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BASIC program. Generally, computers use about the same pro-
cedure for printing in a program as they do to list a program.
Let’s try what we learned. Type the following:
NEW
10 LPRINT "TESTING"
RUN
Remember-we use LPRINT; you may have to use something
else!
At any rate, you should have the word “TESTING” on your
printer. Quite an achievement, isn’t it? Let’s get done with this
simple stuff so that we can go on to something interesting.
n The CHR$ function
We mentioned CHR$ in Chapter 3 as one way to express
ASCII codes. We are going to use it a lot in communicating with
this printer. This printer uses many of the ASCII code that
don’t represent letters and numbers. The CHR$ function gives
us an easy way to send these codes to the printer. Try this to see
how the CHR$ function works:
NEW
10 LPRINT CHR$(80)
RUN
That should print a “P” for Printer. If you check the chart in
Appendix B you will see that 80 is the ASCII code for “P”.
n Control codes
This printer uses many of the non-printing ASCII codes for
control codes. These codes perform a function rather than print-
ing a character. Let’s try an easy one right now:
NEW
10 LPRINT CHRS(7)
RUN