System 7 CPU ROM sockets
Most System 7 CPU boards are jumpered for three 2716 EPROMs at IC14, IC20 and IC26 and one 2532 at IC17; Defender and Hyperball are jumpered differently. On many boards IC20 is mislabeled, so make sure the 2532 goes in IC17 and the 2716 in IC20.
Systems
Games
Related tips
- System 7 CPU jumpers differ for Hyperball, Defender and Star Light
- Re-jumper a System 7 CPU from Defender/Hyperball/Star Light to a standard game
- System 7 EPROM layout: Hyperball/Defender/Star Light vs other games
- Identifying a System 3 to 7 CPU board
- System 7 CPU board test points
- Which System 3 to 7 games use which flipper ROM system
- 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 One, Clay Harrell (pinrepair.com)