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diff --git a/src/mame/drivers/20pacgal.c b/src/mame/drivers/20pacgal.c
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+++ b/src/mame/drivers/20pacgal.c
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+/***************************************************************************
+
+Ms.Pac-Man/Galaga - 20 Year Reunion
+
+driver by Nicola Salmoria
+
+Notes:
+- There are four start buttons: the first two are for Ms. Pac-Man, the other two
+ for Galaga.
+
+- To play Pac-Man instead of Ms. Pac-Man, insert coins then enter the following
+ sequence: U U U D D D L R L R L. A sound will play and the ghost will change
+ from red to pink.
+
+- Writes to the Z180 ASCI port:
+ MS PAC-MAN/GALAGA
+ arcade video system
+ version 1.01
+ (c) 2000 Cosmodog, Ltd.
+ >
+ and it listens for incoming characters.
+
+
+TODO:
+- Starfield.
+
+- Convert to tilemaps & optimize video rendering, I was just too lazy to do it for now.
+
+- Check the ASCI interface, there probably is fully working debug code.
+
+- The timed interrupt is a kludge; it is supposed to be generated internally by
+ the Z180, but the cpu core doesn't support that yet.
+
+- Correct CPU speed... Zilog says Z180 comes in 6, 8, 10, 20 & 33MHz.
+ 20MHz is used as it "seems" right based on the music in Galaga
+
+***************************************************************************/
+
+#include "driver.h"
+#include "machine/eeprom.h"
+#include "cpu/z180/z180.h"
+#include "pacman.h"
+#include "sound/namco.h"
+#include "sound/dac.h"
+
+extern UINT8 *pacgal_charram,*pacgal_sprram;
+extern UINT8 *pacgal_videoram,*pacgal_videoram2;
+PALETTE_INIT( 20pacgal );
+VIDEO_START( 20pacgal );
+WRITE8_HANDLER( pacgal_lookup_w );
+WRITE8_HANDLER( pacgal_active_game_w );
+WRITE8_HANDLER( pacgal_videoram2_w );
+WRITE8_HANDLER( pacgal_charram_w );
+WRITE8_HANDLER( pacgal_sprram_w );
+VIDEO_UPDATE( 20pacgal );
+
+
+
+static struct EEPROM_interface eeprom_interface =
+{
+ 7, /* address bits */
+ 8, /* data bits */
+ "*110", /* read command */
+ "*101", /* write command */
+ 0, /* erase command */
+ "*10000xxxxx", /* lock command */
+ "*10011xxxxx", /* unlock command */
+};
+
+static NVRAM_HANDLER( eeprom )
+{
+ if (read_or_write)
+ EEPROM_save(file);
+ else
+ {
+ EEPROM_init(&eeprom_interface);
+
+ if (file)
+ EEPROM_load(file);
+ }
+}
+
+static READ8_HANDLER( eeprom_r )
+{
+ int res;
+
+ /* bit 7 is EEPROM data */
+ res = EEPROM_read_bit() << 7;
+ return res;
+}
+
+static WRITE8_HANDLER( eeprom_w )
+{
+ /* bit 7 is data */
+ /* bit 6 is clock (active high) */
+ /* bit 5 is cs (active low) */
+ EEPROM_write_bit(data & 0x80);
+ EEPROM_set_cs_line((data & 0x20) ? CLEAR_LINE : ASSERT_LINE);
+ EEPROM_set_clock_line((data & 0x40) ? ASSERT_LINE : CLEAR_LINE);
+}
+
+static WRITE8_HANDLER( irqack_w )
+{
+ int bit = data & 1;
+ cpu_interrupt_enable(0,bit);
+ if (!bit)
+ cpunum_set_input_line( 0, 0, CLEAR_LINE );
+}
+
+static WRITE8_HANDLER( flipscreen_w )
+{
+ flip_screen_set(data & 1);
+}
+
+static WRITE8_HANDLER( pacgal_dac_w )
+{
+ DAC_signed_data_w(0, data);
+}
+
+static WRITE8_HANDLER( coin_w )
+{
+ coin_counter_w(0,data & 1);
+}
+
+
+
+static ADDRESS_MAP_START( 20pacgal_map, ADDRESS_SPACE_PROGRAM, 8 )
+ AM_RANGE(0x00000, 0x03fff) AM_ROM
+ AM_RANGE(0x08000, 0x09fff) AM_ROM
+ AM_RANGE(0x0a000, 0x0ffff) AM_MIRROR(0x40000) AM_ROM
+ AM_RANGE(0x10000, 0x3ffff) AM_ROM
+ AM_RANGE(0x44000, 0x447ff) AM_RAM AM_BASE(&pacgal_videoram) // mspacman tilemap
+ AM_RANGE(0x45040, 0x4505f) AM_WRITE(pacman_sound_w) AM_BASE(&namco_soundregs)
+ AM_RANGE(0x44800, 0x45eff) AM_RAM
+ AM_RANGE(0x45f00, 0x45fff) AM_WRITE(_20pacgal_wavedata_w) AM_BASE(&namco_wavedata) // sound wave data
+ AM_RANGE(0x46000, 0x46fff) AM_WRITE(pacgal_charram_w) AM_BASE(&pacgal_charram) // char gfx data
+ AM_RANGE(0x47100, 0x47100) AM_RAM // leftover from original Galaga code
+ AM_RANGE(0x48000, 0x49fff) AM_ROM AM_BASE(&pacgal_videoram2)
+ AM_RANGE(0x48000, 0x49fff) AM_WRITE(pacgal_videoram2_w) // ROM or galaga tilemap (banked)
+ AM_RANGE(0x4c000, 0x4dfff) AM_WRITE(pacgal_sprram_w) AM_BASE(&pacgal_sprram) // sprite gfx data
+ AM_RANGE(0x4e000, 0x4e17f) AM_WRITE(MWA8_RAM) AM_BASE(&spriteram) // sprite registers
+ AM_RANGE(0x4ff00, 0x4ffff) AM_WRITE(pacgal_lookup_w) // sprite color lookup table
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( 20pacgal_port, ADDRESS_SPACE_IO, 8 )
+ ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
+ AM_RANGE(0x00, 0x3f) AM_NOP /* Z180 internal registers */
+ AM_RANGE(0x40, 0x7f) AM_NOP /* Z180 internal registers */
+ AM_RANGE(0x80, 0x80) AM_READ(input_port_0_r)
+ AM_RANGE(0x81, 0x81) AM_READ(input_port_1_r)
+ AM_RANGE(0x82, 0x82) AM_READ(input_port_2_r)
+ AM_RANGE(0x80, 0x80) AM_WRITE(watchdog_reset_w)
+ AM_RANGE(0x81, 0x81) AM_WRITE(MWA8_NOP) // ??? pulsed by the timer irq
+ AM_RANGE(0x82, 0x82) AM_WRITE(irqack_w)
+ AM_RANGE(0x85, 0x86) AM_WRITE(MWA8_NOP) // stars: rng seed (lo/hi)
+ AM_RANGE(0x87, 0x87) AM_READWRITE(eeprom_r, eeprom_w)
+ AM_RANGE(0x88, 0x88) AM_WRITE(pacgal_active_game_w)
+ AM_RANGE(0x89, 0x89) AM_WRITE(pacgal_dac_w)
+ AM_RANGE(0x8a, 0x8a) AM_WRITE(MWA8_NOP) // stars: bits 3-4 = active set; bit 5 = enable
+ AM_RANGE(0x8b, 0x8b) AM_WRITE(flipscreen_w)
+ AM_RANGE(0x8f, 0x8f) AM_WRITE(coin_w) // coin counter
+ADDRESS_MAP_END
+
+
+
+static INPUT_PORTS_START( 20pacgal )
+ PORT_START
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 )
+
+ PORT_START
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_COCKTAIL
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_COCKTAIL
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_COCKTAIL
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_COCKTAIL
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START3 )
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START2 )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START4 )
+
+ PORT_START
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME( DEF_STR( Service_Mode )) PORT_CODE(KEYCODE_F2)
+INPUT_PORTS_END
+
+
+
+static const gfx_layout charlayout =
+{
+ 8,8,
+ 256,
+ 2,
+ { 0, 4 },
+ { 8*8+0, 8*8+1, 8*8+2, 8*8+3, 0, 1, 2, 3 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
+ 16*8
+};
+
+
+static const gfx_layout spritelayout =
+{
+ 16,16,
+ 128,
+ 2,
+ { 0, 1 },
+ { 0*2, 1*2, 2*2, 3*2, 4*2, 5*2, 6*2, 7*2, 8*2, 9*2, 10*2, 11*2, 12*2, 13*2, 14*2, 15*2 },
+ { 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32, 8*32, 9*32, 10*32, 11*32, 12*32, 13*32, 14*32, 15*32 },
+ 16*32
+};
+
+static GFXDECODE_START( 20pacgal )
+ /* the game dynamically modifies these */
+ GFXDECODE_ENTRY( 0, 0, charlayout, 0, 64 )
+ GFXDECODE_ENTRY( 0, 0, spritelayout, 0, 64 )
+GFXDECODE_END
+
+static struct namco_interface namco_interface =
+{
+ 3, /* number of voices */
+ -1, /* memory region */
+};
+
+static MACHINE_DRIVER_START( 20pacgal )
+
+ /* basic machine hardware */
+ MDRV_CPU_ADD(Z180,20000000) /* 20MHz ??? Needs to be verified! */
+ MDRV_CPU_PROGRAM_MAP(20pacgal_map,0)
+ MDRV_CPU_IO_MAP(20pacgal_port,0)
+ MDRV_CPU_VBLANK_INT(irq0_line_assert,1)
+
+ MDRV_SCREEN_REFRESH_RATE(60)
+ MDRV_SCREEN_VBLANK_TIME(DEFAULT_60HZ_VBLANK_DURATION)
+
+ MDRV_NVRAM_HANDLER(eeprom)
+
+ /* video hardware */
+ MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
+ MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
+ MDRV_SCREEN_SIZE(36*8, 28*8)
+ MDRV_SCREEN_VISIBLE_AREA(0*8, 36*8-1, 0*8, 28*8-1)
+ MDRV_GFXDECODE(20pacgal)
+ MDRV_PALETTE_LENGTH(0x1000)
+ MDRV_COLORTABLE_LENGTH(0x100)
+ MDRV_PALETTE_INIT(20pacgal)
+ MDRV_VIDEO_START(20pacgal)
+ MDRV_VIDEO_UPDATE(20pacgal)
+
+ /* sound hardware */
+ MDRV_SPEAKER_STANDARD_MONO("mono")
+
+ MDRV_SOUND_ADD(NAMCO, 18432000/6/32)
+ MDRV_SOUND_CONFIG(namco_interface)
+ MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+
+ MDRV_SOUND_ADD(DAC, 0)
+ MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+MACHINE_DRIVER_END
+
+
+
+/***************************************************************************
+
+ Game driver(s)
+
+***************************************************************************/
+
+ROM_START( 20pacgal )
+ ROM_REGION( 0x100000, REGION_CPU1, 0 ) /* 1024k for Z180 address space */
+ ROM_LOAD( "20th_101.u13", 0x00000, 0x40000, CRC(77159582) SHA1(c05e005a941cbdc806dcd76b315069362c792a72) )
+
+ ROM_REGION( 0x8000, REGION_PROMS, 0 ) /* palette */
+ ROM_LOAD( "20th_101.u14", 0x0000, 0x8000, CRC(c19d9ad0) SHA1(002581fbc2c32cdf7cfb0b0f64061591a462ec14) )
+ROM_END
+
+
+
+GAME( 2000, 20pacgal, 0, 20pacgal, 20pacgal, 0, ROT90, "Namco", "Ms. Pac-Man/Galaga - 20 Year Reunion", GAME_IMPERFECT_GRAPHICS )