of this
type in the future.

     A substantial majority of the Company's license fee revenue is generated by
licenses for software  products  designed to run on  fault-tolerant or mainframe
computers.  Industry  sources  indicate  that sales of mainframe  computers  are
declining on a unit basis,  and the Company expects this trend to continue.  The
Company has  developed,  and  continues to develop,  certain  products for other
platforms,  but to date revenues from these products have not been  significant.
There can be no assurance  that the Company will be  successful in selling these
software products or other products under development.  The Company's failure in
this regard could have a material adverse effect on its financial  condition and
results of operations.


Dependence on Proprietary Technology

     The Company  relies on a combination  of trade secret and  copyright  laws,
nondisclosure  and other  contractual  and  technical  measures  to protect  its
proprietary  rights  in its  products.  There  can be no  assurance  that  these
provisions will be adequate to protect its proprietary rights. In addition,  the
laws of certain foreign countries do not protect intellectual property rights to
the same extent as the laws of the United States.  Although the Company believes
that its  intellectual  property  rights do not  infringe  upon the  proprietary
rights of third  parties,  there can be no assurance that third parties will not
assert infringement claims against the Company.


Variability of Quarterly Operating Results

     The  Company's  quarterly  revenues  and  operating  results may  fluctuate
depending on the timing of executed contracts, license upgrades and the delivery
of contracted  business  during the quarter.  In addition,  quarterly  operating
results may fluctuate  due to the extent of  commissions  associated  with third
party product sales,  timing of the Company's  hiring of additional  staff,  new
product development and other expenses. No assurance can be given that operating
results will not vary due to these factors.  Fluctuations in quarterly operating
results may result in volatility in the Company's stock price.


Customer Cancellation of Contracts

     The  Company  derives a  substantial  portion  of its total  revenues  from
maintenance  fees and monthly  software license fees pursuant to contracts which
the customer has the right to cancel.  A substantial  number of cancellations of
these maintenance or monthly license fee contracts would have a material adverse
effect on the Company's financial condition and results of operations.


Possible Volatility of Stock Price

     The stock market has from time to time experienced extreme price and volume
fluctuations,  particularly in the high technology sector, which have often been
unrelated to the operating performance of particular companies. Any announcement
with  respect to any  variance  in revenue or  earnings  from  levels  generally
expected by  securities  analysts for a given period could have an immediate and
significant  effect  on the  trading  price  of the  Class A  Common  Stock.  In
addition,  factors such as  announcements  of  technological  innovations or new
products by the Company,  its  competitors  or other third  parties,  as well as
changing market conditions in the computer software or hardware industries,  may
have a significant impact on the market price of the Class A Common Stock.


Control by Existing Stockholders

     The Company's  directors and officers and their affiliates in the aggregate
beneficially  own a  substantial  percentage of the  outstanding  Class A Common
Stock. As a result,  these  stockholders,  if acting together,  would be able to
influence  most  matters  requiring  approval  by  the  Company's  stockholders,
including the election of directors.  In addition,  the Company's Certificate of
Incorporation  contains provisions that may discourage  acquisition bids for the
Company.  The effect of such provisions may be to limit the price that investors
might be willing to pay in the future for shares of the Class A Common Stock.


                                  THE COMPANY

     The  Company  develops,  markets  and  supports  a broad  line of  software
products and services primarily focused on facilitating electronic payments. The
Company's  software products are used to process  transactions  involving credit
cards,  debit cards,  smart cards,  checks,  automated  teller  machines  (ATM),
point-of-sale  (POS)  terminals,  manned teller devices,  remote  banking,  wire
transfers and automated  clearing house (ACH) functions.  The Company's products
and services assist  customers in operating large,  complex networks  performing
such  functions as transaction  authorization,  transaction  routing,  debit and
credit card management, transaction settlement and reporting.

     The Company was formed for the purpose of acquiring Applied Communications,
Inc. and Applied  Communications  Inc. Limited,  which were acquired on December
31,  1993.  On January 3, 1994,  the Company  acquired  U.S.  Software,  Inc. 
Since that time, the Company has completed several acquisitions complementary
to its business. The principal executive offices of the Company are located at
330 South 108th Avenue,  Omaha,  Nebraska 68154,  and its telephone  number is 
(402) 390-7600.


                     SECURITIES COVERED BY THIS PROSPECTUS

     This Prospectus  relates to 2,000,000  shares of Class A Common Stock which
may be offered and issued or reserved  for  issuance by the Company from time to
time in connection with the acquisition by the Company,  directly or indirectly,
of other businesses or properties, or interests therein. It is expected that the
terms of acquisitions  involving the issuance of Class A Common Stock covered by
this  Prospectus  will be determined by direct  negotiations  with the owners or
controlling persons of the businesses or properties,  or interest therein, to be
acquired by the Company,  or, in the case of entities that are more widely held,
through  exchange  offers to stockholders  or documents  soliciting  stockholder
approval  of  mergers,  consolidations,  plans  of share  exchange,  or sales of
assets.  It is also expected that the shares of Class A Common Stock issued will
be valued at prices  reasonably  related to quoted  market  prices either at the
time the  terms of an  acquisition  are  agreed  upon or at or about the time of
delivery of such shares.


                          DESCRIPTION OF CAPITAL STOCK

     The Company's  Amended and Restated  Certificate of Incorporation  provides
that authorized  capital stock of the Company  consists of 50,000,000  shares of
Class A Common Stock,  par value $0.005 per share,  5,000,000  shares of Class B
Common Stock,  par value $0.005 per share,  and  5,450,000  shares of redeemable
convertible  preferred  stock,  par value of $0.01 per share.  Unless  otherwise
indicated,  references in this  Prospectus  to "Common  Stock" refer to both the
Company's Class A Common Stock and Class B Common Stock.


Common Stock

     The  Class A Common  Stock and Class B Common  Stock  have the same  rights
except that  holders of Class B Common  Stock are not entitled to vote except as
provided by law.  Holders of Class A Common  Stock are  entitled to one vote per
share on all matters to be voted on by the stockholders.  Subject to preferences
that may be applicable to any preferred stock  outstanding at the time,  holders
of Common Stock are entitled to receive ratably such  dividends,  if any, as may
be declared  from time to time by the Board of  Directors  out of funds  legally
available therefor. In the event of a liquidation,  dissolution or winding up of
the Company,  holders of all Common  Stock are entitled to share  ratably in all
assets remaining after payment of the Company's  liabilities and the liquidation
preference,  if any, of any outstanding preferred stock. Holders of Common Stock
have no  preemptive  rights and no rights to convert  their Class A Common Stock
into any other securities,  and there are no redemption  provisions with respect
to shares of Common  Stock.  All of the  outstanding  shares of Common Stock are
fully paid and non-assessable. The rights, preferences and privileges of holders
of Common Stock are subject to, and may be adversely  affected by, the rights of
the  holders of shares of any series of  preferred  stock  which the Company may
designate and issue in the future.


Preferred Stock

     The Board of  Directors  has the  authority,  without any  further  vote or
action by the  stockholders,  to provide  for the  issuance  of up to  5,450,000
shares of  redeemable  convertible  preferred  stock from time to time in one or
more series with such designations,  rights,  preferences and limitations as the
Board of Directors may determine, including the consideration received therefor,
the  number  of  shares  comprising  each  series,  dividend  rates,  redemption
provisions,  liquidation preferences, sinking fund provisions, conversion rights
and voting rights, all without approval by the holders of Common Stock. Although
it is not  possible to state the effect that any  issuance  of  preferred  stock
might have on the rights of holders of Common  Stock,  the issuance of preferred
stock may have one or more of the  following  effects (i) restrict  Common Stock
dividends  if  preferred  stock  dividends  have not been paid,  (ii) dilute the
voting power and equity  interest of holders of Common  Stock,  or (iii) prevent
current holders of Common Stock from  participating in the Company's assets upon
liquidation  until any liquidation  preferences  granted to holders of preferred
stock are  satisfied.  In addition,  the issuance of preferred  stock may, under
certain  circumstances,  have the effect of  discouraging a change in control of
the Company by, for  example,  granting  voting  rights to holders of  preferred
stock that  require  approval by the  separate  vote of the holders of preferred
stock for any amendment to the  Company's  Amended and Restated  Certificate  of
Incorporation  or any  reorganization,  consolidation,  merger (or other similar
transaction  involving the Company). As a result, the issuance of such preferred
stock may discourage  bids for the Company's  Common Stock at a premium over the
market  price  therefor and could have a material  adverse  effect on the market
value  of  the  Common  Stock.  No  shares  of  preferred  stock  are  currently
outstanding.


Registration Rights

     Certain  rights  with  respect to  registration  of their  stock  under the
Securities  Act  exist  for  holders  of shares  of  Common  Stock  issued  upon
conversion  of  the  Company's  Senior  Convertible   Preferred  Stock  ("Senior
Conversion  Shares"),  holders of shares of Common Stock issued upon exercise of
certain stock purchase  warrants  ("Warrant  Exercise  Shares"),  and holders of
shares  of  Common  Stock  issued  upon  conversion  of  the  Company's   Junior
Convertible  Preferred  Stock,  shares  of Class A Common  Stock  issuable  upon
exercise of stock options  issuable to employees of the Company  pursuant to the
Company's Incentive Stock Option Plan and certain other shares of Class A Common
Stock (collectively  "Junior Restricted  Stock").  The Senior Conversion Shares,
Warrant Exercise Shares, and Junior Restricted Stock are hereafter  collectively
referred to as the "Restricted Stock." The registration rights arise pursuant to
an  agreement  entered  into at the time of the  sale of  underlying  shares  of
Preferred  Stock and warrants.  Holders of not less than 30% of the  outstanding
Senior  Conversion Shares may demand that the Company register for sale all or a
portion of their shares. With certain  exceptions,  the Company is not generally
required  to effect  more  than two such  registrations.  In the event  that the
holders  making the demand  request  registration  of less than all their Senior
Conversion  Shares, the Company is required to effect a registration only if the
demand  covers  at least 20% of the total  number  of Senior  Conversion  Shares
originally  issued  (or  a  lesser  percentage  if  the  reasonably  anticipated
aggregate  public  offering price would exceed  $5,000,000).  Subject to certain
limitations,  at such time as the Company is eligible to register  its shares on
Form S-3,  holders of the Warrant  Exercise Shares may demand,  on one occasion,
that the Company register  Warrant  Exercise Shares on that form,  provided that
the reasonably  anticipated  aggregate  offering price would exceed  $4,000,000.
Furthermore,  if the Company proposes to register any of its securities,  either
for its own account or that of selling security holders, the Company is required
to notify holders of Restricted  Stock, and subject to certain  limitations,  to
include in such  registration  all the shares  requested  to be included by such
holders.  The Company is generally  obligated to bear the  expenses,  other than
underwriting  discounts and sale commissions,  of all of these registrations and
to indemnify the sellers  against  certain  liabilities,  including  liabilities
under the Securities Act.


Limitation of Liability

     The Company's Amended and Restated  Certificate of Incorporation limits the
liability of directors to the maximum extent permitted by Delaware law. Delaware
law provides that directors of a corporation  will not be personally  liable for
monetary  damages for breach of their fiduciary  duties as directors,  including
gross  negligence,  except  liability for (i) breach of the  directors'  duty of
loyalty,  (ii) acts or omissions not in good faith or which involve  intentional
misconduct or a knowing  violation of the law,  (iii) the unlawful  payment of a
dividend or unlawful stock purchase or redemption and (iv) any transaction  from
which the director derives an improper personal  benefit.  Delaware law does not
permit a corporation to eliminate a director's  duty of care, and this provision
of the Company's revised Restated  Certificate of Incorporation has no effect on
the availability of equitable remedies, such as injunction or rescission,  based
upon a director's breach of the duty of care.

     The Company's Amended and Restated Certificate of Incorporation  authorizes
the   Company  to  purchase   and   maintain   insurance   for  the  purpose  of
indemnification.


Delaware Law

     Under Section 203 of the Delaware General  Corporation Law ("Section 203"),
certain  "business  combinations"  between a Delaware  corporation  whose  stock
generally is publicly  traded or held of record by more than 2,000  stockholders
and an "interested stockholder" are prohibited for a three-year period following
the date that such stockholder became an interested stockholder,  unless (i) the
corporation has elected in its original  certificate of incorporation  not to be
governed by Section 203 (the  Company did not make such an  election),  (ii) the
business  combination  was approved by the board of directors of the corporation
before  the  other  party  to the  business  combination  became  an  interested
stockholder,  (iii)  upon  consummation  of  the  transaction  that  made  it an
interested  stockholder,  the interested  stockholder  owned at least 85% of the
voting  stock  of  the  corporation  outstanding  at  the  commencement  of  the
transaction  (excluding voting stock owned by directors who are also officers or
held in employee benefit plans in which the employees do not have a confidential
right to tender or vote stock held by the plan) or (iv) the business combination
was  approved  by the board of  directors  of the  corporation  and  ratified by
two-thirds of the voting stock which the interested stockholder did not own. The
three-year  prohibition  also does not apply to  certain  business  combinations
proposed by an interested stockholder following the announcement or notification
of certain extraordinary transactions involving the corporation and a person who
had not been an interested  stockholder  during the previous  three years or who
became an  interested  stockholder  with the  approval  of the  majority  of the
corporation's directors. The term "business combination" is defined generally to
include  mergers  or  consolidations  between  a  Delaware  corporation  and  an
"interested   stockholder,"   transactions  with  an  "interested   stockholder"
involving  the  assets  or  stock  of  the  corporation  or  its  majority-owned
subsidiaries  and  transactions  which  increase  an  interested   stockholder's
percentage  ownership of stock.  The term  "interested  stockholder"  is defined
generally as a stockholder  who,  together with affiliates and associates,  owns
(or, within three years prior, did own) 15% or more of a Delaware  corporation's
voting stock.  Section 203 could  prohibit or delay a merger,  takeover or other
change in control of the  Company and  therefore  could  discourage  attempts to
acquire the Company.


Transfer Agent and Registrar

     The  transfer  agent and  registrar  of the Class A Common Stock is Norwest
Bank Minnesota, N.A.

                                    EXPERTS

     The financial  statements and schedules incorporated  in this Prospectus by
reference to the Company's  Annual Report on Form 10-K for the fiscal year ended
September 30, 1996, have been audited by Arthur Andersen LLP, independent public
accountants,  as indicated in their reports with respect thereto,  and have been
so incorporated in reliance upon the authority of said firm as experts in giving
said reports.

     Future  financial  statements  and schedules of the company and the reports
thereon  of  the  Company's   independent   public   accountants  also  will  be
incorporated  by reference in this  Prospectus in reliance upon the authority of
those  accountants  as experts  in giving  those  reports  to the  extent  those
accountants have audited those financial statements and consented to the use of
their reports thereon.

                                 LEGAL MATTERS

     The  validity  of the  Class  A  Common  Stock  offered  pursuant  to  this
Prospectus  will be passed upon for the  Company by Baker &  McKenzie,  Chicago,
Illinois.

<PAGE>

                                    PART II.

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20. Indemnification of Directors and Officers

     Section 145 of the General Corporation Law of the State of Delaware permits
indemnification by a corporation of certain officers,  directors,  employees and
agents.  Consistent  therewith,  Article  Tenth  of the  Company's  Amended  and
Restated Certificate of Incorporation  provides that the Company, to the fullest
extent  authorized by the General  Corporation Law of the State of Delaware,  as
the same  exists  or may  hereafter  be  amended  (but,  in the case of any such
amendment, only to the extent that such amendment permits the Company to provide
broader  indemnification  rights than such law  permitted the Company to provide
prior to such amendment), to indemnify a director or officer of the Company or a
person who is or was serving at the request of the Company as director, officer,
employee or agent of another  corporation  or of a  partnership,  joint venture,
trust or other enterprise, including service with respect to an employee benefit
plan,  who was or is made  (or  threatened  to be  made)  a  party  to a  civil,
criminal,  administrative or investigative proceeding (an "indemnified person").
Article Tenth also provides that expenses incurred by an indemnified person will
be paid in advance by the  Company;  provided,  however,  that,  if the  General
Corporation  Law of the State of Delaware  requires,  an advancement of expenses
incurred by an indemnified  person incurred in his or her capacity as a director
or officer shall be made only if the Company  receives an  undertaking  by or on
behalf of the  indemnified  person to repay all  amounts so advanced if it shall
ultimately  be  determined  by final  judicial  decision  from which there is no
further  right to appeal  that such  indemnified  person is not  entitled  to be
indemnified for such expenses.

     Under a registration  rights  agreement  between the Company and certain of
its stockholders,  the Company agreed to indemnify each stockholder  selling his
or her shares  thereunder  in  connection  with any losses,  claims,  damages or
liabilities  arising out of certain acts or  omissions of the Company.  Under an
agreement  with the  purchasers of the Company's  Senior  Convertible  Preferred
Stock and warrants,  the Company  indemnified the purchasers with respect to any
misrepresentation  or breach of any  representation or warranty or noncompliance
with any  conditions or other  agreements  given or made in connection  with the
agreement or the transactions contemplated therein.



                                     II - 1

<PAGE>




     Item 21. Exhibits and Financial Statement Schedules

           A. Exhibits

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

2.01*             Senior Convertible Preferred Stock and Warrant Purchase
                  Agreement among ACI Holdings, Inc. and the Several Named
                  Purchasers Named therein, dated as of December 31, 1993

2.02*             Stock Purchase Agreement between and among Tandem
                  Computers Incorporated, Tandem Computers Limited, Applied
                  Communications, Inc., Applied Communications Inc. Limited
                  and ACI Holding, Inc., dated November 8, 1993, and
                  amendments thereto

2.03*             Stock Purchase Agreement between and among U S Software
                  Holding, Inc., Michael J. Scheier, Trustee, Michael J.
                  Scheier and ACI Holding, Inc., dated December 13, 1993,
                  and amendments thereto

2.04*             Stock and Warrant Holders Agreement, dated as of December
                  30, 1993

2.05*             Credit Agreement among ACI Transub, Inc., ACI Holding,
                  Inc., certain lenders and Continental Bank N.A., as
                  Agent, dated December 31, 1993, including Amendment No.
                  1 to Credit Agreement and Amendment No. 2 to Credit
                  Agreement and Consent

2.06*             Letter Agreement among ACI Holding, Inc., Alex. Brown and
                  Sons, Incorporated and Kirkpatrick Pettis Smith Polian,
                  Inc., and amendment thereto

2.07*             ACI Management Group Investor Subscription Agreement,
                  dated as of December 30, 1993

2.08**            Asset Purchase Agreement Between 1176484 Ontario Inc. and
                  TXN Solution Integrators Dated June 3, 1996

2.09***           Stock Exchange Agreement by and among the Company,
                  Grapevine Systems, Inc. and certain principal
                  shareholders of Grapevine Systems, Inc., dated as of June
                  15, 1996

4.01*             Form of Common Stock Certificate

5.01              Opinion of Baker & McKenzie

23.01             Consent of Independent Public Accountants

                                     II - 2

<PAGE>





23.02             Consent of Baker & McKenzie (included in opinion filed as
                  Exhibit 5.01)

24.01             Power of Attorney (contained in Signature Page)



*        Incorporated by reference to the exhibit of the same number to
         the Registrant's Registration Statement No. 33-88292 on Form
         S-1.
**       Incorporated  by  reference  to the  exhibit of the same  number to the
         Registrant's  Current  Report on Form 8-K dated  June 3, 1996  filed on
         June 17, 1996, as amended by the  Registrant's  Current  Report on Form
         8-K(A) filed on July 15, 1996.
***      Incorporated by reference to the exhibit of the same number to
         the Registrant's Registration Statement No. 333-09811 on Form
         S-4.


Item 22.      Undertakings

         (a)  The undersigned registrant hereby undertakes:

                  (1) To file,  during any  period in which  offers or sales are
being made, a post-effective amendment to this Registration Statement:

                    (i)  To include any prospectus  required by Section 10(a)(3)
                         of the Securities Act of 1933;

                    (ii) To  reflect  in the  prospectus  any  facts  or  events
                         arising  after the effective  date of the  Registration
                         Statement (or the most recent post-effective  amendment
                         thereof)  which,  individually  or  in  the  aggregate,
                         represent a fundamental  change in the  information set
                         forth in the  Registration  Statement.  Notwithstanding
                         the  foregoing,  any increase or decrease in the volume
                         of securities offered (if the total value of securities
                         offered would not exceed that which was registered) and
                         any deviation from the low or high end of the estimated
                         maximum  offering range may be reflected in the form of
                         prospectus  filed with the Commission  pursuant to Rule
                         424(b) if, in the aggregate,  the changes in volume and
                         price  represent  no  more  than  a 20%  change  in the
                         maximum  aggregate offering price set forth in the
                         "Calculation of Registration Fee" table in the 
                          effective Registration Statement; and

                                     II - 3

<PAGE>



                   (iii) To include any  material  information  with  respect to
                         the plan of  distribution  not previously  disclosed in
                         the  Registration  Statement or any material  change to
                         such   information  in  the   Registration   Statement;

          provided,  however,  that paragraphs  (a)(1)(i) and (a)(1)(ii) do
          not  apply  if  the   information   required   to  be  included  in  a
          post-effective  amendment by those paragraphs is contained in periodic
          reports filed with or furnished to the  Commission  by the  registrant
          pursuant to section 13 or section 15(d) of the Securities Exchange Act
          of  1934  that  are  incorporated  by  reference  in the  Registration
          Statement.



                  (2) That, for the purpose of determining  any liability  under
the Securities Act of 1933, each such  post-effective  amendment shall be deemed
to be a new registration  statement  relating to the securities offered therein,
and the  offering  of such  securities  at that  time  shall be deemed to be the
initial bona fide offering thereof.

                  (3) To remove from  registration by means of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

         (b) The undersigned  registrant hereby undertakes that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Securities  Exchange  Act of 1934  (and,  where  applicable,  each  filing of an
employee  benefit  plan's  annual  report  pursuant  to  Section  15(d)  of  the
Securities  Exchange  Act of 1934)  that is  incorporated  by  reference  in the
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (c) The undersigned registrant hereby undertakes as follows: that prior
to any public reoffering of the securities registered hereunder through use of a
prospectus  which is a part of this  registration  statement,  by any  person or
party who is deemed to be an underwriter  within the meaning of Rule 145(c), the
issuer  undertakes that such reoffering  prospectus will contain the information
called for by the  applicable  registration  form with respect to reofferings by
persons who may be deemed  underwriters,  in addition to the information  called
for by the other Items of the applicable form.

         (d)  The registrant undertakes that every prospectus: (i) that
is filed pursuant to paragraph (c) immediately preceding, or (ii)
that purports to meet the requirements of Section 10(a)(3) of the

                                     II - 4

<PAGE>


Act and is used in  connection  with an offering of  securities  subject to Rule
415, will be filed as a part of an amendment to the  registration  statement and
will not be used until such  amendment is effective,  and that,  for purposes of
determining   any  liability  under  the  Securities  Act  of  1933,  each  such
post-effective  amendment  shall be  deemed to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (e) The undersigned registrant hereby undertakes to respond to requests
for information  that is incorporated by reference into the prospectus  pursuant
to Items 4,  10(b),  11 or 13 of this  Form S- 4,  within  one  business  day of
receipt of such request,  and to send the incorporated  documents by first class
mail or other equally  prompt  means.  This  includes  information  contained in
documents filed subsequent to the effective date of the  Registration  Statement
through the date of responding to the request.

         (f) The undersigned  registrant hereby undertakes to supply by means of
a  post-effective  amendment all information  concerning a transaction,  and the
company  being  acquired  involved  therein,  that  was not the  subject  of and
included in the Registration Statement when it became effective.

         (g)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act may be permitted to directors,  officers and controlling  persons
of the  registrant  pursuant to the  foregoing  provisions,  or  otherwise,  the
registrant  has been advised that in the opinion of the  Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against such  liabilities  (other than the payment by the registrant of expenses
incurred or paid by a director,  officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.


                                     II - 5

<PAGE>

                                   SIGNATURES

         Pursuant to the  requirements of the Securities Act, the registrant has
duly  caused  this  Registration  Statement  to be signed  on its  behalf by the
undersigned, thereunto duly authorized, in the City of Omaha, State of Nebraska,
on March 31, 1997.

                                            TRANSACTION SYSTEMS ARCHITECTS, INC.


                                             By:    /s/ William E. Fisher
                                                 ---------------------------  
                                                        William E. Fisher
                                                            President

                                POWER Of ATTORNEY

         We, the  undersigned  officers  and  directors of  Transaction  Systems
Architects,  Inc.,  hereby  severally and  individually  constitute  and appoint
William E. Fisher,  Gregory J. Duman,  David P. Stokes and Dwight G. Hanson, and
each of them, the true and lawful  attorneys and agents of each of us to execute
in the name,  place and stead of each of us  (individually  and in any  capacity
stated below) any and all amendments to this Registration Statement on Form S-4,
including  any  post-effective   amendments,  and  any  additional  Registration
Statement  filed  pursuant to Rule 462(b) under the  Securities Act of 1933, and
all instruments  necessary or advisable in connection  therewith and to file the
same,  with all exhibits  thereto and other  documents in connection  therewith,
with the Securities and Exchange  Commission,  each of said attorneys and agents
to have  power to act with or  without  the  other  and to have  full  power and
authority to do and perform in the name and on behalf of each of the undersigned
every act whatsoever  necessary or advisable to be done in the premises as fully
and to all intents and purposes as any of the  undersigned  might or could do in
person,  and we hereby ratify and confirm other signatures as they may be signed
by our said  attorneys and agents and each of them to any and all such amendment
and amendments.


         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

         Name                Title                                       Date
        ------               -----                                       ----
/s/ William E. Fisher        Director and President                         
- ---------------------       (Principal Executive Officer)         March 31, 1997
  William E. Fisher                                               


/s/ Gregory J. Duman         Chief Financial Officer              March 31, 1997
- --------------------        (Principal Financial Officer)        
 Gregory J. Duman                                             


/s/ Dwight G. Hanson          Controller (Principal               March 31, 1997
- --------------------         (Accounting Officer)                 
   Dwight G. Hanson           

/s/ David C. Russell          Director                            March 31, 1997
- --------------------                                              
   David C. Russell


/s/ Jim D. Kever              Director                            March 31, 1997
- ----------------                                                  
  Jim D. Kever


/s/ Promod Haque              Director                            March 31, 1997
- -----------------                                                 
  Promod Haque


/s/ Frederick L. Bryant       Director                            March 31, 1997
- -----------------------                                           
  Frederick L. Bryant


/s/ Charles E. Noell, III     Director                            March 31, 1997
- -------------------------                                         
  Charles E. Noell, III


/s/ Larry G. Fendley          Director                            March 31, 1997
- -----------------------                                           
   Larry G. Fendley

<PAGE>


                                  EXHIBIT INDEX


 Exhibit
 Number                                   Description                     
- -----------       --------------------------------------------------------------
2.01*             Senior Convertible Preferred Stock and Warrant Purchase
                  Agreement among ACI Holdings, Inc. and the Several Named
                  Purchasers Named therein, dated as of December 31, 1993

2.02*             Stock Purchase Agreement between and among Tandem
                  Computers Incorporated, Tandem Computers Limited, Applied
                  Communications, Inc., Applied Communications Inc. Limited
                  and ACI Holding, Inc., dated November 8, 1993, and
                  amendments thereto

2.03*             Stock Purchase Agreement between and among U S Software
                  Holding, Inc., Michael J. Scheier, Trustee, Michael J.
                  Scheier and ACI Holding, Inc., dated December 13, 1993,
                  and amendments thereto

2.04*             Stock and Warrant Holders Agreement, dated as of December
                  30, 1993

2.05*             Credit Agreement among ACI Transub, Inc., ACI Holding,
                  Inc., certain lenders and Continental Bank N.A., as
                  Agent, dated December 31, 1993, including Amendment No.
                  1 to Credit Agreement and Amendment No. 2 to Credit
                  Agreement and Consent

2.06*             Letter Agreement among ACI Holding, Inc., Alex. Brown and
                  Sons, Incorporated and Kirkpatrick Pettis Smith Polian,
                  Inc., and amendment thereto

2.07*             ACI Management Group Investor Subscription Agreement,
                  dated as of December 30, 1993

2.08**            Asset Purchase Agreement Between 1176484 Ontario Inc. and
                  TXN Solution Integrators Dated June 3, 1996

2.09***           Stock Exchange Agreement by and among the Company,
                  Grapevine Systems, Inc. and certain principal
                  shareholders of Grapevine Systems, Inc., dated as of June
                  15, 1996

4.01*             Form of Common Stock Certificate

5.01              Opinion of Baker & McKenzie

23.01             Consent of Independent Public Accountants


<PAGE>

23.02             Consent of Baker & McKenzie (included in opinion filed as
                  Exhibit 5.01)

24.01             Power of Attorney (contained in Signature Page)

                           

*        Incorporated by reference to the exhibit of the same number to
         the Registrant's Registration Statement No. 33-88292 on Form
         S-1.
**       Incorporated by reference to the exhibit of the same number to
         the Registrant's Current Report on Form 8-K dated June 3, 1996
         filed on June 17, 1996, as amended by the Registrant's Current
         Report on Form 8-K(A) filed on July 15, 1996.
***      Incorporated by reference to the exhibit of the same number to
         the Registrant's Registration Statement No. 333-09811 on Form
         S-4.

<PAGE>

                                                                   Exhibit 5.01

                                BAKER & McKENZIE
                                Attorneys at Law

                              One Prudential Plaza
                             130 East Randolph Drive
                             Chicago, Illinois 60601

                                 March 31, 1997


Board of Directors
Transaction Systems Architects, Inc.
330 South 108th Avenue
Omaha, Nebraska 68154

         Re:  Transaction Systems Architects, Inc. (the "Company")

Gentlemen:

     We have acted as your counsel in  connection  with the  registration,  on a
Registration  Statement  on Form S-4 (the  "Registration  Statement")  under the
Securities Act of 1933, as amended, of 2,000,000 shares of the Company's Class A
Common  Stock,  $.005 par value per  share  (the  "Stock"),  to be issued by the
Company  from  time to time in  connection  with  acquisitions  by the  Company,
directly or indirectly, of other businesses or properties, or interests therein.
We have  reviewed  the  Registration  Statement,  the charter and by-laws of the
Company,  corporate  proceedings  of the  Board  of  Directors  relating  to the
issuance of the shares of Stock, and such other documents, corporate records and
questions of law as we have deemed  necessary  to the  rendering of the opinions
expressed below.

     Based upon the foregoing,  we are of the opinion that the 2,000,000  shares
of Stock to be issued by the Company as described in the Registration  Statement
are duly authorized and, when issued and paid for in the manner  contemplated in
the Registration  Statement  and upon approval by the Board of Directors of the
acquisition  in which  shares of Stock will be issued,  will be legally  issued,
fully paid and non-assessable shares of Class A Common Stock of the Company.

     We hereby  consent to the  reference  to our firm under the caption  "Legal
Matters" in the  prospectus  included in the  Registration  Statement and to the
filing of this opinion as an exhibit thereto.

                                                              Very truly yours,


                                                              BAKER & McKENZIE


                                                                   Exhibit 23.01



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

     As independent public  accountants,  we hereby consent to the incorporation
by  reference  in this Form S-4  Registration  Statement  of our  reports  dated
October 31, 1996,  included in  Transaction  Systems  Architects,  Inc.'s Annual
Report 10-K on Form for the fiscal year ended  September  30,  1996,  and to all
references to our Firm included in this Registration Statement.

                                                        ARTHUR ANDERSEN LLP

Omaha, Nebraska
March 27, 1997



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