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From: stigvi@Siri.Unit.NO (Stig Vidar Hovland)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Homebrew SIMM expansion.
Message-ID: <1990Nov1.161027.8847@ugle.unit.no>
Date: 1 Nov 90 16:10:27 GMT
References: <2408@gould.doc.ic.ac.uk>
Sender: news@ugle.unit.no
Reply-To: stigvi@Siri.Unit.NO (Stig Vidar Hovland)
Organization: Norwegian Institute of Technology
Lines: 24

In article <2408@gould.doc.ic.ac.uk>, tmp@doc.ic.ac.uk (Trevor Peacock) writes:
|> 
|> In my never ending quest for memory (without the price :^) I tried a simple 
|> experiment on my ST. 
|> 
|> What I did was to remove the 8 highest bits from bank 1 in my ST and wire up 
|> a SIMM socket so that the corresponding data, address, cas, ras & write lines 
|> went to those which the 41256's had occupied. 
|> I triple checked this, plugged a 256k SIMM into the socket, powered up and...
|> BINGO!! the ST couldn't see the top bank. 
|> 
|> 
|> -------------------------------------------------------------------------------
|> Trevor Peacock,		 | Tel : 071 589 5111 X 5052 | JANET : tmp@uk.ac.ic.doc 
|> Department of Computing, | DARPA : tmp@doc.ic.ac.uk 
|> Imperial College,        \ or      tmp%uk.ac.ic.doc@nsfnet-relay.ac.uk
|> 180 Queens Gate,London SW7 2BZ |    UUCP : tmp@icdoc.UUCP or ..!ukc!icdoc!

I have just wired up 2 1MB SIMMs in my 520STF, and together with the old
memory my ST have a total of 2.5MB. I used SIMMs with a 9bit databus, but
2 8bit SIMMs should work fine too.
You must have done something wrong. Maybe you should triple check it twice.

Stig Vidar Hovland - stigvi@siri.unit.no