Which logic chips drive which solenoid transistor pairs

Pairs Q35/Q43-Q38/Q46 come from the 7408 at 4J, and pairs Q31/Q39-Q34/Q42 from the 7408 at 3J; both 7408s are fed by the 74LS273 latch at 5H, which is fed by PIA 11D. Pairs Q19/Q27-Q22/Q30 come from the 7408 at 2J and pairs Q15/Q23-Q18/Q26 from the 7408 at 1J; both are fed by PIA 5F.

Systems

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

Related tips

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• Switch column (drive) circuit on the CPU board

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