Device for interfacing two keyboards to one computer and for aut

Details Device for interfacing two keyboards to one computer and for aut Device for interfacing two keyboards to one computer and for aut

1990-03-27

1993-11-16

Lall, Parshotam S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

395725, 3408255, 34082551, 370 852, 364DIG1, 364234, 3642344, 3642426, 36424293, G06F 1314, G06F 13366

Patent

active

052631710

ABSTRACT:
This invention pertains to circuitry for automatically coupling up to four keyboards to a single keyboard port of a computer. Switching is accomplished by sensing a clock pulse appearing on one of the keyboard clock pulse lines responsive to a keystroke appearing on one of the keyboards. The clock pulse is applied either to a set input or a reset input of a latch, depending from which of keyboard clock pulses lines the pulse originated. The set or reset condition of the latch evokes a selected voltage potential on the output of the latch, which biases "on" bi-directional switches, coupling one of the keyboards to the computer.

REFERENCES:
patent: 3492648 (1970-01-01), Olsen et al.
patent: 3934230 (1976-01-01), Salle et al.
patent: 4227072 (1980-10-01), Fancy et al.
patent: 4314164 (1982-02-01), Tin et al.
patent: 4339808 (1982-07-01), North
patent: 4423384 (1983-12-01), DeBock
patent: 4872004 (1989-10-01), Bahnick et al.
patent: 4903200 (1990-02-01), Mook, Jr.
patent: 4924220 (1990-05-01), Mihara et al.
patent: 4962379 (1990-10-01), Yasuda et al.
patent: 4965560 (1990-10-01), Riley
patent: 5136694 (1992-08-01), Belt et al.

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