I have the following dip switch setings
for the memory board for a  NEC RISC Station (a ACER PICA OEM).
Maybe this applies MIPS magnum PC-50 Pica as well.

			Memory Configuration for the NEC RISC Station (NEC OEM ACER)


			Switch	Switch	Switch	Switch	Switch	Switch	Switch	Switch	Switch
Config		1		2		3		4		5		6		7		8		9

Four 4-MB Sticks	Off		Off		Off		On		On		On		On		On		On
Two 8-MB Sticks	Off		Off		Off		Off		Off		Off		On		Off		Off
			Off		Off		Off		On		On		On		On		Off		Off
Four 8-MB Sticks	Off		Off		Off		On		Off		Off		On		Off		Off
Two 16-MB Sticks	Off		Off		Off		Off		Off		Off		Off		On		Off
			Off		Off		Off		On		On		On		Off		On		Off
			Off		Off		Off		On		Off		Off		Off		On		Off
Four 16-MB Sticks	Off		Off		Off		Off		On		Off		Off		On		Off
Two 32-MB Sticks	Off		Off		Off		Off		Off		Off		Off		Off		On
			Off		Off		Off		On		On		On		Off		Off		On
			Off		Off		Off		On		Off		Off		Off		Off		On
			Off		Off		Off		Off		On		Off		Off		Off		On
			Off		Off		Off		Off		Off		On		Off		Off		On


-----Original Message-----
From: port-arc-owner@netbsd.org [mailto:port-arc-owner@netbsd.org]On
Behalf Of M. Warner Losh
Sent: Wednesday, June 19, 2002 7:40 PM
To: crupnik@videotron.ca
Cc: port-arc@netbsd.org
Subject: Re: Acer PICA memory type


In message: <006d01c20bd9$af1f5470$0a01a8c0@PLANETEORANGE.CA>
            "Chris Rupnik" <crupnik@videotron.ca> writes:
:  I have attempted to put the 1X36 (4MB) simms in combinations of 2 and 4
: that were in my MIPS magnum PC-50 into the PICA, but all I get is a memory
: error upon POST
:  The pica page listed here http://assist.acer.com/public/articles/566.htm
: only says
: "MEMORY       :16MB SIMM UPGRADEABLE TO 128MB"
:
: What should I be using instead?

Are you sure they are 1x36 and not 1x32?  I've had problems with
non-parity memory in my Deskstation rPC44, dating from the same
period.  I've also had problems with the new "three chip" designs,
where the "nine chip" designs work w/o a hassle.  I've also had better
luck with 16MB simms than with 4MB ones.  Of course, it doesn't hurt
to have 64MB of RAM in these beasts (but the RAM is so slow that the
benefits of MIPS is wasted due to long waits for memory).

Warner