The app was written in Python and started out for the HP-45 (ROM is included) but finally included also the HP-35 and the HP-80, as well as three others. For macOS and Windows you could just run the included executables, or with the Python code, this will run fine on Linux if you have Python installed. Nice thing is that you can also modify or tweak the Python code if you wish.
As she states, this is not a "how to learn HP or RPN" but there is a lot of included online help, and the original HP manuals are available online.
What an amazing resource for anyone wanting to learn more about the inner workings of these legendary calculators.
See
https://sarahkmarr.com/retrohp1973.html
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