Anyone recognize this bus/form factor?

Chris Elmquist chrise at
Thu Sep 24 10:23:55 CDT 2015

On Thursday (09/24/2015 at 10:06AM -0400), Mike Stein wrote:
> Found a few more boards; I guess the displays, optocouplers and surge
> suppressors suggest an industrial system of some sort, perhaps custom or
> limited production.
> Wonder why that type of connector wasn't used more often for a bus instead
> of presumably more expensive edge connectors; I think I do have some (CDC?)
> boards that are the opposite, i.e. pins plugging into sockets on the
> backplane.

Those are the same connectors used on the Heathkit H8 and H89 backplanes
but those are definitely not cards that plug into the backplane of either
of those machines.

Chris Elmquist

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