<PAGE>
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 10)
Zycad Corporation
-----------------
(Name of Issuer)
Common Stock
------------
(Title of Class of Securities)
989845 10 2
-----------
(CUSIP Number)
Check the following if a fee is being paid with this statement [X]. (A fee is
not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent of such class.) (See
Rule 13d-7).
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
CUSIP NO. 989845 10 2 13G
- ------------------------------------------------------------------------------
1 NAME OR REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Norwest Corporation
Taxpayer Identification No. 41-0449260
- ------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE LINE IF A MEMBER OF A GROUP* (a)
-------
(b)
-------
- ------------------------------------------------------------------------------
3 SEC USE ONLY
- ------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
- ------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES 765,238
---------------------------------------------------------
BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY 1,000
---------------------------------------------------------
EACH 7 SOLE DISPOSITIVE POWER
REPORTING 804,750
---------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH 101,488
- ------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
906,238
- ------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- ------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
Less than 5%
- ------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*
HC
- ------------------------------------------------------------------------------
2
<PAGE>
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Item 1(a) Name of Issuer:
- --------- ---------------
Zycad Corporation
Item 1(b) Address of Issuer's Principal Executive Offices:
- --------- ------------------------------------------------
47100 Bayside Parkway
Fremont, CA 94538
Item 2(a) Name of Person Filing:
- --------- ----------------------
1. Norwest Corporation
Item 2(b) Address of Principal Business Office(s):
- --------- ---------------------------------------
1. Norwest Corporation
Norwest Center
Sixth and Marquette
Minneapolis, MN 55479-1000
Item 2(c) Citizenship:
- --------- -----------
1. Norwest Corporation is a Delaware corporation.
3
<PAGE>
Item 2(d) Title of Class of Securities:
- --------- ----------------------------
Common Stock
Item 2(e) CUSIP Number:
- --------- ------------
989845 10 2
Item 3 If this Statement is filed pursuant to Rule 13d-1(b) or 13d-2(b):
- ------ ---------------------------------------------------------------
Not Applicable
Item 4 Ownership:
- ------ ---------
1. Norwest Corporation
(a) Amount Beneficially Owned. At December 31, 1993, Norwest
Corporation was deemed to own, indirectly through its
subsidiaries, 906,238 shares. This amount represented less than
5% of the total shares of common stock outstanding at that date.
Norwest Corporation has no other rights to acquire additional
shares through the exercise of options or otherwise.
Item 5 Ownership of Five Percent or Less of Class:
- ------ ------------------------------------------
If this statement is being filed to report the fact that as of
the date hereof the reporting persons have ceased to be the
beneficial owners of more than five per cent of the class of
securities, check the following [x].
4
<PAGE>
Item 6 Ownership of More than Five Percent on Behalf of Another
- ------ --------------------------------------------------------
Person:
------
Not Applicable
Item 7 Identification and Classification of the Subsidiary Which
- ------ ---------------------------------------------------------
Acquired the Security Being Reported on by the Parent Holding
-------------------------------------------------------------
Company:
-------
Not Applicable
Item 8 and Item 9
- -----------------
Not Applicable
Item 10 Certification:
- ------- -------------
By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the purpose
of and do not have the effect of changing or influencing the
control of the issuer of such securities and were not acquired in
connection with or as a participant in any transaction having
such purposes or effect.
Signature:
---------
After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this
statement is true, complete, and correct.
Dated: February 8, 1994
NORWEST CORPORATION
By /s/ Laurel A. Holschuh
------------------------------------
Laurel A. Holschuh, Senior Vice President
and Secretary
5
