Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1995-06-07
1997-03-04
Powell, Mark R.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345133, 345150, G09G 534
Patent
active
056084234
ABSTRACT:
A video display processor and system supports hardware scrolling of the display. Horizontal and vertical scroll registers control the base address of the memory storing the display data. The horizontal scroll register resets a horizontal state register at the beginning of each horizontal line of a raster scan display. The horizontal state register counts for each pixel of the horizontal line. The vertical scroll register resets a vertical state register at the beginning of each screen of the display. The vertical state register counts for each line. Addressing logic uses the horizontal state register and the vertical state register for recalling display data from memory. This recalled display data controls the contents of a video display. The display may be scrolled horizontally or vertically by a host processor writing into the scroll registers. A display priority logic and sprite registers permits mobile sprites to be overlain upon the base display.
REFERENCES:
patent: 4232311 (1980-11-01), Agneta
patent: 4524421 (1985-06-01), Searby et al.
patent: 5089811 (1992-02-01), Leach
patent: 5379049 (1995-01-01), Leach
Donaldson Richard L.
Kesterson James C.
Luu Matthew
Marshall, Jr. Robert D.
Powell Mark R.
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