Which switches are outside the switch matrix

The coin door test buttons go straight to CPU connector CN14, and the special solenoid switches come in at CN18. Every other switch is in the 8 column by 8 row matrix, giving up to 64 switches.

Systems

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

Related tips

• Check the switch matrix with a logic probe
• Resistor networks in the switch matrix
• Coin door test buttons bypass the switch matrix
• Switch row or column error: CPU board or playfield?
• Switch row (return) circuit on the CPU board
• Test the switch column drivers with a diode jumper
• Test the switch row inputs with a diode jumper
• Switch column trace map from CN8 to the 74LS244

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