adb4

Usage

Overview

The Apple Desktop Bus (ADB) is the single-master, multiple-slave, low-speed serial bus interface used by Macintosh computers to connect input devices such as keyboards, mice, trackballs, and graphics tablets to the machine.

Originally developed for the Mac68K port, the adb driver was heavily modified when it was ported to the PowerPC architecture. During this port it seems that the original adb event device was split into many smaller subsystems, namely:

1. Apple Keyboard driver (akbd(4)).

2. Apple Mouse Support driver (ams(4)).

New adb devices such as the Apple Brightness / Volume Control Button (abtn(4)), some energy control (apm(4)), and I2C controller (piic(4)) were added to the PowerPC port later to complement the ADB system.

OpenBSD provides support for the following devices:

abtn(4)

Apple brightness/volume/eject button control

akbd(4)

Apple Keyboard Device

ams(4)

Apple Mouse Support

apm(4)

advanced power management device interface

piic(4)

Apple via-pmu I2C controller