diff --git a/src/cdrom/cdrom.c b/src/cdrom/cdrom.c
index 30ebcf662..223e1411c 100644
--- a/src/cdrom/cdrom.c
+++ b/src/cdrom/cdrom.c
@@ -12,7 +12,7 @@
  *
  * Author:	Miran Grca, <mgrca8@gmail.com>
  *
- *		Copyright 2018,2019 Miran Grca.
+ *		Copyright 2018-2021 Miran Grca.
  */
 #include <inttypes.h>
 #include <stdarg.h>
diff --git a/src/codegen_new/codegen_allocator.c b/src/codegen_new/codegen_allocator.c
index f441c2c4b..ad07afd73 100644
--- a/src/codegen_new/codegen_allocator.c
+++ b/src/codegen_new/codegen_allocator.c
@@ -120,7 +120,11 @@ void codegen_allocator_clean_blocks(struct mem_block_t *block)
 #if defined __ARM_EABI__ || defined _ARM_ || defined __aarch64__ || defined _M_ARM || defined _M_ARM64
         while (1)
         {
+#ifndef _MSC_VER
 		__clear_cache(&mem_block_alloc[block->offset], &mem_block_alloc[block->offset + MEM_BLOCK_SIZE]);
+#else
+		FlushInstructionCache(GetCurrentProcess(), &mem_block_alloc[block->offset], MEM_BLOCK_SIZE);
+#endif
 		if (block->next)
 			block = &mem_blocks[block->next - 1];
 		else
diff --git a/src/codegen_new/codegen_ops_helpers.c b/src/codegen_new/codegen_ops_helpers.c
index 6a3e8f6d8..6d8cbfd3a 100644
--- a/src/codegen_new/codegen_ops_helpers.c
+++ b/src/codegen_new/codegen_ops_helpers.c
@@ -62,7 +62,7 @@ int codegen_can_unroll_full(codeblock_t *block, ir_data_t *ir, uint32_t next_pc,
                 return 0;
 
         max_unroll = UNROLL_MAX_UOPS / ((ir->wr_pos-start)+6);
-        if (max_unroll > (UNROLL_MAX_REG_REFERENCES / max_version_refcount))
+        if ((max_version_refcount != 0) && (max_unroll > (UNROLL_MAX_REG_REFERENCES / max_version_refcount)))
                 max_unroll = (UNROLL_MAX_REG_REFERENCES / max_version_refcount);
         if (max_unroll > UNROLL_MAX_COUNT)
                 max_unroll = UNROLL_MAX_COUNT;
diff --git a/src/include/86box/filters.h b/src/include/86box/filters.h
index ff11a05d4..98eff66e2 100644
--- a/src/include/86box/filters.h
+++ b/src/include/86box/filters.h
@@ -299,6 +299,37 @@ static inline double high_cut_iir(int c, int i, double NewSample) {
     return y[c][i][0];
 }
 
+/* fc=5.283kHz, gain=-9.477dB, width=0.4845 */
+static inline double deemph_iir(int i, double NewSample) {
+    double ACoef[NCoef+1] = {
+        0.46035077886318842566,
+        -0.28440821191249848754,
+        0.03388877229118691936
+    };
+
+    double BCoef[NCoef+1] = {
+        1.00000000000000000000,
+        -1.05429146278569141337,
+        0.26412280202756849290
+    };
+    static double y[2][NCoef+1]; /* output samples */
+    static double x[2][NCoef+1]; /* input samples */
+    int n;
+
+    /* shift the old samples */
+    for(n=NCoef; n>0; n--) {
+       x[i][n] = x[i][n-1];
+       y[i][n] = y[i][n-1];
+    }
+
+    /* Calculate the new output */
+    x[i][0] = NewSample;
+    y[i][0] = ACoef[0] * x[i][0];
+    for(n=1; n<=NCoef; n++)
+        y[i][0] += ACoef[n] * x[i][n] - BCoef[n] * y[i][n];
+
+    return y[i][0];
+}
 
 #undef NCoef
 #define NCoef 2
diff --git a/src/sound/snd_audiopci.c b/src/sound/snd_audiopci.c
index 886ab4ff2..e34324657 100644
--- a/src/sound/snd_audiopci.c
+++ b/src/sound/snd_audiopci.c
@@ -16,7 +16,6 @@
 #include <86box/timer.h>
 #include <86box/sound.h>
 #include <86box/midi.h>
-#include <86box/snd_mpu401.h>
 #include <86box/snd_ac97.h>
 
 
@@ -27,8 +26,6 @@
 static float low_fir_es1371_coef[ES1371_NCoef];
 
 typedef struct {
-    mpu_t mpu;
-
     uint8_t pci_command, pci_serr;
 
     uint32_t base_addr;
@@ -897,7 +894,7 @@ static uint8_t es1371_pci_read(int func, int addr, void *p)
 		case 0x04: return es1371->pci_command;
 		case 0x05: return es1371->pci_serr;
 		
-		case 0x06: return 0x10;	/* Supports support ACPI */
+		case 0x06: return 0x10;	/* Supports ACPI */
 		case 0x07: return 0x00;
 
 		case 0x08: return 0x02;	/* Revision ID */