Star Micronics SB-15 user manual 00 0 Eooo, Print Matrix

Figure9-l.The letter“C” iscreatedby printing15dots.

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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Figure9-2.As theprintheadmoves acrossthepage,eachof thewires printsone row ofdots.

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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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