I have recently purchased an HP67 from Ebay.
It is acting real weird in programming mode.
For the first seven programme steps every line is the same - 001 31 25 24 - no matter what keys you press. After the seventh line all keys act correctly. It isn't a sticking key because it rights itself always after the seventh line.
It does it every time. It seems to me like the programming gets in a tangle for a while. I have tried shorting across the two battery terminals (without batteries in) Don't some HPs get static build up or something. Anyway it has not fixed it.
It does this so regularly and behaves normally that I think it must be something simple like set flags or something like that.
It seems to do this after loading a pre-programmed card as well.
Help!!! It is driving me nuts.
Programming HP67
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