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You may switch between character sets at any time-even in the middle
of a line. To try it, place semicolons at the end of lines 80 and 100 in the
program above.
Copying ROM characters to RAM
After running the program above, if you select the user-defined character
set and try to print other characters, the only one that will print is the
arrow. Since no other characters are in the printer’s user-defined RAM
area, nothing else prints. Other characters don’t even print as spaces; it’s
as if they were not sent at all.
In many cases, you may want to redefine only a few of the characters to
suit your needs; the rest of the alphabet will work fine as it is. As you
have seen, it is possible to switch back and forth between the normal
character set and the user-defined character set. It is, however, rather
inconvenient.
To make things easier, your printer has a command that allows you to
copy all of the standard characters from ROM to the user-defined
character set.
The command format is as follows, where the value of
n
represents the
font family:
ESC : 0
n
0
Note: This command cancels any user-defined characters you have
created. You must send this command to the printer before you define
characters.
If you use this command at the beginning of a program, then define your
special characters and select the user-defined character set, you can print
with the user-defined set as your normal character set. You never need to
switch back and forth between sets.
Letter Quality characters
If you select Letter Quality printing with the ESC xl command, you can
design user-defined characters using up to 29 columns of the Letter
Quality/Proportional grid. The dot columns are spaced closer together
4-30
Using Software and Graphics