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HP-91 ROM - Printable Version

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HP-91 ROM - PANAMATIK - 07-01-2017 07:38 PM

For the first time I extracted the original HP-91 ROM code from the calculator.

I did not own an HP-91, but reading its ROM from an original machine was possible due to a friendly member, who gave me his HP-91 some weeks ago for this purpose. Surprisingly it has only 3k words including the printer firmware. But without card reader and being a "non programmable" machine, this is obviously sufficient.


The HP-91 is the Low End desktop printer calculator of the "Topcat" models.

Any HP-92 for me?