System 3/4 sound board jumpers for 7641 PROM vs 2716
The cabinet-mounted System 3/4 sound board jumpers only set the ROM type at IC2. Reading the bottom edge from the left, the order is J11, J12, J14, then J13, J16, J15, then J17, J18. For a 512-byte 7641 PROM fit J11, J14, J16 and J18. For a 2316 ROM or 2716 EPROM fit J12, J13, J15 and J17. Without re-jumpering, a 2716 can replace a 7641 if its pin 21 is bent out and wired to pin 24.
Systems
Related tips
- Leon sound board test EPROM
- Garbled or partial sounds from bad ROMs or sockets
- System 4, 6 and 7 boards: one 2716 at IC14 replaces the three game PROMs
- System 7: the 2532 goes in IC17, the 2716 in IC20
- Convert a System 3 CPU board to a single 2716 game EPROM at IC14
- How System 3-6 games trigger sounds
- Run Firepower on a System 7 CPU board
- Flipper ROMs at IC17 and IC20: replace the originals with new EPROMs
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)