Apple Desktop Bus (ADB)
4 PIN MINI-DIN FEMALE at the computer.
|1||Data||Data, grounded by an open collector or pulled to +5 V through 470|
|2||Power On||Power on, fed by +5 V through 100 k; connect to pin 4 to turn on the system|
|3||+5V||+5 V at 500 mA maximum drain; protected by a 1.25-A circuit breaker|
At least available on: Power Macintosh 9500