Graphic display scan line windowing capability

Details Graphic display scan line windowing capability Graphic display scan line windowing capability

G - Physics

09

G

375/13, 354/236.

G09G 1/00 (2006.01) G09G 5/14 (2006.01) G09G 5/40 (2006.01)

Patent

CA 1240079

ABSTRACT The invention pertains to a computer display system for displaying text and graphics on a scan line basis wherein a scan line windowing apparatus for selectively blanking the graphics display is provided. A bit map memory, in addition to storing information to be displayed on a CRT, further stores a bit for each scan line which is utilized to control the enabling or disabling of a portion of the information in the bit map memory which is to be displayed on the CRT.

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