Regarding 32 pin simms. was [plug] 1Mb 31 pin simms reqd

[Phillip Summers]

Yes Chris, the 31 one pin simms were a proprietory format introduced by IBM
but never took off. They are particularily hard to get hold of. It was
indeed lucky to pick up ten matched simms from Leon. Unlike typical 32 pin
simms which use a 16 + 16 (=32) bit bus, the IBM ones use 16 + 15 (=31) bit
bus. Some clever cookie at IBM worked out a way to synthesize the last bit
in hardware on the motherboard. Probably in the same way as some more
expensive machine have parity generating hardware. I beleive they became
unviable when Intel started producing the 486. The higher clock speed of the
486 was able to outpace the ability of the IBM hardware to guess the value
of the last bit.

Regards Phil.

-----Original Message-----
From: Chris Cornish <linuxcw at yahoo.com.au>
To: plug at linux.org.au <plug at linux.org.au>
Date: Friday, 2 April 1999 10:12
Subject: Re: [plug] 1Mb 31 pin simms reqd


>31 pin memory ? i have never heard of this correct me if I'm wrong do
>you mean 32 pin or is 31 a special M$ format for memory  for 31 bit OS's
>;p
>
>--- Leon Brooks <leon at brooks.smileys.net> wrote:
>> Phillip Summers wrote:
>> > If anyone has some 1Mb 31 pin simms that they don't
>> want would they kindly
>> > drop me a line.
>>
>> here 'tis:
>> ------------------------------------------------------------
>>
>> (-:
>>
>> 0411-655-020
>>
>> --
>> Anyone who conducts an argument by appealing to
>> authority is not using
>> his intelligence; he is just using his memory. --
>> Leonardo da Vinci
>>
>
>
>===
>Chris Cornish
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