Display control apparatus employing bit map method
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United States of America Patent
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Jun 6, 1989
Issued Date -
N/A
app pub date -
Nov 7, 1986
filing date -
May 7, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A display control apparatus using a bit map method, for controlling character attribute data, such as an underline and an overline. In the apparatus, a line control memory is arranged to preset information of character attributes in units of lines of character fonts to be transferred to a video memory; in a DMA transfer sequence of a DMA transfer controller. Character attribute control is performed in a character controller for each line transfer according to the attribute information read out from the line control memory, and expansion of a character font from a character font memory area to the video memory can be simultaneously performed with processing of character attributes from the line control memory.
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