CPU connector CN8: switch column pins and wire colours

Column wires are green with a coloured trace. Brown trace = column 1 (pin 1), red = column 2 (pin 2), orange = column 3 (pin 3), yellow = column 4 (pin 4), black = column 5 (pin 5), blue = column 6 (pin 7), violet = column 7 (pin 8), grey = column 8 (pin 9). Pin 6 is the key.

Systems

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

Related tips

• Switch column (drive) circuit on the CPU board
• Switch column trace map from CN8 to the 74LS244
• Switch row (return) circuit on the CPU board
• Test the switch column drivers with a diode jumper
• One switch column dead: parts to check in order
• 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)