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93
CPS with the LQ characters.
The main advantage to half-speed
printing is a quieter run.
n
Uni-directional
printing
Uni-directional
printing means printing in one direction only.
Your printer normally prints when the print head is moving in
both directions. But once in a while you may have an application
such as making table where you are more concerned
with how
the vertical lines align than with how fast it prints. The printer
lets you make this choice. The table below shows the commands
for controlling
how the printer prints.
Table 6-3
Printing direction commands
Function
Control code
Print in one direction
(ESC) "U" 1
Print in both directions
(ESC) "U" 0
One time print in one direction
(ESC) I'("
Try this program
to see the difference
that printing
in one
direction makes.
10
' Demo of uni-directional
printing
20 LPRINT CHR$(27);"A";CHR$(6);
30 FOR I=1
TO 10
40 LPRINT
"I"
50 NEXT I
60 LPRINT
:LPRINT
70 LPRINT CHR$(27);"Ul";
80 FOR I=1
TO 10
90 LPRINT
":"
100 NEXT I
110 LPRINT CHR$(l2);CHR$(27);"g"
Here is what you will get. The top line is printed bi-directional-
ly, and the bottom is printed uni-directionally.
You will have to
look hard because there isn't much difference,
but the bottom
vertical lines are perfectly aligned.
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