This is day 16 of the Advent Calendar of USB keyboards. Today, a revision of the Commodore 64 USB keyboard, adding dual USB joysticks.
fits inside a working C64 to share it's keyboard when the C64 is switched off.
Tune in tomorrow to open another window on the Advent Calendar of USB keyboards.
You can now buy a kit of the new version of this board, from my Tindie Store.