IBM PS/2 P70-386 SIMM needed...+ a couple other things...

From: Jason <roblwill_at_usaor.net>
Date: Wed Jan 13 16:41:12 1999

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.
///--->>>
                -Jason Willgruber
               (roblwill_at_usaor.net)
                   ICQ#: 1730318
<http://members.tripod.com/general_1>

-----Original Message-----
From: Lawrence LeMay <lemay_at_cs.umn.edu>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
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,
with
>> > 2
>> > >banks, totaling 4 SIMMS.
>> > >
>> > >If you install three 2 MB SIMMS, instead of getting a 6 MB memory
reading,
>> > >you'll get a 4 MB reading and a memory error.
>> > >
>> >
>> >
>> > Nope.
>> >
>> > You'll get a memory error until you run the reference disk. If you have
an
>> > 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
presence
>> > >>detect circuitry.
>> > >>
>> > >>Hans
>> > >>
>>
>> TMK most IBMs (as well as Ataris, Macs and NEXT) require matching simms
in
>> pairs, and as well presence detect in the case of MCA. There is a
hardware hack
>> to get around the P.D. on Peter Wendts site. While I have never tried to
add a
>> single simm physically except to expand the onboard memory of my 8580 to
4m
>> from 2 , IIRC all the docs mention this. I would certainly be delighted
if
>> this were not so. I have an IBM 486 Ambra (non-MCA) which also requires
memory
>> in pairs but doesn't require PD and a single spare non-IBM 8meg which
sits
>> unused because of this limitation. I have an 8570 A-21 desktop (25mhz and
387
>> co-processor) and other PS2s. There is also a 16 meg max limitation on
most of
>> the PS2s altho there are workarounds for this I understand.
>>
>> ciao larry
>> lwalker_at_interlog.com
>>
>
>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
>detect.
>
>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.
>
>-Lawrence LeMay
>
Received on Wed Jan 13 1999 - 16:41:12 GMT

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