diff --git a/Source/Core/DSPCore/Src/DSPHWInterface.cpp b/Source/Core/DSPCore/Src/DSPHWInterface.cpp
index 315209ec20..13cf6edeb5 100644
--- a/Source/Core/DSPCore/Src/DSPHWInterface.cpp
+++ b/Source/Core/DSPCore/Src/DSPHWInterface.cpp
@@ -125,7 +125,7 @@ u16 gdsp_mbox_read_l(u8 mbx)
 }
 
 
-void gdsp_ifx_write(u16 addr, u16 val)
+void gdsp_ifx_write(u32 addr, u32 val)
 {
 	switch (addr & 0xff)
 	{
diff --git a/Source/Core/DSPCore/Src/DSPHWInterface.h b/Source/Core/DSPCore/Src/DSPHWInterface.h
index b848d467de..df83f61e4b 100644
--- a/Source/Core/DSPCore/Src/DSPHWInterface.h
+++ b/Source/Core/DSPCore/Src/DSPHWInterface.h
@@ -39,7 +39,7 @@ u16  gdsp_mbox_read_l(u8 mbx);
 
 void gdsp_ifx_init();
 
-void gdsp_ifx_write(u16 addr, u16 val);
+void gdsp_ifx_write(u32 addr, u32 val);
 u16  gdsp_ifx_read(u16 addr);
 
 void gdsp_idma_in(u16 dsp_addr, u32 addr, u32 size);
diff --git a/Source/Core/DSPCore/Src/Jit/DSPJitUtil.cpp b/Source/Core/DSPCore/Src/Jit/DSPJitUtil.cpp
index 97ff4f19ed..8afabf507e 100644
--- a/Source/Core/DSPCore/Src/Jit/DSPJitUtil.cpp
+++ b/Source/Core/DSPCore/Src/Jit/DSPJitUtil.cpp
@@ -256,15 +256,16 @@ void DSPEmitter::ext_dmem_write(u32 dest, u32 src)
 	MOVZX(32, 16, ECX, M(&g_dsp.r[src]));
 
 	//	u16 saddr = addr >> 12; 
-	MOVZX(32, 16, ESI, R(EAX));
+	MOV(32, R(ESI), R(EAX));
 	SHR(16, R(ESI), Imm8(12));
 
 	//	if (saddr == 0)
-	CMP(16, R(ESI), Imm16(0));
+	TEST(16, R(ESI), R(ESI));
 	FixupBranch ifx = J_CC(CC_NZ);
 
 	//  g_dsp.dram[addr & DSP_DRAM_MASK] = val;
 	AND(16, R(EAX), Imm16(DSP_DRAM_MASK));
+	SHL(16, R(EAX), Imm16(1));  // * sizeof(u16)
 #ifdef _M_X64
 	MOV(64, R(R11), Imm64((u64)g_dsp.dram)); 
 	ADD(64, R(EAX), R(R11));
@@ -287,14 +288,15 @@ void DSPEmitter::ext_dmem_read(u16 addr)
 	MOVZX(32, 16, ECX, M(&addr));
 
 	//	u16 saddr = addr >> 12; 
-	MOVZX(32, 16, ESI, R(ECX));
+	MOV(32, R(ESI), R(ECX));
 	SHR(16, R(ESI), Imm8(12));
 
 	//	if (saddr == 0)
-	CMP(16, R(ESI), Imm16(0));
+	TEST(16, R(ESI), R(ESI));
 	FixupBranch dram = J_CC(CC_NZ);
 	//	return g_dsp.dram[addr & DSP_DRAM_MASK];
 	AND(16, R(ECX), Imm16(DSP_DRAM_MASK));
+	SHL(16, R(ECX), Imm16(1)); // * sizeof(u16)
 #ifdef _M_X64
 	MOV(64, R(R11), Imm64((u64)g_dsp.dram)); 
 	ADD(64, R(ECX), R(R11));
diff --git a/Source/UnitTests/AudioJitTests.cpp b/Source/UnitTests/AudioJitTests.cpp
index d192bd82cd..cfabaeeb6c 100644
--- a/Source/UnitTests/AudioJitTests.cpp
+++ b/Source/UnitTests/AudioJitTests.cpp
@@ -77,6 +77,14 @@ void sbset()
 	tester.Report();
 }
 
+void nx_s() 
+{
+	DSPJitTester tester(0x8000, 0x0020);
+	tester.AddTestData(DSP_REG_AR0);
+	tester.AddTestData(DSP_REG_ACL0);
+	tester.TestAll(true);
+	tester.Report();
+}
 void AudioJitTests()
 {
 	DSPJitTester::Initialize();
@@ -91,6 +99,7 @@ void AudioJitTests()
 	nx_ir();
 	nx_dr();
 	nx_nr();
+	nx_s();
 }
 
 //required to be able to link against DSPCore