Button one is wired to pin 6 of the DB9 connector, this is standard for most retro computers. I have also added an extra button.
Sega Mega Drive / Genesis Controller Pad to Amiga And Commodore 64 C64 Adapter
COMMODORE 64 "SOME RARE" CASSETTE GAMES (25+ DIFFERENT GAMES) MOST TESTED
COMMODORE 64 "SOME RARE" CASSETTE GAMES (28+DIFFERENT GAMES + A CARTRIDGE) USED
COMMODORE 64/128 "RARE" CASSETTE GAME (KLAX) 1980`s/TESTED WORKING
COMMODORE 64 "RARE" CASSETTE GAME (BARBARIAN 2) 1989/TESTED WORKING/RARE GAME
COMMODORE 64 "VERY RARE" CASSETTE GAME (JOUSTE) 1984/TESTED WORKING/RARE GAME
