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From: dpg@cs.nott.ac.uk (Dave Gymer)
Newsgroups: comp.sys.atari.st
Subject: Re: More than 4 Meg ??
Message-ID: <1991Jun4.112631.10649@cs.nott.ac.uk>
Date: 4 Jun 91 11:26:31 GMT
Article-I.D.: cs.1991Jun4.112631.10649
References: <91154.141443SYSPMZT@GECRDVM1.BITNET>
Organization: Nottingham University
Lines: 27

In article <91154.141443SYSPMZT@GECRDVM1.BITNET> SYSPMZT@gecrdvm1.crd.ge.com writes:
>The implication I've heard is that I can only address 4 Meg with my 1040 STe.
>I've already upgraded to that point with 4 1-Meg SIMMS, and am wondering if,
>should memory prices drop in the future, I'll be able to expand with
>4 2-Meg or 4 4-Meg SIMMS.
>
>Is there an architectural restriction limiting a 1040 STe to addressing
>4 Meg, and if so, what is that restriction?  Also, can anyone explain if and
>why I must add symetric amounts of memory in the SIMM slots? (eg 4 1-Meg, not
>1 1-Meg and 3 256K, etc.)

The answer to both questions is, I believe, that the MMU in the STe can
only handle .25 and 1 meg SIPPS/SIMMS, and these are arranged in two banks,
which must contain the same amount (hence, memory configurations can only
be .5 meg, 1 meg, 2 meg, 2.5 meg, and 4 meg). I too have a four meg STe.

Perhaps someone out there knows of a replacement MMU and memory slots? (Could
it be that a 68030 board might have this facility?).

Question is, what would you do with more than 4 meg on an ST running TOS (or
MiNT). I've yet to exhaust 4 meg (even with GCC, MGR, and BASH. Emacs coming
soon... :-)
-- 
/* 'Grave' Dave Gymer --------- Internet: dpg@Cs.Nott.AC.UK *\
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