6 Aug
1999
6 Aug
'99
11:48 p.m.
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
(roblwill(a)usaor.net)
ICQ#: 1730318
<http://members.tripod.com/general_1>
-----Original Message-----
From: Olminkhof <jolminkh(a)nsw.bigpond.net.au>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Friday, August 06, 1999 2:11 AM
Subject: Re: IBM PS/2 P70-386 SIMM needed...+ a couple other things...
>
>
>Jason Wrote:
>>I need a 2MB SIMM for an IBM PS/2 P70-386. I know they go in in sets of
>>two's, but for some reason, I have a spare SIMM that I found. Does
anyone
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
10 Aug
10 Aug
6:09 a.m.
On 7 Aug 99 at 18:48, Olminkhof wrote:
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
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
>> 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(a)interlog.com
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10:25 a.m.
On 7 Aug 99 at 18:48, Olminkhof wrote:
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(a)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
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
>>
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jolminkh＠nsw.bigpond.net.au -
lemay＠cs.umn.edu -
lwalker＠mail.interlog.com