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1. The computer is prevented from adding any extra characters by the
WIDTH statement (line 100).
2. The line spacing is changed to 8/72 of an inch-the height of the
dot patterns used in the program (fine 110).
3. The program goes through the graphics commands the required
number of times (fines 120 and 170).
4. A new graphics command is used for each line printed (lines
130-160). This part of the program is similar to the last example, but
two columns are printed each time through the loop making a total
of 100.
5. The last important thing to do is to reset the printer to its default
settings, including the normal line spacing (fine 180).
Notice that the graphics command (ESC K) can be in effect for only
one print line. To print more than one line of graphics, the graphics
command must be issued before each line.
Density Varieties
Although all the examples so far in this chapter have been in the
singledensity graphics mode, there are six other eight-pin densities and
two that use all nine pins. Nine-pin graphics is not necessary for most
uses, but you can find the command (ESC ˆ) in the Epson mode
command summary
The four most common eight-pin modes are available in both Epson
and IBM printer emulation modes. Their commands are ESC K, ESC L,
ESC Y, ESC Z. In Epson mode, there is also a general-purpose command
for any of the eight-pin graphics modes: ESC *. This command is used
in the same way as the individual commands, except that before
nl
and
n2
you must send the code for the graphics mode required. The
different modes are summarized in the table on the next page.
The following example shows how to use the ESC * command to
reserve 40 columns for singledensity graphics. This uses mode number
0 from the table to achieve exactly the same effect as the first example
using ESC K.
6-8
Graphics
and User-defined Characters