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Connector pinout: ADB Apple Desktop Bus 4 PIN MiniDin Connector on Apple Computer Note : Power +5V is 500mA, each peripheral should use 100mA max. Signals ADB (Apple Desktop Bus) Machintosh bidirectional data bus. PSW (Power Switch) Switch to startup, reset or interrupt the computer. 4 PIN MiniDin Connector on Apple Computer pin name direction description color 1 ADB Apple Desktop Bus 2 PSW Power Switch 4 +5V Power +5V 3 GND Ground