diff --git a/src/boards/unrom512.c b/src/boards/unrom512.c
index f82d7f9..9bc4736 100644
--- a/src/boards/unrom512.c
+++ b/src/boards/unrom512.c
@@ -210,6 +210,8 @@ static void UNROM512HSync(void) {
 }
 
 void UNROM512_Init(CartInfo *info) {
+	int mirror;
+
 	memset(fceumm_flash_buf, 0x00, fceumm_flash_buf_size);
 	flash_state = 0;
 	flash_bank = 0;
@@ -222,7 +224,21 @@ void UNROM512_Init(CartInfo *info) {
 	else
 		chrram_mask = 0x60;
 
-	SetupCartMirroring(info->mirror, (info->mirror >= MI_0) ? 0 : 1, 0);
+	mirror = (head.ROM_type & 1) | ((head.ROM_type & 8) >> 2);
+	switch (mirror) {
+	case 0: // hard horizontal, internal
+		SetupCartMirroring(MI_H, 1, NULL);
+		break;
+	case 1: // hard vertical, internal
+		SetupCartMirroring(MI_V, 1, NULL);
+		break;
+	case 2: // switchable 1-screen, internal (flags: 4-screen + horizontal)
+		SetupCartMirroring(MI_0, 0, NULL);
+		break;
+	case 3: // hard four screen, last 8k of 32k RAM (flags: 4-screen + vertical)
+		SetupCartMirroring(4, 1, VROM + (info->vram_size - 8192));
+		break;
+	}
 	bus_conflict = !info->battery;
 	latcheinit = 0;
 	WLSync = UNROM512LSync;
diff --git a/src/drivers/libretro/libretro.c b/src/drivers/libretro/libretro.c
index c8d4d1b..1a0e45a 100644
--- a/src/drivers/libretro/libretro.c
+++ b/src/drivers/libretro/libretro.c
@@ -218,10 +218,8 @@ FILE *FCEUD_UTF8fopen(const char *n, const char *m)
 
 /*palette for FCEU*/
 #define MAXPAL 17 /* raw palette # */
-static int use_ntsc = 0;
 static int external_palette_exist = 0;
 extern int ipalette;
-extern int ntsccol;
 
 struct st_palettes {
 	char name[32];
@@ -584,7 +582,6 @@ void retro_set_environment(retro_environment_t cb)
       { "fceumm_aspect", "Preferred aspect ratio; 8:7 PAR|4:3" },
       { "fceumm_palette", "Color Palette; default|asqrealc|nintendo-vc|rgb|yuv-v3|unsaturated-final|sony-cxa2025as-us|pal|bmf-final2|bmf-final3|smooth-fbx|composite-direct-fbx|pvm-style-d93-fbx|ntsc-hardware-fbx|nes-classic-fbx-fs|nescap|wavebeam|raw|custom" },
       { "fceumm_up_down_allowed", "Allow Opposing Directions; disabled|enabled" },
-      { "fceumm_use_ntsc", "Use NTSC Palette; disabled|enabled" },
 #ifdef PSP
       { "fceumm_overscan", "Crop Overscan; enabled|disabled" },
 #else
@@ -691,21 +688,18 @@ static void retro_set_custom_palette(void)
    uint8_t i,r,g,b;
 
    ipalette = 0;
-   ntsccol = 0;
    use_raw_palette = false;
 
-   if (current_palette == 0 || current_palette > MAXPAL
-   || (GameInfo->type == GIT_VSUNI))
+   if (!current_palette || current_palette > MAXPAL || (GameInfo->type == GIT_VSUNI))
    {
       if (current_palette > MAXPAL && GameInfo->type != GIT_VSUNI)
       {
          if (external_palette_exist)
+         {
             ipalette = 1;
+         }
       }
 
-      if (current_palette == 0)
-         ntsccol = use_ntsc;
-
       FCEU_ResetPalette(); /* Do palette reset. Priority will be:
                             * -ipalette   : sets external palette
                             * -ntsccol    : sets ntsc to default palette.
@@ -946,14 +940,6 @@ static void check_variables(bool startup)
    else
       up_down_allowed = false;
 
-   var.key = "fceumm_use_ntsc";
-
-   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
-   {
-      use_ntsc = (!strcmp(var.value, "enabled")) ? 1 : 0;
-      retro_set_custom_palette();
-   }
-
    var.key = "fceumm_nospritelimit";
 
    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
diff --git a/src/ines-correct.h b/src/ines-correct.h
index 24d75ad..359c7e9 100644
--- a/src/ines-correct.h
+++ b/src/ines-correct.h
@@ -277,6 +277,7 @@
 	{0x4f2f1846,	206,		1},	/* Famista '89 - Kaimaku Han!! (J) */
 	{0x22d6d5bd,	206,		1},	/* Jikuu Yuuden - Debias (J) */
 	{0x9d21fe96,	206,		1},	/* Lupin Sansei - Pandora no Isan (Japan) */
+	{0xae321339,	206,		1},	/* Pro Yakyuu - Family Stadium '88 (Japan) */
 	{0x96dfc776,	206,		1},	/* R.B.I. Baseball 2 (USA) (Unl) */
 	{0xfd63e7ac,	206,		1},	/* R.B.I. Baseball 3 (USA) (Unl) */
 	{0x2a01f9d1,	206,		1},	/* Wagyan Land (Japan) */
diff --git a/src/ines.h b/src/ines.h
index 2f94261..b3d07ba 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -22,9 +22,6 @@
 #ifndef _FCEU_INES_H
 #define _FCEU_INES_H
 
-extern uint32 ROM_size;
-extern uint32 VROM_size;
-
 typedef struct {
 	char ID[4];		/*NES^Z*/
 	uint8 ROM_size;
@@ -34,6 +31,12 @@ typedef struct {
 	uint8 reserve[8];
 } iNES_HEADER;
 
+extern uint8 *ROM;
+extern uint8 *VROM;
+extern uint32 ROM_size;
+extern uint32 VROM_size;
+extern iNES_HEADER head;
+
 void NSFVRC6_Init(void);
 void NSFMMC5_Init(void);
 void NSFAY_Init(void);
diff --git a/src/palette.c b/src/palette.c
index 169f4b1..adcef0c 100644
--- a/src/palette.c
+++ b/src/palette.c
@@ -34,7 +34,7 @@
 #define M_PI 3.14159265358979323846
 #endif
 
-int ntsccol = 0;
+static int ntsccol = 0;
 static int ntsctint = 46 + 10;
 static int ntschue = 72;
 
diff --git a/src/palette.h b/src/palette.h
index 9940568..3ca03b5 100644
--- a/src/palette.h
+++ b/src/palette.h
@@ -6,7 +6,6 @@ typedef struct {
 } pal;
 
 extern pal *palo;
-extern int ntsccol;
 extern int ipalette;
 void FCEU_ResetPalette(void);