AMT Datasouth 41AY89AR777 - Manual (Page 97)

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Since eight print wires can be controlled in Epson graphics, the figure should be
divided into lines (see 4.9), each eight dots tall (the height of one column).
Notice, after dividing the figure, that the the printhead must make five passes to
complete the figure with only four print wires being utilized on the fifth pass.
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 eight print
wires must be fired. Adding the decimal value of all eight wires (see 4.8 for the
value of each wire), gives colxram 1 a value of 255. Column 2 has no dots and
therefore column 2 has a value of 0. This is also tme for columns 3,4 and 5. In
column 6 all eight print wires are fired so column 6 has a value of 255. Columns
7,8,9,10 and 11 also have a value of 255. In column 12 only the top three wires
are fired so column 12 has a value of 224. Column 13 has a value of 48 (print
wires 3 and 4 are fired). Column 14 has a value of 12 (print wares 5 and 6 are
fired). Column 15 has a value of 2 (print wire number 7 is fired). Column 16 has
a value of 1 (print wire number 8 is fired).
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