Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!dkuug!freja.diku.dk!rimfaxe.diku.dk!jensting
From: jensting@rimfaxe.diku.dk (Jens Tingleff)
Newsgroups: comp.sys.atari.st
Subject: Re: 3.0mb ST bin
Message-ID: <1990Jul23.135351.4486@diku.dk>
Date: 23 Jul 90 13:53:51 GMT
References: <5223@castle.ed.ac.uk> <581@accucx.cc.ruu.nl>
Sender: news@diku.dk (The Netnews System)
Organization: Department Of Computer Science, University Of Copenhagen
Lines: 38

jeroen@plato.phil.ruu.nl (Jeroen Scheerder) writes:

>In article <5223@castle.ed.ac.uk>, tj@castle.ed.ac.uk (T Jones) writes:
[..]
>I was the one posting about the 3.0 Mb modification; however, having read the
>article that explaining it all (it's from a German magazine, I think it's
>called 'ST Magazin' or something) I decided I would let someone more experienced
>should do the work for me.
>Looking in my computer I see 2 SIMMs, and a *LOT* of wire.

I, for one, doubt that you are *at all* able to make the ST use 3.0 MB. There
are two banks of memory, each wth either 0.5 MB or 2.0MB. That makes

	0.5 MB		1x0.5
	1.0 MB		2x0.5
	2.0 MB		1x2.0
	2.5 MB		1x0.5 + 1x2.0		Not available from Atari ...
	4.0 MB		2x2.0

The above calculation is based on the fact that the MMU knows about 
two banks, NO MORE. the nice thing ( ;-) ) is that the MMU autodetects.. .

So, no unused 0.5 MB in a 2.5MB installation, no 3.0 MB installation
possible.

Disclaimer
	This may not be true for STEs, I don't know.. .
	Do correct me if I'm wrong.

*IF* I'm wrong, please give a reference to the relevant article.. .
(I have seen ads for 5.0MB extensions, where the last 1 MB was 
used for RAM disk, so perhaps....)

	Jens
Jens Tingleff MSc EE, Institute of Computer Science, Copenhagen University
Snail mail: DIKU Universitetsparken 1 DK2100 KBH O
"It never runs around here; it just comes crashing down"
	apologies to  Dire Straits