I am trying to revive an HP85B to use as a controller for an old V curve tracer. The tape drive seems to be OK and has a good capstan roller, but it gives a STALL error 74 every time I issue a CAT, CTAPE or ERASETAPE command. I managed to find a second tape drive and that one gives the same error. The tape indicator light comes on (briefly) and the tape give a little jump and then the error occurs. Anybody got any ideas about what is going on and how to fix it?
HP 85B tape drive
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