Selective control of window related overlays and underlays

Details Selective control of window related overlays and underlays Selective control of window related overlays and underlays

G - Physics

06

F

G06F 3/14 (2006.01) G09G 5/06 (2006.01) G09G 5/14 (2006.01)

Patent

CA 2053988

Apparatus and methods for selectively controlling by window the number of overlay planes, the number of overlay palettes, and the overlay/underlay plane masks in a graphics video display system. A logic/multiplex control translates overlay and underlay data patterns from a multiple plane VRAM, referenced to the graphics system frame buffer, into window specific patterns. The window related translation is conveyed to conventional RAMDACs for raster scan synchronized digital-to-analog conversion. The translation as provided by the controller is responsive to data selectively and dynamically written into a random access memory, thus providing translation of overlay/underlay data into window distinct and selective overlay/underlay palette functions.

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