Light pen detection circuit and method

Details Light pen detection circuit and method Light pen detection circuit and method

G - Physics

09

G

375/38

G09G 1/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1165024

ABSTRACT OF THE DISCLOSURE Electronic apparatus and method for determining location of the sensing aperture of a light pen on the face of a raster scan monochrome CRT is disclosed. In a preferred embodiment, logic circuitry and cascaded counters are used to determine position information for the earliest horizontal detection of light during each frame. Apparatus is included for retaining the position information and making it available to the CRT processor for use in generating a cursor.

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