HP41C with Rp Pico attached

[ThomasF]

Some progress ...

By adding a single line driver, I'm now able to drive the ISA line, and adding modules are now working.

Next step would be to add a filesystem to the Pico, so .MOD-files could be stored in flash, and then simply selected.

I also tried to modify the System Rom, and that works fine too ...
Just as a crude test I replaced a single character in one of the error messages:
https://photos.app.goo.gl/RvrCzUUGsKxQWMLG8

Code:


                if( address == 016066 ) {
                    drive_data = 001; // Replace character with an 'A'
                    drive_data_flag = 1;
                } else

Cheers,
Thomas