Games built on System 4
System 4: Phoenix (11/78, #485), Pokerino (12/78, #488, wide body), Flash (1/79, #486, first with continuous background sound) and Stellar Wars (3/79, #490, wide body). Late-built Flash and Stellar Wars games shipped with System 6 boards.
Systems
Games
Related tips
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)