CPU board connectors A1J1 to A1J3 (power and displays)
A1J1 brings power: pins 1 and 2 are +5 V, pins 4 and 5 ground, pin 3 unused. A1J2 carries display segments a to h: pins 1-8 for displays 1 and 2, pins 9-16 for displays 3 and 4, and pins 17-24 for the status/bonus displays. A1J3 carries the digit strobes: pins 1-6 are digits D1-D6 for displays 1, 3 and bonus, pins 7-12 are D7-D12 for displays 2 and 4, and pins 13-16 are D13-D16 for the status display.
Systems
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)