diff --git a/src/mame/drivers/cave.c b/src/mame/drivers/cave.c
index 57c564cac3a..b9aedd2d053 100644
--- a/src/mame/drivers/cave.c
+++ b/src/mame/drivers/cave.c
@@ -86,7 +86,6 @@ Versions known to exist but not dumped:
 #include "cpu/m68000/m68000.h"
 #include "machine/eeprom.h"
 #include "machine/nvram.h"
-#include "machine/nmk112.h"
 #include "cpu/z80/z80.h"
 #include "includes/cave.h"
 #include "sound/2203intf.h"
@@ -510,7 +509,7 @@ static ADDRESS_MAP_START( donpachi_map, AS_PROGRAM, 16, cave_state )
 /**/AM_RANGE(0xa08000, 0xa08fff) AM_RAM AM_SHARE("paletteram")      // Palette
 	AM_RANGE(0xb00000, 0xb00003) AM_DEVREADWRITE8("oki1", okim6295_device, read, write, 0x00ff)                 // M6295
 	AM_RANGE(0xb00010, 0xb00013) AM_DEVREADWRITE8("oki2", okim6295_device, read, write, 0x00ff)                 //
-	AM_RANGE(0xb00020, 0xb0002f) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_lsb_w)                             //
+	AM_RANGE(0xb00020, 0xb0002f) AM_DEVWRITE("nmk112", nmk112_device, okibank_lsb_w)                             //
 	AM_RANGE(0xc00000, 0xc00001) AM_READ_PORT("IN0")                                                        // Inputs
 	AM_RANGE(0xc00002, 0xc00003) AM_READ_PORT("IN1")                                                        // Inputs + EEPROM
 	AM_RANGE(0xd00000, 0xd00001) AM_WRITE(cave_eeprom_msb_w)                                    // EEPROM
@@ -1164,7 +1163,7 @@ static ADDRESS_MAP_START( pwrinst2_sound_portmap, AS_IO, 8, cave_state )
 	ADDRESS_MAP_GLOBAL_MASK(0xff)
 	AM_RANGE(0x00, 0x00) AM_DEVREADWRITE("oki1", okim6295_device, read, write)  // M6295
 	AM_RANGE(0x08, 0x08) AM_DEVREADWRITE("oki2", okim6295_device, read, write)  //
-	AM_RANGE(0x10, 0x17) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_w)         // Samples bank
+	AM_RANGE(0x10, 0x17) AM_DEVWRITE("nmk112", nmk112_device, okibank_w)         // Samples bank
 	AM_RANGE(0x40, 0x41) AM_DEVREADWRITE("ymsnd", ym2203_device, read, write)   //
 	AM_RANGE(0x50, 0x50) AM_WRITE(soundlatch_ack_w)                         // To Main CPU
 //  AM_RANGE(0x51, 0x51) AM_WRITENOP                                         // ?? volume
diff --git a/src/mame/drivers/nmk16.c b/src/mame/drivers/nmk16.c
index 08daa9d7bb4..6f2fee26080 100644
--- a/src/mame/drivers/nmk16.c
+++ b/src/mame/drivers/nmk16.c
@@ -148,7 +148,6 @@ Afega stands for "Art-Fiction Electronic Game"
 #include "sound/okim6295.h"
 #include "sound/3812intf.h"
 #include "machine/nmk004.h"
-#include "machine/nmk112.h"
 #include "cpu/pic16c5x/pic16c5x.h"
 #include "includes/nmk16.h"
 
@@ -1080,7 +1079,7 @@ static ADDRESS_MAP_START( raphero_sound_mem_map, AS_PROGRAM, 8, nmk16_state )
 	AM_RANGE(0xc000, 0xc001) AM_DEVREADWRITE("ymsnd", ym2203_device, read, write)
 	AM_RANGE(0xc800, 0xc800) AM_DEVREADWRITE("oki1", okim6295_device, read, write)
 	AM_RANGE(0xc808, 0xc808) AM_DEVREADWRITE("oki2", okim6295_device, read, write)
-	AM_RANGE(0xc810, 0xc817) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_w)
+	AM_RANGE(0xc810, 0xc817) AM_DEVWRITE("nmk112", nmk112_device, okibank_w)
 //  AM_RANGE(0xc810, 0xc817) AM_WRITE(okibank_w)
 	AM_RANGE(0xd000, 0xd000) AM_WRITE(raphero_sound_rombank_w)
 	AM_RANGE(0xd800, 0xd800) AM_READWRITE(soundlatch_byte_r, soundlatch2_byte_w)    // main cpu
@@ -1101,7 +1100,7 @@ static ADDRESS_MAP_START( macross2_sound_io_map, AS_IO, 8, nmk16_state )
 	AM_RANGE(0x00, 0x01) AM_DEVREADWRITE("ymsnd", ym2203_device, read, write)
 	AM_RANGE(0x80, 0x80) AM_DEVREADWRITE("oki1", okim6295_device, read, write)
 	AM_RANGE(0x88, 0x88) AM_DEVREADWRITE("oki2", okim6295_device, read, write)
-	AM_RANGE(0x90, 0x97) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_w)
+	AM_RANGE(0x90, 0x97) AM_DEVWRITE("nmk112", nmk112_device, okibank_w)
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( bjtwin_map, AS_PROGRAM, 16, nmk16_state )
@@ -1113,7 +1112,7 @@ static ADDRESS_MAP_START( bjtwin_map, AS_PROGRAM, 16, nmk16_state )
 	AM_RANGE(0x080014, 0x080015) AM_WRITE(nmk_flipscreen_w)
 	AM_RANGE(0x084000, 0x084001) AM_DEVREADWRITE8("oki1", okim6295_device, read, write, 0x00ff)
 	AM_RANGE(0x084010, 0x084011) AM_DEVREADWRITE8("oki2", okim6295_device, read, write, 0x00ff)
-	AM_RANGE(0x084020, 0x08402f) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_lsb_w)
+	AM_RANGE(0x084020, 0x08402f) AM_DEVWRITE("nmk112", nmk112_device, okibank_lsb_w)
 	AM_RANGE(0x088000, 0x0887ff) AM_RAM_WRITE(paletteram_RRRRGGGGBBBBRGBx_word_w) AM_SHARE("paletteram")
 	AM_RANGE(0x094000, 0x094001) AM_WRITE(nmk_tilebank_w)
 	AM_RANGE(0x094002, 0x094003) AM_WRITENOP    /* IRQ enable? */
@@ -1139,7 +1138,7 @@ static ADDRESS_MAP_START( atombjt_map, AS_PROGRAM, 16, nmk16_state )
 	AM_RANGE(0x080014, 0x080015) AM_WRITE(nmk_flipscreen_w)
 //  AM_RANGE(0x084000, 0x084001) AM_DEVREADWRITE8("oki1", okim6295_device, read, write, 0x00ff)
 //  AM_RANGE(0x084010, 0x084011) AM_DEVREADWRITE8("oki2", okim6295_device, read, write, 0x00ff)
-//  AM_RANGE(0x084020, 0x08402f) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_lsb_w)
+//  AM_RANGE(0x084020, 0x08402f) AM_DEVWRITE("nmk112", nmk112_device, okibank_lsb_w)
 	AM_RANGE(0x088000, 0x0887ff) AM_RAM_WRITE(paletteram_RRRRGGGGBBBBRGBx_word_w) AM_SHARE("paletteram")
 	AM_RANGE(0x094000, 0x094001) AM_WRITE(nmk_tilebank_w)
 	AM_RANGE(0x094002, 0x094003) AM_WRITENOP    /* IRQ enable? */
diff --git a/src/mame/drivers/powerins.c b/src/mame/drivers/powerins.c
index c64181a03a6..818703c1486 100644
--- a/src/mame/drivers/powerins.c
+++ b/src/mame/drivers/powerins.c
@@ -31,7 +31,6 @@ TODO:
 #include "emu.h"
 #include "cpu/z80/z80.h"
 #include "cpu/m68000/m68000.h"
-#include "machine/nmk112.h"
 #include "sound/okim6295.h"
 #include "sound/2203intf.h"
 #include "includes/powerins.h"
@@ -124,7 +123,7 @@ static ADDRESS_MAP_START( powerins_sound_io_map, AS_IO, 8, powerins_state )
 	AM_RANGE(0x00, 0x01) AM_DEVREADWRITE("ym2203", ym2203_device, read, write)
 	AM_RANGE(0x80, 0x80) AM_DEVREADWRITE("oki1", okim6295_device, read, write)
 	AM_RANGE(0x88, 0x88) AM_DEVREADWRITE("oki2", okim6295_device, read, write)
-	AM_RANGE(0x90, 0x97) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_w)
+	AM_RANGE(0x90, 0x97) AM_DEVWRITE("nmk112", nmk112_device, okibank_w)
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( powerinb_sound_io_map, AS_IO, 8, powerins_state )
@@ -133,7 +132,7 @@ static ADDRESS_MAP_START( powerinb_sound_io_map, AS_IO, 8, powerins_state )
 	AM_RANGE(0x01, 0x01) AM_NOP
 	AM_RANGE(0x80, 0x80) AM_DEVREADWRITE("oki1", okim6295_device, read, write)
 	AM_RANGE(0x88, 0x88) AM_DEVREADWRITE("oki2", okim6295_device, read, write)
-	AM_RANGE(0x90, 0x97) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_w)
+	AM_RANGE(0x90, 0x97) AM_DEVWRITE("nmk112", nmk112_device, okibank_w)
 ADDRESS_MAP_END
 
 
diff --git a/src/mame/drivers/quizpani.c b/src/mame/drivers/quizpani.c
index dfdbee17675..b1b40602522 100644
--- a/src/mame/drivers/quizpani.c
+++ b/src/mame/drivers/quizpani.c
@@ -47,7 +47,6 @@ Stephh's notes (based on the games M68000 code and some tests) :
 
 #include "emu.h"
 #include "cpu/m68000/m68000.h"
-#include "machine/nmk112.h"
 #include "sound/okim6295.h"
 #include "includes/quizpani.h"
 
@@ -61,7 +60,7 @@ static ADDRESS_MAP_START( quizpani_map, AS_PROGRAM, 16, quizpani_state )
 	AM_RANGE(0x100016, 0x100017) AM_WRITENOP /* IRQ enable? */
 	AM_RANGE(0x100018, 0x100019) AM_WRITE(quizpani_tilesbank_w)
 	AM_RANGE(0x104000, 0x104001) AM_DEVREADWRITE8("oki", okim6295_device, read, write, 0x00ff)
-	AM_RANGE(0x104020, 0x104027) AM_DEVWRITE_LEGACY("nmk112", nmk112_okibank_lsb_w)
+	AM_RANGE(0x104020, 0x104027) AM_DEVWRITE("nmk112", nmk112_device, okibank_lsb_w)
 	AM_RANGE(0x108000, 0x1083ff) AM_RAM_WRITE(paletteram_RRRRGGGGBBBBRGBx_word_w) AM_SHARE("paletteram")
 	AM_RANGE(0x108400, 0x1085ff) AM_WRITENOP
 	AM_RANGE(0x10c000, 0x10c007) AM_RAM AM_SHARE("scrollreg")
diff --git a/src/mame/drivers/toaplan2.c b/src/mame/drivers/toaplan2.c
index bf01258e463..be0a9ab1c2c 100644
--- a/src/mame/drivers/toaplan2.c
+++ b/src/mame/drivers/toaplan2.c
@@ -353,7 +353,6 @@ To Do / Unknowns:
 #include "cpu/z80/z80.h"
 #include "cpu/z180/z180.h"
 #include "machine/eeprom.h"
-#include "machine/nmk112.h"
 #include "sound/2151intf.h"
 #include "sound/3812intf.h"
 #include "sound/okim6295.h"
@@ -838,10 +837,8 @@ WRITE8_MEMBER(toaplan2_state::raizing_z80_bankswitch_w)
 
 WRITE8_MEMBER(toaplan2_state::raizing_oki_bankswitch_w)
 {
-	nmk112_device *nmk112 = machine().device<nmk112_device>("nmk112");
-
-	nmk112_okibank_w(nmk112, space, offset,     data        & 0x0f);
-	nmk112_okibank_w(nmk112, space, offset + 1, (data >> 4) & 0x0f);
+	m_nmk112->okibank_w(space, offset, data & 0x0f);
+	m_nmk112->okibank_w(space, offset + 1, (data >> 4) & 0x0f);
 }
 
 
diff --git a/src/mame/includes/cave.h b/src/mame/includes/cave.h
index 3617fd325ed..8652520e326 100644
--- a/src/mame/includes/cave.h
+++ b/src/mame/includes/cave.h
@@ -4,6 +4,7 @@
 
 ***************************************************************************/
 #include "machine/eeprom.h"
+#include "machine/nmk112.h"
 
 struct sprite_cave
 {
@@ -36,6 +37,7 @@ public:
 			m_mirror_ram(*this, "mirror_ram"),
 			m_maincpu(*this, "maincpu"),
 			m_audiocpu(*this, "audiocpu"),
+			m_nmk112(*this, "nmk112"),
 			m_int_timer(*this, "int_timer"),
 			m_eeprom(*this, "eeprom") { }
 
@@ -116,6 +118,7 @@ public:
 	/* devices */
 	required_device<cpu_device> m_maincpu;
 	optional_device<cpu_device> m_audiocpu;
+	optional_device<nmk112_device> m_nmk112;
 	required_device<timer_device> m_int_timer;
 	int m_rasflag;
 	int m_old_rasflag;
diff --git a/src/mame/includes/nmk16.h b/src/mame/includes/nmk16.h
index e4eb053088f..e4d5efa5b7e 100644
--- a/src/mame/includes/nmk16.h
+++ b/src/mame/includes/nmk16.h
@@ -1,3 +1,4 @@
+#include "machine/nmk112.h"
 #include "sound/okim6295.h"
 
 class nmk16_state : public driver_device
@@ -5,6 +6,11 @@ class nmk16_state : public driver_device
 public:
 	nmk16_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_audiocpu(*this, "audiocpu"),
+		m_oki1(*this, "oki1"),
+		m_oki2(*this, "oki2"),
+		m_nmk112(*this, "nmk112"),
 		m_nmk_bgvideoram0(*this, "nmk_bgvideoram0"),
 		m_nmk_txvideoram(*this, "nmk_txvideoram"),
 		m_mainram(*this, "mainram"),
@@ -16,13 +22,13 @@ public:
 		m_nmk_bgvideoram2(*this, "nmk_bgvideoram2"),
 		m_nmk_bgvideoram3(*this, "nmk_bgvideoram3"),
 		m_afega_scroll_0(*this, "afega_scroll_0"),
-		m_afega_scroll_1(*this, "afega_scroll_1"),
-		m_maincpu(*this, "maincpu"),
-		m_audiocpu(*this, "audiocpu"),
-		m_oki1(*this, "oki1"),
-		m_oki2(*this, "oki2") { }
+		m_afega_scroll_1(*this, "afega_scroll_1") {}
 
-	int mask[4*2];
+	required_device<cpu_device> m_maincpu;
+	optional_device<cpu_device> m_audiocpu;
+	optional_device<okim6295_device> m_oki1;
+	optional_device<okim6295_device> m_oki2;
+	optional_device<nmk112_device> m_nmk112;
 	required_shared_ptr<UINT16> m_nmk_bgvideoram0;
 	optional_shared_ptr<UINT16> m_nmk_txvideoram;
 	required_shared_ptr<UINT16> m_mainram;
@@ -35,6 +41,7 @@ public:
 	optional_shared_ptr<UINT16> m_nmk_bgvideoram3;
 	optional_shared_ptr<UINT16> m_afega_scroll_0;
 	optional_shared_ptr<UINT16> m_afega_scroll_1;
+	int mask[4*2];
 	int m_simple_scroll;
 	int m_redraw_bitmap;
 	UINT16 *m_spriteram_old;
@@ -185,8 +192,5 @@ public:
 	void decode_tdragonb();
 	void decode_ssmissin();
 	DECLARE_WRITE_LINE_MEMBER(ym2203_irqhandler);
-	required_device<cpu_device> m_maincpu;
-	optional_device<cpu_device> m_audiocpu;
-	optional_device<okim6295_device> m_oki1;
-	optional_device<okim6295_device> m_oki2;
+	
 };
diff --git a/src/mame/includes/powerins.h b/src/mame/includes/powerins.h
index a95d4b3ff71..dd232e9a19a 100644
--- a/src/mame/includes/powerins.h
+++ b/src/mame/includes/powerins.h
@@ -1,16 +1,23 @@
+#include "machine/nmk112.h"
+
 class powerins_state : public driver_device
 {
 public:
 	powerins_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_soundcpu(*this, "soundcpu"),
+		m_nmk112(*this, "nmk112"),
 		m_vctrl_0(*this, "vctrl_0"),
 		m_vram_0(*this, "vram_0"),
 		m_vram_1(*this, "vram_1"),
-		m_spriteram(*this, "spriteram"),
-		m_maincpu(*this, "maincpu"),
-		m_soundcpu(*this, "soundcpu") { }
+		m_spriteram(*this, "spriteram")
+		{ }
 
-	int m_oki_bank;
+	
+	required_device<cpu_device> m_maincpu;
+	optional_device<cpu_device> m_soundcpu;
+	optional_device<nmk112_device> m_nmk112;
 	required_shared_ptr<UINT16> m_vctrl_0;
 	required_shared_ptr<UINT16> m_vram_0;
 	required_shared_ptr<UINT16> m_vram_1;
@@ -18,6 +25,7 @@ public:
 	UINT16 *m_vctrl_1;
 	tilemap_t *m_tilemap_0;
 	tilemap_t *m_tilemap_1;
+	int m_oki_bank;
 	int m_tile_bank;
 	DECLARE_WRITE16_MEMBER(powerins_okibank_w);
 	DECLARE_WRITE16_MEMBER(powerins_soundlatch_w);
@@ -35,6 +43,4 @@ public:
 	UINT32 screen_update_powerins(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	void draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect);
 	DECLARE_WRITE_LINE_MEMBER(irqhandler);
-	required_device<cpu_device> m_maincpu;
-	optional_device<cpu_device> m_soundcpu;
 };
diff --git a/src/mame/includes/quizpani.h b/src/mame/includes/quizpani.h
index 8dd929d4d80..9eb769baa6c 100644
--- a/src/mame/includes/quizpani.h
+++ b/src/mame/includes/quizpani.h
@@ -1,13 +1,18 @@
+#include "machine/nmk112.h"
+
 class quizpani_state : public driver_device
 {
 public:
 	quizpani_state(const machine_config &mconfig, device_type type, const char *tag)
 		: driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_nmk112(*this, "nmk112"),
 		m_scrollreg(*this, "scrollreg"),
 		m_bg_videoram(*this, "bg_videoram"),
-		m_txt_videoram(*this, "txt_videoram"),
-		m_maincpu(*this, "maincpu") { }
+		m_txt_videoram(*this, "txt_videoram") { }
 
+	required_device<cpu_device> m_maincpu;
+	required_device<nmk112_device> m_nmk112;
 	required_shared_ptr<UINT16> m_scrollreg;
 	required_shared_ptr<UINT16> m_bg_videoram;
 	required_shared_ptr<UINT16> m_txt_videoram;
@@ -23,5 +28,4 @@ public:
 	TILE_GET_INFO_MEMBER(txt_tile_info);
 	virtual void video_start();
 	UINT32 screen_update_quizpani(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
-	required_device<cpu_device> m_maincpu;
 };
diff --git a/src/mame/includes/toaplan2.h b/src/mame/includes/toaplan2.h
index 3b3359854d8..60145fa569c 100644
--- a/src/mame/includes/toaplan2.h
+++ b/src/mame/includes/toaplan2.h
@@ -1,4 +1,6 @@
 #include "machine/eeprom.h"
+#include "machine/nmk112.h"
+
 /**************** Machine stuff ******************/
 //#define USE_HD64x180          /* Define if CPU support is available */
 //#define TRUXTON2_STEREO       /* Uncomment to hear truxton2 music in stereo */
@@ -29,6 +31,7 @@ public:
 		m_mainram16(*this, "mainram16"),
 		m_maincpu(*this, "maincpu"),
 		m_audiocpu(*this, "audiocpu"),
+		m_nmk112(*this, "nmk112"),
 		m_oki(*this, "oki"),
 		m_oki1(*this, "oki1"),
 		m_eeprom(*this, "eeprom") {
@@ -147,6 +150,7 @@ public:
 	DECLARE_WRITE_LINE_MEMBER(bbakraid_irqhandler);
 	required_device<cpu_device> m_maincpu;
 	optional_device<cpu_device> m_audiocpu;
+	optional_device<nmk112_device> m_nmk112;
 	optional_device<okim6295_device> m_oki;
 	optional_device<okim6295_device> m_oki1;
 	optional_device<eeprom_device> m_eeprom;
diff --git a/src/mame/machine/nmk112.c b/src/mame/machine/nmk112.c
index 44cae598a9c..8fb0a61e68e 100644
--- a/src/mame/machine/nmk112.c
+++ b/src/mame/machine/nmk112.c
@@ -13,50 +13,86 @@
 #define TABLESIZE   0x100
 #define BANKSIZE    0x10000
 
-struct nmk112_state
+
+
+const device_type NMK112 = &device_creator<nmk112_device>;
+
+nmk112_device::nmk112_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: device_t(mconfig, NMK112, "NMK 112", tag, owner, clock)
 {
-	/* which chips have their sample address table divided into pages */
-	UINT8 page_mask;
-
-	UINT8 current_bank[8];
-
-	UINT8 *rom0, *rom1;
-	int   size0, size1;
-};
-
-/*****************************************************************************
-    INLINE FUNCTIONS
-*****************************************************************************/
-
-INLINE nmk112_state *get_safe_token( device_t *device )
-{
-	assert(device != NULL);
-	assert(device->type() == NMK112);
-
-	return (nmk112_state *)downcast<nmk112_device *>(device)->token();
 }
 
-INLINE const nmk112_interface *get_interface( device_t *device )
+//-------------------------------------------------
+//  device_config_complete - perform any
+//  operations now that the configuration is
+//  complete
+//-------------------------------------------------
+
+void nmk112_device::device_config_complete()
 {
-	assert(device != NULL);
-	assert((device->type() == NMK112));
-	return (const nmk112_interface *) device->static_config();
+
 }
 
-/*****************************************************************************
-    STATIC FUNCTIONS
-*****************************************************************************/
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
 
-static void do_bankswitch( nmk112_state *nmk112, int offset, int data )
+void nmk112_device::device_start()
+{
+	const nmk112_interface *intf = (const nmk112_interface *)static_config();
+	
+	if (intf->rgn0 == NULL)
+	{
+		m_rom0 = NULL;
+		m_size0 = 0;
+	}
+	else
+	{
+		m_rom0 = machine().root_device().memregion(intf->rgn0)->base();
+		m_size0 = machine().root_device().memregion(intf->rgn0)->bytes() - 0x40000;
+	}
+
+	if (intf->rgn1 == NULL)
+	{
+		m_rom1 = NULL;
+		m_size1 = 0;
+	}
+	else
+	{
+		m_rom1 = machine().root_device().memregion(intf->rgn1)->base();
+		m_size1 = machine().root_device().memregion(intf->rgn1)->bytes() - 0x40000;
+	}
+
+	m_page_mask = ~intf->disable_page_mask;
+
+	save_item(NAME(m_current_bank));
+	machine().save().register_postload(save_prepost_delegate(FUNC(nmk112_device::postload_bankswitch), this));
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void nmk112_device::device_reset()
+{
+	for (int i = 0; i < 8; i++)
+	{
+		m_current_bank[i] = 0;
+		do_bankswitch(i, m_current_bank[i]);
+	}
+}
+
+
+void nmk112_device::do_bankswitch( int offset, int data )
 {
 	int chip = (offset & 4) >> 2;
 	int banknum = offset & 3;
-	int paged = (nmk112->page_mask & (1 << chip));
+	int paged = (m_page_mask & (1 << chip));
 
-	UINT8 *rom = chip ? nmk112->rom1 : nmk112->rom0;
-	int size = chip ? nmk112->size1 : nmk112->size0;
+	UINT8 *rom = chip ? m_rom1 : m_rom0;
+	int size = chip ? m_size1 : m_size0;
 
-	nmk112->current_bank[offset] = data;
+	m_current_bank[offset] = data;
 
 	if (size == 0) return;
 
@@ -80,109 +116,22 @@ static void do_bankswitch( nmk112_state *nmk112, int offset, int data )
     DEVICE HANDLERS
 *****************************************************************************/
 
-WRITE8_DEVICE_HANDLER( nmk112_okibank_w )
+WRITE8_MEMBER( nmk112_device::okibank_w )
 {
-	nmk112_state *nmk112 = get_safe_token(device);
-
-	if (nmk112->current_bank[offset] != data)
-		do_bankswitch(nmk112, offset, data);
+	if (m_current_bank[offset] != data)
+		do_bankswitch(offset, data);
 }
 
-WRITE16_DEVICE_HANDLER( nmk112_okibank_lsb_w )
+WRITE16_MEMBER( nmk112_device::okibank_lsb_w )
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		nmk112_okibank_w(device, space, offset, data & 0xff);
+		okibank_w(space, offset, data & 0xff);
 	}
 }
 
-static void nmk112_postload_bankswitch(nmk112_state *nmk112)
+void nmk112_device::postload_bankswitch()
 {
 	for (int i = 0; i < 8; i++)
-		do_bankswitch(nmk112, i, nmk112->current_bank[i]);
-}
-
-
-/*****************************************************************************
-    DEVICE INTERFACE
-*****************************************************************************/
-
-static DEVICE_START( nmk112 )
-{
-	nmk112_state *nmk112 = get_safe_token(device);
-	const nmk112_interface *intf = get_interface(device);
-
-	if (intf->rgn0 == NULL)
-	{
-		nmk112->rom0 = NULL;
-		nmk112->size0 = 0;
-	}
-	else
-	{
-		nmk112->rom0 = device->machine().root_device().memregion(intf->rgn0)->base();
-		nmk112->size0 = device->machine().root_device().memregion(intf->rgn0)->bytes() - 0x40000;
-	}
-
-	if (intf->rgn1 == NULL)
-	{
-		nmk112->rom1 = NULL;
-		nmk112->size1 = 0;
-	}
-	else
-	{
-		nmk112->rom1 = device->machine().root_device().memregion(intf->rgn1)->base();
-		nmk112->size1 = device->machine().root_device().memregion(intf->rgn1)->bytes() - 0x40000;
-	}
-
-	nmk112->page_mask = ~intf->disable_page_mask;
-
-	device->save_item(NAME(nmk112->current_bank));
-	device->machine().save().register_postload(save_prepost_delegate(FUNC(nmk112_postload_bankswitch), nmk112));
-}
-
-static DEVICE_RESET( nmk112 )
-{
-	nmk112_state *nmk112 = get_safe_token(device);
-
-	for (int i = 0; i < 8; i++)
-	{
-		nmk112->current_bank[i] = 0;
-		do_bankswitch(nmk112, i, nmk112->current_bank[i]);
-	}
-}
-
-const device_type NMK112 = &device_creator<nmk112_device>;
-
-nmk112_device::nmk112_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: device_t(mconfig, NMK112, "NMK 112", tag, owner, clock)
-{
-	m_token = global_alloc_clear(nmk112_state);
-}
-
-//-------------------------------------------------
-//  device_config_complete - perform any
-//  operations now that the configuration is
-//  complete
-//-------------------------------------------------
-
-void nmk112_device::device_config_complete()
-{
-}
-
-//-------------------------------------------------
-//  device_start - device-specific startup
-//-------------------------------------------------
-
-void nmk112_device::device_start()
-{
-	DEVICE_START_NAME( nmk112 )(this);
-}
-
-//-------------------------------------------------
-//  device_reset - device-specific reset
-//-------------------------------------------------
-
-void nmk112_device::device_reset()
-{
-	DEVICE_RESET_NAME( nmk112 )(this);
+		do_bankswitch(i, m_current_bank[i]);
 }
diff --git a/src/mame/machine/nmk112.h b/src/mame/machine/nmk112.h
index 2a4c472c94a..00fd4508b79 100644
--- a/src/mame/machine/nmk112.h
+++ b/src/mame/machine/nmk112.h
@@ -19,22 +19,35 @@ struct nmk112_interface
 	UINT8 disable_page_mask;
 };
 
-class nmk112_device : public device_t
+class nmk112_device : public device_t,
+									public nmk112_interface
 {
 public:
 	nmk112_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
-	~nmk112_device() { global_free(m_token); }
+	~nmk112_device() {}
+
+	DECLARE_WRITE8_MEMBER( okibank_w );
+	DECLARE_WRITE16_MEMBER( okibank_lsb_w );
 
-	// access to legacy token
-	void *token() const { assert(m_token != NULL); return m_token; }
 protected:
 	// device-level overrides
 	virtual void device_config_complete();
 	virtual void device_start();
 	virtual void device_reset();
+	
 private:
+	void do_bankswitch( int offset, int data );
+	void postload_bankswitch();
+	
 	// internal state
-	void *m_token;
+	
+	/* which chips have their sample address table divided into pages */
+	UINT8 m_page_mask;
+
+	UINT8 m_current_bank[8];
+
+	UINT8 *m_rom0, *m_rom1;
+	int   m_size0, m_size1;
 };
 
 extern const device_type NMK112;
@@ -48,12 +61,4 @@ extern const device_type NMK112;
 	MCFG_DEVICE_ADD(_tag, NMK112, 0) \
 	MCFG_DEVICE_CONFIG(_interface)
 
-/***************************************************************************
-    DEVICE I/O FUNCTIONS
-***************************************************************************/
-
-DECLARE_WRITE8_DEVICE_HANDLER( nmk112_okibank_w );
-DECLARE_WRITE16_DEVICE_HANDLER( nmk112_okibank_lsb_w );
-
-
 #endif /* __NMK112_H__ */