My collection of PICO powered retro keyboards
My video https://youtu.be/a0VU5mklIbk
To use these scripts you will need Circuit Python KMK Firmware https://circuitpython.org/ https://github.com/KMKfw/kmk_firmware
rename the file you want to code.py and copy over to the PICO after installing KMK firmware. These are all setup for MiSTerFPGA cores with the keys as best as I can, the Spectrum core only uses the keys from the rubber keyboard.
I have included my PCB for the BBC project and you can find the files for that at https://github.com/ajparsons/bbc-micro-keyboard The AMiga 600 I mention in the video can be found at https://github.com/thinghacker/Amiga600KeyboardUSBAdapter