diff --git a/src/emu/addrmap.h b/src/emu/addrmap.h
index 390e82e0292..92c5d88d764 100644
--- a/src/emu/addrmap.h
+++ b/src/emu/addrmap.h
@@ -736,9 +736,6 @@ void _class :: _name(address_map &map, const device_t &device) \
 #define AM_SHARE(_tag) \
 	curentry->set_share(_tag); \
 
-#define AM_BASE_LEGACY(_base) \
-	curentry->set_baseptr(_base); \
-
 
 // common shortcuts
 #define AM_ROMBANK(_bank)					AM_READ_BANK(_bank)
diff --git a/src/mame/audio/t5182.c b/src/mame/audio/t5182.c
index f16b1f61354..8535b36cde7 100644
--- a/src/mame/audio/t5182.c
+++ b/src/mame/audio/t5182.c
@@ -162,6 +162,11 @@ enum
 static UINT8 *t5182_sharedram;
 static int irqstate;
 
+void t5182_init(running_machine &machine)
+{
+	t5182_sharedram = reinterpret_cast<UINT8 *>(machine.root_device().memshare("t5182_sharedram")->ptr());
+}
+
 READ8_HANDLER(t5182_sharedram_r)
 {
 	return t5182_sharedram[offset];
@@ -298,7 +303,7 @@ const ym2151_interface t5182_ym2151_interface =
 ADDRESS_MAP_START( t5182_map, AS_PROGRAM, 8, driver_device )
 	AM_RANGE(0x0000, 0x1fff) AM_ROM	// internal ROM
 	AM_RANGE(0x2000, 0x27ff) AM_RAM	AM_MIRROR(0x1800) // internal RAM
-	AM_RANGE(0x4000, 0x40ff) AM_RAM AM_MIRROR(0x3F00) AM_BASE_LEGACY(&t5182_sharedram) // 2016 with four 74ls245s, one each for main and t5182 address and data. pins 23, 22, 20, 19, 18 are all tied low so only 256 bytes are usable
+	AM_RANGE(0x4000, 0x40ff) AM_RAM AM_MIRROR(0x3F00) AM_SHARE("t5182_sharedram") // 2016 with four 74ls245s, one each for main and t5182 address and data. pins 23, 22, 20, 19, 18 are all tied low so only 256 bytes are usable
 	AM_RANGE(0x8000, 0xffff) AM_ROM	// external ROM
 ADDRESS_MAP_END
 
diff --git a/src/mame/audio/t5182.h b/src/mame/audio/t5182.h
index bb0d3f29c08..20a30e5c78c 100644
--- a/src/mame/audio/t5182.h
+++ b/src/mame/audio/t5182.h
@@ -5,6 +5,8 @@
 #define CPUTAG_T5182 "t5182"
 #define T5182COINPORT "T5182_COIN"
 
+void t5182_init(running_machine &machine);
+
 ADDRESS_MAP_EXTERN( t5182_map, 8 );
 ADDRESS_MAP_EXTERN( t5182_io, 8 );
 
diff --git a/src/mame/drivers/aleck64.c b/src/mame/drivers/aleck64.c
index fdb9ac1e48e..4c64c5c5fd1 100644
--- a/src/mame/drivers/aleck64.c
+++ b/src/mame/drivers/aleck64.c
@@ -276,11 +276,11 @@ static READ32_HANDLER( aleck_dips_r )
  */
 
 static ADDRESS_MAP_START( n64_map, AS_PROGRAM, 32, n64_state )
-	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	/*AM_MIRROR(0xc0000000)*/ AM_BASE_LEGACY(&rdram)				// RDRAM
+	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	/*AM_MIRROR(0xc0000000)*/ AM_SHARE("rdram")				// RDRAM
 
 	AM_RANGE(0x03f00000, 0x03f00027) AM_DEVREADWRITE("rcp", n64_periphs, rdram_reg_r, rdram_reg_w)
-	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("dmem")					// RSP DMEM
-	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("imem")					// RSP IMEM
+	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("rsp_dmem")					// RSP DMEM
+	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("rsp_imem")					// RSP IMEM
 	AM_RANGE(0x04040000, 0x040fffff) AM_DEVREADWRITE_LEGACY("rsp", n64_sp_reg_r, n64_sp_reg_w)	// RSP
 	AM_RANGE(0x04100000, 0x041fffff) AM_DEVREADWRITE_LEGACY("rsp", n64_dp_reg_r, n64_dp_reg_w)	// RDP
 	AM_RANGE(0x04300000, 0x043fffff) AM_DEVREADWRITE("rcp", n64_periphs, mi_reg_r, mi_reg_w)	// MIPS Interface
@@ -305,10 +305,10 @@ static ADDRESS_MAP_START( n64_map, AS_PROGRAM, 32, n64_state )
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( rsp_map, AS_PROGRAM, 32, n64_state )
-	AM_RANGE(0x00000000, 0x00000fff) AM_RAM AM_SHARE("dmem")
-	AM_RANGE(0x00001000, 0x00001fff) AM_RAM AM_SHARE("imem")
-	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_BASE_LEGACY(&rsp_dmem) AM_SHARE("dmem")
-	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_BASE_LEGACY(&rsp_imem) AM_SHARE("imem")
+	AM_RANGE(0x00000000, 0x00000fff) AM_RAM AM_SHARE("rsp_dmem")
+	AM_RANGE(0x00001000, 0x00001fff) AM_RAM AM_SHARE("rsp_imem")
+	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("rsp_dmem")
+	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("rsp_imem")
 ADDRESS_MAP_END
 
 static INPUT_PORTS_START( aleck64 )
diff --git a/src/mame/drivers/darkmist.c b/src/mame/drivers/darkmist.c
index bc2eb57b2d0..3903bb9236a 100644
--- a/src/mame/drivers/darkmist.c
+++ b/src/mame/drivers/darkmist.c
@@ -408,6 +408,8 @@ DRIVER_INIT_MEMBER(darkmist_state,darkmist)
 	UINT8 *buffer = auto_alloc_array(machine(), UINT8, 0x10000);
 	UINT8 *decrypt = auto_alloc_array(machine(), UINT8, 0x8000);
 
+	t5182_init(machine());
+
 	decrypt_gfx(machine());
 
 	decrypt_snd(machine());
diff --git a/src/mame/drivers/konamigx.c b/src/mame/drivers/konamigx.c
index 4efd47d5c80..040943510c4 100644
--- a/src/mame/drivers/konamigx.c
+++ b/src/mame/drivers/konamigx.c
@@ -1213,7 +1213,7 @@ static ADDRESS_MAP_START( gx_type3_map, AS_PROGRAM, 32, konamigx_state )
 	//AM_RANGE(0xcc0000, 0xcc0007) AM_WRITE(type4_prot_w)
 	AM_RANGE(0xe00000, 0xe0001f) AM_RAM AM_SHARE("k053936_0_ctrl")
 	//AM_RANGE(0xe20000, 0xe20003) AM_WRITENOP
-	AM_RANGE(0xe40000, 0xe40003) AM_WRITE(konamigx_type3_psac2_bank_w) AM_BASE_LEGACY(&konamigx_type3_psac2_bank)
+	AM_RANGE(0xe40000, 0xe40003) AM_WRITE(konamigx_type3_psac2_bank_w) AM_SHARE("psac2_bank")
 	AM_RANGE(0xe60000, 0xe60fff) AM_RAM AM_SHARE("k053936_0_line")
 	AM_RANGE(0xe80000, 0xe83fff) AM_RAM AM_SHARE("paletteram")	// main monitor palette
 	AM_RANGE(0xea0000, 0xea3fff) AM_RAM AM_SHARE("subpaletteram")
diff --git a/src/mame/drivers/ms32.c b/src/mame/drivers/ms32.c
index 88e0e1c1f06..b6eb0cc60e7 100644
--- a/src/mame/drivers/ms32.c
+++ b/src/mame/drivers/ms32.c
@@ -363,7 +363,7 @@ static ADDRESS_MAP_START( ms32_map, AS_PROGRAM, 32, ms32_state )
 	AM_RANGE(0xfce00034, 0xfce00037) AM_WRITENOP // irq ack?
 	AM_RANGE(0xfce00038, 0xfce0003b) AM_WRITE(reset_sub_w)
 	AM_RANGE(0xfce00050, 0xfce0005f) AM_WRITENOP	// watchdog? I haven't investigated
-//  AM_RANGE(0xfce00000, 0xfce0007f) AM_WRITEONLY AM_BASE_LEGACY(&ms32_fce00000) /* registers not ram? */
+//  AM_RANGE(0xfce00000, 0xfce0007f) AM_WRITEONLY AM_SHARE("ms32_fce00000") /* registers not ram? */
 	AM_RANGE(0xfce00000, 0xfce00003) AM_WRITE(ms32_gfxctrl_w)	/* flip screen + other unknown bits */
 	AM_RANGE(0xfce00280, 0xfce0028f) AM_WRITE(ms32_brightness_w)	// global brightness control
 /**/AM_RANGE(0xfce00600, 0xfce0065f) AM_RAM AM_SHARE("roz_ctrl")		/* roz control registers */
diff --git a/src/mame/drivers/mustache.c b/src/mame/drivers/mustache.c
index 2c9eccb7e95..31e61b349a5 100644
--- a/src/mame/drivers/mustache.c
+++ b/src/mame/drivers/mustache.c
@@ -250,6 +250,8 @@ ROM_END
 
 DRIVER_INIT_MEMBER(mustache_state,mustache)
 {
+	t5182_init(machine());
+
 	int i;
 
 	int G1 = machine().root_device().memregion("gfx1")->bytes()/3;
diff --git a/src/mame/drivers/namcos2.c b/src/mame/drivers/namcos2.c
index 8edeef981ad..7a2b67184dd 100644
--- a/src/mame/drivers/namcos2.c
+++ b/src/mame/drivers/namcos2.c
@@ -594,8 +594,8 @@ static ADDRESS_MAP_START( namcos2_68k_default_cpu_board_am, AS_PROGRAM, 16, namc
 	AM_RANGE(0x440000, 0x44ffff) AM_READWRITE(paletteram_word_r,paletteram_word_w) AM_SHARE("paletteram")
 	AM_RANGE(0x460000, 0x460fff) AM_READWRITE(dpram_word_r,dpram_word_w)
 	AM_RANGE(0x468000, 0x468fff) AM_READWRITE(dpram_word_r,dpram_word_w) /* mirror */
-	AM_RANGE(0x480000, 0x483fff) AM_READWRITE_LEGACY(namcos2_68k_serial_comms_ram_r,namcos2_68k_serial_comms_ram_w) AM_BASE_LEGACY(&namcos2_68k_serial_comms_ram)
-	AM_RANGE(0x4a0000, 0x4a000f) AM_READWRITE_LEGACY(namcos2_68k_serial_comms_ctrl_r,namcos2_68k_serial_comms_ctrl_w)
+	AM_RANGE(0x480000, 0x483fff) AM_READWRITE(serial_comms_ram_r,serial_comms_ram_w) AM_SHARE("serialram")
+	AM_RANGE(0x4a0000, 0x4a000f) AM_READWRITE(serial_comms_ctrl_r,serial_comms_ctrl_w)
 ADDRESS_MAP_END
 
 /*************************************************************/
diff --git a/src/mame/drivers/naomi.c b/src/mame/drivers/naomi.c
index 4b90084ee87..882038d48f5 100644
--- a/src/mame/drivers/naomi.c
+++ b/src/mame/drivers/naomi.c
@@ -1582,7 +1582,7 @@ static ADDRESS_MAP_START( naomi_map, AS_PROGRAM, 64, dc_state )
 	AM_RANGE(0x08000000, 0x09ffffff) AM_MIRROR(0x02000000) AM_NOP // 'Unassigned'
 
 	/* Area 3 */
-	AM_RANGE(0x0c000000, 0x0dffffff) AM_MIRROR(0xa2000000) AM_RAM AM_BASE_LEGACY(&naomi_ram64)
+	AM_RANGE(0x0c000000, 0x0dffffff) AM_MIRROR(0xa2000000) AM_RAM AM_SHARE("dc_ram")
 
 	/* Area 4 */
 	AM_RANGE(0x10000000, 0x107fffff) AM_MIRROR(0x02000000) AM_WRITE_LEGACY(ta_fifo_poly_w )
@@ -1644,7 +1644,7 @@ static ADDRESS_MAP_START( naomi2_map, AS_PROGRAM, 64, dc_state )
     AM_RANGE(0x0a000000, 0x0bffffff) AM_RAM AM_SHARE("elan_ram") // T&L chip RAM
 
 	/* Area 3 */
-	AM_RANGE(0x0c000000, 0x0dffffff) AM_MIRROR(0xa2000000) AM_RAM AM_BASE_LEGACY(&naomi_ram64)
+	AM_RANGE(0x0c000000, 0x0dffffff) AM_MIRROR(0xa2000000) AM_RAM AM_SHARE("dc_ram")
 
 	/* Area 4 */
 	AM_RANGE(0x10000000, 0x107fffff) AM_WRITE_LEGACY(ta_fifo_poly_w )
@@ -1786,13 +1786,13 @@ static ADDRESS_MAP_START( aw_map, AS_PROGRAM, 64, dc_state )
 	AM_RANGE(0x08000000, 0x0bffffff) AM_NOP // 'Unassigned'
 
 	/* Area 3 */
-	AM_RANGE(0x0c000000, 0x0cffffff) AM_RAM AM_BASE_LEGACY(&naomi_ram64) AM_SHARE("share4")
-	AM_RANGE(0x0d000000, 0x0dffffff) AM_RAM AM_SHARE("share4")// extra ram on Naomi (mirror on DC)
-	AM_RANGE(0x0e000000, 0x0effffff) AM_RAM AM_SHARE("share4")// mirror
-	AM_RANGE(0x0f000000, 0x0fffffff) AM_RAM AM_SHARE("share4")// mirror
+	AM_RANGE(0x0c000000, 0x0cffffff) AM_RAM AM_SHARE("dc_ram")
+	AM_RANGE(0x0d000000, 0x0dffffff) AM_RAM AM_SHARE("dc_ram")// extra ram on Naomi (mirror on DC)
+	AM_RANGE(0x0e000000, 0x0effffff) AM_RAM AM_SHARE("dc_ram")// mirror
+	AM_RANGE(0x0f000000, 0x0fffffff) AM_RAM AM_SHARE("dc_ram")// mirror
 
-	AM_RANGE(0x8c000000, 0x8cffffff) AM_RAM AM_SHARE("share4") // RAM access through cache
-	AM_RANGE(0x8d000000, 0x8dffffff) AM_RAM AM_SHARE("share4") // RAM access through cache
+	AM_RANGE(0x8c000000, 0x8cffffff) AM_RAM AM_SHARE("dc_ram") // RAM access through cache
+	AM_RANGE(0x8d000000, 0x8dffffff) AM_RAM AM_SHARE("dc_ram") // RAM access through cache
 
 	/* Area 4 - half the texture memory, like dreamcast, not naomi */
 	AM_RANGE(0x10000000, 0x107fffff) AM_MIRROR(0x02000000) AM_WRITE_LEGACY(ta_fifo_poly_w )
diff --git a/src/mame/drivers/neogeo.c b/src/mame/drivers/neogeo.c
index 813717104d3..ebef77b2815 100644
--- a/src/mame/drivers/neogeo.c
+++ b/src/mame/drivers/neogeo.c
@@ -167,7 +167,6 @@
  *************************************/
 
 static UINT8 *memcard_data;
-static UINT16 *save_ram;
 
 static const char *audio_banks[4] =
 {
@@ -499,7 +498,7 @@ WRITE16_MEMBER(neogeo_state::save_ram_w)
 {
 
 	if (m_save_ram_unlocked)
-		COMBINE_DATA(&save_ram[offset]);
+		COMBINE_DATA(&m_save_ram[offset]);
 }
 
 
@@ -992,7 +991,7 @@ static MACHINE_START( neogeo )
 	neogeo_state *state = machine.driver_data<neogeo_state>();
 
 	/* configure NVRAM */
-	machine.device<nvram_device>("saveram")->set_base(save_ram, 0x10000);
+	machine.device<nvram_device>("saveram")->set_base(state->m_save_ram, 0x10000);
 
 	/* set the BIOS bank */
 	state->membank(NEOGEO_BANK_BIOS)->set_base(state->memregion("mainbios")->base());
@@ -1105,7 +1104,7 @@ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 16, neogeo_state )
 	AM_RANGE(0x400000, 0x401fff) AM_MIRROR(0x3fe000) AM_READWRITE(neogeo_paletteram_r, neogeo_paletteram_w)
 	AM_RANGE(0x800000, 0x800fff) AM_READWRITE(memcard_r, memcard_w)
 	AM_RANGE(0xc00000, 0xc1ffff) AM_MIRROR(0x0e0000) AM_ROMBANK(NEOGEO_BANK_BIOS)
-	AM_RANGE(0xd00000, 0xd0ffff) AM_MIRROR(0x0f0000) AM_RAM_WRITE(save_ram_w) AM_BASE_LEGACY(&save_ram)
+	AM_RANGE(0xd00000, 0xd0ffff) AM_MIRROR(0x0f0000) AM_RAM_WRITE(save_ram_w) AM_SHARE("save_ram")
 	AM_RANGE(0xe00000, 0xffffff) AM_READ(neogeo_unmapped_r)
 ADDRESS_MAP_END
 
diff --git a/src/mame/drivers/nmk16.c b/src/mame/drivers/nmk16.c
index ed9436d1f11..a13df75b8ec 100644
--- a/src/mame/drivers/nmk16.c
+++ b/src/mame/drivers/nmk16.c
@@ -882,8 +882,8 @@ static ADDRESS_MAP_START( tdragon_map, AS_PROGRAM, 16, nmk16_state )
 	AM_RANGE(0x044022, 0x044023) AM_READNOP  /* No Idea */
 //  AM_RANGE(0x0b0000, 0x0b7fff) AM_RAM    /* Work RAM */
 //  AM_RANGE(0x0b8000, 0x0b8fff) AM_RAM AM_SHARE("spriteram") /* Sprite RAM */
-//  AM_RANGE(0x0b9000, 0x0bdfff) AM_RAM AM_BASE_LEGACY(&nmk16_mcu_work_ram)   /* Work RAM */
-//  AM_RANGE(0x0be000, 0x0befff) AM_READWRITE(mcu_shared_r,tdragon_mcu_shared_w) AM_BASE_LEGACY(&nmk16_mcu_shared_ram)  /* Work RAM */
+//  AM_RANGE(0x0b9000, 0x0bdfff) AM_RAM AM_SHARE("mcu_work_ram")   /* Work RAM */
+//  AM_RANGE(0x0be000, 0x0befff) AM_READWRITE(mcu_shared_r,tdragon_mcu_shared_w) AM_SHARE("mcu_shared_ram")  /* Work RAM */
 //  AM_RANGE(0x0bf000, 0x0bffff) AM_RAM    /* Work RAM */
 	AM_RANGE(0x0b0000, 0x0bffff) AM_RAM_WRITE(tdragon_mainram_w ) AM_SHARE("mainram")
 	AM_RANGE(0x0c0000, 0x0c0001) AM_READ_PORT("IN0")
diff --git a/src/mame/drivers/panicr.c b/src/mame/drivers/panicr.c
index fc4017d86dd..b0af96aa2b8 100644
--- a/src/mame/drivers/panicr.c
+++ b/src/mame/drivers/panicr.c
@@ -619,6 +619,8 @@ DRIVER_INIT_MEMBER(panicr_state,panicr)
 	int size;
 	int i,j;
 
+	t5182_init(machine());
+
 	rom = machine().root_device().memregion("gfx1")->base();
 	size = machine().root_device().memregion("gfx1")->bytes();
 
diff --git a/src/mame/drivers/pgm.c b/src/mame/drivers/pgm.c
index 517979b1d19..5e5a96e24c3 100644
--- a/src/mame/drivers/pgm.c
+++ b/src/mame/drivers/pgm.c
@@ -191,9 +191,6 @@ Notes:
 #include "includes/pgm.h"
 
 
-UINT16 *pgm_mainram;
-
-
 READ16_MEMBER(pgm_state::pgm_videoram_r)
 {
 
@@ -320,7 +317,7 @@ ADDRESS_MAP_END
 ADDRESS_MAP_START( pgm_base_mem, AS_PROGRAM, 16, pgm_state )
 	AM_RANGE(0x700006, 0x700007) AM_WRITENOP // Watchdog?
 
-	AM_RANGE(0x800000, 0x81ffff) AM_RAM AM_MIRROR(0x0e0000) AM_BASE_LEGACY(&pgm_mainram) AM_SHARE("sram") /* Main Ram */
+	AM_RANGE(0x800000, 0x81ffff) AM_RAM AM_MIRROR(0x0e0000) AM_SHARE("sram") /* Main Ram */
 
 	AM_RANGE(0x900000, 0x907fff) AM_MIRROR(0x0f8000) AM_READWRITE(pgm_videoram_r, pgm_videoram_w) AM_SHARE("videoram") /* IGS023 VIDEO CHIP */
 	AM_RANGE(0xa00000, 0xa011ff) AM_RAM_WRITE(paletteram_xRRRRRGGGGGBBBBB_word_w) AM_SHARE("paletteram")
diff --git a/src/mame/drivers/spool99.c b/src/mame/drivers/spool99.c
index d31f6ee916f..d67355618a3 100644
--- a/src/mame/drivers/spool99.c
+++ b/src/mame/drivers/spool99.c
@@ -276,7 +276,7 @@ static ADDRESS_MAP_START( vcarn_map, AS_PROGRAM, 8, spool99_state )
 	AM_RANGE(0xa800, 0xabff) AM_RAM_WRITE(paletteram_xxxxBBBBGGGGRRRR_byte_le_w) AM_SHARE("paletteram")
 
 	AM_RANGE(0xb000, 0xdfff) AM_RAM
-//  AM_RANGE(0xdf00, 0xdfff) AM_READWRITE(vcarn_io_r,vcarn_io_w) AM_BASE_LEGACY(&vcarn_io)
+//  AM_RANGE(0xdf00, 0xdfff) AM_READWRITE(vcarn_io_r,vcarn_io_w) AM_SHARE("vcarn_io")
 	AM_RANGE(0xe000, 0xefff) AM_RAM_WRITE(spool99_vram_w) AM_SHARE("vram")
 	AM_RANGE(0xf000, 0xffff) AM_RAM_WRITE(spool99_cram_w) AM_SHARE("cram")
 ADDRESS_MAP_END
diff --git a/src/mame/drivers/tmmjprd.c b/src/mame/drivers/tmmjprd.c
index cdebcaaddd2..5eeda37b302 100644
--- a/src/mame/drivers/tmmjprd.c
+++ b/src/mame/drivers/tmmjprd.c
@@ -672,7 +672,7 @@ static ADDRESS_MAP_START( tmmjprd_map, AS_PROGRAM, 32, tmmjprd_state )
 	AM_RANGE(0x000000, 0x1fffff) AM_ROM
 	AM_RANGE(0x200010, 0x200013) AM_READ(randomtmmjprds) // gfx chip status?
 	/* check these are used .. */
-//  AM_RANGE(0x200010, 0x200013) AM_WRITEONLY AM_BASE_LEGACY(&tmmjprd_viewregs0 )
+//  AM_RANGE(0x200010, 0x200013) AM_WRITEONLY AM_SHARE("tmmjprd_viewregs0")
 	AM_RANGE(0x200100, 0x200117) AM_WRITEONLY AM_SHARE("tilemap_regs.0" ) // tilemap regs1
 	AM_RANGE(0x200120, 0x200137) AM_WRITEONLY AM_SHARE("tilemap_regs.1" ) // tilemap regs2
 	AM_RANGE(0x200140, 0x200157) AM_WRITEONLY AM_SHARE("tilemap_regs.2" ) // tilemap regs3
@@ -681,12 +681,12 @@ static ADDRESS_MAP_START( tmmjprd_map, AS_PROGRAM, 32, tmmjprd_state )
 //  AM_RANGE(0x200300, 0x200303) AM_WRITE_LEGACY(tmmjprd_rombank_w) // used during rom testing, rombank/area select + something else?
 	AM_RANGE(0x20040c, 0x20040f) AM_WRITE(tmmjprd_brt_1_w)
     AM_RANGE(0x200410, 0x200413) AM_WRITE(tmmjprd_brt_2_w)
-//  AM_RANGE(0x200500, 0x200503) AM_WRITEONLY AM_BASE_LEGACY(&tmmjprd_viewregs7 )
-//  AM_RANGE(0x200700, 0x20070f) AM_WRITE(tmmjprd_blitter_w) AM_BASE_LEGACY(&tmmjprd_blitterregs )
-//  AM_RANGE(0x200800, 0x20080f) AM_WRITEONLY AM_BASE_LEGACY(&tmmjprd_viewregs9 ) // never changes?
+//  AM_RANGE(0x200500, 0x200503) AM_WRITEONLY AM_SHARE("tmmjprd_viewregs7")
+//  AM_RANGE(0x200700, 0x20070f) AM_WRITE(tmmjprd_blitter_w) AM_SHARE("tmmjprd_blitterregs")
+//  AM_RANGE(0x200800, 0x20080f) AM_WRITEONLY AM_SHARE("tmmjprd_viewregs9") // never changes?
 	AM_RANGE(0x200900, 0x2009ff) AM_DEVREADWRITE16("i5000snd", i5000snd_device, read, write, 0xffffffff)
 	/* hmm */
-//  AM_RANGE(0x279700, 0x279713) AM_WRITEONLY AM_BASE_LEGACY(&tmmjprd_viewregs10 )
+//  AM_RANGE(0x279700, 0x279713) AM_WRITEONLY AM_SHARE("tmmjprd_viewregs10")
 	/* tilemaps */
 	AM_RANGE(0x280000, 0x283fff) AM_READWRITE(tmmjprd_tilemap0_r,tmmjprd_tilemap0_w)
 	AM_RANGE(0x284000, 0x287fff) AM_READWRITE(tmmjprd_tilemap1_r,tmmjprd_tilemap1_w)
diff --git a/src/mame/includes/dc.h b/src/mame/includes/dc.h
index 001c1407615..c5b2e7e3be9 100644
--- a/src/mame/includes/dc.h
+++ b/src/mame/includes/dc.h
@@ -15,6 +15,7 @@ class dc_state : public driver_device
 		dc_framebuffer_ram(*this, "frameram"),
 		dc_texture_ram(*this, "dc_texture_ram"),
 		dc_sound_ram(*this, "dc_sound_ram"),
+		dc_ram(*this, "dc_ram"),
 		pvr2_texture_ram(*this, "textureram2"),
 		pvr2_framebuffer_ram(*this, "frameram2"),
 		elan_ram(*this, "elan_ram") { }
@@ -23,6 +24,7 @@ class dc_state : public driver_device
 	required_shared_ptr<UINT64> dc_texture_ram; // '64-bit access area'
 
 	required_shared_ptr<UINT32> dc_sound_ram;
+	required_shared_ptr<UINT64> dc_ram;
 
 	/* machine related */
 	UINT32 dc_rtcregister[4];
diff --git a/src/mame/includes/konamigx.h b/src/mame/includes/konamigx.h
index 5b85b83cc8c..91017dae6ea 100644
--- a/src/mame/includes/konamigx.h
+++ b/src/mame/includes/konamigx.h
@@ -8,7 +8,8 @@ public:
 		m_psacram(*this,"psacram"),
 		m_subpaletteram32(*this,"subpaletteram"),
 		m_k053936_0_ctrl(*this,"k053936_0_ctrl",32),
-		m_k053936_0_linectrl(*this,"k053936_0_line",32)
+		m_k053936_0_linectrl(*this,"k053936_0_line",32),
+		m_konamigx_type3_psac2_bank(*this,"psac2_bank")
 		{ }
 
 	required_device<cpu_device> m_maincpu;
@@ -17,6 +18,7 @@ public:
 	optional_shared_ptr<UINT32> m_subpaletteram32;
 	optional_shared_ptr<UINT16> m_k053936_0_ctrl;
 	optional_shared_ptr<UINT16> m_k053936_0_linectrl;
+	optional_shared_ptr<UINT32> m_konamigx_type3_psac2_bank;
 	DECLARE_WRITE32_MEMBER(esc_w);
 	DECLARE_WRITE32_MEMBER(eeprom_w);
 	DECLARE_WRITE32_MEMBER(control_w);
@@ -148,11 +150,7 @@ SCREEN_UPDATE_RGB32(konamigx);
 SCREEN_UPDATE_RGB32(konamigx_left);
 SCREEN_UPDATE_RGB32(konamigx_right);
 
-#ifdef UNUSED_FUNCTION
-#endif
-
 extern int konamigx_current_frame;
-extern UINT32* konamigx_type3_psac2_bank;
 
 
 /*----------- defined in machine/konamigx.c -----------*/
diff --git a/src/mame/includes/megadriv.h b/src/mame/includes/megadriv.h
index e8d1258932b..0e62083a6be 100644
--- a/src/mame/includes/megadriv.h
+++ b/src/mame/includes/megadriv.h
@@ -105,9 +105,11 @@ class md_base_state : public driver_device
 public:
 	md_base_state(const machine_config &mconfig, device_type type, const char *tag)
 	: driver_device(mconfig, type, tag),
-		m_vdp(*this,"gen_vdp")
+		m_vdp(*this,"gen_vdp"),
+		m_megadrive_ram(*this,"megadrive_ram")
 	{ }
 	required_device<sega_genesis_vdp_device> m_vdp;
+	optional_shared_ptr<UINT16> m_megadrive_ram;
 
 	DECLARE_DRIVER_INIT(megadriv_c2);
 	DECLARE_DRIVER_INIT(megadrie);
@@ -445,7 +447,10 @@ class segacd_state : public _32x_state	// use _32x_state as base to make easier
 {
 public:
 	segacd_state(const machine_config &mconfig, device_type type, const char *tag)
-	: _32x_state(mconfig, type, tag) { }
+	: _32x_state(mconfig, type, tag),
+	  m_font_bits(*this,"segacd_font") { }
+	
+	required_shared_ptr<UINT16> m_font_bits;
 };
 
 extern int sega_cd_connected;
diff --git a/src/mame/includes/namcos2.h b/src/mame/includes/namcos2.h
index b651874494a..f51eb7c0c01 100644
--- a/src/mame/includes/namcos2.h
+++ b/src/mame/includes/namcos2.h
@@ -188,6 +188,7 @@ public:
 		  m_dpram(*this, "dpram"),
 		  m_paletteram(*this, "paletteram"),
 		  m_spriteram(*this, "spriteram"),
+		  m_serial_comms_ram(*this, "serialram"),
 		  m_rozram(*this, "rozram"),
 		  m_roz_ctrl(*this, "rozctrl"),
 		  m_c45_road(*this, "c45_road")
@@ -250,6 +251,10 @@ public:
 	DECLARE_WRITE16_MEMBER( rozram_word_w );
 	DECLARE_READ16_MEMBER( gfx_ctrl_r );
 	DECLARE_WRITE16_MEMBER( gfx_ctrl_w );
+	DECLARE_READ16_MEMBER( serial_comms_ram_r );
+	DECLARE_WRITE16_MEMBER( serial_comms_ram_w );
+	DECLARE_READ16_MEMBER( serial_comms_ctrl_r );
+	DECLARE_WRITE16_MEMBER( serial_comms_ctrl_w );
 
 	void draw_sprite_init();
 	void update_palette();
@@ -264,10 +269,12 @@ public:
 	required_shared_ptr<UINT8> m_dpram;	/* 2Kx8 */
 	required_shared_ptr<UINT16> m_paletteram;
 	optional_shared_ptr<UINT16> m_spriteram;
+	optional_shared_ptr<UINT16> m_serial_comms_ram;
 	optional_shared_ptr<UINT16> m_rozram;
 	optional_shared_ptr<UINT16> m_roz_ctrl;
 	tilemap_t *m_tilemap_roz;
 	UINT16 m_gfx_ctrl;
+	UINT16 m_serial_comms_ctrl[0x8];
 
 	optional_device<namco_c45_road_device> m_c45_road;
 };
@@ -308,16 +315,6 @@ READ16_HANDLER( namcos2_68k_eeprom_r );
 /**************************************************************/
 READ16_HANDLER( namcos2_68k_data_rom_r );
 
-/**************************************************************/
-/* Shared serial communications processory (CPU5 ????)        */
-/**************************************************************/
-READ16_HANDLER( namcos2_68k_serial_comms_ram_r );
-WRITE16_HANDLER( namcos2_68k_serial_comms_ram_w );
-READ16_HANDLER( namcos2_68k_serial_comms_ctrl_r );
-WRITE16_HANDLER( namcos2_68k_serial_comms_ctrl_w );
-
-extern UINT16 *namcos2_68k_serial_comms_ram;
-
 /**************************************************************/
 /* Shared protection/random number generator                  */
 /**************************************************************/
diff --git a/src/mame/includes/naomi.h b/src/mame/includes/naomi.h
index 1221e83de2e..bdba9910b8e 100644
--- a/src/mame/includes/naomi.h
+++ b/src/mame/includes/naomi.h
@@ -25,8 +25,6 @@ extern void naomi_game_decrypt(running_machine& machine, UINT64 key, UINT8* regi
 
 
 
-extern UINT64 *naomi_ram64;
-
 extern int jvsboard_type;
 extern UINT16 actel_id;
 
diff --git a/src/mame/includes/neogeo.h b/src/mame/includes/neogeo.h
index e6ab8b281a5..f8d58fab082 100644
--- a/src/mame/includes/neogeo.h
+++ b/src/mame/includes/neogeo.h
@@ -36,11 +36,12 @@ class neogeo_state : public driver_device
 {
 public:
 	neogeo_state(const machine_config &mconfig, device_type type, const char *tag)
-		: driver_device(mconfig, type, tag) { }
+		: driver_device(mconfig, type, tag),
+		  m_save_ram(*this, "save_ram") { }
 
 	/* memory pointers */
 //  UINT8      *memcard_data;   // this currently uses generic handlers
-//  UINT16     *save_ram;       // this currently uses generic handlers
+	required_shared_ptr<UINT16> m_save_ram;       // this currently uses generic handlers
 
 	/* video-related */
 	UINT8      *m_sprite_gfx;
diff --git a/src/mame/includes/pgm.h b/src/mame/includes/pgm.h
index 21869d7be40..045640a0be1 100644
--- a/src/mame/includes/pgm.h
+++ b/src/mame/includes/pgm.h
@@ -16,7 +16,8 @@ public:
 		: driver_device(mconfig, type, tag),
 		  m_videoregs(*this, "videoregs"),
 		  m_videoram(*this, "videoram"),
-		  m_z80_mainram(*this, "z80_mainram")
+		  m_z80_mainram(*this, "z80_mainram"),
+		  m_mainram(*this, "sram")
 		{
 			m_irq4_disabled = 0;
 		}
@@ -25,7 +26,7 @@ public:
 	required_shared_ptr<UINT16> m_videoregs;
 	required_shared_ptr<UINT16> m_videoram;
 	required_shared_ptr<UINT8> m_z80_mainram;
-//  UINT16 *      m_mainram;  // currently this is also used by nvram handler
+	required_shared_ptr<UINT16> m_mainram;
 	UINT16 *      m_bg_videoram;
 	UINT16 *      m_tx_videoram;
 	UINT16 *      m_rowscrollram;
@@ -299,8 +300,6 @@ public:
 
 
 
-extern UINT16 *pgm_mainram;	// used by nvram handler, we cannot move it to driver data struct
-
 /*----------- defined in drivers/pgm.c -----------*/
 
 void pgm_basic_init( running_machine &machine, bool set_bank  = true );
diff --git a/src/mame/machine/megacd.c b/src/mame/machine/megacd.c
index be84b868747..703395e7e77 100644
--- a/src/mame/machine/megacd.c
+++ b/src/mame/machine/megacd.c
@@ -2235,7 +2235,13 @@ READ16_HANDLER( segacd_stopwatch_timer_r )
 void segacd_init_main_cpu( running_machine& machine )
 {
 	address_space* space = machine.device("maincpu")->memory().space(AS_PROGRAM);
-
+	
+	segacd_font_bits = reinterpret_cast<UINT16 *>(machine.root_device().memshare("segacd_font")->ptr());
+	segacd_backupram = reinterpret_cast<UINT16 *>(machine.root_device().memshare("backupram")->ptr());
+	segacd_dataram = reinterpret_cast<UINT16 *>(machine.root_device().memshare("dataram")->ptr());
+	segacd_dataram2 = reinterpret_cast<UINT16 *>(machine.root_device().memshare("dataram2")->ptr());
+	segacd_4meg_prgram = reinterpret_cast<UINT16 *>(machine.root_device().memshare("segacd_program")->ptr());
+	
 	segacd_4meg_prgbank = 0;
 
 
@@ -3008,12 +3014,12 @@ READ16_HANDLER( segacd_font_converted_r )
 }
 
 ADDRESS_MAP_START( segacd_map, AS_PROGRAM, 16, driver_device )
-	AM_RANGE(0x000000, 0x07ffff) AM_RAM AM_BASE_LEGACY(&segacd_4meg_prgram)
+	AM_RANGE(0x000000, 0x07ffff) AM_RAM AM_SHARE("segacd_program")
 
-	AM_RANGE(0x080000, 0x0bffff) AM_READWRITE_LEGACY(segacd_sub_dataram_part1_r, segacd_sub_dataram_part1_w) AM_BASE_LEGACY(&segacd_dataram)
-	AM_RANGE(0x0c0000, 0x0dffff) AM_READWRITE_LEGACY(segacd_sub_dataram_part2_r, segacd_sub_dataram_part2_w) AM_BASE_LEGACY(&segacd_dataram2)
+	AM_RANGE(0x080000, 0x0bffff) AM_READWRITE_LEGACY(segacd_sub_dataram_part1_r, segacd_sub_dataram_part1_w) AM_SHARE("dataram")
+	AM_RANGE(0x0c0000, 0x0dffff) AM_READWRITE_LEGACY(segacd_sub_dataram_part2_r, segacd_sub_dataram_part2_w) AM_SHARE("dataram2")
 
-	AM_RANGE(0xfe0000, 0xfe3fff) AM_READWRITE_LEGACY(segacd_backupram_r,segacd_backupram_w) AM_SHARE("backupram") AM_BASE_LEGACY(&segacd_backupram)// backup RAM, odd bytes only!
+	AM_RANGE(0xfe0000, 0xfe3fff) AM_READWRITE_LEGACY(segacd_backupram_r,segacd_backupram_w) AM_SHARE("backupram") // backup RAM, odd bytes only!
 
 	AM_RANGE(0xff0000, 0xff001f) AM_DEVWRITE8_LEGACY("rfsnd", rf5c68_w, 0x00ff)  // PCM, RF5C164
 	AM_RANGE(0xff0020, 0xff003f) AM_DEVREAD8_LEGACY("rfsnd", rf5c68_r, 0x00ff)
@@ -3038,7 +3044,7 @@ ADDRESS_MAP_START( segacd_map, AS_PROGRAM, 16, driver_device )
 	AM_RANGE(0xff8038, 0xff8041) AM_READ8_LEGACY(segacd_cdd_rx_r,0xffff)
 	AM_RANGE(0xff8042, 0xff804b) AM_WRITE8_LEGACY(segacd_cdd_tx_w,0xffff)
 	AM_RANGE(0xff804c, 0xff804d) AM_READWRITE_LEGACY(segacd_font_color_r, segacd_font_color_w)
-	AM_RANGE(0xff804e, 0xff804f) AM_RAM AM_BASE_LEGACY(&segacd_font_bits)
+	AM_RANGE(0xff804e, 0xff804f) AM_RAM AM_SHARE("segacd_font")
 	AM_RANGE(0xff8050, 0xff8057) AM_READ_LEGACY(segacd_font_converted_r)
 	AM_RANGE(0xff8058, 0xff8059) AM_READWRITE_LEGACY(segacd_stampsize_r, segacd_stampsize_w) // Stamp size
 	AM_RANGE(0xff805a, 0xff805b) AM_READWRITE_LEGACY(segacd_stampmap_base_address_r, segacd_stampmap_base_address_w) // Stamp map base address
diff --git a/src/mame/machine/megadriv.c b/src/mame/machine/megadriv.c
index e32a8edddd5..6f54cd7be10 100644
--- a/src/mame/machine/megadriv.c
+++ b/src/mame/machine/megadriv.c
@@ -56,7 +56,6 @@ static cpu_device *_genesis_snd_z80_cpu;
 int genesis_other_hacks = 0; // misc hacks
 
 timer_device* megadriv_scanline_timer;
-UINT16* megadrive_ram = NULL;
 
 struct genesis_z80_vars
 {
@@ -577,14 +576,14 @@ static ADDRESS_MAP_START( megadriv_map, AS_PROGRAM, 16, driver_device )
 	AM_RANGE(0xa11200, 0xa11201) AM_WRITE_LEGACY(megadriv_68k_req_z80_reset)
 
 	/* these are fake - remove allocs in VIDEO_START to use these to view ram instead */
-//  AM_RANGE(0xb00000, 0xb0ffff) AM_RAM AM_BASE_LEGACY(&megadrive_vdp_vram)
-//  AM_RANGE(0xb10000, 0xb1007f) AM_RAM AM_BASE_LEGACY(&megadrive_vdp_vsram)
-//  AM_RANGE(0xb10100, 0xb1017f) AM_RAM AM_BASE_LEGACY(&megadrive_vdp_cram)
+//  AM_RANGE(0xb00000, 0xb0ffff) AM_RAM AM_SHARE("megadrive_vdp_vram")
+//  AM_RANGE(0xb10000, 0xb1007f) AM_RAM AM_SHARE("megadrive_vdp_vsram")
+//  AM_RANGE(0xb10100, 0xb1017f) AM_RAM AM_SHARE("megadrive_vdp_cram")
 
 	AM_RANGE(0xc00000, 0xc0001f) AM_DEVREADWRITE("gen_vdp", sega_genesis_vdp_device, megadriv_vdp_r,megadriv_vdp_w)
 	AM_RANGE(0xd00000, 0xd0001f) AM_DEVREADWRITE("gen_vdp", sega_genesis_vdp_device, megadriv_vdp_r,megadriv_vdp_w) // the earth defend
 
-	AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) AM_BASE_LEGACY(&megadrive_ram)
+	AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) AM_SHARE("megadrive_ram")
 //  AM_RANGE(0xff0000, 0xffffff) AM_READONLY
 	/*       0xe00000 - 0xffffff) == MAIN RAM (64kb, Mirrored, most games use ff0000 - ffffff) */
 ADDRESS_MAP_END
@@ -883,7 +882,7 @@ static ADDRESS_MAP_START( md_bootleg_map, AS_PROGRAM, 16, driver_device )
 	AM_RANGE(0xc00000, 0xc0001f) AM_DEVREADWRITE("gen_vdp", sega_genesis_vdp_device, megadriv_vdp_r,megadriv_vdp_w)
 	AM_RANGE(0xd00000, 0xd0001f) AM_DEVREADWRITE("gen_vdp", sega_genesis_vdp_device, megadriv_vdp_r,megadriv_vdp_w)
 
-	AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) AM_BASE_LEGACY(&megadrive_ram)
+	AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) AM_SHARE("megadrive_ram")
 ADDRESS_MAP_END
 
 MACHINE_CONFIG_DERIVED( md_bootleg, megadriv )
@@ -1008,8 +1007,8 @@ MACHINE_RESET( megadriv )
 	{
 	//  set_refresh_rate(megadriv_framerate);
 	//  machine.device("maincpu")->set_clock_scale(0.9950f); /* Fatal Rewind is very fussy... (and doesn't work now anyway, so don't bother with this) */
-		if (megadrive_ram)
-			memset(megadrive_ram,0x00,0x10000);
+		if (state->m_megadrive_ram)
+			memset(state->m_megadrive_ram,0x00,0x10000);
 	}
 
 	megadriv_reset_vdp(machine);
diff --git a/src/mame/machine/n64.c b/src/mame/machine/n64.c
index 5ea6201b07b..65c9e43229d 100644
--- a/src/mame/machine/n64.c
+++ b/src/mame/machine/n64.c
@@ -2404,6 +2404,12 @@ static void n64_machine_stop(running_machine &machine)
 
 MACHINE_START( n64 )
 {
+	n64_state *state = machine.driver_data<n64_state>();
+	rdram = reinterpret_cast<UINT32 *>(state->memshare("rdram")->ptr());
+	n64_sram = reinterpret_cast<UINT32 *>(state->memshare("sram")->ptr());
+	rsp_imem = reinterpret_cast<UINT32 *>(state->memshare("rsp_imem")->ptr());
+	rsp_dmem = reinterpret_cast<UINT32 *>(state->memshare("rsp_dmem")->ptr());
+
 	mips3drc_set_options(machine.device("maincpu"), MIPS3DRC_COMPATIBLE_OPTIONS);
 
 	/* configure fast RAM regions for DRC */
diff --git a/src/mame/machine/namcos2.c b/src/mame/machine/namcos2.c
index 73a834e28e1..8c269ded968 100644
--- a/src/mame/machine/namcos2.c
+++ b/src/mame/machine/namcos2.c
@@ -164,20 +164,17 @@ READ16_HANDLER( namcos2_68k_data_rom_r ){
 /* 68000 Shared serial communications processor (CPU5?)       */
 /**************************************************************/
 
-static UINT16  namcos2_68k_serial_comms_ctrl[0x8];
-UINT16 *namcos2_68k_serial_comms_ram;
-
-READ16_HANDLER( namcos2_68k_serial_comms_ram_r ){
-	return namcos2_68k_serial_comms_ram[offset];
+READ16_MEMBER( namcos2_state::serial_comms_ram_r ){
+	return m_serial_comms_ram[offset];
 }
 
-WRITE16_HANDLER( namcos2_68k_serial_comms_ram_w ){
-	COMBINE_DATA( &namcos2_68k_serial_comms_ram[offset] );
+WRITE16_MEMBER( namcos2_state::serial_comms_ram_w ){
+	COMBINE_DATA( &m_serial_comms_ram[offset] );
 }
 
-READ16_HANDLER( namcos2_68k_serial_comms_ctrl_r )
+READ16_MEMBER( namcos2_state::serial_comms_ctrl_r )
 {
-	UINT16 retval = namcos2_68k_serial_comms_ctrl[offset];
+	UINT16 retval = m_serial_comms_ctrl[offset];
 
 	switch(offset){
 	case 0x00:
@@ -190,9 +187,9 @@ READ16_HANDLER( namcos2_68k_serial_comms_ctrl_r )
 	return retval;
 }
 
-WRITE16_HANDLER( namcos2_68k_serial_comms_ctrl_w )
+WRITE16_MEMBER( namcos2_state::serial_comms_ctrl_w )
 {
-	COMBINE_DATA( &namcos2_68k_serial_comms_ctrl[offset] );
+	COMBINE_DATA( &m_serial_comms_ctrl[offset] );
 }
 
 /*************************************************************/
diff --git a/src/mame/machine/naomi.c b/src/mame/machine/naomi.c
index 0c5abd92500..eb1c5d5d0ae 100644
--- a/src/mame/machine/naomi.c
+++ b/src/mame/machine/naomi.c
@@ -22,7 +22,6 @@ hotd2o: bp 0xc0ba1f6, modify work RAM 0xc9c35a8 to be zero, bpclear
 #include "includes/naomi.h"
 #include "includes/dc.h"
 
-UINT64 *naomi_ram64;
 int jvsboard_type;
 UINT16 actel_id;
 
@@ -34,7 +33,7 @@ static READ64_HANDLER( naomi_biose_idle_skip_r )
 //  else
 //      printf("%08x\n", space->device().safe_pc());
 
-	return naomi_ram64[0x2ad238/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x2ad238/8];
 }
 
 static READ64_HANDLER( naomi_biosh_idle_skip_r )
@@ -44,7 +43,7 @@ static READ64_HANDLER( naomi_biosh_idle_skip_r )
 
 //   printf("%08x\n", space->device().safe_pc());
 
-	return naomi_ram64[0x2b0600/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x2b0600/8];
 }
 
 static READ64_HANDLER( naomi2_biose_idle_skip_r )
@@ -55,7 +54,7 @@ static READ64_HANDLER( naomi2_biose_idle_skip_r )
 //  else
 //      printf("%08x\n", space->device().safe_pc());
 
-	return naomi_ram64[0x2b0600/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x2b0600/8];
 }
 
 static UINT8 asciihex_to_dec(UINT8 in)
@@ -246,7 +245,7 @@ static READ64_HANDLER( naomigd_ggxxsla_idle_skip_r )
 	if (space->device().safe_pc()==0x0c0c9adc)
 		space->device().execute().spin_until_time(attotime::from_usec(500));
 
-	return naomi_ram64[0x1aae18/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x1aae18/8];
 }
 
 DRIVER_INIT_MEMBER(dc_state,ggxxsla)
@@ -260,7 +259,7 @@ static READ64_HANDLER( naomigd_ggxx_idle_skip_r )
 	if (space->device().safe_pc()==0xc0b5c3c) // or 0xc0bab0c
 		space->device().execute().spin_until_time(attotime::from_usec(500));
 
-	return naomi_ram64[0x1837b8/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x1837b8/8];
 }
 
 
@@ -277,7 +276,7 @@ static READ64_HANDLER( naomigd_ggxxrl_idle_skip_r )
 
 	//printf("%08x\n", space->device().safe_pc());
 
-	return naomi_ram64[0x18d6c8/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x18d6c8/8];
 }
 
 DRIVER_INIT_MEMBER(dc_state,ggxxrl)
@@ -292,7 +291,7 @@ static READ64_HANDLER( naomigd_sfz3ugd_idle_skip_r )
 	if (space->device().safe_pc()==0xc36a2dc)
 		space->device().execute().spin_until_time(attotime::from_usec(500));
 
-	return naomi_ram64[0x5dc900/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x5dc900/8];
 }
 
 DRIVER_INIT_MEMBER(dc_state,sfz3ugd)
@@ -340,7 +339,7 @@ static READ64_HANDLER( hotd2_idle_skip_r )
 //  else
 //  printf("%08x\n", space->device().safe_pc());
 
-	return naomi_ram64[0xa25fb8/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0xa25fb8/8];
 }
 
 DRIVER_INIT_MEMBER(dc_state,hotd2)
diff --git a/src/mame/machine/pgmprot2.c b/src/mame/machine/pgmprot2.c
index 01f37cb8c0d..1d1b66e66a7 100644
--- a/src/mame/machine/pgmprot2.c
+++ b/src/mame/machine/pgmprot2.c
@@ -280,8 +280,8 @@ static READ32_HANDLER( ddp2_speedup_r )
 
 static READ16_HANDLER( ddp2_main_speedup_r )
 {
-
-	UINT16 data = pgm_mainram[0x0ee54/2];
+	pgm_state *state = space->machine().driver_data<pgm_state>();
+	UINT16 data = state->m_mainram[0x0ee54/2];
 	int pc = space->device().safe_pc();
 
 	if (pc == 0x149dce) space->device().execute().spin_until_interrupt();
diff --git a/src/mame/machine/pgmprot3.c b/src/mame/machine/pgmprot3.c
index 7f96592dbc4..a7b422636f6 100644
--- a/src/mame/machine/pgmprot3.c
+++ b/src/mame/machine/pgmprot3.c
@@ -277,7 +277,8 @@ static READ32_HANDLER( dmnfrnt_speedup_r )
 
 static READ16_HANDLER( dmnfrnt_main_speedup_r )
 {
-	UINT16 data = pgm_mainram[0xa03c/2];
+	pgm_state *state = space->machine().driver_data<pgm_state>();
+	UINT16 data = state->m_mainram[0xa03c/2];
 	int pc = space->device().safe_pc();
 	if (pc == 0x10193a) space->device().execute().spin_until_interrupt();
 	else if (pc == 0x1019a4) space->device().execute().spin_until_interrupt();
diff --git a/src/mame/machine/pgmprot5.c b/src/mame/machine/pgmprot5.c
index 9385032dd99..deae479984a 100644
--- a/src/mame/machine/pgmprot5.c
+++ b/src/mame/machine/pgmprot5.c
@@ -32,7 +32,8 @@ READ16_HANDLER( dw2_d80000_r )
 // if(dw2reg<0x20) //NOT SURE!!
 	{
 		//The value at 0x80EECE is computed in the routine at 0x107c18
-		UINT16 d = pgm_mainram[0xEECE/2];
+		pgm_state *state = space->machine().driver_data<pgm_state>();
+		UINT16 d = state->m_mainram[0xEECE/2];
 		UINT16 d2 = 0;
 		d = (d >> 8) | (d << 8);
 		DW2BITSWAP(d, d2, 7,  0);
diff --git a/src/mame/machine/pgmprot6.c b/src/mame/machine/pgmprot6.c
index 844a767702e..29e975b7957 100644
--- a/src/mame/machine/pgmprot6.c
+++ b/src/mame/machine/pgmprot6.c
@@ -185,10 +185,11 @@ static WRITE16_HANDLER( olds_w )
 
 static READ16_HANDLER( olds_prot_swap_r )
 {
+	pgm_state *state = space->machine().driver_data<pgm_state>();
 	if (space->device().safe_pc() < 0x100000)		//bios
-		return pgm_mainram[0x178f4 / 2];
+		return state->m_mainram[0x178f4 / 2];
 	else						//game
-		return pgm_mainram[0x178d8 / 2];
+		return state->m_mainram[0x178d8 / 2];
 
 }
 
diff --git a/src/mame/video/konamigx.c b/src/mame/video/konamigx.c
index ffb04520e29..55179cc67d0 100644
--- a/src/mame/video/konamigx.c
+++ b/src/mame/video/konamigx.c
@@ -1839,7 +1839,6 @@ TILE_GET_INFO_MEMBER(konamigx_state::get_gx_psac_tile_info)
 	SET_TILE_INFO_MEMBER(0, tileno, colour, TILE_FLIPYX(flip));
 }
 
-UINT32* konamigx_type3_psac2_bank;
 static int konamigx_type3_psac2_actual_bank;
 //int konamigx_type3_psac2_actual_last_bank = 0;
 
@@ -1847,8 +1846,8 @@ WRITE32_MEMBER(konamigx_state::konamigx_type3_psac2_bank_w)
 {
 	// other bits are used for something...
 
-	COMBINE_DATA(&konamigx_type3_psac2_bank[offset]);
-	konamigx_type3_psac2_actual_bank = (konamigx_type3_psac2_bank[0] & 0x10000000) >> 28;
+	COMBINE_DATA(&m_konamigx_type3_psac2_bank[offset]);
+	konamigx_type3_psac2_actual_bank = (m_konamigx_type3_psac2_bank[0] & 0x10000000) >> 28;
 
 	/* handle this by creating 2 roz tilemaps instead, otherwise performance dies completely on dual screen mode
     if (konamigx_type3_psac2_actual_bank!=konamigx_type3_psac2_actual_last_bank)
diff --git a/src/mame/video/pgm.c b/src/mame/video/pgm.c
index e4bc40c77a8..8fed628e7b3 100644
--- a/src/mame/video/pgm.c
+++ b/src/mame/video/pgm.c
@@ -676,6 +676,6 @@ SCREEN_VBLANK( pgm )
 		pgm_state *state = screen.machine().driver_data<pgm_state>();
 
 		/* first 0xa00 of main ram = sprites, seems to be buffered, DMA? */
-		memcpy(state->m_spritebufferram, pgm_mainram, 0xa00);
+		memcpy(state->m_spritebufferram, state->m_mainram, 0xa00);
 	}
 }
diff --git a/src/mess/drivers/dc.c b/src/mess/drivers/dc.c
index 5f1a6d2872a..d878184e981 100644
--- a/src/mess/drivers/dc.c
+++ b/src/mess/drivers/dc.c
@@ -40,15 +40,13 @@ extern WRITE64_HANDLER( dc_mess_gdrom_w );
 extern READ64_HANDLER( dc_mess_g1_ctrl_r );
 extern WRITE64_HANDLER( dc_mess_g1_ctrl_w );
 
-static UINT64 *dc_ram;
-
 static READ64_HANDLER( dcus_idle_skip_r )
 {
 	if (space->device().safe_pc()==0xc0ba52a)
 		space->device().execute().spin_until_time(attotime::from_usec(2500));
 	//  device_spinuntil_int(&space->device());
 
-	return dc_ram[0x2303b0/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x2303b0/8];
 }
 
 static READ64_HANDLER( dcjp_idle_skip_r )
@@ -57,7 +55,7 @@ static READ64_HANDLER( dcjp_idle_skip_r )
 		space->device().execute().spin_until_time(attotime::from_usec(2500));
 	//  device_spinuntil_int(&space->device());
 
-	return dc_ram[0x2302f8/8];
+	return space->machine().driver_data<dc_state>()->dc_ram[0x2302f8/8];
 }
 
 DRIVER_INIT_MEMBER(dc_state,dc)
@@ -179,10 +177,10 @@ static ADDRESS_MAP_START( dc_map, AS_PROGRAM, 64, dc_state )
 	AM_RANGE(0x05000000, 0x05ffffff) AM_RAM AM_SHARE("frameram") // apparently this actually accesses the same memory as the 64-bit texture memory access, but in a different format, keep it apart for now
 
 	/* Area 3 */
-	AM_RANGE(0x0c000000, 0x0cffffff) AM_RAM AM_SHARE("share4") AM_BASE_LEGACY(&dc_ram)
-	AM_RANGE(0x0d000000, 0x0dffffff) AM_RAM AM_SHARE("share4")// extra ram on Naomi (mirror on DC)
-	AM_RANGE(0x0e000000, 0x0effffff) AM_RAM AM_SHARE("share4")// mirror
-	AM_RANGE(0x0f000000, 0x0fffffff) AM_RAM AM_SHARE("share4")// mirror
+	AM_RANGE(0x0c000000, 0x0cffffff) AM_RAM AM_SHARE("dc_ram")
+	AM_RANGE(0x0d000000, 0x0dffffff) AM_RAM AM_SHARE("dc_ram")// extra ram on Naomi (mirror on DC)
+	AM_RANGE(0x0e000000, 0x0effffff) AM_RAM AM_SHARE("dc_ram")// mirror
+	AM_RANGE(0x0f000000, 0x0fffffff) AM_RAM AM_SHARE("dc_ram")// mirror
 
 	/* Area 4 */
 	AM_RANGE(0x10000000, 0x107fffff) AM_WRITE_LEGACY(ta_fifo_poly_w )
@@ -193,7 +191,7 @@ static ADDRESS_MAP_START( dc_map, AS_PROGRAM, 64, dc_state )
 	AM_RANGE(0x12800000, 0x12ffffff) AM_WRITE_LEGACY(ta_fifo_yuv_w )
 	AM_RANGE(0x13000000, 0x137fffff) AM_WRITE_LEGACY(ta_texture_directpath1_w ) AM_MIRROR(0x00800000) // access to texture / fraembfufer memory (either 32-bit or 64-bit area depending on SB_LMMODE1 register - cannot be written directly, only through dma / store queue
 
-	AM_RANGE(0x8c000000, 0x8cffffff) AM_RAM AM_SHARE("share4")	// another RAM mirror
+	AM_RANGE(0x8c000000, 0x8cffffff) AM_RAM AM_SHARE("dc_ram")	// another RAM mirror
 
 	AM_RANGE(0xa0000000, 0xa01fffff) AM_ROM AM_REGION("maincpu", 0)
 ADDRESS_MAP_END
diff --git a/src/mess/drivers/n64.c b/src/mess/drivers/n64.c
index 31484333508..0d157546f38 100644
--- a/src/mess/drivers/n64.c
+++ b/src/mess/drivers/n64.c
@@ -20,7 +20,7 @@ static READ32_HANDLER( dd_null_r )
 }
 
 static ADDRESS_MAP_START( n64_map, AS_PROGRAM, 32, n64_state )
-	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	AM_BASE_LEGACY(&rdram)				// RDRAM
+	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	AM_SHARE("rdram")					// RDRAM
 	AM_RANGE(0x03f00000, 0x03f00027) AM_DEVREADWRITE("rcp", n64_periphs, rdram_reg_r, rdram_reg_w)
 	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("dmem")					// RSP DMEM
 	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("imem")					// RSP IMEM
@@ -33,14 +33,14 @@ static ADDRESS_MAP_START( n64_map, AS_PROGRAM, 32, n64_state )
 	AM_RANGE(0x04700000, 0x047fffff) AM_DEVREADWRITE("rcp", n64_periphs, ri_reg_r, ri_reg_w)	// RDRAM Interface
 	AM_RANGE(0x04800000, 0x048fffff) AM_DEVREADWRITE("rcp", n64_periphs, si_reg_r, si_reg_w)	// Serial Interface
 	AM_RANGE(0x05000508, 0x0500050b) AM_READ_LEGACY(dd_null_r);
-	AM_RANGE(0x08000000, 0x0801ffff) AM_RAM AM_BASE_LEGACY(&n64_sram)										// Cartridge SRAM
+	AM_RANGE(0x08000000, 0x0801ffff) AM_RAM AM_SHARE("sram")										// Cartridge SRAM
 	AM_RANGE(0x10000000, 0x13ffffff) AM_ROM AM_REGION("user2", 0)									// Cartridge
 	AM_RANGE(0x1fc00000, 0x1fc007bf) AM_ROM AM_REGION("user1", 0)									// PIF ROM
 	AM_RANGE(0x1fc007c0, 0x1fc007ff) AM_DEVREADWRITE("rcp", n64_periphs, pif_ram_r, pif_ram_w)
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( n64dd_map, AS_PROGRAM, 32, n64_state )
-	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	AM_BASE_LEGACY(&rdram)				// RDRAM
+	AM_RANGE(0x00000000, 0x007fffff) AM_RAM	AM_SHARE("rdram")				// RDRAM
 	AM_RANGE(0x03f00000, 0x03f00027) AM_DEVREADWRITE("rcp", n64_periphs, rdram_reg_r, rdram_reg_w)
 	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("dmem")					// RSP DMEM
 	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("imem")					// RSP IMEM
@@ -54,7 +54,7 @@ static ADDRESS_MAP_START( n64dd_map, AS_PROGRAM, 32, n64_state )
 	AM_RANGE(0x04800000, 0x048fffff) AM_DEVREADWRITE("rcp", n64_periphs, si_reg_r, si_reg_w)	// Serial Interface
 	AM_RANGE(0x05000000, 0x05ffffff) AM_DEVREADWRITE("rcp", n64_periphs, dd_reg_r, dd_reg_w) // 64DD Interface
 	AM_RANGE(0x06000000, 0x063fffff) AM_ROM AM_REGION("ddipl", 0)									// 64DD IPL ROM
-	AM_RANGE(0x08000000, 0x0801ffff) AM_RAM AM_BASE_LEGACY(&n64_sram)										// Cartridge SRAM
+	AM_RANGE(0x08000000, 0x0801ffff) AM_RAM AM_SHARE("sram")										// Cartridge SRAM
 	AM_RANGE(0x10000000, 0x13ffffff) AM_ROM AM_REGION("user2", 0)									// Cartridge
 	AM_RANGE(0x1fc00000, 0x1fc007bf) AM_ROM AM_REGION("user1", 0)									// PIF ROM
 	AM_RANGE(0x1fc007c0, 0x1fc007ff) AM_DEVREADWRITE("rcp", n64_periphs, pif_ram_r, pif_ram_w)
@@ -63,8 +63,8 @@ ADDRESS_MAP_END
 static ADDRESS_MAP_START( rsp_map, AS_PROGRAM, 32, n64_state )
 	AM_RANGE(0x00000000, 0x00000fff) AM_RAM AM_SHARE("dmem")
 	AM_RANGE(0x00001000, 0x00001fff) AM_RAM AM_SHARE("imem")
-	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_BASE_LEGACY(&rsp_dmem) AM_SHARE("dmem")
-	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_BASE_LEGACY(&rsp_imem) AM_SHARE("imem")
+	AM_RANGE(0x04000000, 0x04000fff) AM_RAM AM_SHARE("rsp_dmem") AM_SHARE("dmem")
+	AM_RANGE(0x04001000, 0x04001fff) AM_RAM AM_SHARE("rsp_imem") AM_SHARE("imem")
 ADDRESS_MAP_END
 
 static INPUT_PORTS_START( n64 )
diff --git a/src/mess/drivers/ng_aes.c b/src/mess/drivers/ng_aes.c
index a4fe6701718..a1b4a685c2d 100644
--- a/src/mess/drivers/ng_aes.c
+++ b/src/mess/drivers/ng_aes.c
@@ -110,7 +110,7 @@ public:
 
 //static UINT16 *save_ram;
 
-UINT16* neocd_work_ram;
+//UINT16* neocd_work_ram;
 
 /*************************************
  *
@@ -1310,7 +1310,7 @@ ADDRESS_MAP_END
 static ADDRESS_MAP_START( neocd_main_map, AS_PROGRAM, 16, ng_aes_state )
 	AM_RANGE(0x000000, 0x00007f) AM_RAMBANK(NEOGEO_BANK_VECTORS)
 	AM_RANGE(0x000080, 0x0fffff) AM_RAM
-	AM_RANGE(0x100000, 0x10ffff) AM_MIRROR(0x0f0000) AM_RAM AM_BASE_LEGACY(&neocd_work_ram)
+	AM_RANGE(0x100000, 0x10ffff) AM_MIRROR(0x0f0000) AM_RAM AM_SHARE("neocd_work_ram")
 	/* some games have protection devices in the 0x200000 region, it appears to map to cart space, not surprising, the ROM is read here too */
 	AM_RANGE(0x200000, 0x2fffff) AM_ROMBANK(NEOGEO_BANK_CARTRIDGE)
 	AM_RANGE(0x2ffff0, 0x2fffff) AM_WRITE(main_cpu_bank_select_w)