Real-time cursor generator

Details Real-time cursor generator Real-time cursor generator

1982-01-04

1984-06-12

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340709, 340747, G09G 114

Patent

active

044545070

ABSTRACT:
A system for writing cursors on a raster scanned television screen that uses the microprocessor in a display controller to produce blocks of data defining the parameters of vectors that compose the cursor. The blocks are put in a first-in first-out memory during a vertical blanking inerval or during active picture time. Each block specifies where writing of a cursor segment is to start and stop on a horizontal scan line and it also specifies a repeat count that indicates the number of lines on which the segment is to be written. Each block contains a delta value to indicate how much, if any each segment is to be displaced left or right from line to line so vertical and angulated vertical vectors can be produced. The blocks are read out of the memory consecutively by a circuit that converts the segment start and stop data to pixel counts. Pixel counters determine the writing start and stop points. When the number of horizontal lines on which segments are written equals the repeat count, the next block is processed.

REFERENCES:
patent: 3821731 (1974-06-01), Levine
patent: 3870922 (1975-03-01), Shutoh
patent: 3891982 (1975-06-01), Cheek et al.
patent: 3894292 (1975-07-01), Wilkinson et al.
patent: 3996585 (1976-12-01), Hogan et al.
patent: 4205389 (1980-05-01), Heartz
patent: 4228432 (1980-10-01), Osborne
patent: 4241341 (1980-12-01), Thorson
patent: 4259725 (1981-03-01), Andrews et al.

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