A doubled System 3-6 Leon image in a 2532 runs on any board
If only one EPROM can be burned, put two copies of the System 3-6 Leon code into a 2532; older boards ignore the extra address space and it also runs on System 7. On System 7 the memory test will not work, because System 7 RAM sits at $0000-$0100 rather than $0080-$0100.
Systems
Related tips
- A System 7 CPU board can run any System 3 to 7 game
- Run a System 6/7 CPU board on +5 V only
- Which CPU boards can run which system firmware
- System 7: the 2532 goes in IC17, the 2716 in IC20
- Run the System 3-6 built-in CPU test (SW1)
- Use a 2732 instead of a 2532 at U17 on a System 7 CPU board
- Chips a System 7 CPU board needs to run the Williams test ROM
- System 7 diagnostic display stays lit on a working game
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)