Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!munnari.oz.au!cluster!metro!news
From: jimr@maths.su.oz.au (Jim Richardson)
Newsgroups: comp.sys.apollo
Subject: 2500 memory: banks of 4?
Message-ID: <1990Feb14.101624.5666@metro.ucc.su.oz.au>
Date: 14 Feb 90 10:16:24 GMT
References: <9001251400.AA20814@richter.mit.edu>
Reply-To: jimr@maths.su.oz.au (Jim Richardson)
Organization: Dept of Pure Mathematics, University of Sydney
Lines: 24

Am I right in assuming that memory can only be added to a DN2500 in multiples
of 4 SIMMS, that is, in multiples of 4 megabytes in the case of 1MB x 9
SIMMS?  This is not mentioned in the "Domain 2500 Series Owner's Guide".
However, the memory sizing output at boot time suggests that memory is being
interleaved, with each of the four bytes in a longword coming from a
different SIMM.  

We would like to add memory to some of our 2500s, because with 4MB they seem
to give much slower response than even our previous DN3000s with 4MB.
Presumably this is because SR10.2 eats much more memory than SR10.1, though
we haven't even started running X yet.  We had hoped to compromise between
performance and cost by installing an extra 2MB in each node.  Is it really
an extra 4MB or nothing?

Thanks in advance for any information.

--
Jim Richardson
Department of Pure Mathematics, University of Sydney, NSW 2006, Australia
ACSNET: jimr@maths.su.oz   Internet: jimr@maths.su.oz.au
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