Line 30 changes the line spacing. The command < ESC > “A”
CHR$(n) changes the line spacing to n/72 of an inch. The loop
that is started in line 10 increases the value of n (the variable I
in the program) each time it is executed. So the line spacing in-
creases as the program continues. Line 20 just shortcuts the loop
when I = 13, since BASIC won’t let us send CHR$( 13) without
adding an unwanted CHR$( 10) to it. Finally, the < ESC > “2”
in line 60 resets the line spacing to 6 lines per inch. This is a
shortcut that is the same as < ESC > “A” CHR$(12).
When you run this program with IBM mode, you cannot get
the printout as shown above.
The command < ESC> “A” CHR$(n) in IBM mode only
defines the line spacing as n/72 of an inch; the < ESC > “2”
command changes the line spacing to the amount defind by the
previous < ESC > “A”.
-
-
-
So, you need to change the following lines to the previous
program as shown below for the IBM mode:
-
-
30 LPRINT CHR$(27) "A" CHR$(I); : LPRINT CHR$(27) --
II II.
2 ,
79 LPRINT CHR$(27) "A" CHR$(12); : LPRINT CHR$(27)
fl 11
2
You may wonder why they picked l/72 of an inch as the in-
crement for the line spacing command. There’s a good reason:
the dots that the printer makes are l/72 inch apart. So this means
that you can vary the line spacing in increments as line as one
dot-unless you want finer spacing, like one half dot spacing
(STAR mode) or one third dot spacing (IBM mode).
The < ESC > “3” CHR$(n) command sets the line spacing in
increments of l/ 144 inch (STAR mode) or i/216 inch (IMB mode).
Change line 30 in your program so it is like this:
__
-
30 LPRINT CHR$(27) "3" CHR$(I);
and run the program again. Now the results will look like this:
-
-
50
