Which System 3 to 7 games use which flipper ROM system

System 3: Contact, Disco Fever, Hot Tip, Lucky Seven, World Cup (custom). System 4: Stellar Wars. System 6: Algar, Alien Poker, Blackout, Firepower, Flash (later production), Gorgar, Laser Ball, Scorpion, Time Warp, Tri Zone. System 7: Barracora, Black Knight, Cosmic Gunfight, Defender, Firepower II, Hyperball, Joust, Jungle Lord, Laser Cue, Solar Fire, Star Light, Time Fantasy, Varkon, Warlok.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Flipper ROM color codes by system
• "Flipper ROMs" have nothing to do with the flippers
• Flipper ROM colour tells you the system generation
• System 3 CPU board ROM layout
• System 7 CPU ROM sockets
• System 4 CPU board changes and ROM layout
• System 6 CPU board changes and ROM layout
• Flipper ROMs at IC17 and IC20: replace the originals with new EPROMs

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)