Old GameCube usb adapter:
http://www.play-asia.com/super-joybox-13-game-cube-to-pc-usb-controller-adapter/13/702ou
controller.ini
[SUPER JOYBOX 13]
VID=0926
PID=8888
Polltype=1
DPAD=1
DigitalLR=0
Power=0,C1
A=0,01
B=0,02
X=0,04
Y=0,08
Z=0,40
L=0,10
R=0,20
S=0,80
Left=1,60
Down=1,40...