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
Atari 5200 4-Port Switchbox Bypass Modification & Cap Kit
patch bay Archives - Sam Vs. Sound
PINBALL Repair EM Electro Mechanical Arcade Games (pinball, pitch and bat, bowlers), part three