Leon's test EPROM: what to burn and where it goes
Leon's test EPROM lets the CPU board run without the driver board. Burn it into a 2716 for System 3 to 6 boards or a 2532 for System 7, and fit it in the flipper ROM socket IC17. It runs even with the other ROMs fitted, but remove IC14, IC20 (and any at IC21, IC22, IC26) so a shorted ROM cannot lock the bus.
Systems
Related tips
- System 7: the 2532 goes in IC17, the 2716 in IC20
- Run Firepower on a System 7 CPU board
- Garbled or partial sounds from bad ROMs or sockets
- Flipper ROMs at IC17 and IC20: replace the originals with new EPROMs
- Convert a System 3 CPU board to a single 2716 game EPROM at IC14
- System 4, 6 and 7 boards: one 2716 at IC14 replaces the three game PROMs
- A System 7 CPU board can run any System 3 to 7 game
- Seven-digit scoring on six-digit displays for green-ROM games
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)