History
ADB was created by Steve Wozniak, who had been looking for a project to work on in the mid-1980s. Someone suggested that he should create a new connection system for devices like mice and keyboards, one that would require only a single daisy-chained cable, and be inexpensive to implement. As the story goes, he went away for a month and came back with ADB.
The first system to use ADB was the Apple II in 1986. It was subsequently used on all Apple Macintosh machines starting with the Macintosh II and Macintosh SE. ADB was also used on a number of other 680x0-based microcomputers made by Sun, HP, NeXT and such.
The first Macintosh to move from ADB was the iMac in 1998, which featured USB in its place. The last Apple computer to have an ADB port was the "Yosemite" Power Macintosh G3 in 1999. No machines being built today use ADB for device interconnection, but up to February 2005, PowerBooks and iBooks still used the ADB protocol in the internal interface with the built-in keyboard and touchpad. Subsequent models used a USB-based trackpad.
Read more about this topic: Apple Desktop Bus
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“All history is a record of the power of minorities, and of minorities of one.”
—Ralph Waldo Emerson (1803–1882)