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This article describes an improved reference encoding technique for compressing noncoded information for transmission over a communication link to a remote raster scan display device.
English (United States)
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Two Port Character Generator
This article describes an improved reference encoding technique for
compressing noncoded information for transmission over a communication link to
a remote raster scan display device.
The character generator is organized into an even bank 1 and an odd bank 2.
The scan counter includes scan register 3, scan backup register 4 and
incrementer 5, and is connected to multiplexers 6, 7, 8 and 9. The low-order bit of
scan register 3 controls multiplexers 6 and 7 to gate the appropriate addresses to
character generator banks 1 and 2 from character register 10. Multiplexers 8 and
9 control the outputs of the character generators 1 and 2 to gate the outputs to
the appropriate current/previous inputs of the data compressor 11. The low-order
bit of the scan register 3 controls the multiplexers 6, 7, 8 and 9 in accordance
with the following algorithm: When the low-order scan bit is 0, the address gating
source for the even bank 1 is the scan register 3, the address gating source for
the odd bank 2 is the scan backup register 4, the data compression input source
for the current line is the even bank 1, and the data compression input source for
the previous line is the odd bank 2. When the low order scan bit is 1, the address
gating source for the even bank 1 is the scan backup register 4, the address
gating source for the odd bank 2 is the scan register 3, the data compression
input source for the current line is the odd bank 2, and the data compre...