System 7: Leon's code also exercises sound PIA IC36
On System 7, the IC36 sound PIA can be checked the same way as IC18, except pin 9 (PA7), which sits high or low depending on a jumper. It does not use CA2/CB2.
Systems
Related tips
- System 7 sound select connector 1J8
- Wrong sounds play
- Missing words or sounds from cracked connector pins
- EPROM types used for System 3 to 7 game code
- Leon's code with the driver board attached
- System 7 SW1 diagnostic codes
- What System 7 codes often turn out to mean
- Flipper ROM color codes by system
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)