What each System 80 board does
The A1 control (CPU) board reads the switch matrix and slam input on J5 and J6 and sends segment data on J2, digit strobes on J3 and all lamp, coil, relay and sound commands on J4. The A3 driver board takes those commands on its J1 and switches lamps, relays and coils through power transistors, passing sound commands on to the A6 sound board. The bottom board holds the transformers, rectifiers and fuses, and the A2 power supply regulates the logic and display voltages.
Systems
Related tips
- System 80 control board chips
- How the System 80 driver board is laid out
- How the original System 80 sound board makes sound
- Supplies on the original System 80 sound board
- System 80 board drawing and assembly numbers
- System 80 transformer part numbers
- Fault-finding the original System 80 sound board
- Key pins on the System 80 LSI chips
Source: System 80 Service Manual, Gottlieb