Working today in Green Valley on the classic 1978 Bally Eight Ball machine. Game turns on, but the computer MPU board will not boot. Checked the diagnostic LED and only a flicker plus two flashes. This means the 5101 RAM chip (or its socket) have failed. Repaired that and found the slingshot coil was fried, as was its driving TIP transistor. Repaired that and re-rubbered and cleaned the playfield. Game was now playing as it should!
