Flipper ROM colours: white, yellow, green and blue

Each flipper ROM version is known by a colour, after the label on the original chips: white for System 3, yellow for System 4, green for System 6 and blue for System 7. The game ROM at IC14 must be the version written for the flipper ROM colour fitted; for example a green (System 6) game such as Firepower will not run on yellow flipper ROMs.

Systems

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

Related tips

• Flash has yellow and green game ROM versions; match them to the flipper ROMs
• Only Stellar Wars and Flash used yellow flipper ROMs
• Flipper ROM colour tells you the system generation
• "Flipper ROMs" have nothing to do with the flippers
• Which System 3 to 7 games use which flipper ROM system
• Flipper ROM color codes by system
• Reading audit 00: game number, flipper ROM version and software revision
• LEDs flicker then stay on: flipper or game ROM problem

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