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76
90 LPRINT CHR$(24);
I
100 LPRINT "DOES NOT WORK"
Here is what this program will print:
BACKSPACE DOES NM WORK
DELETE DOES WORK
DOES NOT WORK
The backspace codes in line 30 move the printhead a total of
three spaces to the left so that the first part of line 40 will over-
print the word “NOT”. The delete codes in line 60 “erase” the
three letters in the word “NOT” so that it doesn’t even print.
In line 90, CHR$(24) deletes the words in line 80. The
semicolon at the end of line 80 prevents a line feed from causing
that line to print before the printer receives the CHR$(24) code.
The text in line 100 prints as it normally would because it is
after CHR$(24).
n Immediate-print
This printer can print at fine rate of 250 characters per sec-
ond. But it will also print more slowly at the speed of your typ-
ing. In immediate-$rint mode, the printhead prints one character
at a time, as you send it. This printer also moves the paper up so
that you can see the current line and then down to continue
printing.
You can turn immediate-print mode on with (ESC) “i” 1. But
before looking at it, let’s review the normal operation of the
print buffer. Enter this program.
20 A$="" :INPLJT
w TYPE A CHARACTER ",A$
30 IF A$="" THEN 50
40 LPRINT A$; : GOT0 20
50 LPRINT
: LPRINT CHR$(27);"@"
Now type several characters, and after each press the
RETURN key. True to form, the printer just stuffs the
characters into its buffer while it waits for a carriage return
code. (In this program the RETURN key doesn’t send a car-