Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!pro-colony.cts.com!crash
From: crash@pro-colony.cts.com (John Stephen III)
Newsgroups: comp.sys.apple
Subject: Re: 10 MHz 65C816 chips (was Re: Applefestive)
Message-ID: <8910030624.AA05176@trout.nosc.mil>
Date: 2 Oct 89 16:00:26 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 31

Network Comment: to #10579 by microsoft!brianw@uunet.uu.net

Bill Mensch has been able to produce SOME 10MHz '816s been he has never been
able to produce them in quantity.  Our TransWarp GS board is capable of 
running at 10MHz+ speeds and, as many TWGS owners know, we have a hard time
just getting chips that'll run at 7MHz!  We've had some samples of 10MHz
parts and we demonstrated a TWGS running at 10MHz at the Boston Applefest.
Even these parts, which WDC rated as 10MHz, would not really run as specified.
The power supply voltage needed to be boosted to 5.5v and small amounts of
heat would caused them to crash.  The problem with the faster chips is not
in the timing between the TWGS and processor -- the problem is that certain
instruction combinations will not work at the rated speed (this is true all
the way down to the 6MHz (or whatever) parts that really are available) and
the TWGS board "watches" for these combinations and slows down for them.  In
short (in long?), faster parts are in the future but we have not seen them.
I wish Mr. Mensch the best of luck in producing them as well (I'd certainly
like to have my //gs running at 10-20MHz!).  One other interesting note -
another company (I forget the name) is working on their own 816 which they
are estimating will run in the 15-20MHz range.  Should be interesting...

John Stephen

"These opinions are my own, my employer doesn't endorse them, blah blah blah"


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