Possible replacement for a CRC

[Kostas Kritsilas]

From what I know, the HP-41's card reader can read HP-67 cards (and it does some translation magic between the HP-67 programs and the HP-41's programs). It seems logical that the HP-41 should be able to verify the HP-67 card's CRC to ensure that there isn't a read error. The algorithms for calculating/verifying the CRC codes for both machines are present in the IC that does that. I think that most likely, because both sets of calculations are present (and only one is in the HP-67's equivalent IC), and the completely different CPUs of the HP-67 and HP-41, that the ICs themselves would not interchange. I remember reading that some of the mechanical parts are common (and somewhat improved on the HP-41 card reader), but the electronics (all of the electronics) are completely different.