Tag: external keyboard

Adds a buffered external C128D keyboard connection to a Commodore 64 while retaining the original keyboard.

The surviving workshop page provides a schematic, pin map, parts list, and verified build instructions, but no PCB files, kit, or explicit reuse license. It warns that a direct long-cable connection can overload and destroy the C64 CIA. The buffered design was intended for cables as long as 10 meters, although its troubleshooting section still recommends shortening a troublesome cable to about one meter.

Lets a detachable Commodore 128D keyboard serve as the keyboard for a Commodore 64.

Protovision listed 17 units from EUR 15 with a one- to two-week shipping estimate on 2026-07-30. Its news page says versions are available with or without an extension cable. Human review found no visible active components or additional documentation, but that does not prove the board is unbuffered. Ask the seller about buffering and safe cable length before using a long cable, and connect or disconnect the adapter only while the computer is powered off.