Switch column trace map from CN8 to the 74LS244

CN8-1, Q55, R105, RA11-2, 8J-18 (column 1); CN8-2, Q54, R104, RA11-3, 8J-3 (column 2); CN8-3, Q53, R103, RA11-4, 8J-16 (column 3); CN8-4, Q52, R102, RA11-5, 8J-5 (column 4); CN8-5, Q51, R101, RA11-7, 8J-14 (column 5); CN8-6 is the key; CN8-7, Q50, R100, RA11-8, 8J-7 (column 6); CN8-8, Q49, R99, RA11-9, 8J-12 (column 7); CN8-9, Q48, R98, RA11-10, 8J-9 (column 8).

Systems

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

Related tips

• Switch row trace map from CN10 to the 4011 chips
• CPU connector CN8: switch column pins and wire colours
• Switch column (drive) circuit on the CPU board
• Test the switch column drivers with a diode jumper
• Switch row or column error: CPU board or playfield?
• Whole switch column dead after working under the playfield
• Which switches are outside the switch matrix
• Check the switch matrix with a logic probe

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