HP41C with Rp Pico attached

[MeindertKuipers]

Just a brief update on progress with the RP2040 attached to an HP41.
I have been able to emulate Extended Memory on the Pico (connected to my HP41CX), at the same time as emulating QRAM and ROM.
Today I have been able to get HP82143A printer emulation working in a first phase. I can simulate power ON/OFF of the printer and actually print (to a terminal emulator) some text. Next is to implement the printmodes and pressing the PRINT and ADV keys, and check printing into the PC-based HP82143A simulator (including graphics). This now means that I can reliably transfer the DATA register to and from the calculator, set the CPU carry (when asked by the NUT) and switch the calculator on when in deep or light sleep.