Universal light pen system

Details Universal light pen system Universal light pen system

1991-01-10

1993-02-16

Brier, Jeffrey A.

Communications: electrical

Land vehicle alarms or indicators

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

340706, G09G 302

Patent

active

051874679

ABSTRACT:
A light pen system in accordance with the present invention comprises (a) detecting means for detecting horizontal and vertical sync signals for controlling a raster-scan display; (b) line counter means, coupled to the detecting means and responsive to the horizontal sync signals, for providing a line count corresponding to the vertical position of the beam; and (c) pixel counter means, coupled to the detecting means, for providing a pixel count corresponding to the horizontal position of the beam.

REFERENCES:
patent: 3793481 (1974-02-01), Ripley et al.
patent: 4367465 (1983-01-01), Mati et al.
patent: 4677428 (1987-06-01), Bartholow

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