How double-sided edge connector pins are numbered
Pins on the component side are numbered and pins on the solder side are lettered. G, I, O and Q are skipped. Past 22 pins (Z), the letters start again with a bar over them, so the 23rd rear pin is written "/A".
Systems
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)