Data East CPU diagnostic test EPROM

Data East made a diagnostic CPU program that runs on every CPU board generation, version 1 (Laser War) through version 3b (Batman Forever). It is burned into a 27512 EPROM that goes in socket 5C, and gives far more information than the normal power-on LED codes.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

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Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)