Matrix Printing; The Dot Matrix - Printronix P9012 Maintenance Manual

Matrix Printing

The Dot Matrix

In order to generate characters from dots, the dots must be arranged properly.
The imaginary grid on which the dots are positioned is referred to as the
matrix.
When in the data processing print mode, for spacing of six lines per inch
there are 12 dot rows from the top of one character line to the top of the next
(Figure 2–1 and Figure 2–2). With spacing of eight lines per inch there are
nine dot rows per character line, for nine lines per inch there are eight dot
rows per character line, and for spacing of ten lines per inch there are seven
dot rows per character line.
Elongated characters can be generated by printing each row twice, except for
the first and last (Figure 2–3).
0.01389
0.02
Principles of Operation
1 COLUMN NO.
0.10
"
0.00835
"
"
"
Figure 2–1. Defining the Dot Matrix
12
FIRST ROW AND
COLUMN OF NEXT
CHARACTER
LOWEST
DESCENDER
DOT LINE
FIRST ROW AND
COLUMN OF NEXT
CHARACTER LINE
(AT 6 LPI)
2–3