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a single line of triple-density graphics only one inch long requires 540
numbers. Fortunately, commercial software can do the calculations
for you.
Before you can put these numbers in a graphics program, however,
you need to know the format of the graphics command.
Graphics Command
The graphics mode command is quite different from the other com-
mands covered so far in this manual. For most of the other LQ modes,
such as emphasized and double-width, one ESCape code turns the
mode on and another turns it off. For graphics, the command is more
complicated because the code that turns on a graphics mode also
specifies how many columns it will use. After the LQ receives this
code, it interprets the next numbers as pin patterns and prints them on
the paper.
The LQ has one command that allows you to use any of the 11
graphics options. The format of the command is:
ESCape
“*” m n1 n2 data
In this command, m selects the graphics option and n1 and n2 spec-
ify the number of columns to reserve for graphics. The available
graphics options are listed in Table
6-1.
Table 6-1. Graphics Options
*Adjacent dots cannot be printed in this mode
6-5