Which RAM chips go at IC13 and IC16

System 3 to 6 CPU boards use 6810 RAM at IC13 and IC16; System 7 boards use 2114 RAM in those spots.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Remove an old chip socket
• Memory protect chips to check after the 5101
• Obsolete chips on System 3 to 7 CPU boards
• CPU chips Leon's test code does not need
• Williams house numbers for the 6800-family chips
• Using CPU diagnostics to test the 5101
• CPU chip types: 6800 on System 3/4, 6802 or 6808 on System 6/7
• Chips a System 7 CPU board needs to run the Williams test ROM

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)