diff --git a/src/cpu/core_full/op.h b/src/cpu/core_full/op.h
index bfcb90d..6c1ebc4 100644
--- a/src/cpu/core_full/op.h
+++ b/src/cpu/core_full/op.h
@@ -584,9 +584,13 @@ switch (inst.code.op) {
 		SETFLAGBIT(CF,(inst_op1_d & (1 << (inst_op2_d & 31))));
 		inst_op1_d&=~(1 << (inst_op2_d & 31));
 		break;
-	case O_BSWAP:
+	case O_BSWAPw:
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegalopcode;
-		BSWAP(inst_op1_d);
+		BSWAPW(inst_op1_w);
+		break;
+	case O_BSWAPd:
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegalopcode;
+		BSWAPD(inst_op1_d);
 		break;
 	case O_CMPXCHG:
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486NEWSLOW) goto illegalopcode;
diff --git a/src/cpu/core_full/optable.h b/src/cpu/core_full/optable.h
index 39907e0..a938a8f 100644
--- a/src/cpu/core_full/optable.h
+++ b/src/cpu/core_full/optable.h
@@ -321,10 +321,10 @@ static OpCode OpCodeTable[1024]={
 {0			,0			,0		,0		},{0		,0			,0		,0		},
 {0			,0			,0		,0		},{0		,0			,0		,0		},
 /* 0x1c8 - 0x1cf */
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_AX},{L_REGd	,O_BSWAP	,S_REGd	,REGI_CX},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_DX},{L_REGd	,O_BSWAP	,S_REGd	,REGI_BX},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_SP},{L_REGd	,O_BSWAP	,S_REGd	,REGI_BP},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_SI},{L_REGd	,O_BSWAP	,S_REGd	,REGI_DI},
+{L_REGw		,O_BSWAPw	,S_REGw	,REGI_AX},{L_REGw	,O_BSWAPw	,S_REGw	,REGI_CX},
+{L_REGw		,O_BSWAPw	,S_REGw	,REGI_DX},{L_REGw	,O_BSWAPw	,S_REGw	,REGI_BX},
+{L_REGw		,O_BSWAPw	,S_REGw	,REGI_SP},{L_REGw	,O_BSWAPw	,S_REGw	,REGI_BP},
+{L_REGw		,O_BSWAPw	,S_REGw	,REGI_SI},{L_REGw	,O_BSWAPw	,S_REGw	,REGI_DI},
 
 /* 0x1d0 - 0x1d7 */
 {0			,0			,0		,0		},{0		,0			,0		,0		},
@@ -677,10 +677,10 @@ static OpCode OpCodeTable[1024]={
 {0			,0			,0		,0		},{0		,0			,0		,0		},
 {0			,0			,0		,0		},{0		,0			,0		,0		},
 /* 0x3c8 - 0x3cf */
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_AX},{L_REGd	,O_BSWAP	,S_REGd	,REGI_CX},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_DX},{L_REGd	,O_BSWAP	,S_REGd	,REGI_BX},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_SP},{L_REGd	,O_BSWAP	,S_REGd	,REGI_BP},
-{L_REGd		,O_BSWAP	,S_REGd	,REGI_SI},{L_REGd	,O_BSWAP	,S_REGd	,REGI_DI},
+{L_REGd		,O_BSWAPd	,S_REGd	,REGI_AX},{L_REGd	,O_BSWAPd	,S_REGd	,REGI_CX},
+{L_REGd		,O_BSWAPd	,S_REGd	,REGI_DX},{L_REGd	,O_BSWAPd	,S_REGd	,REGI_BX},
+{L_REGd		,O_BSWAPd	,S_REGd	,REGI_SP},{L_REGd	,O_BSWAPd	,S_REGd	,REGI_BP},
+{L_REGd		,O_BSWAPd	,S_REGd	,REGI_SI},{L_REGd	,O_BSWAPd	,S_REGd	,REGI_DI},
 
 /* 0x3d0 - 0x3d7 */
 {0			,0			,0		,0		},{0		,0			,0		,0		},
diff --git a/src/cpu/core_full/support.h b/src/cpu/core_full/support.h
index 5928740..7a0c4dc 100644
--- a/src/cpu/core_full/support.h
+++ b/src/cpu/core_full/support.h
@@ -94,7 +94,8 @@ enum {
 	O_BTd,O_BTSd,O_BTRd,O_BTCd,
 	O_BSFw,O_BSRw,O_BSFd,O_BSRd,
 
-	O_BSWAP,O_CMPXCHG,
+	O_BSWAPw, O_BSWAPd,
+	O_CMPXCHG,
 	O_FPU
 
 
diff --git a/src/cpu/core_normal/prefix_0f.h b/src/cpu/core_normal/prefix_0f.h
index ff80988..b234023 100644
--- a/src/cpu/core_normal/prefix_0f.h
+++ b/src/cpu/core_normal/prefix_0f.h
@@ -588,28 +588,28 @@
 			else {GetEAa;*rmrw=LoadMw(eaa);SaveMw(eaa,LoadMw(eaa)+oldrmrw);}
 			break;
 		}
-	CASE_0F_B(0xc8)												/* BSWAP EAX */
+	CASE_0F_W(0xc8)												/* BSWAP AX */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_eax);break;
-	CASE_0F_B(0xc9)												/* BSWAP ECX */
+		BSWAPW(reg_ax);break;
+	CASE_0F_W(0xc9)												/* BSWAP CX */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_ecx);break;
-	CASE_0F_B(0xca)												/* BSWAP EDX */
+		BSWAPW(reg_cx);break;
+	CASE_0F_W(0xca)												/* BSWAP DX */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_edx);break;
-	CASE_0F_B(0xcb)												/* BSWAP EBX */
+		BSWAPW(reg_dx);break;
+	CASE_0F_W(0xcb)												/* BSWAP BX */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_ebx);break;
-	CASE_0F_B(0xcc)												/* BSWAP ESP */
+		BSWAPW(reg_bx);break;
+	CASE_0F_W(0xcc)												/* BSWAP SP */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_esp);break;
-	CASE_0F_B(0xcd)												/* BSWAP EBP */
+		BSWAPW(reg_sp);break;
+	CASE_0F_W(0xcd)												/* BSWAP BP */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_ebp);break;
-	CASE_0F_B(0xce)												/* BSWAP ESI */
+		BSWAPW(reg_bp);break;
+	CASE_0F_W(0xce)												/* BSWAP SI */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_esi);break;
-	CASE_0F_B(0xcf)												/* BSWAP EDI */
+		BSWAPW(reg_si);break;
+	CASE_0F_W(0xcf)												/* BSWAP DI */
 		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
-		BSWAP(reg_edi);break;
+		BSWAPW(reg_di);break;
 		
diff --git a/src/cpu/core_normal/prefix_66_0f.h b/src/cpu/core_normal/prefix_66_0f.h
index 1563050..b8aee89 100644
--- a/src/cpu/core_normal/prefix_66_0f.h
+++ b/src/cpu/core_normal/prefix_66_0f.h
@@ -439,3 +439,27 @@
 			else {GetEAa;*rmrd=LoadMd(eaa);SaveMd(eaa,LoadMd(eaa)+oldrmrd);}
 			break;
 		}
+	CASE_0F_D(0xc8)												/* BSWAP EAX */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_eax);break;
+	CASE_0F_D(0xc9)												/* BSWAP ECX */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_ecx);break;
+	CASE_0F_D(0xca)												/* BSWAP EDX */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_edx);break;
+	CASE_0F_D(0xcb)												/* BSWAP EBX */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_ebx);break;
+	CASE_0F_D(0xcc)												/* BSWAP ESP */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_esp);break;
+	CASE_0F_D(0xcd)												/* BSWAP EBP */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_ebp);break;
+	CASE_0F_D(0xce)												/* BSWAP ESI */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_esi);break;
+	CASE_0F_D(0xcf)												/* BSWAP EDI */
+		if (CPU_ArchitectureType<CPU_ARCHTYPE_486OLDSLOW) goto illegal_opcode;
+		BSWAPD(reg_edi);break;
diff --git a/src/cpu/instructions.h b/src/cpu/instructions.h
index e224d42..cb1df6b 100644
--- a/src/cpu/instructions.h
+++ b/src/cpu/instructions.h
@@ -956,5 +956,8 @@
 	save(op1,lf_resd);											\
 	lflags.type=t_DSHRd;
 
-#define BSWAP(op1)														\
+#define BSWAPW(op1)														\
+	op1 = 0;
+
+#define BSWAPD(op1)														\
 	op1 = (op1>>24)|((op1>>8)&0xFF00)|((op1<<8)&0xFF0000)|((op1<<24)&0xFF000000);
diff --git a/src/dos/cdrom_image.cpp b/src/dos/cdrom_image.cpp
index e85a5e8..f1dd979 100644
--- a/src/dos/cdrom_image.cpp
+++ b/src/dos/cdrom_image.cpp
@@ -227,11 +227,19 @@ bool CDROM_Interface_Image::GetMediaTrayStatus(bool& mediaPresent, bool& mediaCh
 
 bool CDROM_Interface_Image::PlayAudioSector(unsigned long start,unsigned long len)
 {
+	// We might want to do some more checks. E.g valid start and length
 	SDL_mutexP(player.mutex);
 	player.cd = this;
 	player.currFrame = start;
 	player.targetFrame = start + len;
-	player.isPlaying = true;
+	int track = GetTrack(start) - 1;
+	if(track >= 0 && tracks[track].attr == 0x40) {
+		LOG(LOG_MISC,LOG_WARN)("Game tries to play the data track. Not doing this");
+		player.isPlaying = false;
+		//Unclear wether return false should be here. 
+		//specs say that this function returns at once and games should check the status wether the audio is actually playing
+		//Real drives either fail or succeed as well
+	} else player.isPlaying = true;
 	player.isPaused = false;
 	SDL_mutexV(player.mutex);
 	return true;
@@ -239,6 +247,7 @@ bool CDROM_Interface_Image::PlayAudioSector(unsigned long start,unsigned long le
 
 bool CDROM_Interface_Image::PauseAudio(bool resume)
 {
+	if (!player.isPlaying) return false;
 	player.isPaused = !resume;
 	return true;
 }
diff --git a/src/dos/cdrom_ioctl_win32.cpp b/src/dos/cdrom_ioctl_win32.cpp
index 0f60cfb..60d9d3c 100644
--- a/src/dos/cdrom_ioctl_win32.cpp
+++ b/src/dos/cdrom_ioctl_win32.cpp
@@ -430,6 +430,7 @@ bool CDROM_Interface_Ioctl::PauseAudio(bool resume) {
 		return false;
 	}
 	if (use_dxplay) {
+		if (!player.isPlaying) return false;
 		player.isPaused = !resume;
 		return true;
 	}
diff --git a/src/hardware/serialport/serialport.cpp b/src/hardware/serialport/serialport.cpp
index 16fe4a8..b6a310a 100644
--- a/src/hardware/serialport/serialport.cpp
+++ b/src/hardware/serialport/serialport.cpp
@@ -1065,6 +1065,7 @@ void CSerial::Init_Registers () {
 	Write_LCR (lcrresult);
 	updateMSR();
 	Read_MSR();
+	PIC_DeActivateIRQ(irq);
 }
 
 CSerial::CSerial(Bitu id, CommandLine* cmd) {