Unitech PT600, Programming Reference Manual

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regs.h.ah= 0x0b;
int86(0x21,&regs,&regs);
return(regs.h.al);
}
1A LCD Backlight ON/OFF Control
Entry Parameter: AH = 1AH
BH = 0
AL = 0/1 ; set LCD backlight OFF/ON
Return Value: None
Example :
void TL_backlight(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 0;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1A Buzzer ON/OFF Control
Entry Parameter: AH = 1AH
BH = 1
AL = 0/1 ; set Buzzer OFF/ON
Return Value: None
Example :
void TD_buzzer(int status)
{
regs.h.ah= 0x1A;
regs.h.bh= 1;
regs.h.al= (unsigned char)status;
int86(0x21,&regs,&regs);
}
1A Beeper Volume
Entry parameter: AH = 1AH
BH = 3
AL = 0/1/2 ; set LOW/MEDIUM/HIGH beeper
volume
Return Value: None
=2 high