Logic probe readings on the matrix connectors of a booted CPU

With the board booted in attract mode: switch rows CN10 (key pin 4) sit high; switch columns CN8 (key pin 6) pulse; lamp rows CN6 (key pin 4) pulse low; lamp columns CN7 (key pin 5) pulse.

Systems

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

Related tips

• Other CPU jumpers and what they set
• CPU boards are only downward compatible
• CPU EPROM jumpers J4 and J5
• CPU board versions 520-5003-01, -02 and -03
• Where the TIP122 drivers are on the CPU board
• CPU board PIA positions and jobs
• CPU jumpers J4 and J5 set the EPROM size at 5C
• Full CPU jumper settings by board version

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