AMT Datasouth 41AY89AR777 - Manual (Page 104)

Figure 4.12 is an example of how to plot a figure as individual dots in DS-180
graphics. The figure at the tallest point is 36 dots high. With a vertical resolution
of 72 dots per inch the printed figure will be 1/2 inch tall. At the widest point the
figure is 35 dots wide. With a horizontal resolution of 75 dots per inch the
printed figure will be just under 1/2 inch wide (by two and one/half dots). Notice
also that the two smaller columns are 24 dots tall (1/3 inch) and 18 dots tall
(1/4 inch).
Figure 4.12 Graphics Figure (DS-180 Graphics)
Since six print wires can be controlled in DS-180 graphics , the figure should be
divided into lines (see 4.12), each six dots tall (the height of one column). Notice,
after dividing the figure, that the printhead must make six passes to complete the
figure. The user must examine each line, beginning with line 1 and determine
which print wires must be fired for each column. In column 1 of line 1, all six
print wires must be fired. Adding the decimal value of all six wires (see 4.11 for
the value of each wire), gives column 1 a value of 63.
NOTE
In DS-180 graphics mode, a graphics byte must have bit
7 set to 1 to be a legal graphics byte. Therefore, when
calculating the value of each column of graphics the value of
bit 7 (which is 64) must be added to the value of the print
wires. The resulting value for column 1 is then 127
(63 plus the value of bit 7).
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