diff --git a/BizHawk.Emulation.Cores/Consoles/Atari/lynx/LibLynx.cs b/BizHawk.Emulation.Cores/Consoles/Atari/lynx/LibLynx.cs
index 242410739c..f796d5272f 100644
--- a/BizHawk.Emulation.Cores/Consoles/Atari/lynx/LibLynx.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Atari/lynx/LibLynx.cs
@@ -22,7 +22,7 @@ namespace BizHawk.Emulation.Cores.Atari.Lynx
 		public static extern void Reset(IntPtr s);
 
 		[DllImport(dllname, CallingConvention = cc)]
-		public static extern void Advance(IntPtr s, Buttons buttons, int[] vbuff, short[] sbuff, ref int sbuffsize);
+		public static extern bool Advance(IntPtr s, Buttons buttons, int[] vbuff, short[] sbuff, ref int sbuffsize);
 
 		[DllImport(dllname, CallingConvention = cc)]
 		public static extern bool GetSaveRamPtr(IntPtr s, out int size, out IntPtr data);
diff --git a/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.cs b/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.cs
index 8be37c98ff..8ea08b84d5 100644
--- a/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.cs
@@ -111,8 +111,10 @@ namespace BizHawk.Emulation.Cores.Atari.Lynx
 				LibLynx.Reset(Core);
 
 			int samples = soundbuff.Length;
-			LibLynx.Advance(Core, GetButtons(), videobuff, soundbuff, ref samples);
+			IsLagFrame = LibLynx.Advance(Core, GetButtons(), videobuff, soundbuff, ref samples);
 			numsamp = samples / 2; // sound provider wants number of sample pairs
+			if (IsLagFrame)
+				LagCount++;
 		}
 
 		public int Frame { get; private set; }
diff --git a/lynx/cinterface.cpp b/lynx/cinterface.cpp
index 872d3851c7..9edf3d7699 100644
--- a/lynx/cinterface.cpp
+++ b/lynx/cinterface.cpp
@@ -32,9 +32,9 @@ EXPORT void Reset(CSystem *s)
 	s->Reset();
 }
 
-EXPORT void Advance(CSystem *s, int buttons, uint32 *vbuff, int16 *sbuff, int *sbuffsize)
+EXPORT int Advance(CSystem *s, int buttons, uint32 *vbuff, int16 *sbuff, int *sbuffsize)
 {
-	s->Advance(buttons, vbuff, sbuff, *sbuffsize);
+	return s->Advance(buttons, vbuff, sbuff, *sbuffsize);
 }
 
 EXPORT int GetSaveRamPtr(CSystem *s, int *size, uint8 **data)
diff --git a/lynx/susie.cpp b/lynx/susie.cpp
index 9615efc292..22ba6872da 100644
--- a/lynx/susie.cpp
+++ b/lynx/susie.cpp
@@ -2076,6 +2076,7 @@ uint8 CSusie::Peek(uint32 addr)
 			retval= Modified.Byte;
 		}
 		//			TRACE_SUSIE2("Peek(JOYSTICK)=$%02x at PC=$%04x",retval,mSystem.mCpu->GetPC());
+		lagged = false;
 		return retval;
 		break;
 
@@ -2083,6 +2084,7 @@ uint8 CSusie::Peek(uint32 addr)
 	case (SWITCHES&0xff):
 		retval=mSWITCHES.Byte;
 		//			TRACE_SUSIE2("Peek(SWITCHES)=$%02x at PC=$%04x",retval,mSystem.mCpu->GetPC());
+		lagged = false;
 		return retval;
 
 		// Cartridge reading ports
diff --git a/lynx/susie.h b/lynx/susie.h
index ccd03132d3..470b56e904 100644
--- a/lynx/susie.h
+++ b/lynx/susie.h
@@ -324,9 +324,10 @@ class CSusie : public CLynxBase
 		uint32	ObjectSize(void) {return SUSIE_SIZE;};
 
 		void	SetButtonData(uint32 data) {mJOYSTICK.Byte=(uint8)data;mSWITCHES.Byte=(uint8)(data>>8);};
-		uint32	GetButtonData(void) {return mJOYSTICK.Byte+(mSWITCHES.Byte<<8);};
+		// uint32	GetButtonData(void) {return mJOYSTICK.Byte+(mSWITCHES.Byte<<8);};
 
 		uint32	PaintSprites(void);
+		bool lagged; // set to false whenever joystick/switches are read
 
 	private:
 		void	DoMathDivide(void);
diff --git a/lynx/system.cpp b/lynx/system.cpp
index 833806806d..9114fd29ec 100644
--- a/lynx/system.cpp
+++ b/lynx/system.cpp
@@ -153,12 +153,13 @@ static int Load(MDFNFILE *fp)
 }
 */
 
-void CSystem::Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize)
+bool CSystem::Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize)
 {
 	// this check needs to occur at least once every 250 million cycles or better
 	mMikie->CheckWrap();
 
 	SetButtonData(buttons);
+	mSusie->lagged = true;
 
 	uint32 start = gSystemCycleCount;
 
@@ -183,6 +184,8 @@ void CSystem::Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize)
 
 	mMikie->mikbuf.end_frame((gSystemCycleCount - start) >> 2);
 	sbuffsize = mMikie->mikbuf.read_samples(sbuff, sbuffsize);
+
+	return mSusie->lagged;
 }
 
 
diff --git a/lynx/system.h b/lynx/system.h
index ddbf987dc4..bcaf6b8f36 100644
--- a/lynx/system.h
+++ b/lynx/system.h
@@ -139,7 +139,7 @@ public:
 		}
 	}
 
-	void Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize);
+	bool Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize);
 	bool GetSaveRamPtr(int &size, uint8 *&data) { return mCart->GetSaveRamPtr(size, data); }
 
 	//
@@ -192,7 +192,7 @@ public:
 
 	// Miscellaneous
 	void	SetButtonData(uint32 data) {mSusie->SetButtonData(data);};
-	uint32	GetButtonData() {return mSusie->GetButtonData();};
+	// uint32	GetButtonData() {return mSusie->GetButtonData();};
 	uint8*	GetRamPointer() {return mRam->GetRamPointer();};
 
 public:
diff --git a/output/dll/bizlynx.dll b/output/dll/bizlynx.dll
index 7554c99ebc..d60ab6abce 100644
Binary files a/output/dll/bizlynx.dll and b/output/dll/bizlynx.dll differ