diff --git a/src/emu/video/m50458.c b/src/emu/video/m50458.c
index 6568ef2d82c..603976b079c 100644
--- a/src/emu/video/m50458.c
+++ b/src/emu/video/m50458.c
@@ -32,6 +32,8 @@ static ADDRESS_MAP_START( m50458_vram, AS_0, 16, m50458_device )
 	AM_RANGE(0x0242, 0x0243) AM_WRITE(vreg_121_w)
 	AM_RANGE(0x0244, 0x0245) AM_WRITE(vreg_122_w)
 	AM_RANGE(0x0246, 0x0247) AM_WRITE(vreg_123_w)
+	AM_RANGE(0x0248, 0x0249) AM_WRITE(vreg_124_w)
+	AM_RANGE(0x024a, 0x024b) AM_WRITE(vreg_125_w)
 	AM_RANGE(0x024c, 0x024d) AM_WRITE(vreg_126_w)
 	AM_RANGE(0x024e, 0x024f) AM_WRITE(vreg_127_w)
 ADDRESS_MAP_END
@@ -86,6 +88,17 @@ WRITE16_MEMBER( m50458_device::vreg_123_w)
 //	printf("%02x %02x %02x\n",m_scrr,m_scrf,m_space);
 }
 
+WRITE16_MEMBER( m50458_device::vreg_124_w)
+{
+
+}
+
+WRITE16_MEMBER( m50458_device::vreg_125_w)
+{
+	/* blinking cycle */
+	m_blink = data & 4 ? 0x20 : 0x40;
+}
+
 WRITE16_MEMBER( m50458_device::vreg_126_w)
 {
 	/* Raster Color Setting */
@@ -175,6 +188,20 @@ void m50458_device::device_validity_check(validity_checker &valid) const
 }
 
 
+void m50458_device::device_config_complete()
+{
+	// inherit a copy of the static data
+	const m50458_interface *intf = reinterpret_cast<const m50458_interface *>(static_config());
+	if (intf != NULL)
+		*static_cast<m50458_interface *>(this) = *intf;
+
+	// or initialize to defaults if none provided
+	else
+	{
+		// ...
+	}
+}
+
 //-------------------------------------------------
 //  device_start - device-specific startup
 //-------------------------------------------------
@@ -222,6 +249,14 @@ void m50458_device::device_start()
 			m_shadow_gfx[dst] |= (tmp >> 8);
 		}
 	}
+
+	// find screen
+	m_screen = machine().device<screen_device>(m_screen_tag);
+
+	if (m_screen == NULL)
+	{
+		m_screen = owner()->subdevice<screen_device>(m_screen_tag);
+	}
 }
 
 
@@ -236,6 +271,8 @@ void m50458_device::device_reset()
 	/* clear VRAM at boot */
 	for(i=0;i<0x120;i++)
 		write_word(i,0x007f);
+
+	m_blink = 0x40;
 }
 
 
@@ -338,8 +375,6 @@ UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
 					int res_y,res_x;
 					UINT8 xh,yh;
 
-					/* TODO: blinking, bit 7 (RTC test in NSS) */
-
 					if(xi>=8)
 						pix = ((pcg[offset+1] >> (7-(xi & 0x7))) & 1) << 1;
 					else
@@ -350,6 +385,10 @@ UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
 					else
 						pix |= ((m_shadow_gfx[offset+0] >> (7-(xi & 0x7))) & 1);
 
+					/* blinking, VERY preliminary */
+					if(tile & 0x800 && m_screen->frame_number() & m_blink)
+						pix = 0;
+
 					if(yi == 17 && tile & 0x1000) /* underline? */
 						pix |= 1;
 
diff --git a/src/emu/video/m50458.h b/src/emu/video/m50458.h
index d646bfb0b84..192b5cd2753 100644
--- a/src/emu/video/m50458.h
+++ b/src/emu/video/m50458.h
@@ -15,8 +15,13 @@ Mitsubishi M50458 OSD chip
 //  INTERFACE CONFIGURATION MACROS
 //**************************************************************************
 
-#define MCFG_M50458_ADD(_tag,_freq) \
+#define MCFG_M50458_ADD(_tag,_config,_freq) \
 	MCFG_DEVICE_ADD(_tag, M50458,_freq) \
+	MCFG_DEVICE_CONFIG(_config) \
+
+
+#define M50458_INTERFACE(name) \
+	const m50458_interface (name) =
 
 
 //**************************************************************************
@@ -29,10 +34,18 @@ typedef enum
 	OSD_SET_DATA
 } m50458_state_t;
 
+// ======================> upd7220_interface
+
+struct m50458_interface
+{
+	const char *m_screen_tag;
+};
+
 // ======================> m50458_device
 
 class m50458_device :	public device_t,
-						public device_memory_interface
+						public device_memory_interface,
+						public m50458_interface
 {
 public:
 	// construction/destruction
@@ -46,6 +59,8 @@ public:
 	DECLARE_WRITE16_MEMBER(vreg_121_w);
 	DECLARE_WRITE16_MEMBER(vreg_122_w);
 	DECLARE_WRITE16_MEMBER(vreg_123_w);
+	DECLARE_WRITE16_MEMBER(vreg_124_w);
+	DECLARE_WRITE16_MEMBER(vreg_125_w);
 	DECLARE_WRITE16_MEMBER(vreg_126_w);
 	DECLARE_WRITE16_MEMBER(vreg_127_w);
 
@@ -58,6 +73,9 @@ protected:
 	virtual void device_start();
 	virtual void device_reset();
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
+	virtual void device_config_complete();
+
+	screen_device *m_screen;
 
 	int m_latch;
 	int	m_reset_line;
@@ -73,6 +91,7 @@ protected:
 	UINT8 m_space;
 	UINT8 m_hsz1,m_hsz2,m_hsz3;
 	UINT8 m_vsz1,m_vsz2,m_vsz3;
+	UINT8 m_blink;
 
 	m50458_state_t m_osd_state;
 
diff --git a/src/mame/drivers/nss.c b/src/mame/drivers/nss.c
index 746c947ce40..0a885170937 100644
--- a/src/mame/drivers/nss.c
+++ b/src/mame/drivers/nss.c
@@ -844,6 +844,11 @@ static MACHINE_RESET( nss )
 	state->m_joy_flag = 1;
 }
 
+static M50458_INTERFACE( m50458_intf )
+{
+	"osd"
+};
+
 static MACHINE_CONFIG_DERIVED( nss, snes )
 
 	MCFG_CPU_ADD("bios", Z80, 4000000)
@@ -851,7 +856,7 @@ static MACHINE_CONFIG_DERIVED( nss, snes )
 	MCFG_CPU_IO_MAP(bios_io_map)
 	MCFG_CPU_VBLANK_INT("screen", nss_vblank_irq)
 
-	MCFG_M50458_ADD("m50458",4000000) /* TODO: clock */
+	MCFG_M50458_ADD("m50458",m50458_intf,4000000) /* TODO: clock */
 	MCFG_S3520CF_ADD("s3520cf") /* RTC */
 	MCFG_RP5H01_ADD("rp5h01")
 	MCFG_M6M80011AP_ADD("m6m80011ap")