Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1980-12-04
1983-03-22
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340744, G09G 116
Patent
active
043778100
ABSTRACT:
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.
REFERENCES:
patent: 3505561 (1970-04-01), Ward et al.
patent: 3512037 (1970-05-01), Eckert et al.
patent: 4093996 (1978-06-01), Hogan et al.
Data General Corporation
Dulaney Robert L.
Trafton David L.
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