Keyboard activated screen blanking

Details Keyboard activated screen blanking Keyboard activated screen blanking

1991-06-21

1992-12-22

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, H04K 100

Patent

active

051739402

ABSTRACT:
A keyboard controller which scans entered input sequences for an input sequence to activate a display blanking feature. A password and particular hot key are loaded by the system microprocessor. The keyboard controller then scans until the designated sequence is activated. The display on the monitor is blanked until a password sequence is entered. The password mode may be directly activated from the system microprocessor. The display blanking feature is especially useful in conjunction with a keyboard password lock.

REFERENCES:
patent: 3890601 (1975-06-01), Peitrolewicz
patent: 4800590 (1989-01-01), Vaughan
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 4959860 (1990-09-01), Watters et al.

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