High-speed multiplexing of keyboard data inputs

Details High-speed multiplexing of keyboard data inputs High-speed multiplexing of keyboard data inputs

1978-12-29

1981-04-28

Groody, James J.

Boots, shoes, and leggings

364200, 370 58, G06F 302, H04J 314, H04Q 1104

Patent

active

042649846

ABSTRACT:
A high-speed multiplexing system of keyboard data inputs in which keyboard entered data is sequentially and automatically sampled by the multiplexing system for input to a computer. More specifically, a system is disclosed whereby a plurality of data inputs from a plurality of keyboards are applied to a multiplexer having a single output connected to a computer. A sequencer is provided which sequentially and automatically controls the multiplexer to sample each keyboard input in accordance with a predetermined sampling sequence. Whenever keyboard entered data appears on input lines to the multiplexer, the system inputs the keyboard data to the computer during a brief time interval in which the multiplexer remains at the particular keyboard address or port. Thus, a high-speed sampling circuit is provided whereby the only operator action required is data entry through a keyboard. Priority or interrupt systems are not required, and the multiplexer merely samples each keyboard output continually at high speed according to a predetermined sequence.

REFERENCES:
patent: 3162857 (1964-12-01), Sanders
patent: 3500336 (1970-03-01), Cuccio
patent: 3588838 (1971-06-01), Felcheck
patent: 4047158 (1977-09-01), Jennings
patent: 4100601 (1978-07-01), Kaufman et al.

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