IBM Personal Computer AT Manual To Operations page 220

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ESCP
Proportional Spacing
Format: ESC P;n;
Starts proportional spacing when n is 1.
Stops proportional spacing when n is O.
Proportional spacing gives each different
character a different amount of space on
the line. That is, narrow characters, such as
~
i, are given a small amount of space on the
line relative to a broader character, such as
M. This is similar to the way people write
characters and gives a more balanced look
to the text. Most books are printed in
proportional spacing, as is this one.
The distance of a forward space is 10 units;
the distance of a backspace is determined
by the last printed character or space, if the
printing of the character or the space was
the last carriage movement.
Normal processing of all control codes
continues during proportional spacing.
Note: The Color Printer operates only
on the least significant bit of n.
~
Therefore, any odd-numbered ASCII
decimal value gives the same result as
n=l, and any even-numbered ASCII
decimal value gives the same result as
n=O.
LPRINT CHR$(27);CHR$(80);CHR$(n);
1-110 Color Printer

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