The C64 JoyKEY was born out of the desire to build my own joystick, and after having a look at the various options available I chose to build one using Cherry MX keyboard switches. They are around a dollar per piece, so after getting it all to work properly on my beloved Commodore 64 I looked into using it with a whole selection of vintage computer systems as well. There are two main versions of the C64 JoyKEY, the keyboard-variant already described and a board designed for use with Sanwa arcade parts instead.