diff --git a/MiSTer.ini b/MiSTer.ini
index 4bd5eb0..608246e 100644
--- a/MiSTer.ini
+++ b/MiSTer.ini
@@ -3,6 +3,7 @@ key_menu_as_rgui=0     ; set to 1 to make the MENU key map to RGUI in Minimig (e
 forced_scandoubler=0   ; set to 1 to run scandoubler on VGA output always (depends on core).
 ;ypbpr=0               ; set to 1 for YPbPr on VGA output. (obsolete. see vga_mode)
 vga_mode=rgb           ; supported modes: rgb, ypbpr, svideo, cvbs. rgb is default.
+ntsc_mode=0            ; Only for S-Video and CVBS vga_mode. 0 - normal NTSC, 1 - PAL-60, 2 - PAL-M.
 composite_sync=0       ; set to 1 for composite sync on HSync signal of VGA output.
 vga_scaler=0           ; set to 1 to connect VGA to scaler output.
 hdmi_audio_96k=0       ; set to 1 for 96khz/16bit HDMI audio (48khz/16bit otherwise)
diff --git a/cfg.cpp b/cfg.cpp
index 19c1bb6..dc09c14 100644
--- a/cfg.cpp
+++ b/cfg.cpp
@@ -115,7 +115,8 @@ static const ini_var_t ini_vars[] =
 	{ "VIDEO_HUE", (void *)(&(cfg.video_hue)), UINT16, 0, 360},
 	{ "VIDEO_GAIN_OFFSET", (void *)(&(cfg.video_gain_offset)), STRING, 0, sizeof(cfg.video_gain_offset)},
 	{ "HDR", (void*)(&cfg.hdr), UINT8, 0, 2 },
-	{ "vga_mode", (void*)(&(cfg.vga_mode)), STRING, 0, sizeof(cfg.vga_mode) - 1 },
+	{ "VGA_MODE", (void*)(&(cfg.vga_mode)), STRING, 0, sizeof(cfg.vga_mode) - 1 },
+	{ "NTSC_MODE", (void *)(&(cfg.ntsc_mode)), UINT8, 0, 2},
 };
 
 static const int nvars = (int)(sizeof(ini_vars) / sizeof(ini_var_t));
diff --git a/cfg.h b/cfg.h
index 1805dfe..8a86c1f 100644
--- a/cfg.h
+++ b/cfg.h
@@ -88,6 +88,7 @@ typedef struct {
 	uint8_t hdr;
 	char vga_mode[16];
 	char vga_mode_int;
+	char ntsc_mode;
 } cfg_t;
 
 extern cfg_t cfg;
diff --git a/video.cpp b/video.cpp
index 36b3828..2be7d1f 100644
--- a/video.cpp
+++ b/video.cpp
@@ -2731,7 +2731,7 @@ static void set_yc_mode()
 	{
 		float fps = current_video_info.vtime ? (100000000.f / current_video_info.vtime) : 0.f;
 		int pal = fps < 55.f;
-		double CLK_REF = pal ? 4.43361875f : 3.579545f;
+		double CLK_REF = (pal || (cfg.ntsc_mode == 1)) ? 4.43361875f : (cfg.ntsc_mode == 2) ? 3.575611f : 3.579545f;
 		double CLK_VIDEO = current_video_info.ctime * 100.f / current_video_info.ptime;
 
 		int64_t PHASE_INC = ((int64_t)((CLK_REF / CLK_VIDEO) * 1099511627776LL)) & 0xFFFFFFFFFFLL;
@@ -2741,9 +2741,8 @@ static void set_yc_mode()
 		int COLORBURST_RANGE = (COLORBURST_START << 10) | COLORBURST_END;
 
 		char yc_key[64];
-		sprintf(yc_key, "%s_%.1f%s", user_io_get_core_name(1), fps, current_video_info.interlaced ? "i" : "");
-
-		printf("Calculated YC parameters for '%s': %s PHASE_INC=%lld, COLORBURST_START=%d, COLORBURST_END=%d\n", yc_key, pal ? "PAL" : "NTSC", PHASE_INC, COLORBURST_START, COLORBURST_END);
+		sprintf(yc_key, "%s_%.1f%s%s", user_io_get_core_name(1), fps, current_video_info.interlaced ? "i" : "", (pal || !cfg.ntsc_mode) ? "" : (cfg.ntsc_mode == 1) ? "s" : "m");
+		printf("Calculated YC parameters for '%s': %s PHASE_INC=%lld, COLORBURST_START=%d, COLORBURST_END=%d\n", yc_key, pal ? "PAL" : (cfg.ntsc_mode == 1) ? "PAL60" : (cfg.ntsc_mode == 2) ? "PAL-M" : "NTSC", PHASE_INC, COLORBURST_START, COLORBURST_END);
 
 		for (uint i = 0; i < sizeof(yc_modes) / sizeof(yc_modes[0]); i++)
 		{
@@ -2756,7 +2755,7 @@ static void set_yc_mode()
 		}
 
 		spi_uio_cmd_cont(UIO_SET_YC_PAR);
-		spi_w((pal ? 4 : 0) | ((cfg.vga_mode_int == 3) ? 3 : 1));
+		spi_w(((pal || cfg.ntsc_mode) ? 4 : 0) | ((cfg.vga_mode_int == 3) ? 3 : 1));
 		spi_w(PHASE_INC);
 		spi_w(PHASE_INC >> 16);
 		spi_w(PHASE_INC >> 32);