System 6/7 sound board can take a 6802 in place of the 6808 and 6810
The sound board's 6808 CPU and its 6810 RAM at IC11 can be replaced by a single 6802. First cut the trace under R30 on the solder side; the pull-up for the swap is already fitted but is tied to ground until that trace is cut.
Systems
Related tips
- All sounds suddenly wrong and background gone: bad 6802 on the sound board
- A 6802 CPU chip works in place of the 6808
- CPU chip types: 6800 on System 3/4, 6802 or 6808 on System 6/7
- Using a 6802 on a type 2 sound board
- System 6/7 sound and speech board ROMs
- System 9 sound and speech boards fit System 6/7
- Replacement CPU board keeps reporting a U38 PIA fault: try another 6802
- Transistors, diodes and chips to keep for CPU and driver repairs
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)