Apparatus and method for generating multiple cursors in a...

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G - Physics

09

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375/11

G09G 1/00 (2006.01) G06F 3/023 (2006.01) G09B 5/12 (2006.01) G09G 5/08 (2006.01) G09G 5/42 (2006.01)

Patent

CA 1232092

-26- APPARATUS AND METHOD FOR GENERATING MULTIPLE CURSORS IN A RASTER SCAN DISPLAY SYSTEM ABSTRACT An apparatus and a method for generating cursors in a multi-dimensional graphics display system uses line definition signals, each of which is repre- sentative of where along the horizontal display dimen- tion one or more scan lines intersect a cursor to be presented. The apparatus includes a line definition memory for providing one or more line definition sig- nals, and a line definition pointer circuit which responds to a scan line location by the vertical dimen- sion, for selecting the line definition signal repre- sentative of the scan line. A generation circuit provides a cursor video signal at each horizontal location, as indicated by the selected line definition signal, where the represented scan line intersects the cursor to be presented.

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