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From: neil@cs.hw.ac.uk (Neil Forsyth)
Newsgroups: comp.sys.atari.st
Subject: Re: More than 4 Meg ??
Message-ID: <3187@odin.cs.hw.ac.uk>
Date: 10 Jun 91 08:24:37 GMT
References: <91154.141443SYSPMZT@GECRDVM1.BITNET> <1991Jun4.112631.10649@cs.nott.ac.uk> <3153@odin.cs.hw.ac.uk> <1991Jun5.222630.24777@jato.jpl.nasa.gov> <2642@m1.cs.man.ac.uk>
Sender: news@cs.hw.ac.uk
Reply-To: neil@cs.hw.ac.uk (Neil Forsyth)
Organization: Computer Science, Heriot-Watt U., Scotland
Lines: 31

In article <2642@m1.cs.man.ac.uk> camm@els.ee.man.ac.uk (Ian Camm) writes:
>	Well 2.5Mb does work on my 520STE with TOS 1.6, but it does think there
>are 4Mb there. I have not had any problems yet but I have not (knowingly)
>tried to use all of the memory thus far. I have the feeling that when I
>do I will commit mass bit murder :-) by trying to throw them into spaces that
>aren't there. I will try changing the boards round and let you know what
>happens.

What you have is 2.5Mb of RAM with the last 512K duplicated 4 times. Your
machine thinks it has 4Mb. If you create a 2Mb RAM disk that sits in low
RAM then use your machine you'll see weird behaviour as the multiple images
get used. You need a little patch program that checks phystop and the memory
controller at bootup andif it's 4Mb set it to 2.5Mb then reboot.

Actually what we all need is for Atari to fix the &^%*$ ROMs!

Does TOS 1.62 have the same problem?

>Ian Camm                           | JANET: camm@uk.ac.man.ee.els
>Dept. of Electrical Engineering    | ARPA:  camm@els.ee.man.ac.uk
>University of Manchester, England  | UUCP:  ...!!ukc!man.ee.els!camm
>Disclaimer: If you think I need one make it up yourself.

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! DISCLAIMER:Unless otherwise stated, the above comments are entirely my own !
!                                                                            !
! Neil Forsyth                      JANET:  neil@uk.ac.hw.cs                 !
! Dept. of Computer Science         ARPA:   neil@cs.hw.ac.uk                 !
! Heriot-Watt University            UUCP:   ..!ukc!cs.hw.ac.uk!neil          !
! Edinburgh, Scotland, UK           "That was never 5 SIMMs!"                !
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