Strange HP-31E Function

[PANAMATIK]

(10-16-2016 02:55 PM)Katie Wasserman Wrote:  I agree and I'm pretty sure that the Spice self test does a checksum of the ROM, so it should fail on AJ's 31E.

As the 31E passes the selftest, I'm not longer sure about the ROM bit error theory. Perhaps it is a fault of some register in the arithmetik logic unit. For test purpose and if it is a solderless version, the 40-pin chip can be easily replaced by one from another spice model.

Bernhard