Wiring a 2716 EPROM adaptor for Z23

PROM to EPROM pins: 1-22, 2-2, 3-3, 4-4, 5-5, 6-8, 7-7, 8-6, 10-13, 11-11, 12-10, 13-9, 15-23, 16-1; PROM 9 and 14 go to EPROM ground pins 12, 18, 19 and 20; PROM 18 to EPROM 21 and 24 (+5 V); PROM 17 is not connected. Add a 0.1 mfd cap across +5 V and ground.

Systems

• Gottlieb System 1

Related tips

• Spare chips for System 1 boards
• The six Rockwell "spider" chips on the CPU board
• Which spider chips fail and why
• Swapped U4 or U5 spider still does not work
• Check the TC3 jumper plug on the CPU board
• Odd high scores usually mean a bad 5101 RAM
• Aftermarket System 1 CPU boards
• Dead CPU board: first checks

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)