Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mailrus!cs.utexas.edu!sun-barr!apple!fox!portal!cup.portal.com!Ordania-DM
From: Ordania-DM@cup.portal.com (Charles K Hughes)
Newsgroups: comp.arch
Subject: Differing clock rates in one system...
Message-ID: <24992@cup.portal.com>
Date: 14 Dec 89 02:24:49 GMT
References: <3069@cello.UUCP> <8861@cbmvax.UUCP>
Distribution: usa
Organization: The Portal System (TM)
Lines: 16


   I've been looking through USENET to find the appropriate place for this
question and since I found this conversation about "System clock rates vs.
memory accesses" I figured this was the best place.
   Anyway my question is: can I speed up my computer?
      The computer is a 6502 running at 1.79MHz with a 6520, 64k ram/rom, 
and 3 special purpose chips that provide interrupts, i/o, and graphics.  
I want to speed up the 6502, 6520, and ram/rom to run at 3.59MHz, and I want
the other chips to stay at 1.79MHz.  I can get 4MHz versions of the 6502 and
6520, but not of the special chips.  One of the special chips will steal
cycles from the 6502 in order to read ram (never writes).  Can I do this 
without redesigning the computer?

  Thanks
 Charles Hughes
 @cup.portal.com