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Line 40 changes the line spacing. The command (ESC) “A”
CHR$(n) changes the line spacing to n/72 of an inch. The loop
that is started in line 20 increases the value of n (the variable I in
this program) each time it is executed. So the line spacing in-
creases as the program continues. Line 30 just shortcuts the
loop’when I = 13, since BASIC won’t let us send CHR$(13)
without adding an unwanted CHR$(1O)to it. Finally, the (ESC)
“2” in line 80 resets the line spacing to 6 lines per inch. This is a
shortcut that is the same as (ESC) “A” CHR$(12).
If you run this program with DIP switch 2-5 off (IBM mode),
you cannot get the printout as shown above.
The (ESC) “A” CHR$(n) command in the IBM mode only
defines the line spacing as n/72 of an inch; the (ESC) “2” com-
mand “changes the line spacing to the amount defined by the
previous (ESC) “A”.
For the IBM mode, you need to change the following lines in
the previous program as shown below:
4(I LFRINT CtiR$(27);“A”;CHR$(I);CHR$(27);“2”;
80 LPRINT CHR$(27);“A”;CHR$(12);CHR$(27);“2”
You may wonder why 1/72 of an inch was chosen as the incre-
ment for the line spacing command. There’s a good reason: the
dots that the printer makes are 1/72 inch apart. So this means
that you can vary the line spacing in increments as fine as one
dot – unless you want finer spacing, in which case you may use
one third dot spacing.
The (ESC) “3” CHR$(n) command sets the line spacing in in-
crements of 1/216 inch. Change line 40 in your program to this:
40 LI’RINTCHR$ (27);“3”;CHR$ (I);
and run the program again. Now the results will look like this: