diff --git a/src/boards/235.c b/src/boards/235.c
index b0a151c..c26d451 100644
--- a/src/boards/235.c
+++ b/src/boards/235.c
@@ -21,9 +21,6 @@
 
 #include "mapinc.h"
 
-static uint8 *CHRRAM;
-static uint32 CHRRAMSIZE;
-
 static uint16 cmdreg;
 static uint8 unrom, reg, openbus;
 
diff --git a/src/boards/364.c b/src/boards/364.c
index 5fc4c2c..b5f4a5d 100644
--- a/src/boards/364.c
+++ b/src/boards/364.c
@@ -44,11 +44,6 @@ static void M364Power(void) {
 	SetWriteHandler(0x7000, 0x7FFF, M364Write);
 }
 
-static void M364Reset(void) {
-	EXPREGS[0] = 0;
-	MMC3RegReset();
-}
-
 void Mapper364_Init(CartInfo *info) {
 	GenMMC3_Init(info, 512, 512, 8, 0);
 	pwrap = M364PW;
diff --git a/src/boards/375.c b/src/boards/375.c
index 2b78638..5004fb2 100644
--- a/src/boards/375.c
+++ b/src/boards/375.c
@@ -73,10 +73,6 @@ static void Sync(void) {
 	setprg8r(0x10, 0x6000, 0);
 }
 
-static DECLFR(M375Read) {
-	return CartBR(A);
-}
-
 static DECLFW(M375Write) {
 	if (addrlatch & 0x800)
 		datalatch = V;
diff --git a/src/boards/hp898f.c b/src/boards/hp898f.c
index 43ba53d..5ce27df 100644
--- a/src/boards/hp898f.c
+++ b/src/boards/hp898f.c
@@ -48,13 +48,6 @@ static DECLFW(HP898FWrite) {
 	}
 }
 
-static DECLFW(HP898FWriteEx) {
-	switch (A & 4) {
-	case 0:	regs[0] = V; break; /* CHR */
-	case 4:	regs[1] = (V & 0xC0) | ((V >> 2) & 6) | ((V & 0x20) ? 1 : 0); break; /* PRG */
-	}
-	Sync();
-}
 static void HP898FPower(void) {
 	regs[0] = regs[1] = 0;
 	Sync();
diff --git a/src/boards/jyasic.c b/src/boards/jyasic.c
index 7ffb0a1..89fd170 100644
--- a/src/boards/jyasic.c
+++ b/src/boards/jyasic.c
@@ -689,8 +689,6 @@ void Mapper421_Init(CartInfo *info)
 static uint8 HSK007Reg[4];
 void sync394 (void) /* Called when J.Y. ASIC is active */
 {
-	int prgAND =HSK007Reg[3] &0x10? 0x1F: 0x0F;
-	int chrAND =HSK007Reg[3] &0x80? 0xFF: 0x7F;
 	int prgOR  =HSK007Reg[3] <<1 &0x010 | HSK007Reg[1] <<5 &0x020;
 	int chrOR  =HSK007Reg[3] <<1 &0x080 | HSK007Reg[1] <<8 &0x100;
 	syncPRG(0x1F, prgOR);
diff --git a/src/drivers/libretro/libretro.c b/src/drivers/libretro/libretro.c
index ab3ad9b..cdec31d 100644
--- a/src/drivers/libretro/libretro.c
+++ b/src/drivers/libretro/libretro.c
@@ -1321,7 +1321,6 @@ static bool update_option_visibility(void)
 {
    struct retro_variable var = {0};
    bool updated              = false;
-   size_t i, size;
 
    /* If frontend supports core option categories,
     * then fceumm_show_adv_system_options and
@@ -1415,7 +1414,7 @@ static bool update_option_visibility(void)
 static void set_variables(void)
 {
    struct retro_core_option_display option_display;
-   unsigned i = 0, index = 0;
+   unsigned index = 0;
 
    option_display.visible = false;
 
@@ -2696,8 +2695,8 @@ static void retro_run_blit(uint8_t *gfx)
 void retro_run(void)
 {
    uint8_t *gfx;
-   int32_t i, ssize = 0;
-   bool updated = false;
+   int32_t ssize = 0;
+   bool updated  = false;
 
    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
       check_variables(false);
diff --git a/src/sound.c b/src/sound.c
index d31a9f7..dbf1c8a 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -691,9 +691,7 @@ static void RDoSQLQ(void) {
 
 static void RDoTriangle(void) {
 	int32 V;
-	int32 tcout, cout;
-
-	tcout = (tristep & 0xF);
+	int32 tcout = (tristep & 0xF);
 	if (!(tristep & 0x10)) tcout ^= 0xF;
 	tcout = (tcout * 3) << 16;	/* (tcout<<1); */