Star Micronics NB-15 User Manual page 98

Star micronics printer user's manual

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Figure 8-1 shows an enlarged schematic

view of the front of

the printhead,

showing the ends of the wires and their relation-

ship to the draft characters.

As you can see, the capital letters

use the top eighteen wires of the printhead,

and the descenders

(such as the lower case "p" shown) use the bottom

eighteen

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 this printer an impact printer).

?igure 8-l.

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 this printer prints are form-

ed from patterns

of dots that are permanently

stored in the

printer's

ROM (read-only

memory).

This includes

all of the

standard ASCII characters,

and special characters,

the interna-

tional character

sets, and the LQ characters.

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