Specifications

1.4.5 Character Formation and Timing
Character formation and timing is accomplished in two different modes:
data processing (draft) font and near letter quality (correspondence) font.
When data processing font is selected, dots are printed during each
left-to-right movement of the shuttle. Individual print actuators are
activated at each position where a dot is required, at a horizontal dot
resolution of 60 dots/inch. After the first dot-row is printed, the shuttle
reverses direction, while the paper is advanced a distance 1/72-inch to
the next horizontal dot-row. The time to print one line is 24 ms, that is
18 ms to print one dot-row and 7 ms for shuttle turn-around and paper
movement.
When NLQ font is selected, dots are printed during left-to-right and
right-to-left movements of the shuttle. After the left-to-right dots are
printed, the shuttle reverses direction, paper is not advanced, print
actuators are again activated to print a second row of dots interlaced
with the first, thus providing a horizontal resolution of 120 dots/inch. The
paper is then advanced 1/144-inch to the next dot-row, thus providing a
vertical resolution of 144 dots/inch. The time to print one line is 24 ms,
that is 18 ms to print one dot-row and 7 ms for shuttle turn-around and
paper movement.
Data Processing printing requires one shuttle pass per dot row. NLQ
printing is performed by printing the same dot row on two consecutive
shuttle passes. The second pass fills in adjacent dot positions in the same
row. Data Processing dot rows are 0.23 mm (1/72 in) apart vertically;
NLQ dot rows are 0.46 mm (1/144 in) apart vertically. Table 1-2 shows
the dot patterns and Character Per Inch (CPI) of the standard fonts.
INTRODUCTION 1–5