@Helios the HAS is chamma compatible, but your IO is not. You need to hook up the kick harness connector to get button 6 to work. And you need to disable button 6 on the HAS otherwise it will always be pressed (button 6 to ground). On HAS it's JST XH 6 pin, and on the IO side it's a 14 pin JST NH. You need pin 4 and 8 for P1 B6 and P2 B6.