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From: brianw@microsoft.UUCP (Brian Willoughby)
Newsgroups: comp.sys.apple
Subject: Re: Speed....
Summary: TransWarp (II Plus) vs. Zip & Rocket Chip(s)
Message-ID: <8194@microsoft.UUCP>
Date: 24 Oct 89 20:48:03 GMT
References: <8910180053.aa04251@SMOKE.BRL.MIL>
Reply-To: brianw@microsoft.UUCP (Brian Willoughby)
Organization: Microsoft Corp., Redmond WA
Lines: 39

In article <8910180053.aa04251@SMOKE.BRL.MIL> UD182050@VM1.NODAK.EDU (Mike Aos) writes:
>One question that's bothered me for a while.  The TransWarp IIe has a 65C02, or
>65802 on it, right?  And it make yer 'puter buzz along at what, 3.6Mhz?  Then
>you've get yer nifty little Zip and Rocket chips that replace the 65C02 on a
>IIe (or IIc, for arguements sake).  So what happens if you put a 10Mhz Rocket
>Chip on a TransWarp?
>Just wondering....
>
>Osiris

Well, the Zip/Rocket Chips IGNORE the 1 MHz clock from the Apple
motherboard, so they would still ignore the 3.58 MHz clock from the
TransWarp.  Matthew Stier had a good point though, the replacement CPU
might be able to access memory at 3.58 MHz instead of 1 MHz.  But I would
think that there would still be problems with the Zip/Rocket trying to
synchronize with the TransWarp clock, which is constantly changing as it
tries to stay in sync with the 1 MHz clock.

While I'm on the subject, I've been meaning to mention that the TransWarp
is a good consideration for slot based acceleration.  The price is coming
down, and you get much more memory with the TransWarp.  I own one for my
II Plus (clone) and it performs flawlessly with all my software and
commercial peripherals (my "custom" slot cards complain a little).  I
chose the TransWarp because it offers more consistent speedup.  The Zip
only has 8 K of RAM, so if you access a 32 K array, you will be running
at 1 MHz for the most part.  I was developing sound sampling hardware for
my Plus, so 8 K wasn't enough.  Besides, the TransWarp gives my Plus all
the 128 K RAM of a //e!  The Zip and Rocket limit you to 8 bits also, but
the TransWarp has the option for the 16 bit W65C802.

Of course, the TransWarp only works on Apples with slots AND the newer
replacement processors do run faster than the TransWarp.  (Until the next
TransWarp is released!)

Brian Willoughby
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