diff --git a/Source/Core/DSPCore/Src/DSPIntExtOps.cpp b/Source/Core/DSPCore/Src/DSPIntExtOps.cpp
index 9e623fffdf..e707c4750d 100644
--- a/Source/Core/DSPCore/Src/DSPIntExtOps.cpp
+++ b/Source/Core/DSPCore/Src/DSPIntExtOps.cpp
@@ -121,7 +121,6 @@ void l(const UDSPInstruction& opc)
 	u8 sreg = opc.hex & 0x3;
 	u8 dreg = ((opc.hex >> 3) & 0x7) + DSP_REG_AXL0;
 	
-	// 40bit sign extension if target is acm.D (important for zelda type ucodes)
 	if ((dreg >= DSP_REG_ACM0) && (g_dsp.r[DSP_REG_SR] & SR_40_MODE_BIT)) 
 	{
 		u16 val = dsp_dmem_read(g_dsp.r[sreg]);
@@ -146,8 +145,19 @@ void ln(const UDSPInstruction& opc)
 	u8 sreg = opc.hex & 0x3;
 	u8 dreg = ((opc.hex >> 3) & 0x7) + DSP_REG_AXL0;
 
-	writeToBackLog(0, dreg,	dsp_dmem_read(g_dsp.r[sreg]));
-	writeToBackLog(1, sreg, dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]));
+	if ((dreg >= DSP_REG_ACM0) && (g_dsp.r[DSP_REG_SR] & SR_40_MODE_BIT)) 
+	{
+		u16 val = dsp_dmem_read(g_dsp.r[sreg]);
+		writeToBackLog(0, dreg - DSP_REG_ACM0 + DSP_REG_ACH0, (val & 0x8000) ? 0xFFFF : 0x0000);
+		writeToBackLog(1, dreg,	val);
+		writeToBackLog(2, dreg - DSP_REG_ACM0 + DSP_REG_ACL0, 0);
+		writeToBackLog(3, sreg, dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]));
+	}
+	else
+	{
+		writeToBackLog(0, dreg,	dsp_dmem_read(g_dsp.r[sreg]));
+		writeToBackLog(1, sreg, dsp_increase_addr_reg(sreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]));
+	}
 }
 
 // LS $axD.l, $acS.m
diff --git a/Source/Core/DSPCore/Src/DspIntArithmetic.cpp b/Source/Core/DSPCore/Src/DspIntArithmetic.cpp
index aa7b95b5d6..0e51e45a2e 100644
--- a/Source/Core/DSPCore/Src/DspIntArithmetic.cpp
+++ b/Source/Core/DSPCore/Src/DspIntArithmetic.cpp
@@ -58,15 +58,15 @@ void addaxl(const UDSPInstruction& opc)
 	u8 sreg = (opc.hex >> 9) & 0x1;
 	u8 dreg = (opc.hex >> 8) & 0x1;
 
-	s64 acc = dsp_get_long_acc(dreg);
-	s64 acx = dsp_get_ax_l(sreg);
+	u64 acc = (u64)dsp_get_long_acc(dreg);
+	u16 acx = (u16)dsp_get_ax_l(sreg);
 
 	acc += acx;
 
 	zeroWriteBackLog();
 
-	dsp_set_long_acc(dreg, acc);
-	Update_SR_Register64(acc);
+	dsp_set_long_acc(dreg, (s64)acc);
+	Update_SR_Register64((s64)acc);
 }
 
 // TSTAXH $axR.h
diff --git a/Source/Core/DSPCore/Src/DspIntMultiplier.cpp b/Source/Core/DSPCore/Src/DspIntMultiplier.cpp
index 1a33280865..a671b6e710 100644
--- a/Source/Core/DSPCore/Src/DspIntMultiplier.cpp
+++ b/Source/Core/DSPCore/Src/DspIntMultiplier.cpp
@@ -184,8 +184,8 @@ void tstprod(const UDSPInstruction& opc)
 // secondary accumulator $axS (treat them both as signed).
 void mulc(const UDSPInstruction& opc)
 {
-	u8 sreg = (opc.hex >> 11) & 0x1;
-	u8 treg = (opc.hex >> 12) & 0x1;
+	u8 sreg = (opc.hex >> 12) & 0x1;
+	u8 treg = (opc.hex >> 11) & 0x1;
 	u16 accm = dsp_get_acc_m(sreg);
 	u16 axh = dsp_get_ax_h(treg);
 	s64 prod = dsp_multiply(accm, axh);