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You will have a better understanding of how the (ESC) codes work
when you use them in your programming. Appendix A lists all the
ASCII codes and Appendix B summarizes their functions.
A BASIC example
Keep in mind that the ASCII codes and the ESCape sequences are
mostly used with programming languages. One example is to use
your printer to print listings of your programs.
Different computer systems access the printer in different ways. For
example, most computers that use Microsoft BASIC send PRINT or
LIST commands to the printer by adding a leading L to a screen com-
mand: LPRINT, LLIST. Your computer may not use these commands.
If you are not familiar with your computer’s command conventions,
check its manual.
We use BASIC in the following programs since it is widely used in
portable computers. If necessary, substitute the commands required
by your computer.
Once you have discovered how your computer communicates with
the printer using BASIC, enter the following program lines into your
computer.
10 LPRINT CHR$(27);"-1";
20 LPRINT "Underline"
Now list the lines on the printer using your computer’s version of the
LLIST command. RUN the program, and you’ll get this:
Underline
With the underline mode, you can underline characters or blank
spaces, which is useful when creating forms that have lines for signa-
tures
or data. See this for yourself by adding these lines to your pro-
gram. Enter
10
blank spaces in line
30
and
15
blank spaces in line
40.
30
LPRINT "
"
40
LPRINT "
"
Run your program. The result is:
Underline
30