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User-defined Characters
An example will show how to specify
nl
and
n2.
For instance, if you
wanted to redefine the characters A through Z,
nl
would be A (or
ASCII code 65) and
n2
would be Z (or ASCII code 90). So the
command ESC & 0 AZ (followed by the appropriate data) would
replace the entire alphabet of capital letters.
Following the specification of the range of characters to be defined in
this command are three data bytes, d0, dl, and
d2,
that specify the
width of the character and the space around it. The left space (in dot
columns) is specified by d0, and the right space is specified by
d2.
The
second byte, dl, specifies the number of columns of dots that are
printed to make up the character. By varying the width of the character
and the spaces around it, you can create proportional-width characters
that print at draft speed. The table below shows the maximum values
for these bytes.
Mode
d1
d0 + dl + d2
Draft
9
12
Letter Quality
10
cpi
29
36
Letter Quality
12
cpi
23
30
Proportional
37
42
The last part of the command to define your characters is the actual
data that defines the dot patterns for each character. Since it takes three
bytes to specify all the dots in one vertical column, your printer expects
dl x 3 bytes of data to follow d2.
Software and Graphics
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