Control board display connectors A1-J2 and A1-J3
A1-J2 carries segment data: pins 1-8 are segments a-h of group A, 9-16 group B and 17-24 group C. A1-J3 carries digit strobes D1-D16 on pins 1-16, with pin 17 spare.
Systems
Related tips
- Switch matrix connectors A1-J5 and A1-J6
- How the control board drives the displays
- A1-J4, A3-J1 and A3-J3 are double-sided edge connectors
- System 80 control board chips
- How the control board reset circuit works
- Control board clock frequency
- Control board power-on checks
- All displays are dark
Source: System 80 Service Manual, Gottlieb