I suspect this allows more expanded terminal
connections to a classic (i.e.
stack architecture) HP3000 beyond what you would normally have via an ATP.
ATP is the hardware for serial terminal connections. On the Series 64/68/70
there was a bulkhead for this in the main CPU cabinet. Maybe this is for a
Series 44/48/58?
Never saw one before.
...I've passed the link/question on to Chuck Shimada.
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I think I saw several of these sitting in the back room of Excess Solutions
Had no idea what they were either.