Laser War can have a version 1 or version 2 CPU

Part of the Laser War run has the 520-5003-01 CPU with one 27256 at 5C; the rest have the 520-5003-02 with a 27128 at 5B and a 27256 at 5C. Its sound board is either 520-5002-00 or 520-5002-02.

Systems

• Data East CPU Version 1/2

Games

• Laser War

Related tips

• CPU board versions 520-5003-01, -02 and -03
• Laser War: CPU and display EPROM types and latest versions
• Flipper circuit on Laser War to Time Machine
• SMIG relay boards on Laser War and Secret Service
• Fusing the special coils on Laser War to Playboy
• Laser War and Secret Service use a different backbox layout
• Time Machine: CPU and display EPROM types and latest versions
• Robocop: CPU and display EPROM types and latest versions

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