How Gottlieb numbers double-sided connector pins
"A1" is the CPU board and "A3" the driver board. On double-sided edge connectors the component side pins are numbered and the solder side pins are lettered, skipping G, I, O and Q. Past Z the letters repeat with a bar over them, written here as /A, /B and so on.
Systems
Related tips
- Remove pins from a Gottlieb double-sided connector
- Molex housings and pins for the System 80 CPU connectors
- Ground mod step 4: double the +5 V and ground pins between CPU and driver boards
- System 80 CPU board connectors and what they carry
- Which CPU connector housings can be reused
- Which driver board connectors cause the most trouble
- CPU board connector A1J4 (to the driver board)
- CPU board connector A1J5 (coin door)
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)