Epson FX-80 Specifications download pdf (Page 59)

Now RUN it. You should hear a short beep. (If you don’t hear it,

check DIP switch 2-2, using the procedure we gave in Chapter

1.)

That’s the printer’s beeper, which most often sounds to inform you

that you’ve run out of paper (Appendix F lists other causes of beep-

ing). When you produce the beep, you’ve proved that on your com-

puter certain codes do indeed perform printer functions. Table 2-3

shows the ranges that the FX uses when it interprets ASCII codes for

characters and functions.

Table 2-3. ASCII codes on the FX

ASCII

code

FX interpretation

group

0 to 31, 127 Printer control codes

32 to 126 Standard (Roman) character

set

128 to 159,255 Additional control codes (Function same as 0-31 , 127

160 to 254

Italic character set

See either Appendix A or the Quick Reference Card for a chart of

the FX interpretation of each ASCII code number.

This would be a good time to try printing a few of these codes on

your own. And you may want to take a break before you start the

next section.

Escape-CHR$(27)-and other CHR$ commands

As more features are added to the printer, even the extended range

of codes (0 - 255) is inadequate if only single-code CHR$ instructions

can be used. Because of this, Epson has designed the FX printer’s logic

to understand special sequences of control codes, the ESCape code

sequences. You use these code sequences to select one or more printing

features, or modes.

Such modes as Italic Mode and Expanded Mode affect the way the

characters look. Other modes affect spacing and therefore the format-

ting of your pages. Appendix C, which is reprinted on the Quick Ref-

erence Card, collects the modes into categories for quick reference.

Each ESCape code sequence consists of the ESCape code, which is

CHR$(27), plus one or more of the FX’s other CHR$ control codes.

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Epson FX-80 Specifications Page 59