A System 7 CPU board can run any System 3 to 7 game
The System 7 board drives six- or seven-digit displays and runs code from every earlier system. For a System 3, 4 or 6 game, join that game's two 2716 flipper ROM images into one 2532 (the IC20 image first, then the IC17 image) and fit it at IC17, keep the game's 2716 at IC14, and remove the other EPROMs. No jumper change is needed unless the board is set up for Hyperball or Defender. Firepower needs its own set.
Systems
Related tips
- System 7: the 2532 goes in IC17, the 2716 in IC20
- Leon's test EPROM: what to burn and where it goes
- Run a System 6/7 CPU board on +5 V only
- Which CPU boards can run which system firmware
- Run the System 3-6 built-in CPU test (SW1)
- Identifying a System 3 to 7 CPU board
- What changed on the System 6A CPU board
- System 6 CPU board test points
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)