ZYCAD CORP
S-3/A, 1996-08-02
ELECTRONIC COMPUTERS
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<PAGE>
   
   As filed with the Securities and Exchange Commission on August 2, 1996
                                               Registration No. 333-08089
    
                      SECURITIES AND EXCHANGE COMMISSION
                           Washington,  D.C.  20549

   
                               AMENDMENT NO. 1
                                      TO
                                   FORM S-3
    

                         REGISTRATION STATEMENT UNDER
                          THE SECURITIES ACT OF 1933

                              ZYCAD CORPORATION
        (Exact name of registrant as specified in its charter)

             Delaware                                       41-1404495 
     (State of Incorporation)                               
                                                           (I.R.S. Employer
                                                           Identification No.)
                                        
                          47100 Bayside Parkway
                            Fremont, CA  94538
                               510-623-4400
   
(Address and telephone number of Registrant's principal executive offices)


                           Phillips W. Smith
                Chairman and Chief Executive Officer 
                       47100 Bayside Parkway
                         Fremont, CA  94538
                           (510) 623-4480
                                
(Name, Address and telephone number of Agent for service)

                              Copies to:

Wilson, Sonsini, Goodrich & Rosati   Zycad Corporation
Professional Corporation             Douglas E. Klint, Esq.
Andrew J. Hirsch, Esq.               Vice President, Secretary & General Counsel
650 Page Mill Road                   47100 Bayside Parkway
Palo Alto, CA  94304-1050            Fremont, CA  94538

        (Agents to receive comments and other communications)

      (Name, address and telephone number of agents for service)

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC: As soon as 
practicable after this Registration Statement becomes effective.

   If the only securities being registered on this form are being offered 
pursuant to dividend or interest reinvestment plans, check the following box. 
  / /


<PAGE>

   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 this Form is filed to register additional securities for an offering 
pursuant to Rule 462(b) under the Securities Act, check the following box and 
list the Securities Act registration statement number of the earlier 
effective registration statement for the same offering.

   If this Form is a post-effective amendment filed pursuant to Rule 462(c) 
under the Securities Act, check the following box and list the Securities Act 
registration statement number of the earlier effective registration statement 
for the same offering. / /

   If delivery of the prospectus is expected to be made pursuant to Rule 434, 
check the following box.    / /

   
    

<PAGE>

  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 Commission, acting 
pursuant to said Section 8(a), may determine.



<PAGE>
                          ZYCAD CORPORATION
                                
                           3,970,000 Shares


                    Common Stock, par value $.10 per share

   This Prospectus relates to the resale by certain security holders named 
herein (the "Selling Securityholders") of up to 3,970,000 shares 
(the "Shares") of the Common Stock, par value $.10 per share (the 
"Common Stock") of Zycad Corporation, a Delaware corporation ("Zycad" or the 
"Company") which may be isused upon conversion of $10,000,000 aggregate 
principal amount of 6% Convertible Subordinated Debentures due 1999 (the 
"Debentures") or the exercise of the Stock Purchase Warrants (the "Warrants") 
issued in a private placement on May 24, 1996 (the "Offering"). See "Plan of 
Distribution". Information concerning the Selling Securityholders may change 
from time to time and will be set forth in Supplements to this Prospectus.  
Although the Company may receive up to $1,000,000 upon exercise of the 
Warrants, the Company will not receive any proceeds from the offering of the  
Shares.

   The Debentures are convertible at any time prior to maturity, unless 
previously redeemed or repurchased, into shares of Common Stock at a 
conversion price of 100% of the Market Price (the average of the lowest 
reported sales price of the Common Stock on each of the five trading days 
immediately preceding the conversion date) for the period May 24, 1996 
through August 22, 1996 (provided the Market Price is at least $6.00 per 
share); and 85% of the Market Price for the period August 23, 1996 through 
September 21, 1996 (with a maximum conversion of one third of the 
Debentures); and 84% of the Market Price for the period September 22, 1996 
through October 21, 1996 (with a maximum conversion of two thirds of the 
Debentures); and 83% of the Market Price for the period October 22, 1996 
through November 20, 1996 (with no limit on conversion); and 82% of the 
Market Price for the period November 21, 1996 through December 20, 1996; and 
81% of the Market Price for the period December 21, 1996 through January 19, 
1997; and 80% of the Market Price for the period January 20, 1997 through May 
24, 1999.  The Common Stock of the Company is traded on the Nasdaq National 
Market (symbol: "ZCAD").  On July 9, 1996, the lowest reported sale price of 
the Common Stock on the Nasdaq National Market was $5.125 per share.

   The Warrants are exercisable at any time beginning November 24, 1996 and 
ending November 24, 1998 for that number of Shares as is determined by 
dividing the Outstanding Principal Amount (as defined therein) of the Related 
Debenture (as defined therein) on November 24, 1996 by $100.00 at a purchase 
price per share of $10.00.

   Interest on the Debentures is payable semi-annually on May 20 and November 
20 of each year commencing on November 20, 1996.  The Debentures are not 
redeemable by the Company prior to May 24, 1997.  On or after May 24, 1997, 
the Debentures are redeemable, in whole or in part, at the option of the 
Company at a redemption price of 120%

                                       1
<PAGE>

   
of par value (principal plus accrued interest) for the period May 24, 1997 
through May 23, 1999. On May 24, 1999 (the maturity date) those Debentures 
that cannot be converted due to insufficient shares of Common Stock available 
for issuance upon conversion may be redeemed by the Company at a redemption 
price equal to 100% of the principal amount thereof, plus accrued interest.  
The Debentures are redeemable at the option of the holder upon the occurrence 
of an Event of Default (as defined) at 120% of the principal amount thereof, 
plus accrued interest or the market value of the Company's Common Stock which 
would be issuable upon conversion of such Debentures, whichever is higher.
    

   The Company has been advised by the Selling Securityholders 
that the Selling Securityholders, acting as principals for their own account, 
directly, through agents designated from time to time, or through brokers, 
dealers, agents or underwriters also to be designated, may sell all or a 
portion of the Shares which may be offered hereby by them from time to time 
on terms to be determined at the time of sale.  

   The aggregate proceeds to the Selling Securityholders from the sale of the 
Shares which may be offered hereby by the Selling Securityholders will be the 
purchase price of such Shares less commissions, if any. 

   The Selling Securityholders and any brokers, dealers, agents or 
underwriters that participate with the Selling Securityholders in the 
distribution of the Shares may be deemed to be "underwriters" within the 
meaning of the Securities Act, in which event any commissions received by 
such broker-dealers, agents or underwriters and any profit on the resale of 
the Shares may be deemed to be underwriting discounts under the Securities 
Act.

   The Company has agreed to bear certain expenses in connection with the 
registration of the Shares being offered by the Selling Securityholders.

   The Company intends that the Registration Statement of which this 
Prospectus is a part will remain effective until three years after the date 
of the  effectiveness of this Registration Statement or such earlier date as 
of which such Registration Statement is no longer required for the transfer 
of the subject securities.

   SEE "RISK FACTORS" BEGINNING ON PAGE 11 FOR A DISCUSSION OF CERTAIN 
FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE SECURITIES 
OFFERED HEREBY.

                                       2
<PAGE>
          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 JULY 12, 1996.

                                       3
<PAGE>
<TABLE>
<CAPTION>
                     TABLE OF CONTENTS                      PAGE
                                                             ---
<S>                                                           <C>
AVAILABLE  INFORMATION...................................      4

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE..........      4

THE COMPANY..............................................      6

RISK FACTORS.............................................      7

SELLING SECURITYHOLDERS..................................     14

LEGAL MATTERS............................................     17

EXPERTS..................................................     17

</TABLE>

   No person has been authorized to give any information or to make any 
representations other than those contained in this Prospectus in connection 
with the offering made hereby, and if given or made, such information or 
representations must not be relied upon as having been authorized by the 
Company or by any other person.  Neither the delivery of this Prospectus nor 
any sale made hereunder shall, under any circumstances, create any 
implication that information herein is correct as of any time subsequent to 
the date hereof.  This Prospectus does not constitute an offer to sell or a 
solicitation of an offer to buy any security other than the securities 
covered by this Prospectus, nor does it constitute an offer to or 
solicitation of any person in any jurisdiction in which such offer or 
solicitation may not lawfully be made.

                                       4

<PAGE>

                            AVAILABLE INFORMATION

   The Company is subject to the information and reporting requirements of 
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in 
accordance therewith files reports, proxy and information statements and 
other information with the Securities and Exchange Commission (the 
"Commission").  Such reports, proxy and information statements and other 
information can be inspected and copied at the offices of the Commission at 
Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, 
as well as the following regional offices of the Commission: Northwestern 
Atrium Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661; 
and Seven World Trade Center, Suite 1300, New York, New York 10048.  Copies 
of such material can also be obtained from the Public Reference Section of 
the Commission at 450 Fifth Street, N.W., Washington, D.C.  20549 at 
prescribed rates.  Such reports, proxy and information statements and other 
information concerning the Company may be inspected at the office of the 
National Association of Securities Dealers, Inc., 1735 K Street, N.W., 
Washington, D.C. 20006. The Commission maintains a World Wide Web site that 
contains reports, proxy and information statements and other information 
regarding registrants that file electronically with the Commission. The 
address of the site is http://www.sec.gov.


   This Prospectus does not contain all the information set forth in the 
Registration Statement on Form S-3 (the "Registration Statement") of which 
this Prospectus is a part, including exhibits relating thereto, which has 
been filed with the Commission under the Securities Act in Washington, D.C. 
Statements made in this Prospectus as to the contents of any referenced 
contract, agreement or other document are not necessarily complete, and each 
such statement shall be deemed qualified in its entirety by reference 
thereto.  Copies of the Registration Statement and the exhibits and schedules 
thereto may be obtained, upon payment of the fee prescribed by the 
Commission, or may be examined without charge, at the office of the 
Commission.

               INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The following documents have been filed by the Company with the Commission 
(File No. 13244) pursuant to the Exchange Act and are incorporated by 
reference in this Prospectus:

     (a)  The Company's Annual Report on Form 10-K for the year
     ended December 31, 1995, including the portions of the Company's Proxy
     Statement for its 1996 Annual Meeting of Stockholders incorporated by
     reference therein;
     
     (b)  The Company's Quarterly Report on Form 10-Q for the 
     quarter ended March 31, 1996;
     
     (c)  The Company's Current Report an Form 8-K dated May 24, 1996.
     
     (d)  The description of the Company's Common Stock offered for resale 
     hereby contained in the Company's Registration Statement on Form 8-A dated
     April 23, 1984, including any amendment or report filed for the purpose of
     updating such description.

     In addition, all reports and other documents subsequently 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 shall be deemed to be incorporated by reference in this Prospectus 
from the date of filing such documents.  Any statement contained in a 
document incorporated by reference herein shall be deemed to be modified

                                       5

<PAGE>
or superseded for purposes of this Prospectus to the extent that a 
statement contained herein or in any subsequently filed document that also is 
or is deemed to be incorporated by reference herein modifies or supersedes 
such statement.  Any such statement so modified or superseded shall not be 
deemed, except as to modified or superseded, to constitute a part of this 
Prospectus.  The Company will provide without charge to each person, 
including any beneficial owner, to whom this Prospectus is delivered, upon 
the written or oral request of such person, a copy of any and all of the 
documents that are incorporated herein by reference (other than exhibits to 
such documents, unless such exhibits are specifically incorporated by 
reference into such documents).  Requests for such documents should be 
directed to Douglas E. Klint, Vice President, Secretary and General Counsel 
at the principal executive offices of Zycad Corporation, 47100 Bayside 
Parkway, Fremont, CA  94538 or by telephone at (510) 623-4492.

THE COMPANY

   Zycad Corporation ("Zycad" or the "Company") designs, develops, 
manufactures, markets and supports high performance simulation accelerators 
and emulation/rapid prototyping systems which assist designers of integrated 
circuits (ICs) and IC-based  electronic systems verify the accuracy of their 
designs prior to committing these designs to silicon. Zycad's primary product 
emphasis has been simulation accelerators, which combine proprietary hardware 
design and simulation software to achieve faster simulation results than can 
be attained using software simulation tools operating on standard work 
station platforms. Since 1993, the Company has marketed emulation/rapid 
prototyping systems, which are proprietary  products based on field 
programmable gate array (FPGA) technology that also provide faster design 
verification results to electronic systems designers. In December 1995, Zycad 
completed its first beta-shipment of its own flash technology based 
high-density FPGA. These FPGA's, which are designed and developed by the 
Company's GateField division (GateField) and manufactured by a Japanese 
foundry, currently range in logic densities from 9,000 gates to 100,000 gates 
and are targeted for sale to custom and/or semi-custom IC designers for use 
both in design verification and as product components, in lieu of using 
application specific ICs (ASICs) in their products. Additionally, Zycad 
offers customers consulting engineering services to further assist them in 
more quickly completing and verifying their designs to get their products to 
market sooner.

   The Company markets it products and services to a broad range of customers 
who design electronic components, products and systems in a variety of 
electronics industries, including aerospace, computer, consumer electronics, 
multimedia, networking, semi-conductor and telecommunications. Customers 
include Intel, AMD, IBM, AT&T, Hughes, Siemens, Alcatel, Hitachi, Toshiba, 
NEC, and Hyundai.


   As IC manufacturing process technology continues to advance to deeper 
submicron technologies, the average IC design continues to increase in 
complexity and density; reaching over a million gates in many of today's 
designs. The traditional software simulation products operating on 
workstations are inadequate to provide the quick simulation and verification 
results needed to bring these complex designs to market faster. Zycad's 
accelerator products are designed specifically to meet the customer needs for 
faster simulation and verification results. The current LightSpeed simulation 
server product uses a

                                       6

<PAGE>
massively paralleled special purpose computer architecture, which 
incorporates proprietary simulation algorithms to rapidly complete the 
simulation tasks. The Company's accelerators operate in conjunction with Sun 
Microsystems and Hewlett-Packard workstations.

   The recent entry into the FPGA market is consistent with the Company's 
strategy to be the leading supplier of high performance design verification 
systems and extends that strategy to now offer customers the silicon to 
implement their designs and get their product to market faster than the 12 to 
16 week wait for foundries to complete these designs in ASICs. While other 
companies currently offer FPGA's, Zycad believes that its FPGA's will offer 
customers certain advantages, including methodology and gate capacity, that 
will allow it to successfully compete in this market.

   The Company, through one of its subsidiaries, Zycad International, 
acquired Attest Software, Inc. (Attest) effective June 1, 1996 for $2,400,000 
of the Company's common stock. Attest's products include a suite of 
testability analysis and test generation software tools that operate on 
workstations, including Sun Microsystems and Hewlett-Packard. These products 
are complimentary to Zycad's high performance fault simulation accelerators 
and expand the market coverage for fault simulation and test generation 
products.

   Zycad's products and services are sold primarily through its direct sales 
organization, which includes sales, application engineering and consulting 
engineering personnel. Distributors and manufacturers representatives are and 
will continue to be also used to market the Company's products. Zycad's uses 
third party manufacturing sources to assemble its accelerator product 
components and its FPGA products are produced by a foundry in Japan, with 
packaging and assembly done in the Philippines. However, final assembly and 
test for all products are performed at the Company's Fremont, California 
facilities. The Company was incorporated in Delaware in June 1981 and has its 
principal executive offices at 47100 Bayside Parkway, Fremont, California 
94538,  (510) 623-4400. Except as the context may otherwise require, the 
terms "Zycad" and the "Company" also include all subsidiaries.      

                                 RISK FACTORS
                                   
   The Common Stock offered by this Prospectus involves a high degree of 
risk. Where this Prospectus contains forward-looking statements within the 
meaning of Section 27A of the Securities Act and Section 21E of the Exchange 
Act, the actual results could differ materially from any projected in such 
forward-looking statements as a result of certain factors, including without 
limitation, the risk factors set forth below and elsewhere in this 
Prospectus.  In addition to the other information in this Prospectus, the 
following factors should be considered carefully in evaluating an investment 
in the shares of Common Stock offered by this Prospectus.

POTENTIAL FLUCTUATIONS IN QUARTERLY RESULTS

   The Company's quarterly operating results have in the past and may in the 
future vary significantly depending on factors including the timing of 
customer development projects and related purchase orders for the Company's 
simulation accelerators and FPGA
                                       7

<PAGE>
products, new product announcements and 
releases by the Company and its competitors, gain or loss of significant 
customers, price discounting of the Company's products, the timing of 
expenditures, customer product delivery requirements, availability and cost 
of components or labor and economic conditions, generally and in the 
electronics industry, specifically.  Any unfavorable change in these or other 
factors could have a material adverse effect on the Company's operating 
results for a particular quarter.  Many of the Company's customers order on 
an as-needed basis and often delay issuance of firm purchase orders until 
their design project reaches a development stage requiring the Company's 
products to accelerate design verification and completion.  As a result, the 
Company has in the past operated and expects to continue to operate with no 
significant backlog.  Quarterly revenue and operating results will therefore 
depend on the volume and timing of orders received during the quarter, which 
can be difficult to forecast accurately. Moreover, a significant portion of 
the Company's revenue in each quarter generally results from orders received 
and then shipped during the last few weeks of the quarter.  The absence of 
significant backlog and the concentration of sales at the end of the quarter 
limit the Company's ability to plan or adjust operating expenses and 
production and inventory levels.  Therefore, if anticipated shipments in any 
quarter do not occur or are delayed, expenditure levels could be 
disproportionately high as a percentage of revenue, and the Company's 
operating results for that quarter would be adversely affected.  In addition, 
revenues generated from individual systems with high sales prices can 
constitute a significant percentage of the Company's quarterly revenue.  
Operating results in any period should not be considered indicative of the 
results to be expected for any future period, and there can be no assurance 
that the Company's net revenues will increase, that its recent rate of 
quarterly revenue and earnings growth will be sustained, or that the Company 
will be profitable in any future period.

DEVELOPING MARKET; ACCEPTANCE OF THE cOMPANY'S PRODUCTS

   The Company began shipping commercial volumes of its PXP simulation 
accelerators in fiscal 1993.  Substantially all of the Company's product 
revenues (which constitute the majority of the Company's revenue) since 
fiscal 1993 have been derived from the sale of its PXP simulation 
accelerators.  The Company introduced its LightSpeed simulation accelerators 
in the second quarter of fiscal year 1996 with production shipments expected 
in third quarter of fiscal year 1996.  In addition the Company shipped its 
first Gatefield FPGA products in fourth quarter of fiscal year 1995 with 
limited production shipments expected in second quarter of fiscal year 1996.  
There can be no assurance that there will be market acceptance of these 
products.  The adoption of the Company's simulation accelerator products for 
the verification of IC and system designs is expected to depend on the 
continued increasing complexity of ICs designed for electronic systems, 
integration of the Company's products with other tools for IC design and 
simulation, the ability of hardware-assisted simulation accelerators to 
shorten the time of simulation of IC designs, the development  and market 
acceptance of design verification technologies such as cycle-based software 
simulation and FPGA-based emulation, and continuation of industry acceptance 
of the need for gate-level hardware-assisted simulation accelerators. In 
addition, the adoption of the Company's FPGA products is expected to depend 
on the increasing complexity of ASIC designs, the high costs of non-recurring 
engineering expenses and lengthy manufacturing process for ASICs, the ability 
of FPGA's  to shorten the time to market for ASIC designs, the integration of 
the Company's FPGA products with EDA

                                       8
<PAGE>
tools and methodologies, and the 
development and market acceptance of alternative prototyping systems. Because 
the market for hardware-assisted simulation products and FPGA's  is evolving, 
it is difficult to predict with any assurance whether the market for 
simulation accelerators or FPGA's  will continue to expand.  There can be no 
assurances that such market will expand or, even if such market expands, that 
the Company's products will achieve the market acceptance required to 
maintain revenue growth and profitability in the future.

COMPETITION

   The EDA and IC industries are highly competitive and rapidly changing.  
The Company's products are specifically targeted at a growing segment of the 
industry involving more complex designs that can benefit from using 
simulation methodology to verify their designs more quickly and/or FPGA's for 
either rapid prototyping verification purposes or for use in lieu of ASIC's 
as components with their product offering.  In each case the desired result 
is to introduce the product to the market in the shortest possible time.  To 
date, substantially all of the Company's product revenue has resulted from 
sales of simulation accelerators to this segment of the market.  The 
Company's competition currently comes from hardware-assisted simulation-based 
systems sold by IKOS Systems Inc. ("IKOS") and traditional software 
verification methodologies provided by EDA vendors such as Cadence Design 
Systems, Inc. ("Cadence") and Mentor Graphics Corporation ("Mentor 
Graphics"). In addition the Company faces competition from FPGA products sold 
by Xilinx Inc. ("Xilinx") and Altera Corporation ("Altera"), among others. As 
a result of the lack of  education and training by potential users of 
simulation accelerators and FPGA's on how to use them for "time to market" 
benefits, the Company must educate potential customers, thereby lengthening 
the sales cycle, in order for such customers to consider the Company's 
products for use within their EDA and IC design process.  The Company expects 
competition in the market for verification tools and for FPGA's to increase 
as other companies attempt to introduce new products and product 
enhancements.  Moreover, the Company competes, and expects that it will 
continue to compete, with established EDA and FPGA companies.  A number of 
these companies have longer operating histories, significantly greater 
financial, technical and marketing resources, greater name recognition and 
larger installed customer bases than the Company.  In addition, many of these 
competitors and potential competitors have established relationships with 
current and potential customers of the Company and offer a broader and more 
comprehensive product line.  Increased competition could result in price 
reductions, reduced margins and loss of market share, all of which could 
materially adversely affect the Company.  In addition, current competitors or 
other entities may develop other products that have significant advantages 
over the Company's products.  There can be no assurance that the Company will 
be able to compete successfully against current and future competitors or 
that competitive pressures faced by the Company will not materially adversely 
affect its operating results.  In the event the Company is unable to compete 
effectively with these or any other companies, the Company's business, 
financial condition or results of operations could be materially adversely 
affected.

                                       9
<PAGE>

NEW PRODUCTS AND TECHNOLOGICAL CHANGE

   The EDA and IC industry is characterized by extremely rapid technological 
change in both hardware, software and IC development, frequent new product 
introduction, evolving industry standards and changing customer requirements. 
 The introduction of products embodying new technologies and the emergence of 
new industry standards can render existing products obsolete and 
unmarketable.  The Company's future success will depend upon its ability to 
enhance its current series of simulation accelerators and FPGA products and 
to design, develop and support its next-generation products on a timely 
basis. Those efforts require continuing investment in research and 
development by the Company to address the increasingly sophisticated needs of 
the customers. There can be no assurance that the Company will be successful 
in developing and marketing product enhancements or new products that respond 
to technological change or evolving industry standards or changing customers 
requirements, that the Company will not experience difficulties that could 
delay or prevent the successful development, introduction and marketing of 
these products, or that its new products and product enhancements will 
adequately meet the requirements of the marketplace, will be of acceptable 
quality or will achieve market acceptance. Moreover, from time to time, the 
Company may announce new products or technologies that have the potential to 
replace the Company's existing product offerings.  There can be no assurance 
that the announcement of new product offerings will not cause customers to 
defer purchases of existing Company products, which could adversely affect 
the Company's results of operations.  

   In addition, technological advances or the development of new technologies 
could result in the introduction of competitive products with superior 
performance to and substantially lower prices than the Company's products.  
Further, the Company's new products and components are subject to significant 
technical risks.  If the Company experiences delays in the commencement of 
commercial shipments of new products or components, the Company could 
experience delays or loss of product sales.  If the Company is unable, for 
technological or other reasons, to develop and introduce new products in a 
timely manner in response to changing market conditions or customer 
requirements, the Company's business, operating results and financial 
condition would be materially adversely affected.

DEPENDENCE ON ELECTRONICS INDUSTRY

   The Company is dependent upon new system and IC design projects and 
volatility of the purchasing cycles in the electronics industry.  The 
volatility is characterized by rapid technological change, short product life 
cycles, fluctuations in manufacturing capacity and pricing and margin 
pressures.  As a result, the electronics industry has historically 
experienced sudden and unexpected downturns, at which time the number of new 
system and IC design projects decrease.  Because most of the Company's sales 
occur related to the commencement of new projects for system and IC products, 
the Company is dependent upon the rate of commencement of these design 
projects.  Accordingly, negative factors affecting the electronics industry 
could have a material adverse effect on the Company's results of operations.

                                      10
<PAGE>
DEPENDENCE UPON CERTAIN SUPPLIERS

   Certain key components used in the Company's products are presently 
available from sole or limited sources.  The inability to develop alternative 
sources for these sole or limited source components or to obtain sufficient 
quantities of these components could result in delays or reductions in 
product shipments which could adversely affect the Company's operating 
results.  The Company's simulation accelerators use proprietary ASICs that 
are currently manufactured by LSI Logic, Inc. ("LSI") and subassemblies and 
components that are provided by other third party manufacturers.  In addition 
the Company's FPGA's are manufactured by ROHM, a foundry located in Kyoto, 
Japan and packaged by Anam located in the Philippines.

CURRENT RISK

   The Company generally purchases these components, including semiconductor 
memories used in the Company's simulation accelerators, pursuant to purchase 
orders placed from time to time in the ordinary course of business and has no 
long-term supply arrangements with any of these source suppliers that require 
the suppliers to provide components in guaranteed quantities or at set 
prices.  Moreover, the manufacture of these components can be extremely 
complex, and the Company's reliance on the suppliers of these components 
exposes the Company to production difficulties and quality variations that 
may be experienced by these suppliers.  Therefore, the Company's reliance on 
its sole and limited source suppliers involves several risks, including a 
potential inability to obtain an adequate supply of required components, 
reduced control over pricing and timely delivery and quality of acceptable 
components.  While the timeliness and quality of deliveries to date from such 
suppliers have been acceptable, there can be no assurance that problems will 
not occur in the future.  Any prolonged inability to obtain components or 
subassemblies in sufficient quantities or quality or on favorable pricing or 
delivery terms, or any other circumstances that would require the Company to 
seek alternative sources of supply, could have a material adverse effect on 
the Company's operating results and could damage the Company's relationships 
with its customers.

CUSTOMER CONCENTRATION

   A relatively limited number of customers have historically accounted for a 
substantial portion of the Company's net revenues.  For the three months 
ended March 31, 1996, and in fiscal 1995, sales to the Company's top five 
customers accounted for approximately 60% and 33% respectively, of the 
Company's net revenues. The Company expects that sales of its products to a 
limited number of customers will continue to account for a high percentage of 
net revenues for the foreseeable future.  The loss of a major customer or any 
reduction in orders by such customers, including reductions due to market or 
competitive conditions in the electronics, IC or EDA industry, would have an 
adverse effect on the Company's results of operations.  Moreover, the 
Company's ability to increase its sales will depend in part upon its ability 
to obtain orders from new customers, as well as the financial condition and 
success of its existing customers and the general economy; there can be no 
assurance that such increases will occur.

                                      11

<PAGE>

LENGTHY SALES CYCLE

   Sales of the Company's products depend, in significant part, upon the 
commencement of and schedule adherence to projects for the design and 
development of complex ICs and systems.  In view of the significant amount of 
time and commitment of capital involved, the Company may experience delays in 
product shipment sales following initial qualification of the Company's 
systems due to delays in commencement of the project or schedule shippage by 
a customer.  For this and other reasons, the Company's products typically 
have a lengthy sales cycle during which the Company may expend substantial 
funds and management effort.  Lengthy sales cycles subject the Company to a 
number of significant risks, including fluctuations in operating results, 
over which the Company has little or no control.

PROPRIETARY RIGHTS

   The Company's success and ability to compete is dependent in part upon its 
proprietary technology.  The Company relies on patent, trademark, trade 
secret and copyright law to protect its technology.  The Company currently 
holds five U.S. patents. However, there can be no assurance that any patent 
owned by the Company will not be invalidated, circumvented or challenged, 
that the right granted thereunder will provide competitive advantages to the 
Company or that any of the Company's future patent applications, whether or 
not challenged by applicable governmental patent examiners, will be issued 
with the scope of the claims sought by the Company, if at all.  Furthermore, 
there can be no assurance that others will not develop technologies that are 
similar or superior to the Company's technology, duplicate the Company's 
technology or design around the patents owned by the Company.  The Company 
generally enters into confidentiality or license agreements with its 
employees, distributors and customers, and limits access to and distribution 
of its software, documentation and other proprietary information.  Despite 
these precautions, it may be possible for a third party to copy or otherwise 
obtain and use the Company's products or technology without authorization or 
to develop similar technology independently.  In addition, effective 
copyright and trade secret protection may be unavailable or limited in 
certain foreign countries.

   Although none presently exist, from time to time the Company has received, 
and may receive in the future, notice of claims of infringement or potential 
infringement of other parties' proprietary rights.  Although the Company 
does not believe that its products infringe the proprietary rights of any 
third parties, there can be no assurance that infringement or invalidity 
claims (or claims for indemnification resulting from infringement claims) 
will not be asserted against the Company or that any such assertions will not 
materially adversely affect the Company' business, financial condition or 
results of operations.  Irrespective of the validity or the successful 
assertion of such claims, the Company could incur significant costs with 
respect to the defense thereof which could have a material adverse effect on 
the Company's business, financial condition or results of operations.  If any 
claims or actions are asserted against the Company, the Company may seek to 
obtain a license under a third party's intellectual property rights.  There 
can be no assurance, however, that under such circumstances, a license would 
be available under reasonable terms or at all.

                                      12

<PAGE>

   The Company also relies on certain software which it licenses from third 
parties, including software which is integrated with internally developed 
software and used in the Company's products to perform key functions.  There 
can be no assurance that these third party software licenses will continue to 
be available to the Company on commercially reasonable terms or otherwise.  
The loss of or inability to maintain any of these software licenses could 
result in delays or reductions in product shipments until equivalent software 
could be identified, licensed and integrated, which would adversely affect 
the Company's operating results.

INTERNATIONAL SALES

   International sales accounted for approximately 67% and 53% of the 
Company's net revenues for the three month periods ended March 31, 1996 and 
March 31, 1995, respectively, and 30%, 26% and 29% of the Company's net 
revenues in fiscal 1995, 1994 and 1993, respectively.  The Company expects 
that international sales will continue to account for a significant portion 
of its revenues, and plans to continue to expand its international sales and 
distribution channels.  These revenues involve a number of inherent risks, 
including traditionally slower adoption of the Company's products 
internationally, the impact of recessionary environments in economies outside 
the United States, generally longer receivable collection periods, unexpected 
changes in or impositions of legislative or regulatory requirements, reduced 
protection for intellectual property rights in some countries, potentially 
adverse taxes, delays resulting from difficulty in obtaining export licenses 
for certain technology and other trade barriers.  There can be no assurance 
that such factors will not have a material adverse effect on the Company's 
future international sales and, consequently, on the Company's results of 
operations. Currency exchange fluctuations in countries in which the Company 
sells its systems could have a material adverse effect on the Company by 
resulting in pricing that is not competitive with prices denominated in local 
currencies.

DEPENDENCE UPON KEY PERSONNEL

   The Company's future performance depends in significant part upon 
attracting and retaining key technical, sales, senior management and 
financial personnel. Competition for such personnel is intense, and the 
inability to retain its key personnel or to attract, assimilate or retain 
other highly qualified personnel in the future on a timely basis could have a 
material adverse effect on the Company's results of operations.  In 
particular, there are only a limited number of qualified EDA, IC design and 
test engineers, and the competition for such individuals is especially 
intense.  In addition, the Company's ability to compete effectively and to 
manage future growth, if any, will require the Company to continue to retain 
and manage its employee workforce.  There can be no assurance that the 
Company will be able to do so successfully.  The Company' failure to do so 
could have a materially adverse effect upon the Company's results of 
operations.

GATEFIELD NEW BUSINESS RISK

   The GateField FPGA Products represent the start of a new and different 
business by the Company.  In addition to all of the previously mentioned 
risks, there is the additional risk associated with starting this new FPGA 
business in a different  market with different

                                      13


<PAGE>

manufacturing, marketing and distribution channels. The GateField division 
was established in August 1993 and from that date to the present, GateField 
has been in a research and development mode of operation.  It has now 
completed the design of a 100,000 gate family of products for production in 
 .8 micron process technology.  With the R&D and manufacturability phases 
complete the Company is now beginning to market its products.  The risks 
previously identified in this section are magnified in relation to GateField 
as the Company has had no prior experience in marketing FPGA's.  The current 
FPGA market leaders include Xilinx, Altera, Actel Corporation ("Actel") and 
AT&T Corporation ("AT&T").  These companies use manufacturing process 
technologies that are more advanced than the .8 micron technology that 
GateField is currently using and they have well established distribution 
channels and excellent reputations.  These companies have comparable products 
with similar densities and, in some instances, faster performance. The 
Company's ability to effectively compete with these established FPGA 
companies is dependent upon the Company's ability to move quickly to the more 
advanced process technologies and to establish distribution channels to 
market its products. Currently, GateField is dependent upon Zycad's 
accelerator business to finance its successful product introduction. Any 
deterioration in the financial results of the Company's accelerator business 
could adversely affect the GateField business.

RISKS ASSOCIATED WITH INTERNATIONAL BUSINESS ACTIVITIES

   International revenues have accounted for a significant portion of the 
Company's net revenues in the past, and Zycad believes that international 
revenues will continue to account for a significant portion of net revenues.  
The Company's success will depend in part upon its ability to manage 
international marketing and sales operations and manufacturing relationships. 
 In addition, Zycad purchases a substantial portion of its FPGA parts from 
foreign suppliers.  Zycad's international manufacturing and sales are subject 
to changes in foreign political and economic conditions and to other risks 
including currency or export/import controls and changes in tax laws, tariffs 
and freight rates.  In addition, the Company sells certain of its products in 
international markets and buys certain products in international markets in 
currencies other than the U.S. dollar, and the Company does not currently 
hedge its exposure to foreign currency fluctuations.  As a result, currency 
fluctuations could have a material adverse effect on the Company's business 
and results of operations.  With respect to international sales that are 
denominated in U.S. dollars, increases in the value of the U.S. dollar 
relative to foreign currencies can increase the effective price of and reduce 
demand for the Company's products relative to competitive products priced in 
the local currency.  The United States has considered trade sanctions against 
Japan.  If trade sanctions were imposed, Japan could enact trade sanctions in 
response.  Because a number of the Company's current and prospective 
customers and suppliers are located in Japan, trade sanctions, if imposed, 
could have a material adverse effect on Zycad's business and results of 
operations.  Similarly, protectionist trade legislation in either the United 
States or foreign countries could have a material adverse effect on the 
Company's ability to manufacture or to sell its products in foreign markets.

                                      14


<PAGE>


POSSIBLE VOLATILITY OF STOCK PRICE

   The market price of the Company's Common Stock has been, and is likely to 
continue to be, highly volatile.  Future announcements concerning the Company 
or its competitors, quarterly variations in operating results, announcements 
of technological innovations, the introduction of new products or changes in 
product pricing policies by the Company or its competitors, proprietary 
rights or other litigation, changes in earnings estimates by analysts or 
other factors could cause the market price of the Common Stock to fluctuate 
substantially.  In addition, the stock market has from time-to-time 
experienced significant price and volume fluctuations that have particularly 
affected the market prices for the common stocks of technology companies and 
that have often been unrelated to the operating performance of particular 
companies.  These broad market fluctuations may also adversely affect the 
market price of the Company's Common Stock.  In the past, following periods 
of volatility in the market price of a company's securities, securities class 
action litigation has occurred against the issuing company.  There can be no 
assurance that such litigation will not occur in the future with respect to 
the Company.  Such litigation could result in substantial costs and a 
diversion of management's attention and resources, which could have a 
material adverse effect on the Company's  business, financial condition and 
results of operations.  Any adverse determination in such litigation could 
also subject the Company to significant liabilities.


                                      15


<PAGE>

                    SELLING SECURITYHOLDERS

   The Debentures were issued by the Company on May 24, 1996 pursuant to 
Subscription Agreements dated May 23, 1996, and, were acquired by the Selling 
Securityholders.  The following table sets forth information concerning 
the number of, shares of Common Stock issuable upon conversion of the 
Debentures (the "Conversion Shares") which may be offered from time to time 
pursuant to this Prospectus.  Other than their ownership of Company 
securities, none of the Selling Securityholders has had any material 
relationship with the Company within the past three years.

<TABLE>
<CAPTION>
                         MAXIMUM
                         NUMBER OF
                         CONVERSION
                          SHARES
                         THAT MAY
                        BE SOLD(1)(2)
                       --------------
<S>                     <C>          
Halifax Fund L.P.       1,985,000

Capital Ventures        1,985,000
International

</TABLE>

                                      16


<PAGE>

(1)     The information set forth herein is as of July 9, 1996 and will       
        be updated as required.

(2)     This number includes the maximum number of such additional 
        indeterminate number of shares   as may be issuable upon conversion by 
        reason of adjustments and fluctuations of the conversion price and 
        assumes conversion of the  full amount of Debentures held by such 
        holder at a rate of $2.52 in principal amount of Debentures per share 
        of Common Stock. The last reported sale on the Nasdaq National Market 
        on July 9, 1996 was $5.125 per share. At a conversion rate of $5.125 
        per share, the  Debentures held by each Selling Shareholder would be 
        converted into 975,609 shares each. Under the terms of the Debenture,
        fractional shares will not be issued upon conversion of the Debentures;
        cash will be paid in lieu of fractional shares, if any. 

   The information concerning the Selling Securityholders may change from 
time to time and will be set forth in Supplements to this Prospectus.  In 
addition, the per share conversion price and, therefore, the number of Shares 
issuable upon conversion of the Debentures is subject to adjustment under 
certain circumstances. Accordingly, the aggregate principal amount of 
Debentures and the number of Shares issuable upon conversion of the 
Debentures may increase or decrease. As of the date of this Prospectus, the 
aggregate principal amount of Debentures outstanding is $10,000,000 which may 
be converted into 1,951,219 Shares assuming a conversion price of $5.125 per 
share.  The maximum number of Shares reserved for issuance is 3,970,000 
including up to 100,000 shares reserved for exercise of the Warrants.

   The Company and the Selling Securityholders have agreed to indemnify each 
other against certain liabilities arising under the Subscription Agreement.  
The Company has agreed to pay all expenses incident to the registration of 
the offer and sale of the shares of Common Stock to the public pursuant to 
this Prospectus other than selling commissions and fees.

   Because the Selling Securityholders may offer all or some of the Shares 
pursuant to the offering contemplated by this Prospectus, and to the 
Company's knowledge there are currently no agreements, arrangements or 
understandings with respect to the sale of any of the Shares that may be held 
by the Selling Securityholders after completion of this offering, no estimate 
can be given as to the principal amount of Shares that will be held by the 
Selling Securityholders after completion of this offering.  See "Plan of 
Distribution."

PLAN OF DISTRIBUTION

   This Prospectus relates to the resale of up to 3,970,000 Shares 
which may become issuable upon conversion of Debentures 

   The Company will not receive any of the proceeds from the offering of the 
shares of Common Stock issuable upon conversion thereof by the Selling 
Securityholders and which are sold pursuant to the Registration Statement (of 
which this Prospectus is a part).   The Company has been advised by the 
Selling Securityholders that the Selling Securityholders

                                      17


<PAGE>

may sell all or a portion of the shares of Common Stock beneficially owned by 
them and which my be offered hereby from time to time on any exchange or 
market an which the securities are listed or quoted, as applicable, on terms 
to be determined at the times of such sales.  The Selling Securityholders may 
also make private sales directly or through a broker or brokers.  
Alternatively, any of the Selling Securityholders may from time to time offer 
the  shares of Common Stock which may be offered hereby and beneficially 
owned by them through underwriters, deniers or agents, who may receive 
compensation in the form of underwriting discounts, commissions or 
concessions from the Selling Securityholders and the purchasers of the 
Debentures of shares of Common Stock for whom they may act as agent.

   To the extent required, the number of shares of Common Stock to be offered 
hereby, the names of the Selling Securityholders, the purchase price, the 
name of any such agent, dealer or underwriter and any applicable commissions, 
discounts or other terms constituting compensation with respect to a 
particular offer will be set forth in an accompanying Prospectus Supplement.  
The aggregate proceeds to the Selling Securityholders from the sale of the 
Shares offered by them hereby will be the purchase price of such Shares less 
discounts and commissions, if any.

   The shares of Common Stock which may be offered hereby may be sold from 
time to time in one or more transactions at fixed offering prices, which may 
be changed, or at varying prices determined at the time of sale or at 
negotiated prices.  Such prices will be determined by the holders of such 
securities or by agreement between such holders and underwriters or dealers 
who may receive fees of commissions in connection therewith.

   The outstanding Common Stock is listed for trading on the Nasdaq National 
Market, and the shares of Common Stock issuable upon conversion of the 
Debentures have been authorized for listing on the NASDAQ upon official 
notice of issuance.

   In order to comply with the securities laws of certain states, if 
applicable, the Debentures and shares of Common Stock offered hereby will be 
sold in such jurisdictions only through registered or licensed brokers or 
dealers.  In addition, in certain states the Debentures and shares of Common 
Stock offered hereby may not be sold unless they have been registered or 
qualified for sale in the applicable state or an exemption from the 
registration or qualification requirement is available and compliance with 
same is effected.

   The Selling Securityholders and any broker-dealers, agents or underwriters 
that participate with the Selling Securityholders in the distribution of the 
Debentures of shares of Common Stock offered hereby may be deemed to be 
"underwriters" within the meaning of the Securities Act, in which event any 
commissions or discounts received by such broker-dealers, agents or 
underwriters and any profit on the resale of the Debentures or shares of 
Common Stock offered hereby and purchased by them may be deemed to be 
underwriting commissions or discounts under the Securities Act.


                                      18

<PAGE>

LEGAL MATTERS

   The validity of the Common Stock has been passed upon for the Company 
by Wilson, Sonsini, Goodrich & Rosati, Professional Corporation, Palo Alto, 
California.

EXPERTS

   The financial statements and the related financial statement schedule 
incorporated in this prospectus by reference from the Company's Annual Report 
on Form 10-K for the year ended December 31, 1995 have been audited by 
Deloitte & Touche LLP, independent auditors, as stated in their reports, 
which are incorporated herein by reference, and have been so incorporated in 
reliance upon the reports of such firm given upon their authority as experts 
in accounting and auditing.

                                      19

<PAGE>

                            PART II

             INFORMATION NOT REQUIRED IN PROSPECTUS

     ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

             The following table sets forth an itemized statement of all      
     estimated expenses in connection with the issuance and distribution      
     of the securities being registered:

<TABLE>

         <S>                                      <C> 
         SEC registration fee                     $ 7,016
         Legal expenses                             5,000
         Accounting fees and expenses               5,000
         Miscellaneous                                500
                                                 -------- 
         Total                                    $17,516

</TABLE>

ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

   Section 145 of the Delaware General Corporation Law, under which law 
Registrant is incorporated, grants corporations the power to indemnify their 
directors, officers, employees and agents in accordance with the provisions 
therein set forth.  The provisions governing the indemnification by 
Registrant of its directors, officers, employees and agents are set forth in 
Section Ten of Registrant's Restated Certificate of incorporation.

   Article Ten provides as follows:

   No Director of the Corporation shall be personally liable to the 
Corporation or its stockholders for monetary damages for breach of fiduciary 
duty by such Director as a Director, provided, however, that this Article 10 
shall not eliminate or limit the liability of a Director to the extent 
provided by applicable law (I) for any breach of the Director's duty of 
loyalty to the Corporation or its stockholders, (ii) for acts or omissions 
not in good faith or which involve intentional misconduct or a knowing 
violation of law; (iii) under Section 174

                                    II-1

<PAGE>

of the General Corporation Law of the State of Delaware, or (iv) for any 
transaction from which the Director derived an improper personal benefit.  No 
amendment to or repeal of this Article 10 shall apply to or have any effect 
on the liability or alleged liability of any Director of the Corporation for 
or with respect to any acts or omissions of such Director occurring prior to 
such amendment or repeal.

   Registrant maintains and pays the premium on contracts insuring Registrant 
(with certain exclusions) against any liability to directors and officers it 
may incur under the above indemnity provisions and insuring each director and 
officer of Registrant (with certain exclusions) against liability and 
expense, including legal fees, which he may incur by reason of his 
relationship to Registrant, even if Registrant does not have the obligation 
or right to indemnify him against such liability or expense.

ITEM 16.  EXHIBITS

   
<TABLE>

   <S>     <C>  
   5.1*    Opinion of Wilson, Sonsini, Goodrich & Rosati, Professional 
           Corporation, as to legality of securities being registered.

  23.1*    Consent of Counsel (contained in Exhibit 5.1 hereto).

  23.2     Consent of Deloitte & Touche L.L.P., independent auditors.

  24.1*    Power of Attorney

</TABLE>
    

   
- ---------------
* Previously filed.
    

ITEM 17. UNDERTAKINGS.


   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:

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

      (b) to reflect in the prospectus any facts or events arising after the 
   effective date of this Registration Statement (or the most recent 
   post-effective amendment hereof) which, individually or in the aggregate, 
   represent a fundamental change in the information set forth in this 
   Registration Statement. Notwithstanding the foregoing, any increase or 
   decrease in volume of securities offered (if the total dollar 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.

      (c) to include any material information with respect to the plan of 
   distribution not previously disclosed in this Registration Statement or any 
   material change to such information in this Registration Statement.

provided, however, that the undertakings set forth in paragraph (a) and (b) 
above shall not apply if the information required to be included in a 
post-effective amendment by those paragraphs is contained in periodic reports 
filed by the Registrant pursuant to Section 13 or 15(d) of the Securities 
Exchange Act of 1934 (the "Exchange Act") that are incorporated by reference 
in this 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.


                                    II-2

<PAGE>

   Insofar as indemnification for liabilities arising under the Securities 
Act of 1933 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 Securities Act of 1933 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 Securities Act of 1933 and will be 
governed by the final adjudication of such issue.

   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 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.

   For purposes of determining any liability under the Securities Act of 
1933, the information omitted from the form of prospectus filed as part of 
this Registration Statement in reliance upon Rule 430A and contained in a 
form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) 
or 497(h) under the Securities Act of 1933 shall be deemed to be part of this 
Registration Statement as of the time it was declared effective. For the 
purpose of determining any liability under the Securities Act of 1933, each 
post-effective that contains a form of  prospectus  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.

SIGNATURES

   
   Pursuant to the requirements of the Securities Act of 1933, the registrant 
certifies that it has reasonable grounds to believe that it meets all of the 
requirements for filing this Amendment No. 1 to Form S-3 and has duty caused 
this Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Fremont, State of California on 
this 31st day of July, 1996.
    

                      ZYCAD CORPORATION

                      By:  /s/ Phillips W. Smith.                       
                         -------------------------------
                            Phillips W. Smith,  
                            President and 
                            Chief Executive Officer


                                    II-3

<PAGE>

   
Pursuant to the requirements of the Securities Act of 1933, this Amendment 
No. 1 to the Registration Statement has been signed by the following persons 
in the capacities and on the dates indicated. 
    

   
<TABLE>
<CAPTION>
<S>                         <C>                              <C>       
 SIGNATURE                  TITLE                             DATE         
 ---------                  -----                             ----
  
 /s/ Phillips W. Smith       President, and                  July 31, 1996 
- ------------------------     Chief Executive Officer            
     Phillips W. Smith       (principal executive officer)   
                             and Director


  /s/ Peter J. Cassidy       Exec. VP, CFO                   July 31, 1996 
  ------------------------   and Director
      Peter J. Cassidy       (principal accounting officer)

  /s/       *                President, GateField            July 31, 1996 
  ------------------------   Division and Director     
      Horst G. Sandfort

  /s/       *                Director                        July 31, 1996 
  ------------------------    
      Benjamin Huberman

  /s/       *                Director                        July 31, 1996 
  --------------------------  
      James R. Fiebiger

*By: /s/ Phillips W. Smith
    -----------------------------------
    Phillips W. Smith, Attorney-in-Fact

</TABLE>
    



<PAGE>


                               ZYCAD CORPORATION

                       REGISTRATION STATEMENT ON FORM S-3

                                 INDEX TO EXHIBITS

   
                                                             SEQUENTIALLY
EXHIBIT                                                          NUMBERED
NUMBER                                                               PAGE


5.1*   Opinion of Wilson, Sonsini, Goodrich & Rosati,
       Professional Corporation, as to legality of 
       securities being registered.

23.1*  Consent of Counsel (contained in Exhibit 5.1
       hereto).

23.2   Consent of Deloitte & Touche L.L.P., independent
       auditors.

24.1*  Power of Attorney (see page II-4)


- ------------------
* Previously filed
    


<PAGE>


                                           Exhibit 23.2



                           INDEPENDENT AUDITORS' CONSENT

   
      We consent to the incorporation by reference in this Amendment No. 1 to 
Registration Statement No. 333-08089 of Zycad Corporation on Form S-3 of our 
reports dated March 27, 1996 appearing in and incorporated by reference in 
the Annual Report on Form 10-K of Zycad Corporation for the year ended 
December 31, 1995 and to the reference to us under the heading "Experts" in 
the Prospectus, which is part of this Registration Statement.
    

DELOITTE & TOUCHE LLP
San Jose, California


   
August 1, 1996
    


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