Table of Contents
Advertisement
I h
L.
i
113
character.
You can send the character
with the same ASCII
value. You can also access the character from a BASIC program
with the CHR$ function.
In our example, we'll assign the car a value of 60, which is the
code for the character "(" in the ASCII characters.
A rather ar-
bitrary selection, but this printer doesn't care!
Our chart would hardly be complete with just a picture of a
car, so in Figure 7-5 we've made completed
grids for another
symbol: a telephone (quite a strange mix of characters!).
The in-
formation on the grids is now completed.
n Download character
definition command
You've
read
through
a long
explanation
of download
characters
and we haven't even told you the command
syntax
yet! Now the wait is over. This is the most complex command in
your printer
repertoire
and now you've got the necessary
knowledge
to implement
it. Here it is:
(ESC) "&,, CHR$(O) nl n2 m0 ml m2 dl d2 d3 . . . dx
(except for the IBM-P mode)
(ESC) " =" CHR$(O) nl n2 m0 ml m2 dl d2 d3 . . . ak
(only for the IBM-P mode)
Like the other printer's commands,
it starts with an (ESC)
(CHR$(27)). The next character is an ampersand
(&) (CHR$(38))
or an equal (=) (CHR$(Gl)) followed by a CHR$(O).
nl and n2 are used to specify
the ASCII values of the
characters you are defining. The reason that there are two bytes
reserved for this is that your printer allows you to define many
characters with just a single command. nl is used to specify the
beginning of a range of characters to be defined; n2 specifies the
end of the range. For instance, if you wanted to change the ap-
pearance of the numerals from 0 to 9 (which have ASCII codes
48 through
57), the command
would begin with (ESC)
"&"
CHR$(O) CHR$(48)
CHR$(57)
. . (or (ESC)
"="
CHR$(O)
CHR$(48) CHR$(57) ..). Of course,
you can also define in-
dividual characters
by making nl and n2 equal.
The three bytes following the specification
of the range of
Advertisement
Table of Contents
