HP-41CL Remote Keyboard / Scripting

[Hans Brueggemann]

it's always a litlle dangerous to jump into solution space too early, but with a HP-41C wand "at hand" it shouldn't be too difficult to connect a keyboard to an arduino and let it decode the keyboard entries into barcode that flashes an LED into the wand to control the HP-41C.
so that would at least free you from reverse engineering the ROM.

now if you want to go via HPIL, J-F's PIL-IO board comes to mind for generating with some extra HW the barcode flashes from HPIL data. why keeping the wand in this picture? afaik, the HP-41C can be HPIL master only, which might be a limitation when trying to take full control over it with a direct HPIL to HPIL connection, say, a HP-75C connected as "keyboard" to the HP-41C.