2 descender data – AMT Datasouth 41AY89AR777 User Manual
Page 90
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4.4.2
DESCENDER DATA
The Most Significant Bit (MSB), of the attribute byte contains descender data.
As stated earlier, when the MSB of the attribute byte is 0, the entire character is
shifted down in the matrix by one dot. When the MSB is 1, the character
occupies the top eight dot positions of the matrix. In Figure 4.4, the 8X11
matrix for a draft character has been expanded to show the ninth dot position.
The character on the left demonstrates how the character is printed when the
MSB of the attribute byte is 1. The characta: on the right demonstrates how the
character is printed when the MSB of the attribute byte is 0.
P. Po P, P. Pc P=
f?.
1
2
3
4
5
6
7
8
9
10
11
I
P P P
4
5
6
R.
f?.
7
8
9
1 0
1 1
Figure 4.4 Descender Data
In the sample program in Figure 4.5, the “=” character and the “>” character are
bodi replaced by the “A” character. Notice that the “A” character which replaces
the “>” character is descended.
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