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computers / comp.sys.ibm.ps2.hardware / Where is my list of 30 pin SIMM PD?Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

SubjectAuthor
* Auction: Defective IBM 61X6752 Microchannel Memory Expansion CardLouis Ohland
`* Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion CardWBSTClarke
 `* Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion CardWBSTClarke
  `- Where is my list of 30 pin SIMM PD?Re: Auction: Defective IBM 61X6752Louis Ohland

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Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card
with 18MB Memory AS-IS
Date: Sat, 27 Nov 2021 15:21:41 -0600
Organization: csiph.com Internet News Service
Message-ID: <snu7jj$10im$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>
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 by: Louis Ohland - Sat, 27 Nov 2021 21:21 UTC

https://www.ebay.com/itm/265403130688

BIN / MAO

I'm not czeching on the particulars, but this card could not handle "18MB"

Each SIMM has 9 OKI M41256, 256KBx1 DRAM. So, that would be 8 total
256KB SIMMs, total 2MB?

https://ardent-tool.com/memory/IBM_Memory_Expansion.html#1_8MB

Is it truly defective, or is that they tried it inan incompatible system?

Chances are that it works.

Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

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Subject: Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card
with 18MB Memory AS-IS
From: wbstclarke@gmail.com (WBSTClarke)
Injection-Date: Tue, 30 Nov 2021 02:09:40 +0000
Content-Type: text/plain; charset="UTF-8"
 by: WBSTClarke - Tue, 30 Nov 2021 02:09 UTC

On Saturday, 27 November 2021 at 21:23:01 UTC, Louis Ohland wrote:
> https://www.ebay.com/itm/265403130688
>
> BIN / MAO
>
> I'm not czeching on the particulars, but this card could not handle "18MB"
>
> Each SIMM has 9 OKI M41256, 256KBx1 DRAM. So, that would be 8 total
> 256KB SIMMs, total 2MB?
>
> https://ardent-tool.com/memory/IBM_Memory_Expansion.html#1_8MB
>
> Is it truly defective, or is that they tried it inan incompatible system?
>
> Chances are that it works.

Sadly, IBM had their own "presence detection" arrangement for 30-pin SIMMs of 256KB or 1MB capacity (with Parity and gold-plated contacts). So-called "Industry Standard" SIMMs will be mis-identified as to capacity etc.

Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

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Subject: Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card
with 18MB Memory AS-IS
From: wbstclarke@gmail.com (WBSTClarke)
Injection-Date: Tue, 30 Nov 2021 02:10:15 +0000
Content-Type: text/plain; charset="UTF-8"
 by: WBSTClarke - Tue, 30 Nov 2021 02:10 UTC

On Tuesday, 30 November 2021 at 02:09:40 UTC, WBSTClarke wrote:
> On Saturday, 27 November 2021 at 21:23:01 UTC, Louis Ohland wrote:
> > https://www.ebay.com/itm/265403130688
> >
> > BIN / MAO
> >
> > I'm not czeching on the particulars, but this card could not handle "18MB"
> >
> > Each SIMM has 9 OKI M41256, 256KBx1 DRAM. So, that would be 8 total
> > 256KB SIMMs, total 2MB?
> >
> > https://ardent-tool.com/memory/IBM_Memory_Expansion.html#1_8MB
> >
> > Is it truly defective, or is that they tried it inan incompatible system?
> >
> > Chances are that it works.
> Sadly, IBM had their own "presence detection" arrangement for 30-pin SIMMs of 256KB or 1MB capacity (with Parity and gold-plated contacts). So-called "Industry Standard" SIMMs will be mis-identified as to capacity etc.

http://john.ccac.rwth-aachen.de:8000/misc/ps2cache/

Where is my list of 30 pin SIMM PD?Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

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From: ohland@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Where is my list of 30 pin SIMM PD?Re: Auction: Defective IBM 61X6752
Microchannel Memory Expansion Card with 18MB Memory AS-IS
Date: Mon, 29 Nov 2021 20:29:37 -0600
Organization: csiph.com Internet News Service
Message-ID: <so42d2$274r$1@842ffb22-07e1-11e5-a459-00266cf00584.csiph.com>
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 by: Louis Ohland - Tue, 30 Nov 2021 02:29 UTC

Page 5 of the Mar 93 HMM has only a graphical depiction of the
individual chips on a 30 pin SIMM.

On 11/29/2021 20:10, WBSTClarke wrote:
> On Tuesday, 30 November 2021 at 02:09:40 UTC, WBSTClarke wrote:
>> On Saturday, 27 November 2021 at 21:23:01 UTC, Louis Ohland wrote:
>>> https://www.ebay.com/itm/265403130688
>>>
>>> BIN / MAO
>>>
>>> I'm not czeching on the particulars, but this card could not handle "18MB"
>>>
>>> Each SIMM has 9 OKI M41256, 256KBx1 DRAM. So, that would be 8 total
>>> 256KB SIMMs, total 2MB?
>>>
>>> https://ardent-tool.com/memory/IBM_Memory_Expansion.html#1_8MB
>>>
>>> Is it truly defective, or is that they tried it inan incompatible system?
>>>
>>> Chances are that it works.
>> Sadly, IBM had their own "presence detection" arrangement for 30-pin SIMMs of 256KB or 1MB capacity (with Parity and gold-plated contacts). So-called "Industry Standard" SIMMs will be mis-identified as to capacity etc.
>
> http://john.ccac.rwth-aachen.de:8000/misc/ps2cache/
>

computers / comp.sys.ibm.ps2.hardware / Where is my list of 30 pin SIMM PD?Re: Auction: Defective IBM 61X6752 Microchannel Memory Expansion Card with 18MB Memory AS-IS

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