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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.
