Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-11-21
1997-05-27
Powell, Mark R.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
395509, G06F 1200
Patent
active
056336616
ABSTRACT:
A video random access memory is disclosed that performs a block write function for an opaque pattern color expansion. The video RAM, or VRAM, uses an input buffer for receiving and holding video input information. A first color register is coupled to the input buffer and holds a first color value. A second color register coupled to the input buffer is used to hold a second color value. A gate multiplexor couples to both first color register and the second color register with a color selection register being used to gate which color value from the first color register or the second color register should be asserted. A write control logic selects which color values are to be displayed. A third or mask register is coupled to the input buffer and the write control logic such that, based upon data from the input buffer, the mask register selects which pixel location is to be changed based on the color value selected by the color selection register as received from the write control logic.
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International Business Machines - Corporation
Powell Mark R.
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