Display controller
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United States of America Patent
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-
May 30, 1989
Issued Date -
N/A
app pub date -
Jul 13, 1988
filing date -
Mar 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A display controller can display a cursor having sufficient contour irrespective of the background color. The display controller has two cursor pattern memories from which first and second cursor patterns are read in such a timing that the first cursor pattern is displayed at a selected position on the screen and that the second cursor pattern is superimposed on the first cursor pattern. The display controller also has two registers storing therein first and second color codes corresponding respectively to the first and second cursor patterns. The color of the first cursor pattern is determined by a color code obtained by subjecting the first color code and a background color code read from a video memory to a logical multiplication, and the color of the second cursor pattern is determined by a color code obtained by subjecting the color code of the first cursor pattern and the second color code to an exclusive-OR operation. The logical operations are selectively effected in accordance with two control bits stored in a register.
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