This reminds me of the circa 1990 “HIPPI” interface, or high performance parallel interface. They typically ran at 50 MB/sec. The connectors were two-row 100-pin D style. See http://www.elpeus.com/scsi-cables/100pin-scsi-cable-hippi/3m-100pin-male-to-100pin-male-scsi-cable-hippi/ for example.

We used these cables and connectors on the first Alpha machines at Digital to connect the 3Max front end processor to the ECL based Alpha Demonstration Units, although the protocol was different. The connector was about the biggest that would fit on a TurboChannel I/O card.

On 2020, Feb 27, at 7:04 PM, Dave Horsfall <dave@horsfall.org> wrote:

On Thu, 27 Feb 2020, Adam Thornton wrote:

I recently have pulled out of the trash a plugboard with a male and a female D-Sub 52 connector. 3 rows of pins, 17-18-17. I took the connectors off the board: there's nothing back there, so this thing only ever existed so you could plug the random cable you found into it and its friends to see what the cable fit.

That would be something like a DD-52P (certainly not a DB-52P!).

I can't find much evidence that a 52-pin D-Sub ever existed.

Well, Digikey seem to have them:

http://www.digikey.com/product-detail/en/itt-cannon-llc/2DB-52P/2DB-52P-ND/4734668

No photo, though...

-- Dave_______________________________________________
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