Category : Assembly Language Source Code
Archive   : C--C0200.ZIP
Filename : SOUND.H--

 
Output of file : SOUND.H-- contained in archive : C--C0200.ZIP

/*
SPHINX Programming (C) 1993.
TITLE: SOUND.H--
DESCRIPTION: This file contains a collection of procedures for using
the built in PC speaker.
LAST MODIFIED: 13 May 1993
PROCEDURES DEFINED IN THIS FILE:
: void NOSOUND()
: void SOUND(frequency)
*/


: void NOSOUND ()
/*
Silences the speaker.
*/
{
$IN AL,0x61
AL &= 0xFC;
$OUT 0x61,AL
}
/* RETURNS: AL = undefined
*/



: void SOUND () /* AX = frequency */
/*
Starts the speaker emiting a sound of a given frequency
*/
{
BX = AX;
DX = 0x12;
AX = 0x34DC;
$DIV BX
BL = AL;
AL = 0xB6;
$OUT 0x43,AL
AL = BL;
$OUT 0x42,AL
AL = AH;
$OUT 0x42,AL
$IN AL,0x61
AL |= 3;
$OUT 0x61,AL
}
/* RETURNS: AX,BX,DX = undefined
*/


/* end of SOUND.H-- */