diff --git a/src/mame/drivers/metlfrzr.cpp b/src/mame/drivers/metlfrzr.cpp
index bdebcab86d5..414a0970f76 100644
--- a/src/mame/drivers/metlfrzr.cpp
+++ b/src/mame/drivers/metlfrzr.cpp
@@ -9,7 +9,7 @@
 	HW seems the natural evolution of Dark Mist type HW.
 	
 	TODO:
-	- T5182 hookup, controls sound and coins;
+	- T5182 hookup, controls sound and coin inputs. With current hookup it accepts coins but not fully, and sound isn't working at all ...
 	- Sprites, 0xfe00-0xffff? (And why game doesn't actually write at 0xff80-0xffff?)
 	- Foreground rowscroll / per-tile scroll;
 	- Writes at 0xb800-0xbfff at attract mode gameplay demo transition?
@@ -88,6 +88,7 @@ WRITE8_MEMBER(metlfrzr_state::output_w)
 	m_fg_tilebank = (data & 0x10) >> 4;
 	membank("bank1")->set_entry((data & 0xc) >> 2);
 
+	popmessage("%02x",data & 3);
 	if(data & 0x63)
 		printf("%02x\n",data);
 }
@@ -99,13 +100,21 @@ static ADDRESS_MAP_START( metlfrzr_map, AS_PROGRAM, 8, metlfrzr_state )
 	AM_RANGE(0xd000, 0xd1ff) AM_RAM_DEVWRITE("palette", palette_device, write_indirect) AM_SHARE("palette")
 	AM_RANGE(0xd200, 0xd3ff) AM_RAM_DEVWRITE("palette", palette_device, write_indirect_ext) AM_SHARE("palette_ext")
 
+	AM_RANGE(0xd400, 0xd47f) AM_DEVREADWRITE("t5182", t5182_device, sharedram_r, sharedram_w)
+
 	AM_RANGE(0xd600, 0xd600) AM_READ_PORT("P1")
 	AM_RANGE(0xd601, 0xd601) AM_READ_PORT("P2")
 	AM_RANGE(0xd602, 0xd602) AM_READ_PORT("START")
 	AM_RANGE(0xd603, 0xd603) AM_READ_PORT("DSW1")
 	AM_RANGE(0xd604, 0xd604) AM_READ_PORT("DSW2")
+	// d600-0d61f scroll area?
 	
 	AM_RANGE(0xd700, 0xd700) AM_WRITE(output_w)
+	AM_RANGE(0xd710, 0xd710) AM_DEVWRITE("t5182", t5182_device, sound_irq_w)
+	AM_RANGE(0xd711, 0xd711) AM_DEVREAD("t5182", t5182_device, sharedram_semaphore_snd_r)
+	AM_RANGE(0xd712, 0xd712) AM_DEVWRITE("t5182", t5182_device, sharedram_semaphore_main_acquire_w)
+	AM_RANGE(0xd713, 0xd713) AM_DEVWRITE("t5182", t5182_device, sharedram_semaphore_main_release_w)
+	
 	AM_RANGE(0xd800, 0xdfff) AM_RAM
 	AM_RANGE(0xe000, 0xefff) AM_RAM
 	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE("wram")
@@ -120,22 +129,22 @@ ADDRESS_MAP_END
 
 static INPUT_PORTS_START( metlfrzr )
 	PORT_START("P1")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 )
-	PORT_BIT( 0xc0, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
+	PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_START("P2")
-	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
-	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_COCKTAIL
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_COCKTAIL
-	PORT_BIT( 0xc0, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL
+	PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_START("START")
 	PORT_DIPNAME( 0x01, 0x01, "2-0" )
@@ -167,21 +176,21 @@ static INPUT_PORTS_START( metlfrzr )
 	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Flip_Screen ) )
 	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x08, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x08, DEF_STR( On ) )
-	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x10, DEF_STR( On ) )
-	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
-	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
+	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
+	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
+	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
+	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
+	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
+	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
+	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
+	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
+	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
+	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
 	
 
 	PORT_START("DSW2")