Sound board chip 86L93 can be replaced by a 74LS93
Where a sound board uses an 86L93 counter chip, a 74LS93 is a direct substitute.
Systems
Related tips
- No sound from the AS-2888 sound board: repin, then check U11 and U8
- Sound module -32 and -50 test points
- Identifying AS-2518-51 and AS-2518-56 sound boards
- AS-2518-51/-56 sound board jumpers
- Bench-test a -51/-56 sound board with a test EPROM
- Sound Plus -56 and vocalizer test points
- Which -51/-56 sound ROMs respond to the board test button
- Background sound works in test but not in games: check DIPs 29-30, then reseat connectors
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)