Arduino-USB-HID-RetroJoystickAdapter/Keyboard_PS2

PS/2 keyboard as 4 USB-joysticks

Needs Atmega32u4 (e.g. Arduino Leonardo).

Needs custom ps2-library (PS2Keyboard_mcgurk.zip, unzip to libraries-folder).

Clock-signal must be in pin 2 (because of interrupts).

Edit button assignments manually.

#define DEBUG if you want to see codes in console.

Joystick 1:

arrows = up/down/left/right
R-ctrl = a
alt gr = b
enter = start
R-shift = select

Joystick 2:

W/S/A/D = up/down/left/right
L-ctrl = a
L-alt = b
tab = start
L-shift = select

Links

http://playground.arduino.cc/Main/PS2Keyboard

http://www.computer-engineering.org/ps2protocol/

http://www.computer-engineering.org/ps2keyboard/scancodes2.html