+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: Cardreader HP67, 4 Switches 3 Contacts? (/thread-18430.html)
Cardreader HP67, 4 Switches 3 Contacts? - TorstenHamburg - 06-02-2022 06:06 PM
Many thanks for the hardly wellcome!
This is my first thread in this forum.
I am working on my 1997 HP76 Cardreader.
According to the 4 contact fingers aktuated by the nylon-balls i only find 3 signals on the card reader control-IC:
1. Card at reader head (HDS)
2. Card reader motor switch (MTRS)
3. Card reader write protect switch (CPS)
What is the 4. contact used for?
Regards from Hamburg/Germany
Torsten
RE: Cardreader HP67, 4 Switches 3 Contacts? - teenix - 06-02-2022 11:56 PM
It is not used
cheers
Tony