Kaypro 10 - Graphics Characters

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Graphics Characters
Each of the character positions on the screen occupies the same area as eight
pixels (4 high, 2 wide). Thus, pixels can be addressed in groups of eight at a time.
To set pixels in a character position, the cursor is moved to that position, and
then a byte is sent
to the console output. This byte must have the high -order bit
set
to 1 to distinguish it from normal characters. The remaining seven bits are
used
to set 7 of the 8 pixels.
i.e., to write these pixels ....
Pixel # 1
.,
...
Pixel #0
Pixel # 3
.,
..
Pixel # 2
Pixel # 5
.,
.. Pixel #4
Pixel # 7 (off)
•
.. Pixel #6
output this byte:
,) I I I
must be '1' //
bit for # 6
1 1 I I,
\
"
bitfor#O
bit for # 1
bit for # 5
bit for # 2
bit for # 4 bit for # 3
As
shown above, pixel # 7 is off . To write a pixel with it on, send the inverse video
command (ESC,B,O), then output the inverse for bits 0 through 6, i. e., 10000000b
would print a blank graphics character; (ESC,B,0),10000000b would print a solid
character.
/11 elollo
D ~
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