Epson FX-80 User Manual page 54

2-2: controls the beeper. When it is ON, the beeper sounds
Switch
when it receives a CHR$(7) or to indicate the paper has run out. When
it is OFF, CHR$(7) or paper-out doesn't sound beeper.
For printer detected error other than paper-out sensing (for which
1-3
switch must also be set), the beeper will sound regardless of the
setting of switch 2-2.
2-1: selects the printer. When it is ON, it activates the SLCT IN
Switch
signal and the printer actively processes commands sent from the
computer; it cannot be deactivated with software codes. When it is
OFF, the printer can be activated and deactivated by external software
codes. CHR$(17) (DCl) activates or turns on printing, and CHR$(19)
(DC3) deactivates or turns off printing. While the printer is inactive,
all input data is ignored (until the printer is reactivated by CHR$(17)).
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