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From: tmp@doc.ic.ac.uk (Trevor Peacock)
Newsgroups: comp.sys.atari.st.tech
Subject: stacking 256k simms
Message-ID: <2190@gould.doc.ic.ac.uk>
Date: 15 Aug 90 15:41:56 GMT
Sender: tmp@doc.ic.ac.uk
Reply-To: tmp@doc.ic.ac.uk (Trevor Peacock)
Organization: Dept. of Computing, Imperial College, London, UK.
Lines: 18

Has anyone tried (or even considered) using blocks of four 256k simms to give
1Mb banks? Of course, this would require demultiplexing address line A9 into
two bits to select one of the 256k blocks within the 1 meg bank. Has this
be done? Is the ST's chippery able to handle the loading caused by the 
simms being connected in parallel? (this would be a total of 8 per bank for a 
4 Mb system, two groups of eight in parallel)  
I'm sure this is a minefield of capacitance and timing problems, but would 
like to know whether anyone has had any success.

Trev..

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