ADB Bus [Apple Desktop Bus] was a serial bus used by Apple computer to drive the mouse and keyboard. The cable consisted of one bidirectional data line [pin 1], a +5 volt power line [pin 3] and a ground line [pin 4]. Some systems also used a power-up line on pin 2. The maximum data rate was 125kbps, actual bus speed was much lower. The maximum cable length was 5 meters, using a Mini-DIN 4 pin male connector. However 6 feet and 12 feet straight or coiled cable lengths are common. Keyboard cables are normally Male-to-Male cables. The ADB bus is OBSOLETE and was replaced by the Firewire bus. ADB to USB adapter cables are also produced allowing older peripheral devices to be used with newer MAC computers.
| Pin Number | Function |
| 1 | Data |
| 2 | Power up |
| 3 | 5volt |
| 4 | Ground |
All other Apple interfaces are listed on the Apple Computer
Buses page. PC Buses [descriptions and pin outs].
The IBM PC uses a different pinout for the mouse interface.
Mouse & Keyboard Manufacturers
Engineering Key words: Apple, Macintosh, MAC, Computer Buses,
Connector Pin-Outs, Interface Standard, Specification, Spec,
Physical Interface, Description, Personal Computer Interface, Peripheral,
Printer Interface, Keyboard, Obsolete, Out-dated, Legacy Equipment, Gear.
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