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Creating Your Own Characters 75
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igure 7-2. As the printhead moves across the page, each of the wires prints one
row of dots.
user-defined characters. These are characters that you design and
download into Delta. 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 charac-
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 7-3. 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.
Figure 7-3. Dots can be inside boxes or straddle the vertical lines of the grid.