Arduino sketch that lets you use a PS/2 mouse as a replacement SNES mouse.
Useful if your mouse breaks or if you don't own a mouse, but you own a game that can use a mouse. You could modify it to make a controller version using another type of gamepad, or a TAS playback device.
It requires the "PS2" arduino library: http://playground.arduino.cc/uploads/ComponentLib/ps2.zip