The genesis pad registers as a 2 button joypad in the Amiga without any modding, my pad had a dirty connector for the 3rd button though so might actually work as a 3 button one, not sure. Anyway I ripped out the IC and resistors inside and connected the whires directly as the Amiga wants it and then added autofire to the start button aswell. After removing all SEGA text and logos from it this is now a pritty sweet joypad to use. :-D