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Creating Your Own Characters
111
The Print Matrix
All of the standard characters that Radix prints are formed
from patterns of dots that are permanently stored in the printer's
ROM (read-only memory). This includes all of the standard ASCII
characters, the block graphics and special characters, the interna-
tional character sets, the NLQ characters and the italic characters.
But there is another area of memory in Radix reserved for
g
0
0
I
g
g
0
0.0.
:
.
:-
l a.e
0
0
0
:
. l e.a
0
00
0
0
....
:-
l o.e
0
Figure 11-2. As the printhead moves across the page, each of the wires prints one
row of dots.
userdefied characters. These are characters that you design and
download into Radix. When download characters are defined they
are stored in RAM (random access memory), which allows you to
define or modify them at any time.
Each of these characters, whether it is from the standard charac-
ter ROM or in download RAM, is constructed on a grid which is six
"boxes" wide by nine 'boxes" high. The dots used to print a charao
ter can be inside any of the boxes. In addition, a dot can straddle any
of the vertical lines. As an example, take a look at the enlarged "9"
superimposed on the grid in Figure 11-3. As you can see, some dots
are inside the boxes, and some are centered on the vertical lines.
This, in effect, makes the character grid
11
dots wide by 9 dots high.
To see how the rest of the characters in the standard character ROM
are constructed, take a look at Appendix J.
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