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From: makela@tukki.jyu.fi (Otto J. Makela)
Newsgroups: comp.unix.microport
Subject: Memory expansion problems
Summary: machine crashes when memory goes from 4M -> 9M
Keywords: Unisys Acer memory expansion
Message-ID: <589@tukki.jyu.fi>
Date: 27 Apr 89 03:59:16 GMT
Reply-To: makela@tukki.jyu.fi (Otto J. Makela)
Organization: Grand Hall of Justice, Mega-City One
Lines: 26

I use a Unisys 800 (same as the Acer 1100) 20MHz 386 PC/AT clone under
MicroPort UNIX/386 3.0U3.0e; the system has 4992k of 80ns memory (640k+
256k on motherboard + 4096k on a 32-bit expansion board).

I installed an extra 4096k piggyback card onto the expansion board to get
to a total of 9088k memory.  I set the DIP switches, plugged the card in,
powered up the machine and used the BIOS ROM setup to change the CMOS
count of memory above 1M.
I booted DOS and ran the machine's diagnostics on the memory board, and
it checked out as OK (the test did only take about an hour, though...)

Then I tried booting the Unix from the ESDI hard disk.  Right after it had
said "Ram disk 0 found.  size=32Kb" (what the s**t is this, by the way?
I've seen it being used at system build time, but for nothing else...)
it went into an endless loop of:
	"Could not allocate memory for default 0 buffers"...
(the next thing I normally see is "buffers=1400k" or something like that).

Does anyone know what's happening here?  Is the weirding module incorrectly
tuned or what?

Otto J. Makela (with poetic license to kill), University of Jyvaskyla

InterNet: makela@tukki.jyu.fi, BitNet: MAKELA_OTTO_@FINJYU.BITNET
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Mail: Kauppakatu 1 B 18, SF-40100 Jyvaskyla, Finland, EUROPE