Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!haven!uvaarpa!hudson!astsun9.astro.Virginia.EDU!gl8f
From: gl8f@astsun9.astro.Virginia.EDU (Greg Lindahl)
Newsgroups: comp.sys.atari.st
Subject: Re: Gadgets by Small - Possible new '030 add-on board!
Message-ID: <2278@hudson.acc.virginia.edu>
Date: 15 Nov 89 02:51:04 GMT
References: <23970@cup.portal.com>
Sender: news@hudson.acc.virginia.edu
Reply-To: gl8f@astsun.astro.Virginia.EDU (Greg Lindahl)
Organization: Department of Astronomy, University of Virginia
Lines: 20

In article <23970@cup.portal.com> Xorg@cup.portal.com
(Peter Ted Szymonik [ quoting dave small ]) writes:

[ Dave Small's blurb about this maybe-030 upgrade for the ST... ]

> We will also "clock" the 68030 processor at a much higher speed
> than the ST's 68000. The ST runs at 8 mhz (millions instructions / 
> second); we'll go for at least 16 Mhz and possibly more.

This is wrong. The ST has a clock rate of 8 mhz. But it takes 4 cycles
for the processor to fetch a word from memory, and so memory is really
available only 2 million times a second. Then access is interleaved
between video/refresh and the CPU, so the CPU gets 1 million per second.
Gosh, I don't really remember anymore. Anyway, it isn't 8 million
instructions per second.


------
Greg Lindahl
gl8f@virginia.edu                                  Astrophysicists for Choice.