ADB Apple Desktop Bus pinout. 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. Free service manuals.

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