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downloaded and stored in RAM (Random Access Memory) for
use.
Designing and printing your own characters has two re-
quirements: firstly, designing the shape of the character,
calculating the data necessary to make the shape, and sending
that data to the printer, and secondary, sending the command to
print the downloaded characters instead of the standard
characters. There are a number of design constraints for
download draft quality characters:
l The matrix or grid on which you design the characters is
five boxes wide by twenty-four boxes high.
l Horizontally, dots may be centered in a box, or may
straddle a line, making the actual character grid 9 dots
wide by 24 dots high. Vertically, dots can only be
centered in a box. See Figure 7-2.
l Dots cannot overlap - that is, you may not have a dot
inside a box next to one that is on a line.
i
Figure 7-2.
Dots can be inside boxes or straddle the vertical lines
of the grid.
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