Atari 1025 Field Service Manual page 19

To
print the letter the print
head
strikes
in
a
series of vertical rows, but only with the
pins
required
to
form
the
letter.
After the
first
column
has been
printed,
which
occurs
when
the proper
lines
drop
Low,
the
space motor advances one row
as a result of a
Low
signal
from
the 8155.
When
the
print
head
has
been advanced
to
the next column,
it
again strikes the proper
dots.
The above
steps are
repeated
until
the
letter
I
is
formed
as
in
Figure
1-8 below.
Figure
1-9. Print
Head
Pattern
of the Letter
I.
Atari 1025 Printer
Field Service Manual
1-9