VGA controller for displaying images having selective components from multiple image planes
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United States of America Patent
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Oct 19, 1993
Grant Date -
N/A
app pub date -
Jan 3, 1992
filing date -
Jan 3, 1992
priority date (Note) -
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Abstract
A VGA controller having an overlay mode for displaying images formed from selective components of multiple image planes. A first image and a second image overlaying the first image are interleaved into three of four bit planes of a dynamic random access memory. When displaying the image, the controller will simultaneously read from the first and second images. If the value of the second image is non-zero, then the second image is displayed. Otherwise, the first image is displayed.
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