Bally/Stern Arduino Kit (Plug and Play) - Troxel Repair
Bally Mata Hari pinball, repair #5 | Michigan Pinball - We Buy Pinball Games
PINBALL: Repairing Bally, Stern Pinball Games 1977-1985, part two
MPU SETUP INO - Pinball Electronics from barakandl
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.