Talking to
the keyboard
The keyboard provides a great example of how the buses
and support programming help the CPU get the job done. In early computers, the keyboard
connected to the external data bus via a special chip known as the known as the
keyboard controller. Don’t bother looking for this chip on your motherboard-
the Southbridge now handles keyboard controller functions. The way the keyboard
controller-or technically, the keyboard controller circuitry-works with the
CPU, however, has changed only a small amount the past 20+years, making it a
perfect tool to illustrate how the CPU talk to a device.
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