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CHAPTER 7
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CHARACTERS
AND DOT GRAPHICS
Subjects covered in Chapter 7 include-
* Designing and printing your own characters
l User-designed graphics
Using the procedures outlined so far, all of the printer’s
standard functions can be utilized. There are two additional
user-defined functions available: designing and printing your
own characters, and designing and printing your own dot
graphics.
These two functions can be used to design and print any sym-
bol, or any graphic shape. This allows you to make your own
special symbols, or print a company logo. Some understanding
of dot matrix technology will be useful.
DOT MATRIX PRINTING
Before you start to learn how to create your own characters,
you’ll need some understanding of how dot matrix printers
work. The process is called dot-matrix printing because each
character is composed of small dots arranged on a matrix, or
grid. To see how that character grid gets printed, you need to
take a look at the print head itself.
The print head in this printer comprises 24 wires apparently
arranged in a vertical column. If you were to remove the print
head and look at the wires, you would see two staggered col-
umns of twelve wires. However, the timing is such that they
print as one continuous column of 24 wires.
Figure 7-1 shows an enlarged schematic view of the front of