C64 USB Keyboard mod Original by Pyofer See original thread @ http://www.lemon64.com/forum/viewtopic.php?t=55650 Modified to Support restore key & US/EU keymaps by dabone. Wiring is as follows 64 Keyboard connector has 20 Pins with a key Pin @ Pin 2. Arduino Pro Micro Pinout https://cdn.sparkfun.com/assets/9/c/3/c/4/523a1765757b7f5c6e8b4567.png Board type should be Arduino Leonardo (or the Pro mini clones) KeyBoard Arduino Pro Micro 20 2 - SDA 19 3 - SCL 18 4 - A6 17 5 - 16 6 - A7 15 7 - 14 8 - A8 13 9 - A9 12 10 - A10 11 16 - MOSI 10 14 - MISO 9 15 - SCLK 8 18 - A0 7 19 - A1 6 20 - A2 5 21 - A3 4 N/C 3 1 - TXD 2 N/C 1 8 - A8