Star Micronics SB-15 0.0. : . 0 :- 0.0. : 0 : .

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).

0.0. : . 0 :- 0.0. : 0 : .

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.