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From: torq@tardis.computer-science.edinburgh.ac.uk
Newsgroups: comp.sys.acorn
Subject: Master and Slave MEMCs in the 540 and R series
Keywords: memc 540 slave
Message-ID: <9106041851.AA18049@ucbvax.Berkeley.EDU>
Date: 4 Jun 91 16:45:50 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: Unix Anarchy, Edinburgh University.
Lines: 19

I am hoping to design a 4 meg ram card for my 540, as the acorn ram card seems 
ridiculously overpriced at 449 quid or so.

My question is :- 
What does IC39 do to page the other slave MEMCs? As far as I can see it uses
the unused bits in the page descriptor to page each MEMC but how?

I do have a copy of the VLSI manual of course, but there doesnt seem to be any
pointers in there. I've calculated that I can make a ram card for approx 150
quid, so it does seem the acorn card is ?slightly? overpriced

Has anyone else looked into this subject?

Any help or pointers appreciated.

Andy
------------------------------------------------------------------------------
Andy Mell  (torq@uk.ac.ed.cs.tardis)
           (torq@gnu.ai.mit.edu)