Apparatus for converting scan data of a keyboard

Details Apparatus for converting scan data of a keyboard Apparatus for converting scan data of a keyboard

1990-05-16

1992-03-31

Weldon, Ulysses

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 23, 341 26, H03K 1794

Patent

active

051012014

ABSTRACT:
There is disclosed a circuit for converting scan data comprising a key matrix switch having multiple keys and multiple mode selecting switches for producing scan data when one of said keys is activated, a scan decoder for decoding said scan data to produce a mode selecting signal, first scan data, second scan data, and first and second clock signals respectively synchronized with said first and second scan data, first and second latch circuits for latching said first and second scan data according to said first and second clock signals, and a mode selecting adder for converting the first and second latched output data of said first and second latch circuits into the first and second converted scan data according to the mode selecting signal of said scan decoder, whereby scan data of a different modes may be produced according to the operation of said mode selecting switches.

REFERENCES:
patent: 3228004 (1966-01-01), McGregor
patent: 3518657 (1970-06-01), Zinn et al.
patent: 3631455 (1971-12-01), Gregg
patent: 4006463 (1977-02-01), Hanks
patent: 4645916 (1987-02-01), Raisleger
Kuhar, E., "General Keyboard Translator Adapter", IBM Technical Disclosure Bulletin, vol. 20, No. 8, Jan. 1978, pp. 2935-2936.

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