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From: bwhite@oucsace.cs.OHIOU.EDU (Bill White)
Newsgroups: comp.sys.atari.st
Subject: Re: Memory speeds of ST & STE
Summary: Problems with 150ns chips ...
Message-ID: <1174@oucsace.cs.OHIOU.EDU>
Date: 1 Mar 90 06:45:49 GMT
References: <1990Feb24.222700.22004@newcastle.ac.uk> <729@duteca.UUCP>
Organization: Ohio University CS Dept., Athens
Lines: 18

In article <729@duteca.UUCP>, knop@duteca (P. Knoppers) writes:
> 
> I recently upgraded my 1040 STf to 2.5 MB. I have now 16 256kbit chips
> that are rated 150 ns on my shelve doing nothing (any takers ?). So the
> answer to your first question is: 150 ns is sufficiently fast for an
> 8 MHz MC 68000. (Does the STe run on 8 MHz ?)
> 

	Keep in mind, however, that both the microprocessor AND the video
chip have to access that RAM in one cycle.  I've heard that 150ns chips
can cause problems with Overscan, for instance.  I don't offhand know which
I have, I think I have 150ns, but I've had erratic memory problems ever
so often, and (though I can't prove anything) I suspect it may be because
one of these chips is "not quite" 150ns.  So get 120ns and be safe, at
the very least.  Besides, they aren't that much more expensive these days.

					Bill White
					bwhite@oucsace.cs.ohiou.edu