MPU 100/200 battery board for Bally/Stern games – No Quarters Arcade
AlltekSystems
PINBALL: Repair Bally 6803 Pinball Games 1985-1989.
In Progress - A Big Box of Bally Boards | Pinball info
PINBALL: Repairing Bally, Stern Pinball Games 1977-1985, part three
I recoded my Stern Stars (1978) by replacing the processor with an Arduino Nano, and created a generic Bally/Stern OS you can use to make new rules for your early SS Bally/Stern
PINBALL: Repair Bally 6803 Pinball Games 1985-1989.