diff --git a/MiSTer.ini b/MiSTer.ini
index 1be54d5..e83e484 100644
--- a/MiSTer.ini
+++ b/MiSTer.ini
@@ -109,6 +109,13 @@ video_info=0
 ; modes as a base even for 50Hz systems. 
 vsync_adjust=0
 
+; Subcarrier generator for composite video output on VGA_VS pin (AA24).
+; 0 - disabled (default, safe mode)
+; 1 - enabled (frequency determined by ntsc_mode setting)
+; Works with regular analog video only - not with direct video.
+; For external RGB to NTSC encoders: requires vga_mode=rgb, composite_sync=1, forced_scandoubler=0.
+subcarrier=0
+
 ; If your monitor doesn't support either very low (NTSC monitors may not support PAL) or 
 ; very high (PAL monitors may not support NTSC) then you can set refresh_min and/or refresh_max
 ; parameters, so vsync_adjust won't be applied for refreshes outside specified.
diff --git a/cfg.cpp b/cfg.cpp
index 6134a36..fe00eef 100644
--- a/cfg.cpp
+++ b/cfg.cpp
@@ -48,6 +48,7 @@ static const ini_var_t ini_vars[] =
 	{ "VIDEO_MODE_NTSC", (void*)(cfg.video_conf_ntsc), STRING, 0, sizeof(cfg.video_conf_ntsc) - 1 },
 	{ "VIDEO_INFO", (void*)(&(cfg.video_info)), UINT8, 0, 10 },
 	{ "VSYNC_ADJUST", (void*)(&(cfg.vsync_adjust)), UINT8, 0, 2 },
+	{ "SUBCARRIER", (void*)(&(cfg.subcarrier)), UINT8, 0, 1 },
 	{ "HDMI_AUDIO_96K", (void*)(&(cfg.hdmi_audio_96k)), UINT8, 0, 1 },
 	{ "DVI_MODE", (void*)(&(cfg.dvi_mode)), UINT8, 0, 1 },
 	{ "HDMI_LIMITED", (void*)(&(cfg.hdmi_limited)), UINT8, 0, 2 },
@@ -581,6 +582,7 @@ void cfg_parse()
 	cfg.rumble = 1;
 	cfg.wheel_force = 50;
 	cfg.dvi_mode = 2;
+	cfg.subcarrier = 0;
 	cfg.lookahead = 2;
 	cfg.hdr = 0;
 	cfg.hdr_max_nits = 1000;
diff --git a/cfg.h b/cfg.h
index 11906cf..8d330dc 100644
--- a/cfg.h
+++ b/cfg.h
@@ -25,6 +25,7 @@ typedef struct {
 	float refresh_max;
 	uint8_t controller_info;
 	uint8_t vsync_adjust;
+	uint8_t subcarrier;
 	uint8_t kbd_nomouse;
 	uint8_t mouse_throttle;
 	uint8_t bootscreen;
diff --git a/video.cpp b/video.cpp
index 07d063c..a10970b 100644
--- a/video.cpp
+++ b/video.cpp
@@ -2842,7 +2842,8 @@ bool video_mode_select(uint32_t vtime, vmode_custom_t* out_mode)
 
 static void set_yc_mode()
 {
-	if (cfg.vga_mode_int >= 2)
+	// Enable YC for S-Video/CVBS modes, or subcarrier for CXA2075 encoders
+	if (cfg.vga_mode_int >= 2 || (cfg.subcarrier && cfg.vga_mode_int == 0 && cfg.csync && !cfg.forced_scandoubler))
 	{
 		float fps = current_video_info.vtime ? (100000000.f / current_video_info.vtime) : 0.f;
 		int pal = fps < 55.f;
@@ -2875,12 +2876,28 @@ static void set_yc_mode()
 		}
 
 		spi_uio_cmd_cont(UIO_SET_YC_PAR);
-		spi_w(((pal || cfg.ntsc_mode) ? 4 : 0) | ((cfg.vga_mode_int == 3) ? 3 : 1));
+		// For traditional S-Video/CVBS modes, enable YC processing
+		// For subcarrier-only modes (RGB+subcarrier or direct video), keep yc_en=0
+		bool is_subcarrier_only = (cfg.subcarrier && (cfg.direct_video || (cfg.vga_mode_int == 0 && cfg.csync && !cfg.forced_scandoubler)));
+		uint16_t yc_config;
+		if (is_subcarrier_only) {
+			// Subcarrier-only: RGB mode with just PAL flag, yc_en=0
+			yc_config = ((pal || cfg.ntsc_mode) ? 4 : 0);
+		} else {
+			// Traditional YC modes: enable YC processing
+			yc_config = ((pal || cfg.ntsc_mode) ? 4 : 0) | ((cfg.vga_mode_int == 3) ? 3 : 1);
+		}
+		printf("Sending YC config to FPGA: 0x%02X (pal_en=%d, cvbs=%d, yc_en=%d)\n", yc_config, (yc_config >> 2) & 1, (yc_config >> 1) & 1, yc_config & 1);
+		spi_w(yc_config);
 		spi_w(PHASE_INC);
 		spi_w(PHASE_INC >> 16);
 		spi_w(PHASE_INC >> 32);
 		spi_w(COLORBURST_RANGE);
 		spi_w(COLORBURST_RANGE >> 16);
+		// Case 6: Send subcarrier enable flag
+		uint16_t subcarrier_enable = (cfg.subcarrier && cfg.vga_mode_int == 0 && cfg.csync && !cfg.forced_scandoubler) ? 1 : 0;
+		printf("Sending subcarrier enable to FPGA: %d\n", subcarrier_enable);
+		spi_w(subcarrier_enable);
 		DisableIO();
 	}
 	else