HP-32E with errors ...

[PANAMATIK]

(04-28-2021 01:26 PM)rprosperi Wrote:  You'll have to wait for Panamatik to weigh-in for a definitive answer, but it appears the ROM is either damaged or possibly has a bad pin connection?

Is RAM intact? Are values stored in the stack and storage registers preserved when doing various operations?

Obviously I cannot give a definitive answer. But I also think, and you figured it out already, that a defective ROM should be the problem.

I have an HP-25C, which is still calculating, but shows a similar effect, it produces wrong results when using SIN COS TAN etc. I found, by reading the ROMs and comparing, that only one bit of one instruction was flipped.

interestingy I have the HP-32 ROMs here in my spare parts box, because I upgraded my HP-32E to an HP-32E SPICE LP. Possibly your calculator could be repaired by them.

Bernhard