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User-defined Characters
Run the program to see the printout below.
;:;;:
oiiro
;;;y5
As you can see, both sets of characters (the original ROM
characters that the printer normally uses and the user-defined
character set) remain in the printer available for your use. The
command to switch between the two sets is used in line 180 and
200.
It is:
ESC % n
If n is equal to
0, the normal ROM character set is selected (this is
the default). If
n
is equal to
1,
the user-defined character set is
selected. If you select the user-defined character set before you
have defined any characters, the command is ignored and the
ROM characters remain in use.
You may switch between character sets at any time, even in the
middle of a line. To try this, place semicolons at the end of lines
170
and
190
in the preceding program.
Copying ROM characters to RAM
After running the previous sample program, if you select the
user-defined character set and try to print other characters, only
the heart will print. Since no other characters are in the printer’s
user-defined RAM area, other characters print as spaces.
In many cases, you will 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 at will between the normal character set and user-defined
character set. It is, however, rather inconvenient.
Therefore, your printer has a command that allows you to copy all
of the standard characters from ROM to the user-defined character
set.
Software and Graphics
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