CPU board versions 520-5003-01, -02 and -03

All use a 6808 or 6802 and copy the System 11 CPU minus its sound section. Version 1 (520-5003-01) was fitted to part of Laser War only and has a 2K 24-pin RAM at 5D. Version 2 (520-5003-02) covers Laser War to Phantom of the Opera with an 8K 28-pin RAM at 5D. Version 3 (520-5003-03) covers Back to the Future to Batman Forever and adds CPU-controlled pop bumpers and slingshots.

Systems

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

Related tips

• Laser War can have a version 1 or version 2 CPU
• Full CPU jumper settings by board version
• Other CPU jumpers and what they set
• Bench-testing a CPU board on +5 V
• CPU boards are only downward compatible
• CPU EPROM jumpers J4 and J5
• Where the TIP122 drivers are on the CPU board
• CPU board PIA positions and jobs

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