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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 purchased. 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 preserve, recover, restore 1970's computing email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT comcast DOT net