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Some of you fast students may have noticed that CHR$(69)
is the same as “E”. That’s right, the program will work just as
well if line 10 is changed like this:
10 LPRINT CHR$(27) "E";
That’s just another form of the same ASCII code, and it’s all
the same to SD-10/15.
Here’s another shortcut for BASIC programmers: since
< ESC > is used so often, assign it to a variable. In a long
program, typing ESC$ is much easier than typing CHR$(27) each
time! Now our program looks like this:
c
5 ESC$=CHR$(27)
10 LPRINT ESC$ "E";
c
L..
c..
L
. .
Turn your printer off and back on now, or you will be printing
in emphasized for quite a while!
n Some problem codes
Before we go too far we need to mention some codes that may
cause you problems.
Like most of the subjects in this chapter,
we have to be a little vague because of the differences in com-
puters. Nearly all BASICS change some of the ASCII codes
between your BASIC program and your printer. Some turn
CHR$( 10) (a line feed) into a CHR$( 13) (a carriage return) before
sending it on. Some other problem codes are 0, 7, and 9 through
13.
COMMAND SYNTAX USED IN THIS MANUAL
L-.
*-_
L
Because SD- 10/l 5 users will be running such a wide variety
of applications we just couldn’t show the precise method of
sending printer control codes to SD- 10/l 5 for every one of them!
Instead, as we introduce you to each command, we will show
the commands like this example:
<ESC> "W" 1
.
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