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Line 50 actually sends the messages down the line to the printer. The
expression inside the CHR$ function looks complicated, but that's just to
keep your atention. Observe its form, but ignore its contents. We'll have to
study the whole manual to find out how to generate such a pretty line of
graphics.
Add line 50:
5 0 P R I N T C H R $ ( 2 ^ I N T ( 3 . 4 * S I N ( I ) + l ) ) ) ;
and RUN.
Isn't that slick? It gets even better when we understand how to design our own.
The Finale
Only 1 more easy line. It's downhill now.
Line 70 starts out with a TAB and two character codes. It's back to the
ASCII chart, Appendix A to see that 98 and 121 are the codes for lower
case b and y. We've already used CHR$ (14) and seen that it puts the
printer in double width mode.
Add line 70:
70 PRINTTAB (20) CHR$ (98) CHR$ (l2l) CHR$ (l4)" EPSON"
and RUN. Very nice.
This has been a feature-packed chapter, but it gave us a good introduction to
some varied and powerful capabilities we can put to work. Better take a break
before tackling Chapter 3. It wouldn't hurt to go through this chapter once more
before moving on, now that we know the plot.
Print Command Codes Learned so Far
CHR$ (14) - Turns ON double-width characters.
(Goes OFF by self after end of line)
Send it a Message
21
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