diff --git a/src/mame/drivers/deco32.c b/src/mame/drivers/deco32.c
index 3ab3fd09f17..da94a35d40a 100644
--- a/src/mame/drivers/deco32.c
+++ b/src/mame/drivers/deco32.c
@@ -362,7 +362,7 @@ READ32_MEMBER(deco32_state::deco32_71_r)
 READ32_MEMBER(deco32_state::captaven_soundcpu_r)
 {
 	/* Top byte - top bit low == sound cpu busy, bottom word is dips */
-	return 0xffff0000 | ioport("DSW")->read();
+	return 0xffff0000 | ioport("DSW2")->read();
 }
 
 READ32_MEMBER(deco32_state::fghthist_control_r)
@@ -696,8 +696,9 @@ static ADDRESS_MAP_START( captaven_map, AS_PROGRAM, 32, deco32_state )
 	AM_RANGE(0x110000, 0x111fff) AM_READWRITE(deco32_spriteram_r, deco32_spriteram_w)
 	AM_RANGE(0x120000, 0x127fff) AM_RAM AM_SHARE("ram") /* Main RAM */
 
-	AM_RANGE(0x128000, 0x128fff) AM_DEVREAD("ioprot", deco146_device,captaven_prot_r)
-	AM_RANGE(0x1280c8, 0x1280cb) AM_WRITE(deco32_sound_w)
+//	AM_RANGE(0x128000, 0x128fff) AM_DEVREAD("ioprot", deco146_device,captaven_prot_r)
+//	AM_RANGE(0x1280c8, 0x1280cb) AM_WRITE(deco32_sound_w)
+	AM_RANGE(0x128000, 0x12ffff) AM_READWRITE16(dg_protection_region_0_146_r, dg_protection_region_0_146_w, 0x0000ffff)
 
 	AM_RANGE(0x130000, 0x131fff) AM_RAM_WRITE(deco32_nonbuffered_palette_w) AM_SHARE("paletteram") /* Palette RAM */
 	AM_RANGE(0x148000, 0x14800f) AM_READWRITE(deco32_irq_controller_r, deco32_irq_controller_w)
@@ -848,7 +849,7 @@ static ADDRESS_MAP_START( dragngun_map, AS_PROGRAM, 32, dragngun_state )
 	AM_RANGE(0x000000, 0x0fffff) AM_ROM
 	AM_RANGE(0x100000, 0x11ffff) AM_RAM AM_SHARE("ram")
 //	AM_RANGE(0x120000, 0x120fff) AM_DEVREAD("ioprot", deco146_device, dragngun_prot_r)
-	AM_RANGE(0x120000, 0x127fff) AM_READWRITE16(dg_protection_region_0_146_r, dg_protection_region_0_146_w, 0x0000ffff) AM_MIRROR(0xff000000)
+	AM_RANGE(0x120000, 0x127fff) AM_READWRITE16(dg_protection_region_0_146_r, dg_protection_region_0_146_w, 0x0000ffff)
 
 //	AM_RANGE(0x1204c0, 0x1204c3) AM_WRITE(deco32_sound_w)
 	AM_RANGE(0x128000, 0x12800f) AM_READWRITE(deco32_irq_controller_r, deco32_irq_controller_w)
@@ -898,7 +899,7 @@ static ADDRESS_MAP_START( lockload_map, AS_PROGRAM, 32, dragngun_state )
 	AM_RANGE(0x100000, 0x11ffff) AM_RAM AM_SHARE("ram")
 //	AM_RANGE(0x120000, 0x120fff) AM_DEVREAD("ioprot", deco146_device, dragngun_prot_r)
 //	AM_RANGE(0x1204c0, 0x1204c3) AM_WRITE(deco32_sound_w)
-	AM_RANGE(0x120000, 0x127fff) AM_READWRITE16(dg_protection_region_0_146_r, dg_protection_region_0_146_w, 0x0000ffff) AM_MIRROR(0xff000000)
+	AM_RANGE(0x120000, 0x127fff) AM_READWRITE16(dg_protection_region_0_146_r, dg_protection_region_0_146_w, 0x0000ffff)
 
 	AM_RANGE(0x128000, 0x12800f) AM_READWRITE(deco32_irq_controller_r, deco32_irq_controller_w)
 
@@ -1117,7 +1118,7 @@ COIN1n adds 100 energy points (based on "Coinage") for player n when ingame if e
 */
 
 static INPUT_PORTS_START( captaven )
-	PORT_START("IN0")
+	PORT_START("INPUTS")
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
@@ -1135,7 +1136,7 @@ static INPUT_PORTS_START( captaven )
 	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNUSED )
 	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_START2 )
 
-	PORT_START("IN1")
+	PORT_START("DSW") // not dsw but the prot code expects dsw
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(3)
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(3)
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(3)
@@ -1153,25 +1154,14 @@ static INPUT_PORTS_START( captaven )
 	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNUSED )
 	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNUSED )
 
-	PORT_START("IN2")
+	PORT_START("SYSTEM")
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_COIN3 )
 	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_COIN4 )
-	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNUSED )
-	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNUSED )
 
-	PORT_START("DSW")   /* Dip switch bank 1 */
+
+	PORT_START("DSW2")   /* Dip switch bank 1 */
 	PORT_DIPNAME( 0x0007, 0x0007, DEF_STR( Coin_A ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( 3C_1C ) )
 	PORT_DIPSETTING(      0x0001, DEF_STR( 2C_1C ) )
@@ -1756,6 +1746,7 @@ static MACHINE_CONFIG_START( captaven, deco32_state )
 	decospr_device::set_pri_callback(*device, captaven_pri_callback);
 
 	MCFG_DECO146_ADD("ioprot")
+	MCFG_DECO146_SET_SOUNDLATCH_CALLBACK(deco32_state, deco32_sound_cb)
 
 	MCFG_VIDEO_START_OVERRIDE(deco32_state,captaven)
 
diff --git a/src/mame/drivers/lemmings.c b/src/mame/drivers/lemmings.c
index 2693dca9d5d..23f8e9972e2 100644
--- a/src/mame/drivers/lemmings.c
+++ b/src/mame/drivers/lemmings.c
@@ -70,6 +70,24 @@ WRITE8_MEMBER(lemmings_state::lemmings_sound_ack_w)
 	m_audiocpu->set_input_line(1, CLEAR_LINE);
 }
 
+READ16_MEMBER( lemmings_state::lem_protection_region_0_146_r )
+{
+	int real_address = 0 + (offset *2);
+	int deco146_addr = BITSWAP32(real_address, /* NC */31,30,29,28,27,26,25,24,23,22,21,20,19,18, 13,12,11,/**/      17,16,15,14,    10,9,8, 7,6,5,4, 3,2,1,0) & 0x7fff;
+	UINT8 cs = 0;
+	UINT16 data = m_deco146->read_data( deco146_addr, mem_mask, cs );
+	return data;
+}
+
+WRITE16_MEMBER( lemmings_state::lem_protection_region_0_146_w )
+{		
+	int real_address = 0 + (offset *2);
+	int deco146_addr = BITSWAP32(real_address, /* NC */31,30,29,28,27,26,25,24,23,22,21,20,19,18, 13,12,11,/**/      17,16,15,14,    10,9,8, 7,6,5,4, 3,2,1,0) & 0x7fff;
+	UINT8 cs = 0;
+	m_deco146->write_data( space, deco146_addr, data, mem_mask, cs );
+}
+
+
 /******************************************************************************/
 
 static ADDRESS_MAP_START( lemmings_map, AS_PROGRAM, 16, lemmings_state )
@@ -80,7 +98,8 @@ static ADDRESS_MAP_START( lemmings_map, AS_PROGRAM, 16, lemmings_state )
 	AM_RANGE(0x160000, 0x160fff) AM_RAM_WRITE(lemmings_palette_24bit_w) AM_SHARE("paletteram")
 	AM_RANGE(0x170000, 0x17000f) AM_RAM_WRITE(lemmings_control_w) AM_SHARE("control_data")
 	AM_RANGE(0x190000, 0x19000f) AM_READ(lemmings_trackball_r)
-	AM_RANGE(0x1a0000, 0x1a07ff) AM_DEVREAD("ioprot", deco146_device,lemmings_prot_r)
+//	AM_RANGE(0x1a0000, 0x1a07ff) AM_DEVREAD("ioprot", deco146_device,lemmings_prot_r)
+	AM_RANGE(0x1a0000, 0x1a3fff) AM_READWRITE(lem_protection_region_0_146_r,lem_protection_region_0_146_w)AM_SHARE("prot16ram") /* Protection device */
 	AM_RANGE(0x1a0064, 0x1a0065) AM_WRITE(lemmings_sound_w)
 	AM_RANGE(0x1c0000, 0x1c0001) AM_DEVWRITE("spriteram", buffered_spriteram16_device, write) /* 1 written once a frame */
 	AM_RANGE(0x1e0000, 0x1e0001) AM_DEVWRITE("spriteram2", buffered_spriteram16_device, write) /* 1 written once a frame */
@@ -103,7 +122,7 @@ ADDRESS_MAP_END
 /******************************************************************************/
 
 static INPUT_PORTS_START( lemmings )
-	PORT_START("BUTTONS")
+	PORT_START("INPUTS")
 	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_START1 )
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("P1 Select")
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("P1 Hurry")
@@ -126,11 +145,7 @@ static INPUT_PORTS_START( lemmings )
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN1 )
 	PORT_SERVICE_NO_TOGGLE(0x0004, IP_ACTIVE_LOW)
 	PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
-	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_UNKNOWN )
-	PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNKNOWN )
+
 
 	PORT_START("DSW")
 	PORT_DIPNAME( 0x0003, 0x0003, "Credits for 1 Player" )
@@ -261,6 +276,7 @@ static MACHINE_CONFIG_START( lemmings, lemmings_state )
 	decospr_device::set_gfx_region(*device, 0);
 
 	MCFG_DECO146_ADD("ioprot")
+	MCFG_DECO146_SET_USE_MAGIC_ADDRESS_XOR
 
 	/* sound hardware */
 	MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
diff --git a/src/mame/includes/lemmings.h b/src/mame/includes/lemmings.h
index 07c41327ef6..01b87b2ebe1 100644
--- a/src/mame/includes/lemmings.h
+++ b/src/mame/includes/lemmings.h
@@ -56,4 +56,7 @@ public:
 	void screen_eof_lemmings(screen_device &screen, bool state);
 	void lemmings_copy_bitmap(bitmap_rgb32& bitmap, bitmap_ind16& srcbitmap, int* xscroll, int* yscroll, const rectangle& cliprect);
 	required_device<cpu_device> m_maincpu;
+
+	DECLARE_READ16_MEMBER( lem_protection_region_0_146_r );
+	DECLARE_WRITE16_MEMBER( lem_protection_region_0_146_w );
 };
diff --git a/src/mame/machine/deco146.c b/src/mame/machine/deco146.c
index f572e3b63e5..726bcd129cb 100644
--- a/src/mame/machine/deco146.c
+++ b/src/mame/machine/deco146.c
@@ -1424,56 +1424,10 @@ void deco_146_base_device::device_reset()
 
 }
 
-/****************************************************************************************************
-*****************************************************************************************************
-*****************************************************************************************************
-*****************************************************************************************************
- Old style minimal handlers (where games only really use the I/O)
-
-  currently used by
-  
-  Lemmings
-  Captain America
-*****************************************************************************************************
-*****************************************************************************************************
-*****************************************************************************************************
-****************************************************************************************************/
 
 
 
 
-// alt read addresses (same as nitroball if you reverse lnes)
-/* Same as Robocop 2 protection chip */
-READ16_MEMBER(deco_146_base_device::lemmings_prot_r)
-{
-	switch (offset << 1)
-	{
-		case 0x41a:
-			return ioport(":BUTTONS")->read();
-
-		case 0x320:
-			return ioport(":SYSTEM")->read();
-
-		case 0x4e6:
-			return ioport(":DSW")->read();
-	}
-
-	return 0;
-}
-
-// standard read addresses
-READ32_MEMBER(deco_146_base_device::captaven_prot_r)
-{
-	/* Protection/IO chip 75, same as Lemmings & Robocop 2 */
-	switch (offset<<2) {
-	case 0x0a0: return ioport(":IN0")->read(); /* Player 1 & 2 controls */
-	case 0x158: return ioport(":IN1")->read(); /* Player 3 & 4 controls */
-	case 0xed4: return ioport(":IN2")->read(); /* Misc */
-	}
-
-	logerror("%08x: Unmapped protection read %04x\n",space.device().safe_pc(),offset<<2);
-	return 0xffffffff;
-}
 
 
 
diff --git a/src/mame/machine/deco146.h b/src/mame/machine/deco146.h
index 6af81c2b972..7f61d805c46 100644
--- a/src/mame/machine/deco146.h
+++ b/src/mame/machine/deco146.h
@@ -53,9 +53,7 @@ public:
 	static void set_interface_scramble(device_t &device,UINT8 a9, UINT8 a8, UINT8 a7, UINT8 a6, UINT8 a5, UINT8 a4, UINT8 a3,UINT8 a2,UINT8 a1,UINT8 a0);
 	static void set_use_magic_read_address_xor(device_t &device, int use_xor);
 
-	// legacy stuff
-	DECLARE_READ32_MEMBER(captaven_prot_r);
-	DECLARE_READ16_MEMBER(lemmings_prot_r);
+