84
The following program shows how these codes work.
10LPRINT "BACKSPACEDOES NOT";
20LPRINT CHR$(8);CHR$(B);CHR$(8);
30LPRINT 'I=== WORK"
40 LPRINT "DELETE DOES NOT";
50LPRINT CHR$(127);CHR$(127);CHR$(127);
60LPRINT "WORK"
70LPRINT "CANCEL LINE";
80 LPRINT CHRs(24);
90LPRINT "DOES NOT WORK"
Here is what this program will print:
The backspace codes in line 20 move the printhead a total of three spaces to the left so that the first part of line 30 will overprint the word “NOT”. The delete codes in line 50 “erase” the three letters in the word “NOT” so that it doesn’t even print.
In line 80, CHR$(24) deletes the words in line 70. The semicolon at the end of line 70 prevents a line feed from causing that line to print before the printer receives the CHR$(24) code. The‘text in line 90 prints as it normally would because it is after CHR$(24).
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n Printing zeroes
There are two types of zeroes. There is the one we use every day - 0 - and this is what your printer will print as its default.
The other type is used almost exclusively in computers and
engineering. It is called the “slash zero” and is written like this - fl. The line through the number prevents you from misreading it as the letter “0”. Before
