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Figure 9-l. The letter “C” is created by printing 15 dots.
descenders (such as the lower case “p” shown) use the bottom
seven pins. As the printhead moves across the page (in either
direction-that’s what is meant by bi-directional printing) it prints
one column of dots at a time. Each time a dot is supposed to
print an electromagnet inside the printhead causes the appropriate
wire to strike the ribbon (making the SD-10/l 5 an impact printer).
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Figure 9-2. As the printhead moves across the page, each of the wires
prints one row of dots.
THE PRINT MATRIX
All of the standard characters that the SD-lo/l 5 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 international character sets, the NLQ characters
and the italic characters.
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