128 x 32 controller: R11 sets the EPROM size

The -00 and -01 versions of the 128 x 32 controller differ only in R11, a 0 ohm jumper. Fitted (-00), the board takes two 27020 EPROMs; removed (-01), it takes one 27040. Remove R11 before fitting a 27040.

Systems

• 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 Three, Clay Harrell (pinrepair.com)