diff --git a/cfg.cpp b/cfg.cpp
index 55a24f3..8e29c50 100644
--- a/cfg.cpp
+++ b/cfg.cpp
@@ -29,6 +29,7 @@ const ini_var_t ini_vars[] = {
 	{ "COMPOSITE_SYNC", (void*)(&(cfg.csync)), UINT8, 0, 1, 1 },
 	{ "FORCED_SCANDOUBLER", (void*)(&(cfg.forced_scandoubler)), UINT8, 0, 1, 1 },
 	{ "VGA_SCALER", (void*)(&(cfg.vga_scaler)), UINT8, 0, 1, 1 },
+	{ "VGA_SOG", (void*)(&(cfg.vga_sog)), UINT8, 0, 1, 1 },
 	{ "KEYRAH_MODE", (void*)(&(cfg.keyrah_mode)), UINT32, 0, (int)0xFFFFFFFF, 1 },
 	{ "RESET_COMBO", (void*)(&(cfg.reset_combo)), UINT8, 0, 3, 1 },
 	{ "KEY_MENU_AS_RGUI", (void*)(&(cfg.key_menu_as_rgui)), UINT8, 0, 1, 1 },
diff --git a/cfg.h b/cfg.h
index a10408c..679fafd 100644
--- a/cfg.h
+++ b/cfg.h
@@ -20,6 +20,7 @@ typedef struct {
 	uint8_t ypbpr;
 	uint8_t csync;
 	uint8_t vga_scaler;
+	uint8_t vga_sog;
 	uint8_t hdmi_audio_96k;
 	uint8_t dvi;
 	uint8_t hdmi_limited;
diff --git a/user_io.cpp b/user_io.cpp
index b54bf21..bdeab9e 100644
--- a/user_io.cpp
+++ b/user_io.cpp
@@ -1538,6 +1538,7 @@ void user_io_send_buttons(char force)
 	if (kbd_reset) map |= BUTTON2;
 
 	if (cfg.vga_scaler) map |= CONF_VGA_SCALER;
+	if (cfg.vga_sog) map |= CONF_VGA_SOG;
 	if (cfg.csync) map |= CONF_CSYNC;
 	if (cfg.ypbpr) map |= CONF_YPBPR;
 	if (cfg.forced_scandoubler) map |= CONF_FORCED_SCANDOUBLER;
diff --git a/user_io.h b/user_io.h
index a9b10f5..3c863c4 100644
--- a/user_io.h
+++ b/user_io.h
@@ -119,15 +119,16 @@
 #define KBD_LED_FLAG_MASK     0xC0
 #define KBD_LED_FLAG_STATUS   0x40
 
-#define BUTTON1                 0b000000001
-#define BUTTON2                 0b000000010
-#define CONF_VGA_SCALER         0b000000100
-#define CONF_CSYNC              0b000001000
-#define CONF_FORCED_SCANDOUBLER 0b000010000
-#define CONF_YPBPR              0b000100000
-#define CONF_AUDIO_96K          0b001000000
-#define CONF_DVI                0b010000000
-#define CONF_HDMI_LIMITED       0b100000000
+#define BUTTON1                 0b0000000001
+#define BUTTON2                 0b0000000010
+#define CONF_VGA_SCALER         0b0000000100
+#define CONF_CSYNC              0b0000001000
+#define CONF_FORCED_SCANDOUBLER 0b0000010000
+#define CONF_YPBPR              0b0000100000
+#define CONF_AUDIO_96K          0b0001000000
+#define CONF_DVI                0b0010000000
+#define CONF_HDMI_LIMITED       0b0100000000
+#define CONF_VGA_SOG            0b1000000000
 
 // core type value should be unlikely to be returned by broken cores
 #define CORE_TYPE_UNKNOWN   0x55