Bit mapped memory plane with character attributes for video display
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United States of America Patent
Stats
-
Apr 30, 1991
Issued Date -
N/A
app pub date -
Jul 28, 1988
filing date -
Dec 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video display controller for controlling the display of characters stored in a bit plane memory. The characters to be displayed are arranged in the bit plane memory in a set number of scan lines with a set number of data bits in each scan line. Attribute bits are included in one scan line of data bits in each character to be displayed. The controller includes a data bus for receiving data from the bit memory plane in bytes, each of which includes data bits of one scan line. Each data byte from the data bus is clocked into a shift register, with the data byte shifted out of the shift register sequentially, one bit at a time. Attribute bytes are selected from the data bus and an attribute logic circuit applies the attribute bits to the sequential data bits of a corresponding character to be displayed.
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