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print position. Instead, they define two basic units you can use in print
position commands.
What’s important about the space is that it defines how far the print position
travels for every character you print (except for proportionally spaced text).
The space can also be thought of as the width of a vertical print column. One
column width is the width of the space character in the curmnt font, no matter
whether it is monospaced or proportionally spaced.
Occasionally you may want to change space width to override the current
pitch setting. Let’s look at an example. The space width comes in units of
1/12Oth of an inch, and the Courier font can print 10 characters per inch. Each
charactercoversa tenth- 12/12Oths-ofaninch, so that font’sdefault space
width is 12 units. If we change its space width to 6, each character would half-
overlap the one before it.
If you are using <SIB and <SO> to shift between a primary and secondary
font, it’s a good idea to change the space width after every shift.
To change the space width you send this command:
&SC> &k n H
in which for n you can enter a number fmm 0 (zero) to 840. A width of 0 will
print characters on top of each other; a width of 840 will print them seven
inches aprt.
Defining line depth
me line depth (sometimes called the “vertical motion index”) specifies how
far down a page the print position will move for each line feed. You probably
won’t use the line depth as much as lines-per-inch. Line depth can be more
precise but it isn’t as easy to calculate. The line depth comes in multiples of
l/4801 of an inch.
The important fact about the line depth is that when you change it you are
changing the actual meaning of a “line”. When you increase the line depth
you effectively decrease the number of lines per inch, and increase the page
length.
The command you send to set the line depth looks like this:
<ESC> &z/n C
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