Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1988-04-04
1990-03-06
Yusko, Donald J.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 22, H03M 1100, G06F 302
Patent
active
049069934
ABSTRACT:
A digital keypad input device comprises a controller for driving a plurality of I/O signal lines selectively in input, output, and high impedance states. Each line operated in the output state presents an output logic signal that is detected, via a corresponding switch when closed, by another I/O line operated in the input state. Other lines are operated in the high impedance state. The method of the invention enables the number of manual switches to exceed the number of I/O lines.
REFERENCES:
patent: 4570154 (1986-02-01), Kinghorn
patent: 4673933 (1987-06-01), Bauer
patent: 4709228 (1987-11-01), Hucking
Freeman Mark S.
McElhinney Brian S.
Becker Stephen A.
Ishimaru Mikio
John Fluke Mfg. Co. Inc.
Lau Yuk H.
Yusko Donald J.
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