Enhanced video graphics controller

Details Enhanced video graphics controller Enhanced video graphics controller

G - Physics

09

G

354/236.2

G09G 1/28 (2006.01) G09G 5/02 (2006.01) G09G 5/06 (2006.01)

Patent

CA 1281433

ABSTRACT OF THE DISCLOSURE An enhanced video graphics controller for converting digital signals to a video signal is described. The controller is capable of displaying composite or analog RGB colors as well as providing shades of grey on monochrome displays. The processing of graphics information includes arranging 256 colors into 16 palettes of 16 colors each. A pointer for each scan line of a display selects one of the palettes and bit strings from a pixel bit map select pixel colors from the palette. The video controller is also capable of operating in several optional modes which include fill-in and dithering modes, as well as providing interrupts to update previous scan line information during the display cycle. Further, the controller is capable of enhancing existing displays by providing text and background color as well as providing a color border around the display.

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