ZYCAD CORP
S-3, 1997-05-16
ELECTRONIC COMPUTERS
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<PAGE>
As filed with the Securities and Exchange Commission on May 16, 1997 
                                                 Registration No. 333-_____

                   UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549
                                           
                                       FORM S-3
               REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                           
                                  ZYCAD CORPORATION
                                  -----------------
                (Exact name of registrant as specified in its charter)
                                           
                                       DELAWARE                      
            (State or other jurisdiction of incorporation or organization)
                                           
                                      41-1404495
                          (I.R.S. Employer Identification No)
                                           
                                47100 BAYSIDE PARKWAY
                                  FREMONT, CA 94538
                                    (510) 623-4400
(Address, including zip code, and telephone number, including area code, of
registrant's principal executive offices)
                                           
                                  PHILLIPS W. SMITH
                        PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                  ZYCAD CORPORATION
                                47100 BAYSIDE PARKWAY
                                  FREMONT, CA 94538
                                    (510) 623-4400
(Name, address, including zip code, and telephone number, including area code,
of agent for service)
                                           
                                      Copies to:
                                           
            ANDREW J. HIRSCH, ESQ.               DOUGLAS E. KLINT, ESQ.
       Wilson Sonsini Goodrich & Rosati       Vice President and General Counsel
           Professional Corporation                 Zycad Corporation
              650 Page Mill Road                   47100 Bayside Parkway
           Palo Alto, California 94304           Fremont, California 94538
                (415) 493-9300                       (510) 623-4400
                                           
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                                           

         If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box: [  ]

         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, please check the
following box and list the Securities Act registration 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 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, please check the following box. [  ]

<PAGE>


                           CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
                                                            PROPOSED           PROPOSED 
     TITLE OF  EACH CLASS OF                                MAXIMUM             MAXIMUM
   SECURITIES TO BE REGISTERED         AMOUNT TO            OFFERING      AGGREGATE OFFERING      AMOUNT OF
                                   BE REGISTERED (1)   PRICE PER SHARE(2)      PRICE(3)       REGISTRATION FEE
- --------------------------------------------------------------------------------------------------------------
 <S>                              <C>                  <C>                <C>                 <C>
 Common Stock, $0.10 par value    6,044,680 shares          $0.84375          $5,100,199           $1,546
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
</TABLE>
(1) This Registration Statement relates to the resale of the number of shares
    of Common Stock required to be issued upon (i) conversion of Registrant's
    issued and outstanding Series A-1 Convertible Preferred Stock, Series A-2
    Convertible Preferred Stock, Series A-3 Convertible Preferred Stock, Series
    A-4 Convertible Preferred Stock  and Series A-5 Convertible Preferred Stock 
    (collectively, the "Preferred Stock") into Common Stock, (ii) conversion of
    Preferred Stock issued upon exercise of Registrant's Preferred Stock
    Purchase Warrants ("Preferred Warrants"), and (iii) exercise of
    Registrant's Common Stock Purchase Warrants ("Common Warrants").  The
    number of shares issuable upon conversion of the Preferred Stock and
    exercise of the Common Warrants is initially limited to 5,044,680 shares
    (although 6,044,680 have been reserved for issuance) unless the Company
    obtains shareholder approval of the issuance of additional shares of Common
    Stock upon conversion of the Preferred Stock.  Because of the possibility
    of antidilution adjustments to the conversion price of the Preferred Stock
    (which is based on the market price of the Common Stock), the number of
    shares of Common Stock issuable upon such conversion or exercise and
    subject to this Registration Statement is indeterminate and this
    Registration Statement relates to the resale of such entire indeterminate
    number of shares of Common Stock.
(2) Based upon a last reported sale on the Nasdaq National Market on May 9,
    1997 of $0.84375 per share; the actual offering price may be higher or
    lower depending on the market price of the Common Stock from time to time.
(3) Assumes 5,044,680 shares are issued pursuant to the conversion of the
    Preferred Stock into Common Stock and exercise of Common Warrants to
    purchase 500,000 shares of Common Stock at $2.25 per share.  The aggregate
    unconverted Stated Value of the issued and outstanding Preferred Stock was
    $3,500,000 on May 15, 1997.  Based upon a last reported sale on the Nasdaq
    National Market on May 9, 1997 of $0.84375 per share, the actual number of
    shares of Common Stock which would be issuable on May 15, 1997, upon
    conversion of the issued and outstanding shares of Preferred Stock,
    conversion of the Preferred Stock issuable upon exercise of the Preferred
    Warrants and exercise of the Common Warrants would have been 7,639,670
    shares.

    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 such Section 8(a),
may determine.

                                         (ii)


<PAGE>
                                           
                       SUBJECT TO COMPLETION DATED MAY 16, 1997
                                           
                                  ZYCAD CORPORATION
                                           
                                   5,044,680 SHARES
                                           
                       COMMON STOCK, PAR VALUE $0.10 PER SHARE
                                           
This Prospectus relates to the resale by certain security holders named 
herein (the "Selling Securityholders") of (i) up to 5,044,680 shares of the 
Common Stock, par value $0.10 per share (the "Common Stock") of Zycad 
Corporation, a Delaware corporation ("Zycad" or the "Company") which may be 
issued upon conversion of $3,500,000 in aggregate stated value (the "Stated 
Value") of the Company's Series A-1 Convertible Preferred Stock, Series A-2 
Convertible Preferred Stock, Series A-3 Convertible Preferred Stock, Series 
A-4 Convertible Preferred Stock  and Series A-5 Convertible Preferred Stock 
(collectively, the "Preferred Stock"),  (ii) conversion of Preferred Stock 
issued upon exercise of Registrant's Preferred Stock Purchase Warrants 
("Preferred Warrants") to purchase  42,858 shares of Preferred Stock, and 
(iii) the exercise of Common Stock Purchase Warrants (the "Common Warrants") 
to purchase 500,000 shares of the Company's Common Stock.   The number of 
shares issuable upon conversion of the Preferred Stock (including that 
issuable upon exercise of the Preferred Warrants) and exercise of the Common 
Warrants is initially limited to 5,044,680 shares unless the Company obtains 
shareholder approval of the issuance of additional shares of Common Stock 
upon conversion of the Preferred Stock. Because of the possibility of 
antidilution adjustments to the conversion price of the Preferred Stock 
(which is based on the market price of the Common Stock), the number of 
shares of Common Stock issuable upon such conversion or exercise and subject 
to this Prospectus is indeterminate and this Prospectus relates to the resale 
of such entire indeterminate number of shares of Common Stock. The Company 
closed a private placement of $3,500,000 in aggregate principal amount of 6% 
Subordinated Convertible Debentures Due 2000 (the "Debentures") and the 
Common Warrants on February 13, 1997.  On May 15, 1997, the Debentures were 
exchanged with the holders thereof for one share of  Preferred Stock and the 
right to purchase pursuant to the Preferred Warrants 0.42858 shares of 
Preferred Stock for each $35.00 in aggregate principal amount of the 
Debentures.  The Preferred Stock is convertible into shares of Common Stock 
(the "Shares") as described below.  The aggregate unconverted Stated Value of 
the issued and outstanding Preferred Stock was $3,500,000 on May 15, 1997, 
and an additional $52,356 of accrued premium  was also available for 
conversion as of such date.  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 approximately $1,125,000 upon exercise of the Common Warrants and 
$1,500,030 upon exercise of the Preferred Warrants, the Company will not 
receive any proceeds from the offering of the Shares.

The Preferred Stock is convertible at the option of the holder at any time prior
to maturity, unless previously redeemed or repurchased, into the Shares at 83%
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 15, 1997 through June 13, 1997; 82% of the
Market Price for the period June 14, 1997 through July 13, 1997; 81% of the
Market Price for the period July 14, 1997 through August 12, 1997; 80% of the
Market Price for the period August 13, 1997 through September 11, 1997; 79% of
the Market Price for the period September 12, 1997 through October 11, 1997; and
78% of the Market Price for the period October 12, 1997 through February 13,
2000.  Each percentage set forth in the previous sentence will be reduced by
three percentage points (on a pro-rated basis for each day during such period
until effectiveness), if the effective date of the registration statement of
which this Prospectus is a part occurs after May 16, 1997 and prior to June 14,
1997;  by up to an additional three percentage points  (on a pro-rated basis for
each day during such period until effectiveness), if the effective date of such
registration statement occurs on or after June 14, 1997, and prior to July 14,
1997;  by up to an additional three percentage points (on a pro-rated basis for
each day during such period until effectiveness) if the effective date occurs on
or after July 14, 1997, and prior to August 12, 1997.  If  the registration
statement has not become effective prior to July 14, 1997, the Company shall
make a cash payment to each holder of Preferred Stock for each day after July
14, 1997, and prior to August 13, 1997, that the registration statement is not
effective equal to one-thirtieth of three percent (3%) of the Stated Value of
the Preferred Stock originally issued to such holder.  If  the registration
statement has not become effective prior to August 13, 1997, on August 13, 1997,
the Company shall make a payment in cash to each holder of Preferred Stock equal
to three percent (3%) of the Stated Value of the Preferred Stock originally
issued to such holder and shall make an additional three percent (3%) payment at
the end of each full 30 day period thereafter until the earlier of the date the
registration statement becomes effective or February 14, 1997.

The Common Stock of the Company is traded on the Nasdaq National Market (symbol:
ZCAD).  On May 9, 1997, the lowest reported sale price of the Common Stock on
the Nasdaq National Market was $0.84375 per share. 

The Common Warrants are exercisable at any time until February 13, 2002 for 
500,000 Shares at a price of $2.25 per share.  The Preferred Warrants are 
exercisable at such times as the market price of the Common Stock is at least 
$1.50 per share, until February 13, 2002 for 42,858 shares of Preferred Stock 
at a price of $35.00 per share.

The Preferred Stock accrues a premium ("Premium") daily at a rate per share 
(as a percentage of the Stated Value per share) of 6% per annum.  Accrued 
Premium on each share of Preferred Stock is automatically converted into 
Shares at the time of conversion of each such share of Preferred Stock; 
provided, that the Company, at its option, may elect to redeem the Premium in 
cash at the time of conversion. The Preferred Stock is not otherwise 
redeemable at the option of the Company.  On February 13, 2000, all then 
outstanding shares of Preferred Stock and Premium (subject to the Company's 
right to redeem Premium) will convert automatically into Common Stock; 
provided, however, that if any Preferred Stock cannot be converted due to 
limitations on the number of  shares of Common Stock available for issuance 
upon conversion, the remaining Preferred Stock must be redeemed by the 
Company, 

<PAGE>

to the extent funds are legally available therefor, at a redemption price per 
share equal to the greater of (i) 120% of the Stated Value per share of 
Preferred Stock plus accrued Premium, or (ii) the dollar amount which is the 
product of (x) the Conversion Rate (as defined) and (y) the last reported 
sale price of the Common Stock on such date.  The Preferred Stock is also 
redeemable at the option of each holder (i) upon the occurrence of an Event 
of Non-compliance (as defined) or (ii) if insufficient shares of Common Stock 
are available for conversion of such Preferred Stock.  The redemption price 
per share in such case would be the greater of (i) 110% of the Stated Value 
per share of Preferred Stock plus accrued premium or (ii) the dollar amount 
which is the product of (x) the Conversion Rate and (y) the last reported 
sales price of the Common Stock on the date when the notice of redemption was 
delivered.

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 five 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 6 FOR A DISCUSSION OF CERTAIN FACTORS THAT
SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE SECURITIES OFFERED HEREBY.

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 MAY 16, 1997.

                                          2


<PAGE>


                                  TABLE OF CONTENTS
                                                             PAGE

AVAILABLE INFORMATION. . . . . . . . . . . . . . . . . . .      3

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE. . . . . .      3

THE COMPANY. . . . . . . . . . . . . . . . . . . . . . . .      5

RISK FACTORS . . . . . . . . . . . . . . . . . . . . . . .      6

SELLING SECURITYHOLDERS. . . . . . . . . . . . . . . . . .     11

LEGAL MATTERS. . . . . . . . . . . . . . . . . . . . . . .     13

EXPERTS. . . . . . . . . . . . . . . . . . . . . . . . . .     13


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.

                                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 at 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, 1996.

    (b)  The Company's Quarterly Report on Form 10-Q for the quarter ended
March 31, 1997.

                                          3


<PAGE>

    (c)  The Company's Current Reports on Form 8-K dated January 15, 1997,
April 30, 1997 and May 15, 1997.

    (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 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 the  Secretary of the Company at the principal executive offices of
Zycad Corporation, 47100 Bayside Parkway, Fremont, California 94538, or by
telephone at (510) 623-4400.

                                          4


<PAGE>


                                     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
("ProASIC") technology that also provide faster electronic systems design
verification.

As a result of research activities in 1992 to develop emulation technology,
Zycad developed superior FPGA technology applicable to a broader range of
commercial applications in much larger potential markets.  In 1993 Zycad formed
the GateField division to commercially exploit this technology.  In December
1995, Zycad completed its first beta-shipment of its own flash technology based
high-density ProASIC.  These ProASICs, 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 its products and services to a broad range of customers who
design electronic components, products and systems for application in a variety
of electronics industries including aerospace, computer, consumer electronics,
multimedia, networking, semi-conductor and telecommunications.  Customers
include Intel, Advanced Micro Devices, IBM, Lucent Technologies, Hughes,
Siemens, Alcatel, Hitachi, Toshiba, NEC, and Hyundai.

As IC manufacturing process technology continues to advance to smaller
geometries, 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 customer needs for faster simulation and
verification results.  The current LightSpeed simulation server product uses a
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 ProASIC 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 ProASICs, Zycad believes that its ProASICs will 
offer customers certain advantages, including  ASIC design methodologies and 
high 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 $2,140,000 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 ProASIC products are produced by a foundry in Japan, with packaging and
assembly done in the Philippines.  However, final assembly and test for all
products is 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.

                                          5


<PAGE>

                                     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.


NET LOSSES
The Company has experienced operating losses from continuing operations for the
last five fiscal quarters.  The Company sustained a net loss of $21.4 million in
its fiscal year ended December 31, 1996, and has had net losses in four of its
last five fiscal years.  In 1995, the Company had net income of $2.0 million,
and sustained losses of $9.7 million, $4.5 million and $2.8 million in 1994,
1993 and 1992, respectively.  The Company experienced an operating loss for the
fiscal quarter ended March 31, 1997 of $5.6 million.  There can be no assurance
that the Company will be able to achieve a profit in 1997 or in subsequent
quarters and years, or at all.  In the future, the Company's ability to achieve
and sustain profitable operations will depend upon a number of factors,
including the Company's ability to control costs; the Company's ability to
reorganize its operation after the sale in April 1997 of certain operating
assets; the Company's ability to generate sufficient cash from operations or
obtain additional funds to fund its operating expenses; increased sales of its
Gatefield product line; and other factors.

NEGATIVE CASH FLOW; LIMITED WORKING CAPITAL
The Company's history of operating losses and product development activity has
required significant cash funding.  As of March 31, 1997, the Company had a
working capital deficit of $(2.6 million).  In April 1997, the Company agreed to
sell its Lightspeed product family for a purchase price of $5.0 million and its
holdings in Quality Systems Software, Inc. for $3.5 million.  The Company
anticipates that cash generated by these sales and the availability under its
existing credit line, together with sources of additional liquidity such as 
private or public offerings, equipment lease lines and the sale of additional
Company assets will enable the Company to meet its short-term liquidity needs. 
The Company expects that it will require additional financing to support its
future operations.  There can be no assurance that any such additional financing
will be available to the Company on acceptable terms as and when needed by the
Company.

DILUTION 
As of May 14, 1997, the Company has outstanding convertible 
debentures issued in 1996 having an aggregate principal amount of $1.4 
million and Preferred Stock and Preferred Warrants exercisable for Preferred 
Stock having an aggregate Stated Value of $5.0 million.  The debentures are 
convertible into Common Stock at the option of the holder at a price of 80% 
of the average of the lowest reported sales prices for the Common Stock over 
the five trading days prior to conversion.  The Preferred Stock is 
convertible into Common Stock at the option of the holder at a price of 78% 
to 83% of the average of the lowest reported sales prices for the Common 
Stock over the five trading days prior to conversion. These conversion 
formulas result in a conversion price which is less than the market price at 
the time of conversion. Thus,  all conversions of such debentures and 
Preferred Stock into Common Stock  will have a dilutive effect on the holders 
of Common Stock.  The Company may also be required or may chose to sell 
equity securities to obtain financing in the future including the sale of 
additional securities  of the Company to the Selling Securityholders.  If the 
Company sells additional equity securities at a price per share less than the 
then existing market price, investors purchasing shares of Common Stock in 
this offering would incur additional dilution.

DELISTING FROM THE NASDAQ NATIONAL MARKET 
At December 31, 1996, the Company was not in compliance with the requirement 
of the Nasdaq Stock Market for listing on the Nasdaq National Market (a 
distinct tier of the Nasdaq Stock Market) to maintain minimum net tangible 
assets (as defined) of $4.0 million.  In a letter to the Company dated May 8, 
1997, the representatives of the Nasdaq Stock Market indicated that if the 
Company was not able to complete certain transactions which would result in 
the Company having tangible net assets of at least $8.0 million on a pro 
forma basis the Company would be delisted from the Nasdaq National Market. 
The Company believes that this requirement was satisfied by the Company as of 
May 15, 1997, although the Company has not yet received confirmation from the 
Nasdaq Stock Market that such requirement has been satisfied.  Although the 
Company believes that it can continue to comply with the Nasdaq National 
Market listing requirements, there can be no assurance that the Company will 
be successful in doing so.  However, even if its stock were delisted from the 
Nasdaq National Market, the Company believes it would be eligible for listing 
in the Nasdaq SmallCap Market, which is another tier of the Nasdaq Stock 
Market.  However, there can be no assurance that the Company will remain 
eligible for listing on the Nasdaq SmallCap Market.  Failure to maintain its 
listing on the 

                                          6


<PAGE>

Nasdaq National Market or the Nasdaq SmallCap Market would have material adverse
consequences on the Company, including a requirement that the Company's
outstanding Preferred Stock and debentures be redeemed if the Company is not
listed on either the Nasdaq National Market or the Nasdaq SmallCap Market.

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 ProASIC 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 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 year 1993 have been derived from the sale of its PXP simulation 
accelerators, but these  revenues have been declining since 1995.  The 
Company introduced its LightSpeed simulation accelerators in the third 
quarter of fiscal year 1996 with production shipments in fourth quarter of 
fiscal year 1996.  In April 1997, the Company sold the LightSpeed logic 
simulation technology to IKOS Systems, Inc. for $5,000,000.  In addition the 
Company shipped its first GateField ProASIC products in fourth quarter of 
fiscal year 1995 with limited production shipments in the second quarter of 
fiscal year 1996.  Revenues from the sale of GateField ProASIC products were 
$94,000 during the first quarter of fiscal year 1997. There can be no 
assurance that there will be market acceptance of these GateField ProASIC 
products and fault simulation accelerators products.  The adoption of the 
Company's simulation accelerator products for the fault verification of IC 
and system designs is expected to depend on the continued increase in 
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 fault 
simulation of IC designs, the development  and market acceptance of design 
verification technologies such as cycle-based software simulation and 
ProASIC-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 ProASIC 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 ProASICs  to shorten the time to market for ASIC designs, the integration 
of the Company's ProASIC products with EDA tools and methodologies, and the 
development and market acceptance of alternative prototyping systems.  
Because the market for hardware-assisted simulation products and ProASICs  is 
evolving, it is difficult to predict with any assurance whether the market 
for simulation accelerators or ProASICs  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 attain profitability in the future.

COMPETITION
The EDA and IC industries are highly competitive and rapidly changing.  The
Company's products are specifically targeted at growing segments of the IC and
electronic systems industries involving more complex designs that can benefit
from using simulation methodology to verify their designs more quickly and/or
ProASICs for either rapid prototyping verification purposes or for use in lieu
of ASICs 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 these segments of the market.  The Company's
competition currently comes from traditional software verification methodologies
provided by EDA vendors such as Cadence Design Systems, Inc. and Mentor Graphics
Corporation.  In addition the Company faces competition from ProASIC 

                                          7


<PAGE>

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 ProASICs 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 
ProASICs 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 ProASIC 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 have a material adverse effect on 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 have a material adverse effect on 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 and adversely affected.

NEW PRODUCTS AND TECHNOLOGICAL CHANGE
The EDA and IC industries are characterized by extremely rapid technological
change in 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 ProASIC 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 have a material adverse effect.

DYNAMIC ELECTRONICS INDUSTRY TRENDS
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, shortening product life cycles,
fluctuations in manufacturing capacity  as well as  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.

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. and subassemblies and components that are provided by other

                                          8


<PAGE>

third party manufacturers.  In addition the Company's ProASICs are manufactured
by ROHM, a foundry located in Kyoto, Japan and packaged by Anam located in the
Philippines.

COMPONENT AVAILABILITY 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 has historically accounted for a
substantial portion of the Company's net revenues.  In fiscal years 1996, 1995
and 1994, Intel Corporation ("Intel") accounted for 10%, 17% and 14%,
respectively, of the Company's net revenues.  For fiscal year 1996, sales to the
Company's top five customers accounted for approximately 22% 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 and EDA industries, 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.

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 on the part of customers.  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, and higher selling expenses over which the Company may have
little or no control.

PROPRIETARY RIGHTS
The Company's success and ability to compete are  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 seven
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 exists, 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 

                                          9


<PAGE>

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.

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 31%, 30% and 26% of the 
Company's net revenues in fiscal years 1996, 1995 and 1994, 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's
failure to do so could have a materially adverse effect upon the Company's
results of operations.

GATEFIELD NEW BUSINESS RISK 
The GateField ProASIC 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 ProASIC 
business in a different  market with different 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 0.8 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 ProASICs.  The company competes with FPGA 
market leaders like Xilinx, Altera, Actel Corporation and Lucent.  These 
companies use manufacturing process technologies that are more advanced than 
the 0.8 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 ProASIC 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 additional 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 parts from foreign suppliers.  Zycad's
international manufacturing and sales are subject to changes in foreign

                                          10


<PAGE>

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.

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, disputes 
regarding 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.

                               SELLING SECURITYHOLDERS
                                           
The Preferred Stock and the Preferred Warrants were issued by the Company in 
exchange for the Debentures on May 15, 1997, pursuant to Convertible 
Securities Exchange Agreements dated May 15, 1997, and, were acquired by the 
Selling Securityholders.  The Common Warrants were issued on February 14, 
1997, in connection with the issuance of the Debentures.  The following table 
sets forth information concerning the number of shares of Common Stock 
issuable upon conversion of the issued and outstanding Preferred Stock, the 
Preferred Stock issuable upon exercise of the Preferred Warrants and the 
Common Stock issuable upon exercise of the Common Warrants 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.

                                  Maximum Number of
                                  Shares That May be Sold (1) (2)

Halifax Fund L.P.                           1,765,638
Capital Ventures International              1,765,638
Heracles Fund                                 504,468
Lewis A. Fraser                               504,468
Joseph A. Umbach                              504,468

- ------------------------------------------
(1) The information set forth herein is as of May 15, 1997 and will be updated
    as required.

(2) This number includes an indeterminate number of additional shares which may
    become issuable upon conversion by reason of adjustments and fluctuations
    of the conversion price.  The last reported sale on the Nasdaq National
    Market on May 9, 1997, was $0.84375 per share.  At a conversion rate of
    $0.7003125 per share (which would be the applicable rate on May 15, 1997,
    assuming a market price of $0.84375), the Preferred Stock held by each 
    Selling Shareholder would be converted into 1,775,386 shares each for two
    of the parties and 507,252 for each of the other three parties for a 
    total of 5,072,528 Shares. The outstanding Preferred Stock by its terms 
    may not be converted into more than 5,044,680 Shares in the aggregate 
    (although 6,044,680 shares have been reserved for issuance) unless 
    stockholder approval 


                                          11


<PAGE>

is obtained.  If such stockholder approval is obtained, additional Shares 
above this maximum could be issued.  Under the terms of the Preferred Stock, 
fractional shares will not be issued upon conversion of the Preferred Stock; 
instead the number of Shares issuable upon conversion will be rounded up or 
down to the nearest whole number.

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 Preferred Stock is subject to adjustment 
under certain circumstances.  In addition, accrued Premium may be converted 
in Shares unless the Company, at its option, redeems such Premium.  
Accordingly, the aggregate Stated Value of Preferred Stock and the number of 
Shares issuable upon conversion of the Preferred Stock may increase or 
decrease.  As of the date of this Prospectus, the aggregate Stated Value of 
the Preferred Stock outstanding is $3,500,000 which, together with accrued 
Premium, may be converted into 5,072,528 Shares assuming a conversion price 
of $0.7003125 per share.  Up to 42,858 additional shares of Preferred Stock 
having an aggregate Stated Value of $1,500,030 are issuable upon exercise of 
the Preferred Warrants.  Such additional shares of Preferred Stock would be 
convertible into 2,141,944 Shares at a conversion price of $0.7003125 per 
share. Unless stockholder approval is obtained, the maximum number of Shares 
issuable is 5,044,680 including up to 500,000 shares reserved for exercise of 
the Common 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 (i) up to 5,044,680 shares of the
Common Stock of the Company which may be issued upon conversion of the Preferred
Stock,  (ii) conversion of Preferred Stock issuable upon exercise of  the
Preferred Warrants, and (iii) the exercise of the Common Warrants.  The number
of shares issuable upon conversion of the Preferred Stock (including that
issuable upon exercise of the Preferred Warrants) and exercise of the Common
Warrants is initially limited to 5,044,680 shares (although 6,044,680 shares
have been reserved for issuance) unless the Company obtains stockholder approval
of the issuance of additional shares of Common Stock upon conversion of the
Preferred Stock.  Because of the possibility of antidilution adjustments to the
conversion price of the Preferred Stock (which is based on the market price of
the Common Stock), the number of shares of Common Stock issuable upon such
conversion or exercise and subject to this Prospectus is indeterminate and this
Prospectus relates to the resale of such entire indeterminate number of shares
of Common Stock.

The Company will not receive any of the proceeds from the offering of the shares
of Common Stock issuable upon conversion of the Preferred Stock by the Selling
Securityholders and which are sold pursuant to the Registration Statement (of
which this Prospectus is a part).  The Company may receive approximately
$2,625,030 upon exercise of the Common Warrants and Preferred Warrants (neither
of which are subject to this Prospectus), but will not receive any proceeds of
the sale of any Shares issued upon exercise thereof. The Company has been
advised by the Selling Securityholders that the Selling Securityholders may sell
all or a portion of the shares of Common Stock beneficially owned by them and
which may be offered hereby from time to time on any exchange or market on 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,
dealers or agents, who may receive compensation in the form of underwriting
discounts, commissions or concessions from the Selling Securityholders and the
purchasers of the Preferred Stock of shares of Common Stock for whom they may
act as agent.  The Selling Securityholders may sell Common Stock short and
deliver shares of Common Stock registered hereby to close out such short
positions.

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 

                                          12


<PAGE>

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 or
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 Preferred
Stock have been authorized for listing on the Nasdaq National Market upon
official notice of issuance.  In order to comply with the securities laws of
certain states, if applicable, the Preferred Stock 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 Preferred Stock
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 Shares
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
Preferred Stock or shares of Common Stock offered hereby and purchased by them
may be deemed to be underwriting commissions or discounts under the Securities
Act.

                                    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, 1996 have been audited by Deloitte &
Touche LLP, independent auditors, as stated in their report on the financial
statements (which expresses an unqualified opinion and includes an explanatory
paragraph relating to an uncertainty of the Company's ability to continue as a
going concern), 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.

                                          13


<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:

SEC registration fee                                  $ 1,503
Legal expenses                                         30,000
Accounting fees and expenses                            5,000
Miscellaneous                                             500
                                                      -------
Total                                                 $37,003
                                                      -------
                                                      -------


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 Article 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 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

5.1      Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23.1     Consent of Counsel (contained in Exhibit 5.1 hereto).
23.2     Consent of Deloitte & Touche LLP, independent auditors.
24.1     Power of Attorney.


ITEM 17. UNDERTAKINGS

The undersigned Registrant hereby undertakes:


                                          14


<PAGE>

    (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 paragraphs (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.

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.

                                          15


<PAGE>

                                      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 Form S-3 and has duly 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 16th day of May,
1997.


                                  ZYCAD CORPORATION



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


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. 


Signature                         Title                              Date   

/s/ PHILLIPS W. SMITH   President and Chief Executive Officer       May 16, 1997
- ---------------------   (Principal Executive Officer)
   (Phillips W. Smith)

/s/ STEPHEN A. FLORY
- --------------------    Chief Financial Officer and Treasurer       May 16, 1997
   (Stephen Flory)      (Principal Financial Officer and 
                        Principal Accounting Officer)

/s/   *             
- --------------------
   (Horst G. Sandfort)  President, GateField Division and Director  May 16, 1997

/s/   *             
- --------------------
   (Benjamin Huberman)  Director                                    May 16, 1997

/s/   *              

- --------------------
   (James R. Fiebiger)  Director                                    May 16, 1997


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

                                          16

<PAGE>

                                  ZYCAD CORPORATION
                                           
                          REGISTRATION STATEMENT ON FORM S-3
                                           
                                  INDEX TO EXHIBITS
                                           

Exhibit                                                          
Number                                                              

5.1        Opinion of Wilson Sonsini Goodrich & Rosati, 
           Professional Corporation.
23.1       Consent of Counsel (contained in Exhibit 5.1 hereto).
23.2       Consent of Deloitte & Touche LLP.
24.1       Power of Attorney.

                                          17


<PAGE>
                                           
                                     EXHIBIT 5.1
                                           




Zycad Corporation
47100 Bayside Parkway
Fremont, California 94538

    RE:  REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

    We have examined the Registration Statement on Form S-3 to be filed with
the Securities and Exchange Commission (the "Registration Statement"), in
connection with the registration under the Securities Act of 1933, as amended,
of up to 6,044,680 shares of Common Stock, $0.10 par value, of Zycad Corporation
(the "Shares").  The Shares are issuable upon conversion of the Company's Series
A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series
A-3 Convertible Preferred Stock, Series A-4 Convertible Preferred Stock and
Series A-5 Convertible Preferred Stock (collectively, the "Preferred Stock"). 
As your counsel, we have examined the proceedings proposed to be taken in
connection with the issuance of the Shares upon the conversion of the Preferred
Stock.

    It is our opinion that, upon completion of the proceedings being taken or
contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares upon due and proper conversion of the Preferred Stock in accordance with
its terms, and upon completion of the proceedings being taken in order to permit
such transactions to be carried out in accordance with the securities laws of
the various states, where required, the Shares, when issued and sold in the
manner referred to in the Registration Statement, will be legally and validly
issued, fully paid and nonassessable.

    We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and any amendment thereto.

                             Very truly yours,

                             WILSON SONSINI GOODRICH & ROSATI
                             Professional Corporation


                             /s/ Wilson Sonsini Goodrich & Rosati, P.C.

<PAGE>
                                     EXHIBIT 23.2

                            INDEPENDENT AUDITORS' CONSENT


We consent to the incorporation by reference in this Registration Statement of
Zycad Corporation on Form S-3 of our report on the financial statements (which
expresses an unqualified opinion and includes an explanatory paragraph relating
to an uncertainty of the Company's ability to continue as a going concern),
dated March 11, 1997 (April 14, 1997 as to the last paragraph of Note 5 and as
to Note 11) appearing in and incorporated by reference in the Annual Report on
Form 10-K of Zycad Corporation for the year ended December 31, 1996 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
May 14, 1997



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