Keyboard Controller Failure

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Explanation: The system has detected what appears to be a failure with the keyboard controller, which interfaces the keyboard to the motherboard.

Early computers relied upon an Intel 8042 keyboard controller to interface to the keyboard. The controller on the motherboard actually interfaces with a similar controller inside the keyboard using a specialized serial link. Today's computers merely emulate the 8042 for compatibility instead of actually putting one on the motherboard. As computers evolved, some Super I/O chips were further integrated, incorporating into them the keyboard control functions as well. This of course eliminates the need for a separate keyboard controller chip.

The keyboard controller provides the following functions to the PC:

Diagnosis: There is a problem either with the keyboard or with the keyboard controller on the motherboard.

Recommendation:

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