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91
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
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