Nope. No free slot. The long slot has an IBM 3363 controller in it, and
the other slot won't accept a long cart, because it hits the cooling fan.
Anyone know what the short slot's for?
Yes, I do have the reverence disk. The P70 has 4 SIMM slots.
From: Lawrence LeMay <lemay(a)cs.umn.edu>
To: Discussion re-collecting of classic computers
Date: Tuesday, August 10, 1999 11:33 AM
Subject: Re: IBM PS/2 P70-386 SIMM needed...+ a couple other things...
> On 7 Aug 99 at 18:48, Olminkhof wrote:
> > >Basically what I meant is banks of two. There's two SIMMS in a bank,
> > 2
> > >banks, totaling 4 SIMMS.
> > >
> > >If you install three 2 MB SIMMS, instead of getting a 6 MB memory
> > >you'll get a 4 MB reading and a
> > >
> > Nope.
> > You'll get a memory error until you run the reference disk. If you have
> > error while running the reference disk then
you have the wrong type of
> > simms.
> > It's not until you get to Pentiums that you need 72pin simms in pairs.
> > >///--->>>
> > > -Jason Willgruber
> > >>
> > >>I've never heard of this "sets of 2" stuff on these.
> > >>They use the same simms as the desktop model 70 . . ie with
> > >>detect circuitry.
> > >>
> > >>Hans
> > >>
> TMK most IBMs (as well as Ataris, Macs and NEXT) require matching simms
> pairs, and as well presence detect in the case of
MCA. There is a
> to get around the P.D. on Peter Wendts site. While
I have never tried to
> single simm physically except to expand the
onboard memory of my 8580 to
> from 2 , IIRC all the docs mention this. I would
certainly be delighted
> this were not so. I have an IBM 486 Ambra
(non-MCA) which also requires
> in pairs but doesn't require PD and a single
spare non-IBM 8meg which
> unused because of this limitation. I have an 8570
A-21 desktop (25mhz and
> co-processor) and other PS2s. There is also a 16
meg max limitation on
the PS2s altho
there are workarounds for this I understand.
I thought that at least one of the PS/2 model 70 motherboard versions came
with 3 simm slots... I dont recall it needing simms in pairs on the
motherboard, though it does use a non-standard, PS/2 style presence
Does the original poster have a free MCA slot for a ram expansion board?
I have one for a PS/2 model 70, that I assume would work in your system,
assuming you have the reference diskette for your machine.