n Vertical tabs
Vertical tabs have the same kinds of uses that horizontal tabs
do - they just work in the other direction. Horizontal tabs
allow you to reach a specific column on the page no matter
where you start from. Vertical tabs are the same. If you have
a vertical tab set at line 20, a vertical tab (or < VT > ) will
move you to line 20 whether you start from line 5 or line 19.
Vertical tabs are not set at the power-on default. If you send
a CHR$( I l), which is the ASCII code for < VT > before we
have set up tabs, the command advances the paper only one
Iine. Enter this program to see how this works.
10 ’ Demo of vertical tabs
40 LPRINT CHR$(ll);"FIRST TAB."
50 LPRINT CHR$(ll);"SECOND TAB."
60 LPRINT CHR$(ll);"THIRD TAB."
70 LPRINT CHR$(ll);"FOURTH TAB."
Now, let’s set some vertical tabs of our own. Add these lines
to the program:
20 LPRINT CHR$(27);"B";CHR$(lOl;CHR$(l5);
3,O LPRINT CHR$i25);CHR$(30l;CHR$(O);
< ESC > “B” is the command to set vertical tabs. Like the
horizontal tab setting command, tab positions must be defined
in ascending order. Our example sets vertical tabs at lines 10,
15, 25 and 30. Then the CHR$(l 1) in each of the following
lines advances the paper to the next vertical tab. The printout
is shown next page.