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108
the print head, showing the ends of the wires and their relation-
ship to the draft characters.
As you can see, the capital letters
use the top eighteen wires of the print head, and the descenders
(such as the lower case "p" shown) use the bottom
eighteen
pins. As the print head moves across the page (in either direc-
tion - that's what is meant by b&directional printing) it prints
one column of dots at a time. Each time a dot is supposed
to
print an electromagnet
inside the print head causes the ap-
propriate wire to strike the ribbon (making this printer an im-
pact printer).
Figure 7-1.
As the print head moves across the page, each of the
wires prints one row of dots.
DESIGNING YOUR OWN CHARACTERS
Standard
characters
are permanently
stored in the printer's
ROM (Read Only Memory),
but characters
you design
are
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