[vcf-midatlantic] S-100 protoboards
hjohnson at retrotechnology.info
Fri Jan 14 18:23:45 UTC 2022
>> It's not appreciated, that S-100 PC mount
>> connectors came in two pin-widths between the two rows. Different brands
>> of backplanes used one or the other. It's a gotcha to buy the wrong
>> width connectors for a particular unpopulated backplane.
>> Regards, Herb Johnson
> It was my understanding that only the Altair backplane had a different row
> spacing for it's connectors. Everything that I have seen since (IMSAI,
> Ithaca, TEI, CompuPro, Cromemco) used the same .250 row spacing.
> Regards, Jeff
Well, maybe I didn't state the situation clearly. It takes a little
longer to do so, I didn't want to go off on details, on side issues to
another topic that has already ended. So I'll make a simple point.
There's all kinds of 100 pin connectors one might buy, which won't
likely be labeled "S-100". You have to measure the pin spacing anyway -
which for all S-100 cards is 8 pins per inch. .125 inches apart.
So you may as well, check *your particular motherboard* that you are
buying connectors for, *just* to be sure the the particular connectors
you are buying, match the pin row-width also. That will be,
whateverthehell it is, because there were any number of S-100
card-producers, who made backplanes, with whatever connectors they
Just check all your measurements, to avoid getting the wrong part.
That's all I was saying. It's factually been a problem.
Regards again, Herb
Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
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