Input data reader apparatus for switch array

Details Input data reader apparatus for switch array Input data reader apparatus for switch array

1984-10-12

1987-04-28

Smith, Jerry

Excavating

340365E, G06F 1100

Patent

active

046619577

ABSTRACT:
An input data reader apparatus includes a switch array or matrix which is formed of a plurality of switches and having input lines and output lines, one or more of the output lines being connected to one or more of the input lines according to a switch selection state of the switch array, a driver for supplying drive signals to the respective input lines of the switch array and defining input address data representing a line selection state of the input lines, and a buffer gate coupled to the output lines of the switch array and being responsive to sense signals which are obtained in accordance with the contents of the drive signals and with the switch selection state of the switch array, for generating output address data representing a line selection state of the output lines. The input data reader apparatus also includes a microcomputer coupled to the driver and the buffer gate, for detecting the combination of one or more simultaneously turned-on switches of the switch array according to the input address data and the output address data.

REFERENCES:
patent: 3623016 (1971-11-01), Winkler
patent: 3644888 (1972-02-01), Marino
patent: 3792466 (1974-02-01), Arnold
patent: 4231016 (1980-10-01), Ueda
patent: 4413314 (1983-11-01), Slater et al.
Electronics/Apr. 19, 1984, "Touch Screens Let Your Fingers Provide a Fast, Simple Entry Into the Computer", pp. 140-144.
Holloway et al, "Controlled Switch-Matrix Keyboard," IBM Technical Disclosure, 10/1984, pp. 2779-2780.
IBM Technical Disclosure Bulletin, "Low-Cost Keyboard Scanner", pp. 5777-5778, vol. 25 11A, Apr. 1983, P. Jeanniot and R. Vautier.

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