Flipper ROM color codes by system
The two operating-system ("flipper") ROMs live at IC17 and IC20 and are color coded: white for System 3, yellow for System 4, green for System 6 and blue for System 7, with some overlap. The game ROMs hold the rules; the flipper ROMs run the system.
Systems
Related tips
- Which System 3 to 7 games use which flipper ROM system
- Flipper ROM colour tells you the system generation
- "Flipper ROMs" have nothing to do with the flippers
- System 3 CPU board ROM layout
- System 7 CPU ROM sockets
- EPROM types used for System 3 to 7 game code
- System 7 SW1 diagnostic codes
- What System 7 codes often turn out to mean
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)