Manuals may list the wrong EPROM sizes

Several later Sega manuals list EPROM sizes at 5B and 5C that do not match the actual code files. Go by the size of the downloaded image (as in the version chart) when choosing a blank EPROM.

Systems

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

Related tips

• CPU jumpers J4 and J5 set the EPROM size at 5C
• CPU EPROM jumpers J4 and J5
• Two PIA exceptions when using the PIA test EPROM
• Running the Data East test EPROM
• Counting test EPROM LED flashes
• Checking PIA outputs with Leon's test EPROM
• Data East CPU diagnostic test EPROM
• The test EPROM does not fire the six special solenoids

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