Added original source code

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

WOLFSRC/DETECT.C

@@ -0,0 +1,87 @@
+///////////////////////////////////////////////////////////////////////////
+//
+//	SDL_CheckSB() - Checks to see if a SoundBlaster resides at a
+//		particular I/O location
+//
+///////////////////////////////////////////////////////////////////////////
+static boolean
+SDL_CheckSB(int port)
+{
+	int	i;
+
+	sbLocation = port << 4;		// Initialize stuff for later use
+
+	sbOut(sbReset,true);		// Reset the SoundBlaster DSP
+asm	mov	dx,0x388				// Wait >4usec
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+asm	in	al, dx
+
+	sbOut(sbReset,false);		// Turn off sb DSP reset
+asm	mov	dx,0x388				// Wait >100usec
+asm	mov	cx,100
+usecloop:
+asm	in	al,dx
+asm	loop usecloop
+
+	for (i = 0;i < 100;i++)
+	{
+		if (sbIn(sbDataAvail) & 0x80)		// If data is available...
+		{
+			if (sbIn(sbReadData) == 0xaa)	// If it matches correct value
+				return(true);
+			else
+			{
+				sbLocation = -1;			// Otherwise not a SoundBlaster
+				return(false);
+			}
+		}
+	}
+	sbLocation = -1;						// Retry count exceeded - fail
+	return(false);
+}
+
+///////////////////////////////////////////////////////////////////////////
+//
+//	Checks to see if a SoundBlaster is in the system. If the port passed is
+//		-1, then it scans through all possible I/O locations. If the port
+//		passed is 0, then it uses the default (2). If the port is >0, then
+//		it just passes it directly to SDL_CheckSB()
+//
+///////////////////////////////////////////////////////////////////////////
+static boolean
+SDL_DetectSoundBlaster(int port)
+{
+	int	i;
+
+	if (port == 0)					// If user specifies default, use 2
+		port = 2;
+	if (port == -1)
+	{
+		if (SDL_CheckSB(2))			// Check default before scanning
+			return(true);
+
+		if (SDL_CheckSB(4))			// Check other SB Pro location before scan
+			return(true);
+
+		for (i = 1;i <= 6;i++)		// Scan through possible SB locations
+		{
+			if ((i == 2) || (i == 4))
+				continue;
+
+			if (SDL_CheckSB(i))		// If found at this address,
+				return(true);		//	return success
+		}
+		return(false);				// All addresses failed, return failure
+	}
+	else
+		return(SDL_CheckSB(port));	// User specified address or default
+}
+
+