Path: utzoo!attcan!uunet!mcvax!unido!laura!hmm
From: hmm@laura.UUCP (Hans-Martin Mosner)
Newsgroups: comp.sys.atari.st
Subject: Re: Memory expansion
Message-ID: <644@laura.UUCP>
Date: 1 Oct 88 09:28:19 GMT
References: <880920-061901-3633@Xerox> <1988Sep25.190723.17209@gpu.utcs.toronto.edu> <803@cacilj.UUCP>
Reply-To: hmm@laura.UUCP (Hans-Martin Mosner)
Organization: Georg Heeg Smalltalk-80 Systems
Lines: 19

In article <803@cacilj.UUCP> paul@cacilj.UUCP (Paul Close) writes:
>Question: why are all the boards for 2.5 or 4 meg?  As I understand it, the
>ST can have 2 banks of memory.  I have a 1040, so that's one bank with one
>meg.  If I add 1 meg on the other bank, that's 2 meg (just like the mega-2).
>Where, then, do the 2.5 meg boards come in?

Due to the sizes of memory chips (256K*1, 1024K*1) and the number of memory
chips required for one bank (16), one bank has either 0.5 or 2 Megabyte.
So the 1040 has 2 banks of 0.5 each, the Mega 2 has just 1 bank of 2 meg.
The options for upgrading a 1040 are therefore:
	1. rip out one bank, make it 2 meg, get 2.5 meg total
	2. rip out both banks, make them both 2 meg, get 4 meg total

Hans-Martin
-- 
Hans-Martin Mosner		| Don't tell Borland about Smalltalk - |
hmm@unido.{uucp,bitnet}		| they might invent Turbo Smalltalk !  |
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