Leon's Data East CPU test EPROM

A hobbyist test program for these CPU boards is burned into a 27512 and fitted at 5C; it works whether the board is jumpered for a 27256 or a 27512. It switches every output of all six PIAs high and low so each can be checked with a logic probe.

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)