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74 | Delta User’s Manual | ._ |
Dot Matrix Printing
In order to create download characters, you’ll need some understanding of how dot matrix printers work. They’re called “dot matrix” because each character is made up of a group of dots. Look closely at some printed characters produced by your Delta and vou will see the dots. Figure
Figure |
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The printhead in Delta consists of nine thin wires stacked one |
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atop the other. Figure |
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the front of the printhead, showing the ends of the wires and their | - | |||
relationship | to the printed characters. As you can see, the capital | |||
letters use the top seven wires of the printhead, and the descen- |
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ders (such | as the lower case | “g” | shown) use the bottom seven | |
pins. As the printhead moves | across | the page (in either direction- | - |
that’s what is meant by
The Print Matrix
All of the standard characters that Delta prints are formed from patterns of dots that are permanently stored in the printer’s ROM
But there is another area of memory in Delta reserved for