Convert Sega Saturn controller to USB HID joypad using Arduino Leonardo / Pro Micro.
Install from Arduino library manager.
Saturn Arduiono Pro Micro
1 - VCC - blue 5V
2 - D1 - green D3
3 - D0 - black D2
4 - S0 - orange D8
5 - S1 - red D9
6 - VCC - brown -
7 - D3 - yellow D6
8 - D2 - gray D4
9 - GND - white GND
Enjoy!