Importance

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Abstract

A small computer architecture in which the CPU can receive multiple kinds of interrupt signals, including one kind which is assigned to indicate the occurrence of a keystroke input and another kind which is assigned to indicate the occurrence of a pointing device input. However, the computer does not include any pointing device as such. Instead, the keyboard microprocessor (i.e. a microprocessor other than the CPU) monitors user keystrokes to the computer's keyboard, and: in response to simple keystrokes, or keystroke combinations which include one of the basic chording keys, the keyboard microprocessor sends a keystroke interrupt to the CPU; and in response to keystroke combinations which include an additional chording key, the keyboard microprocessor sends a pointing-device interrupt to the CPU, and provides a data output corresponding to an emulated pointing-device movement.

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First Claim