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49
advance the paper to the top of the next form. Line 50 then
prints its message.
After you have run this program,
turn off the printer and ad-
just the top of form position. When you turn the printer back on
the page length will reset to its normal setting (usually 11 in-
ches).
TOP AND BOTTOM MARGINS
Many programs
that you use a printer
don't keep track of
where they are printing
on the page. This causes a problem
when you
get
to the bottom of a page because these programs
just keep on printing, right over the perforation.
This makes it
very hard to read, especially if a line happens to fall right on the
perforation.
And if you separate the pages then you are really in
trouble.
Of course your printer has a solution to this predicament.
This
printer can keep track of the position on the page, and advance
the paper so that you won't print too near the perforation.
There
are two commands
to do this. One controls the space at the top
of the page and the other controls the space at the bottom of the
page. The control codes are given in the following table.
Table
4-5
Top and bottom
margin
commands
Function
Control
code
Set top margin to n lines
(ESC)"r"CHR$(n)
Set bottom margin to n lines
(ESC )"N"CHR$(n)
Cancel top and bottom margins
(ESC)"O"
In both cases the value of n tells your printer how many lines
to skip, although there is a slight difference in the usage. When
you set the top margin with (ESC)"r"CHR$(n),
the value of n
tells the printer what line to start printing on. When you set the
bottom margin with (ESC)"N"CHR$(n),
the value of n tells the
printer how many blank lines should be left at the bottom of the
page.
Let's try a simple application to see how these margins work.
Enter this program,
which will print 150 lines without top and
bottom margins.
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