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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
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.
nThe 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”.
nControl codes
This printer uses many of the
NEW
10 LPRINT CHRS(7)
RUN
