This is day 13 of the Advent Calendar of USB keyboards. Today, a variation on the Commodore 64 USB keyboard.
Tune in tomorrow to open another window on the Advent Calendar of USB keyboards.
This will not work with the C64C or C64 Reloaded boards due to changes to the circuitry used on the restore key. I've designed a new version which adds in additional switching to work with these boards, available soon.