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download character. You can see how we’ve laid it out in Figure
6-5. Later in this chapter we’ll use this character to create a
small graph.)
E
Tigure 6-4. Use this grid (or one similar to it) to define your owr
m,m,m,m.m,m,m,m,m,m,,m,,
32
16
ASCII Code
Descender
Start column
End column
M, = Descender l 128 + (Start * 161 + End
i
1
Total
draft characters.
You’ll notice that Figure 6-4 includes a lot of informatior
1
around the grid. Don’t be intimidated; we’ll explain each item as
we come to it in our discussion of defining and actually printing
download characters. You may have noticed another difference
between this grid and the one sh.ow in Figure 6-3: it’s only eight
boxes high. Which leads us to . . .
H Rule 1: Draft download characters are eight dots high
As you noticed in Figure 6-2, capital letters, most lowercase
letters, and most special characters use only the top seven pins
of the printhead. Draft download characters can go one better:
they can use as many as eight of the nine wires in the printhead.
So our grid is eight dots high.
It’s also possible to use the bottom eight pins, just as the “g”,
“-73 “ >9
19 P7
“q”, and “y” of the standard character sets do. These
are called descenders (because the bottom of the character
descends below the baseline of the rest of the characters).