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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.micro
Subject: Re: Atari 520ST
Message-ID: <5594@utzoo.UUCP>
Date: Tue, 14-May-85 12:22:15 EDT
Article-I.D.: utzoo.5594
Posted: Tue May 14 12:22:15 1985
Date-Received: Tue, 14-May-85 12:22:15 EDT
References: <2376@wateng.UUCP>
Organization: U of Toronto Zoology
Lines: 17

>   I think the guy's observation that they would expand to 4 meg eventually
> is interesting; I can see 2 Meg easily enough (just replace the 256k dynamics
> with 1 megabit chips), but 4 meg would require 2 meg chips, which won't be
> state of the art for a while.  I suspect the chips are soldered in (sigh)
> so the upgrade will be a replacement of the whole keyboard unit (or at least
> the processor board). ...

It will have to be.  The packages for the 1-meg chips will be totally
incompatible with the packages for the 256k chips.  The 64k->256k transition
was unusually easy, because the switch to +5-only power on the 64k left
a spare pin for the 256k's extra address line.  But the 256k chips have
pushed the 16-pin DIP as far as it will go, and the semiconductor companies
seem to be talking about total package redesign rather than an attempt
to expand to a nearly-compatible 18-pin DIP.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry