Anyone recognize this bus/form factor?

Eric Smith spacewar at
Thu Sep 24 14:05:03 CDT 2015

On Thu, Sep 24, 2015 at 8:06 AM, Mike Stein <mhs.stein at> wrote:
> Wonder why that type of connector wasn't used more often for a bus instead
> of presumably more expensive edge connectors;

Lower cost is why that style of connector was chosen by SWTPC for the
SS-50 bus, and by Ohio Scientific for their bus, though the board in
your photo clearly doesn't match either of those.

> I think I do have some (CDC?)
> boards that are the opposite, i.e. pins plugging into sockets on the
> backplane.

Interesting. With that style of connector, it's relatively easy for
the male pins to get damages, and not so much for the sockets. The
"backwards" approach has the advantage of protecting the backplane
pins better, since those are harder to replace.

More information about the cctalk mailing list