Unitech PT630, Programming Reference Manual

Page: 51 / 73

PT630 Programming Reference Guide Page 51 of 59
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1.7 Beeper Control Function ( INT 31H )
Entry Parameter:
AX= frequency BX=time duration
AX Frequency(Hz) BX Time Duration(ms)
0 200 0 10
1 400 1 50
2 600 2 100
3 800 3 200
4 1K 4 500
5 2K 5 800
6 2.5K 6 1K
7 3K 7 1.5K
7 5K 8 2K
Return Value: None
Example
:
void TD_beep_new(int fz,int tm)
{
regs.x.ax = fz;
regs.x.bx = tm;
int86(0x31,&regs,&regs);
}