CPU DIP switches: used by System 3, ignored from System 4 on
System 3 games set their adjustments with the two 8-position DIP banks on the CPU board. From System 4 on, adjustments are made in software from the coin door and the DIPs are ignored, so set all 16 to off. A System 3 game run on a System 7 board still needs the DIPs, and many System 7 boards were built without them fitted.
Systems
Related tips
- Late System 7 CPU boards lack LEDs and DIP switches
- Identifying a System 3 to 7 CPU board
- What changed on the System 6A CPU board
- System 6 CPU board test points
- System 7 CPU board test points
- System 6 CPU board jumpers J1 to J6
- A System 7 CPU board can run any System 3 to 7 game
- Run a System 6/7 CPU board on +5 V only
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)