HP41C with Rp Pico attached

[MeindertKuipers]

Just a brief update, I can now succesfully emulate ROMs with my RP2040 setup, using the PIO as the main handler of the HP41 interface. Tested with the HP41CX and 41CL.
Next step is to emulate QRAM, which means that I need to decode the WROM instruction and take bits from the DATA line. I can already monitor DATA so I expect no big issues here. When this is working I will prepare a (software) package for friends here who want to play with this setup as well. Needed are the RP2040 Pico board (and a second Pico for the debugger is recommended) plus a breadboard with level shifters.

Many thanks to Andrew for inspiring this project.