Index: Src/SID.cpp
--- Src/SID.cpp.orig
+++ Src/SID.cpp
@@ -64,6 +64,9 @@ class DigitalPlayer;
 #define ldSINTAB 9			// size of sinus table (0 to 90 degrees)
 #endif
 
+#ifdef USE_SNDIO
+#include <sndio.h>
+#endif
 
 #ifdef USE_FIXPOINT_MATHS
 #include "FixPoint.i"
@@ -374,7 +377,7 @@ class DigitalRenderer : public SIDRenderer { (private)
 	static const uint16 TriSawRectTable[0x100];
 	static const uint32 EGTable[16];	// Increment/decrement values for all A/D/R settings
 	static const uint8 EGDRShift[256]; // For exponential approximation of D/R
-	static const int16 SampleTab[16]; // Table for sampled voice
+	static const uint16 SampleTab[16]; // Table for sampled voice
 
 	DRVoice voice[3];				// Data for 3 voices
 
@@ -481,6 +484,12 @@ class DigitalRenderer : public SIDRenderer { (private)
 	uint8 *sound_buffer;
 	C64 *the_c64;
 #endif
+
+#ifdef USE_SNDIO
+	struct sio_hdl *hdl;
+	int16 *sound_calc_buf;
+#endif
+
 };
 
 // Static data members
@@ -800,7 +809,7 @@ const uint8 DigitalRenderer::EGDRShift[256] = {
 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 };
 
-const int16 DigitalRenderer::SampleTab[16] = {
+const uint16 DigitalRenderer::SampleTab[16] = {
 	0x8000, 0x9111, 0xa222, 0xb333, 0xc444, 0xd555, 0xe666, 0xf777,
 	0x0888, 0x1999, 0x2aaa, 0x3bbb, 0x4ccc, 0x5ddd, 0x6eee, 0x7fff,
 };
@@ -1353,6 +1362,9 @@ void DigitalRenderer::calc_buffer(int16 *buf, long cou
 
 #elif defined(__linux__)
 #include "SID_linux.i"
+
+#elif defined(USE_SNDIO)
+#include "SID_sndio.i"
 
 #elif defined(SUN)
 #include "SID_sun.i"