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ERASING DOWNLOAD CHARACTER DEFINITIONS
After you have defined a set of characters (a whole new al-
phabet, perhaps) you may want to go back to using mostly
standard characters with a few new user-defined characters mixed
in. Rather than turning SD-lo/l 5 off (which erases all of the
current settings, including download characters), you can send
a command which will restore the default characters.
This
command copies all the characters from the standard character
ROM into download RAM:
(For STAR mode)
<ESC> “9;” 0
(For IBM mode)
<ESC> ‘I:” 0 0 0
Since it will copy all characters into the download area, it will
wipe out any characters that are already there. So it’s important
to send this command to the printer before you send any download
characters you want to define.
DEFINING PROPORTIONAL CHARACTERS
Except for the actual width, defining characters for propor-
tional printing is exactly the same as defining normal width
download characters. Characters can range from 5 to 11 dots
wide. This means that characters can be as narrow as one-half
the normal width.
Besides being able to specify the actual width of the character,
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SD-lo/l5 allows you to specify the position in the standard grid
where the character will print. You must specify the dot column
in which the printed character starts and the dot column in which
the character ends. Why, you may ask, would you want to defme
a character this way instead of merely defining the overall width
of the character? Because SD- 1 O/ 15’s proportional character
definitions can also be used to print normal width characters,
which are eleven dot columns wide. And by centering even the
narrow characters in the complete grid (look at the “i” in Figure
9-12) they will look good even when you aren’t printing them
proportionally.
- _
The command format for proportional character definition is
exactly the same as you have learned; the only difference is the
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