EXHIBIT 99.1



                MENTOR GRAPHICS TERMINATES OFFER FOR QUICKTURN

WILSONVILLE, OR, JANUARY 8, 1999 -- Mentor Graphics Corporation (Nasdaq: 
MENT) announced that effective today it is terminating its tender offer, 
proxy solicitation and its proposal to acquire Quickturn Design Systems, Inc. 
(Nasdaq: QKTN), and is withdrawing its call for the special meeting which had 
been scheduled for today.

Dr. Walden C. Rhines, President and CEO of Mentor Graphics, said:  "It is 
clear that in any further bidding for Quickturn, Mentor faced significant 
barriers and therefore we determined that continued participation would not 
be in our shareholders' best interests.  We congratulate Jack Harding and the 
Cadence team, and we look forward to competing with Cadence in the EDA 
marketplace as we have for many years.  Mentor believes that emulation should 
be an important verification tool for designers if innovative emulation 
systems are made available to them.

"I particularly want to thank the many people who worked so hard to try to 
make this acquisition happen.  They can feel justly proud that the EDA 
industry will be a better, more productive one.  In particular, I want to 
thank the employees of Mentor Graphics who, despite all the distractions of 
this activity, kept their eye on the ball and turned in all-time record 
performance for Mentor in the fourth quarter of 1998.  It's likely that they 
have taken Mentor to the #1 spot among the EDA majors, in terms of the 
all-important measure: product growth rate.  My thanks to our customers and, 
again, to all of our Mentor associates," concluded Dr. Rhines.

Mentor Graphics Corporation is a world leader in electronic hardware and 
software design solutions, providing products and consulting services for the 
world's largest electronics and semiconductor companies.  Established in 
1981, the company reported revenues over the last 12 months of $468 million 
and employs approximately 2,500 people worldwide.  Company headquarters are 
located at 8005 S.W. Boeckman Road, Wilsonville, Oregon 97070-7777. World 
Wide Web site: http://www.mentor.com.

Certain statements contained in this press release constitute 
"forward-looking" statements within the meaning of Section 21E of the 
Securities Exchange Act of 1934, as amended.  Such forward-looking statements 
involve known and unknown risks, uncertainties and other factors that may 
cause the actual results, performance or achievements expressed or implied by 
such forward-looking statements.

Contacts: Anne M. Wagner/Ry Schwark         Todd Fogarty/Roy Winnick
          Mentor Graphics Corporation       Kekst and Company
          503/685-1462                      212/521-4800

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