diff --git a/src/boards/28.c b/src/boards/28.c
index 4fdd088..0daf2f3 100644
--- a/src/boards/28.c
+++ b/src/boards/28.c
@@ -56,8 +56,8 @@ void Mirror(uint8 value)
 
 
 static void Sync() {
-	uint8 prglo;
-	uint8 prghi;
+	uint8 prglo = 0;
+	uint8 prghi = 0;
 
 	uint8 outb = outer << 1;
 
diff --git a/src/boards/359.c b/src/boards/359.c
index 35a533d..535be26 100644
--- a/src/boards/359.c
+++ b/src/boards/359.c
@@ -24,7 +24,7 @@
 
 #include "mapinc.h"
 
-static uint8 mapperNum;
+static uint32 mapperNum;
 static uint8 preg[4];
 static uint8 creg[8];
 static uint8 exRegs[4];
diff --git a/src/boards/534.c b/src/boards/534.c
index 08e9096..3c5d247 100644
--- a/src/boards/534.c
+++ b/src/boards/534.c
@@ -30,10 +30,10 @@ static uint32 GetPRGBank(uint32 bank)
 }
 
 void SyncPRG_GNROM(int A14, int AND, int OR) {
-    setprg8(0x8000, (GetPRGBank(0) & ~A14) & AND | OR);
-    setprg8(0xA000, (GetPRGBank(1) & ~A14) & AND | OR);
-    setprg8(0xC000, (GetPRGBank(0) |  A14) & AND | OR);
-    setprg8(0xE000, (GetPRGBank(1) |  A14) & AND | OR);
+    setprg8(0x8000, ((GetPRGBank(0) & ~A14) & AND) | OR);
+    setprg8(0xA000, ((GetPRGBank(1) & ~A14) & AND) | OR);
+    setprg8(0xC000, ((GetPRGBank(0) |  A14) & AND) | OR);
+    setprg8(0xE000, ((GetPRGBank(1) |  A14) & AND) | OR);
 }
 
 static void M534PW(uint32 A, uint8 V) {
@@ -47,13 +47,6 @@ static void M534CW(uint32 A, uint8 V) {
     setchr1(A, (V & 0xFF) | ((EXPREGS[2] & 0x0F) << 3) | ((EXPREGS[0] & 0x18) << 4));
 }
 
-static DECLFR(M534Read) {
-    if (EXPREGS[1] & 0x01)
-        return (EXPREGS[4] | (X.DB & ~0x03));
-    else
-        return CartBR(A);
-}
-
 static DECLFW(M534IRQWrite) {
     MMC3_IRQWrite(0xC000 | (A & 1), V ^ 0xFF);
 }
diff --git a/src/boards/bmc60311c.c b/src/boards/bmc60311c.c
index 03eaf11..9ea71fa 100644
--- a/src/boards/bmc60311c.c
+++ b/src/boards/bmc60311c.c
@@ -52,6 +52,8 @@ static void Sync(void) {
 	 */
 
 	preg[0] = bank;
+	preg[1] = 0;
+
 	switch (mode & 3) {
 	case 0x00:
 	case 0x01:
diff --git a/src/boards/mmc1.c b/src/boards/mmc1.c
index c93fdb4..b9698c6 100644
--- a/src/boards/mmc1.c
+++ b/src/boards/mmc1.c
@@ -335,7 +335,8 @@ static void GenMMC1Init(CartInfo *info, int prg, int chr, int wram, int saveram)
 	is155 = 0;
 
 	info->Close = GenMMC1Close;
-	MMC1PRGHook16 = MMC1CHRHook4 = MMC1WRAMHook8 = 0;
+	MMC1PRGHook16 = MMC1CHRHook4 = 0;
+	MMC1WRAMHook8 = 0;
 	WRAMSIZE = wram * 1024;
 	NONSaveRAMSIZE = (wram - saveram) * 1024;
 	PRGmask16[0] &= (prg >> 14) - 1;
@@ -597,9 +598,9 @@ static void M543CHR4(uint32 A, uint8 V) {
 static void M543WRAM8(void) {
 	uint32 wramBank;
 	if (outerBank & 2)
-        wramBank = 4 | ((outerBank >> 1) & 2) | (outerBank & 1) ;
-    else
-        wramBank = ((outerBank << 1) & 2) | ((MMC1GetCHRBank(0) >> 3) & 1);
+		wramBank = 4 | ((outerBank >> 1) & 2) | (outerBank & 1) ;
+	else
+		wramBank = ((outerBank << 1) & 2) | ((MMC1GetCHRBank(0) >> 3) & 1);
 	setprg8r(0x10, 0x6000, wramBank);
 }
 
diff --git a/src/boards/txcchip.c b/src/boards/txcchip.c
index d2c0ab8..c494c21 100644
--- a/src/boards/txcchip.c
+++ b/src/boards/txcchip.c
@@ -98,7 +98,7 @@ static DECLFW(TXC_CMDWrite) {
 			if (txc.increase)
 				txc.accumulator++;
 			else
-				txc.accumulator = ((txc.accumulator & ~txc.mask) | (txc.staging ^ txc.invert) & txc.mask);
+				txc.accumulator = ((txc.accumulator & ~txc.mask) | ((txc.staging ^ txc.invert) & txc.mask));
 			break;
 		case 0x101:
 			txc.invert = (V & 0x01) ? 0xFF : 0x00;
@@ -133,9 +133,6 @@ static void GenTXCPower(void) {
 	TXCRegReset();
 }
 
-static void TXCClose(void) {
-}
-
 static void StateRestore(int version) {
 	WSync();
 }
@@ -148,7 +145,7 @@ static void GenTXC_Init(CartInfo *info, void (*proc)(void), uint32 jv001) {
 }
 
 static int CheckHash(CartInfo *info) {
-	int x, i = 0;
+	int x = 0;
 	uint64 partialmd5 = 0;
 
 	/* These carts do not work with new mapper implementation.
diff --git a/src/drivers/libretro/libretro.c b/src/drivers/libretro/libretro.c
index 7a77e88..85d0c99 100644
--- a/src/drivers/libretro/libretro.c
+++ b/src/drivers/libretro/libretro.c
@@ -81,7 +81,6 @@ static unsigned turbo_delay = 0;
 static unsigned input_type[MAX_PLAYERS + 1] = {0}; /* 4-players + famicom expansion */
 enum RetroZapperInputModes{RetroLightgun, RetroMouse, RetroPointer};
 static enum RetroZapperInputModes zappermode = RetroLightgun;
-static unsigned show_advance_sound_options;
 
 /* emulator-specific variables */
 
@@ -2215,7 +2214,7 @@ bool retro_load_game(const struct retro_game_info *game)
       FCEU_printf(" Loading custom palette: %s%cnes.pal\n", dir, slash);
 
    /* Save region and dendy mode for region-auto detect */
-   systemRegion = (dendy << 1) | retro_get_region() & 1;
+   systemRegion = (dendy << 1) | (retro_get_region() & 1);
 
    retro_set_custom_palette();
    FCEUD_SoundToggle();
diff --git a/src/fceu.c b/src/fceu.c
index b3cc164..de3f21b 100644
--- a/src/fceu.c
+++ b/src/fceu.c
@@ -396,7 +396,7 @@ void FCEU_MemoryRand(uint8 *ptr, uint32 size)
 		*ptr = (x & 1) ? 0x55 : 0xAA;	/* F-15 Sity War HISCORE is screwed... */
 										/* 1942 SCORE/HISCORE is screwed... */
 #endif
-		uint8_t v;
+		uint8_t v = 0;
 		switch (option_ramstate)
 		{
 		case 0: v = 0xff; break;
diff --git a/src/unif.c b/src/unif.c
index abb829a..18acb84 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -312,7 +312,7 @@ static int SetBoardName(FCEUFILE *fp) {
 	FCEU_fread(boardname, 1, uchead.info, fp);
 	boardname[uchead.info] = 0;
 	/* strip whitespaces */
-	boardname = string_trim_whitespace(boardname);
+	boardname = string_trim_whitespace((char const*)boardname);
 	FCEU_printf(" Board name: %s\n", boardname);
 	sboardname = boardname;
 	if (!memcmp(boardname, "NES-", 4) || !memcmp(boardname, "UNL-", 4) ||