CPU board EPROM and RAM size jumpers

JP1 in and JP2 out sets a 27512 EPROM at U2; JP1 out and JP2 in sets a 27256. JP3 in and JP4 out sets a 6116 RAM at U3; JP3 out and JP4 in sets a 6264. A 6264 also works in older games.

Systems

• Gottlieb System 3

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Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)