Williams/Bally games by CPU system (to 1992)

System 9 covers Space Shuttle, Sorcerer, Comet and Strike Zone. Plain System 11 covers High Speed, Grand Lizard, Road Kings and Alley Cats. 11A covers Pinbot, Millionaire, Fire!, F-14 Tomcat and Tic Tac Strike, with Big Guns on 11A or 11B. 11B runs from Space Station to Shuffle Inn Deluxe, including Cyclone, Taxi, Earthshaker, Black Knight 2000, Police Force, Elvira and Whirlwind. 11C covers Game Show, Diner, Radical, Pool Sharks, Roller Games, Riverboat and Bugs Bunny, with Dr. Dude on 11C or WPC. Electronic flippers start with The Addams Family.

Systems

• Williams System 9
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer