Picked up a Mr. and Mrs. Pac-Man at SFGE this year. It's my first solid state machine. All of my other games are EM's. I'm having a great time learning about this machine. Anyway, I've been looking over the manual and messing with all of the self-test switch positions. Referring to the switch on the coin door. I've identified what almost all of the 22 positions do. But I can't find anywhere in the manual that says what positions 20 and 21 do. Unless I'm just overlooking it. Does anyone know?