Compaq Computer Corporation, Inc.

Roger A Kaiser

James H Nuckols

Theodore F Emerson

Gary L Brasher

Jack D Johnson

A keyboard controller or interface with scans entered key sequences for a key sequence activating a keyboard lock feature. A password and particular hot key are loaded by the system microprocessor. The keyboard interface then scans untl the designated sequence is activated. All keyboard activity is blocked from the system microprocessor until a password sequence is entered. Codes releasing some of the key strokes in the activation sequence are transmitted and normal operation, including activation sequence scanning, resumes. The password mode may be directly activated on command from the system microprocessor.

Keyboard password lock

An improved keyboard interface is provided for use with personal computers. A received scancode from the keyboard is made available at a port which may be repeatedly inspected by the CPU. The scancode data remains available until explicitly cleared by the CPU, or until a preestablished time-out interval has expired.

Keyboard interface for use in computers incorporating

A computer having an improved keyboard/auxiliary device interface controller which supports the selective restriction of user interaction with the computer system, while maintaining the full internal functionality of the host/peripheral interface. A 'password lock mode' of the improved controller prevents users from gaining unauthorized access to the computer system, but still application and operating system software can continue to issue commands to and receive responses from the otherwise disabled peripheral devices. The improved controller does not require modification to the conventional keyboard/auxiliary device hardware.

Growing community of inventors

Houston, TX, United States of America

Roger A Kaiser