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But there is another area of memory in this printer reserved
for user-defined characters. These are characters that you can
design and download into the printer. When download
characters are defined they are stored in RAM(random access
memory), which allows you to define or modify them at any
time.
Each of these draft characters, whether it is from the standard
ROM or in download RAM, is constructed on a grid which is
five “boxes” by twenty-four “boxes” high. In addition, a dot can
straddle any of the vertical lines. As an example, take a look at
the enlarged “9” superimposed on the grid in Figure 8-2. As you
can see, some dots are inside the boxes, and some are centered
on the vertical lines. This, in effect, makes the character grid 9
dots wide by 24 dots high.
Figure 8-2.
Dots can be inside boxes or straddle the vertical lines
of the grid.
DEFINING YOUR OWN CHARACTERS
You’ve seen how these characters are designed by using a
grid to layout the dots. Now you can define characters exactly