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Article #2315

Helios memory board configuration

#2315
From: Eirik Fuller
Date: Mon, 11 Jan 1993 18:43
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I have a 24 megabyte Helios memory board for the Sun3/100 series, and
unfortunately I didn't get a manual with it.  It is currently set up
so that it provides a 28 meg system with a 4 meg CPU board.  I would
like to use it in a 32 meg system if possible.

It seems as though a 24 meg board should be able to provide either a
28 meg or 32 meg system, depending on how much other memory there is.
I have a 32 meg 3/110 with a 28 meg Clearpoint board, so I know 32
megs with a 3/100 series CPU is possible; I just don't know whether
this Helios board can be configured for a start address of eight megs.
I did find a setting which resulted in a 26 meg system (presumably
intended for 2 meg CPU boards), but I didn't find one for 32 megs.

The part number of the Helios board is ASM 9005-24 (REV A).  The 24 is
written in, not etched into the board, which suggests that the board
was shipped with varying amounts of memory soldered in, and the DIP
switches tell, in part, how much of it is present.  Based on my
experiments, at least one of them seems to specify a starting address.

What I would like is either a way of telling the Helios board to use
the last 24 of 32 megs of memory, or a way of telling my 4 meg SCSI
board to use the last 4 of 32 megs (but the latter seems unlikely).
The part number of the Sun memory board is 501-1122.
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Message-ID: <1993Jan11.184356.17347@tc.cornell.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!rpi!batcomputer!bouncer

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Newsgroups: comp.sys.sun.hardware
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!rpi!batcomputer!bouncer
From: eirik@elf.TN.Cornell.EDU (Eirik Fuller)
Subject: Helios memory board configuration
Message-ID: <1993Jan11.184356.17347@tc.cornell.edu>
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Organization: Cornell Theory Center
Date: Mon, 11 Jan 1993 18:43:56 GMT
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