diff --git a/AppleWinExpress2013.vcxproj b/AppleWinExpress2013.vcxproj
index 87520852..24be103a 100644
--- a/AppleWinExpress2013.vcxproj
+++ b/AppleWinExpress2013.vcxproj
@@ -125,6 +125,7 @@
     <ClCompile Include="source\Configuration\PropertySheet.cpp" />
     <ClCompile Include="source\Configuration\PropertySheetHelper.cpp" />
     <ClCompile Include="source\CPU.cpp" />
+    <ClCompile Include="source\DAC.cpp" />
     <ClCompile Include="source\Debugger\Debug.cpp" />
     <ClCompile Include="source\Debugger\Debugger_Assembler.cpp" />
     <ClCompile Include="source\Debugger\Debugger_Color.cpp" />
diff --git a/source/Memory.cpp b/source/Memory.cpp
index 3868e0b2..d7f1641e 100644
--- a/source/Memory.cpp
+++ b/source/Memory.cpp
@@ -51,6 +51,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #include "..\resource\resource.h"
 #include "Configuration\PropertySheet.h"
 #include "Debugger\DebugDefs.h"
+#include "DAC.h"
 
 // Memory Flag
 #define  MF_80STORE    0x00000001
@@ -1294,6 +1295,8 @@ void MemInitialize()
 	{
 		ConfigureSoftcard(pCxRomPeripheral, 5);		// $C500 : Z80 card
 	}
+        else
+         ConfigureDAC(pCxRomPeripheral, 5);		// $C500 : Z80 card
 
 	DiskLoadRom(pCxRomPeripheral, 6);				// $C600 : Disk][ f/w
 	HD_Load_Rom(pCxRomPeripheral, 7);				// $C700 : HDD f/w
diff --git a/source/Speaker.cpp b/source/Speaker.cpp
index 3608ecd6..45f9d0c0 100644
--- a/source/Speaker.cpp
+++ b/source/Speaker.cpp
@@ -51,11 +51,6 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 // their buffers are running low.
 //
 
-#define  SOUND_NONE    0
-#define  SOUND_DIRECT  1
-#define  SOUND_SMART   2
-#define  SOUND_WAVE    3
-
 static const unsigned short g_nSPKR_NumChannels = 1;
 static const DWORD g_dwDSSpkrBufferSize = MAX_SAMPLES * sizeof(short) * g_nSPKR_NumChannels;
 
@@ -66,18 +61,20 @@ static short*	g_pSpeakerBuffer = NULL;
 // Globals (SOUND_WAVE)
 const short		SPKR_DATA_INIT = (short)0x8000;
 
-static short	g_nSpeakerData	= SPKR_DATA_INIT;
+short		g_nSpeakerData	= SPKR_DATA_INIT;
 static UINT		g_nBufferIdx	= 0;
 
 static short*	g_pRemainderBuffer = NULL;
 static UINT		g_nRemainderBufferSize;		// Setup in SpkrInitialize()
 static UINT		g_nRemainderBufferIdx;		// Setup in SpkrInitialize()
 
-
 // Application-wide globals:
 DWORD			soundtype		= SOUND_WAVE;
 double		    g_fClksPerSpkrSample;		// Setup in SetClksPerSpkrSample()
 
+// Allow temporary quietening of speaker (8 bit DAC)
+UINT		    g_quieterSpeaker = 0;
+
 // Globals
 static DWORD	lastcyclenum	= 0;
 static DWORD	toggles			= 0;
@@ -447,7 +444,19 @@ BYTE __stdcall SpkrToggle (WORD, WORD, BYTE, BYTE, ULONG nCyclesLeft)
 
 	  UpdateSpkr();
 
-	  g_nSpeakerData = ~g_nSpeakerData;
+          // quieten the speaker if 8 bit DAC in use
+          
+	  // g_nSpeakerData = ~g_nSpeakerData;
+          if (g_quieterSpeaker)
+           if (g_nSpeakerData == (SPKR_DATA_INIT >> 2))
+            g_nSpeakerData = ~g_nSpeakerData;
+           else
+            g_nSpeakerData = SPKR_DATA_INIT>>2;
+          else
+           if (g_nSpeakerData == SPKR_DATA_INIT)
+            g_nSpeakerData = ~g_nSpeakerData;
+           else
+            g_nSpeakerData = SPKR_DATA_INIT;
   }
   else if (soundtype != SOUND_NONE)
   {
@@ -993,6 +1002,7 @@ static void Spkr_SetActive(bool bActive)
 		// Called by SpkrUpdate() after 0.2s of speaker inactivity
 		g_bSpkrRecentlyActive = false;
 		SpeakerVoice.bRecentlyActive = false;
+                g_quieterSpeaker = 0;  // undo any muting (for 8 bit DAC)
 	}
 }
 
diff --git a/source/Speaker.h b/source/Speaker.h
index 8e93fbbe..c2ee9c95 100644
--- a/source/Speaker.h
+++ b/source/Speaker.h
@@ -1,7 +1,14 @@
 #pragma once
 
+#define  SOUND_NONE    0
+#define  SOUND_DIRECT  1
+#define  SOUND_SMART   2
+#define  SOUND_WAVE    3
+
 extern DWORD      soundtype;
 extern double     g_fClksPerSpkrSample;
+extern UINT       g_quieterSpeaker;
+extern short      g_nSpeakerData;
 
 void    SpkrDestroy ();
 void    SpkrInitialize ();
@@ -23,3 +30,5 @@ DWORD   SpkrGetSnapshot(SS_IO_Speaker* pSS);
 DWORD   SpkrSetSnapshot(SS_IO_Speaker* pSS);
 
 BYTE __stdcall SpkrToggle (WORD pc, WORD addr, BYTE bWrite, BYTE d, ULONG nCyclesLeft);
+
+