HP-97s card reader inquiry

[teenix]

(11-25-2020 02:16 AM)[kby] Wrote:  Figured out my problem, although still interested in knowing what the logic is. Problem was the ribbon cable was inserted shifted over a bit so many contacts on the cable bridged two contacts in the connector.

I posted an oscilloscope image of the card reader signals here. It is for a 65, but the 67 is the same.

https://www.hpmuseum.org/forum/thread-15...#pid139076

Hopefully helps with the answer.

cheers

Tony