/***************************************************************************

    Beast Busters           A9003   (c) 1989 SNK Corporation
    Mechanized Attack       A8002   (c) 1989 SNK Corporation

    Beast Busters is a large dedicated (non-jamma) triple machine gun game,
    the gun positions values are read in an interrupt routine that must be
    called for each position (X and Y for 3 guns, so at least 6 times a
    frame).  However I can't make it work reliably..  So for the moment
    I'm writing the gun positions directly to memory and bypassing
    the IRQ routine.

    Mechanized Attack (A8002) is an earlier design, it only has one sprite
    chip, no eeprom, and only 2 machine guns, but the tilemaps are twice
    the size.

    Emulation by Bryan McPhail, mish@tendril.co.uk


Stephh's notes (based on the games M68000 code and some tests) :

1) 'bbusters'

  - Country/version is stored at 0x003954.w and the possible values are
    0x0000, 0x0004 and 0x0008 (0x000c being the same as 0x0008), 0x0008
    being the value stored in ROM in the current set.
    I haven't noticed any major effect (copyright/logo, language, coinage),
    the only thing I found is that the text relative to number of coins
    needed is different (but it's a lie as coinage is NOT modified).
    So my guess is that if other versions exist, part of the code (or at
    least data in it) will have to be different.
    Anyway, here is my guess to determine the versions (by using some infos
    from 'mechatt' :

       Value   Country
      0x0000    Japan
      0x0004    US?
      0x0008    World?   (value stored in the current set)
      0x000c    World?   (same as 0x0008 - impossible choice ?)

  - Coin buttons act differently depending on the "Coin Slots" Dip Switch :

      * "Coin Slots" Dip Switch set to "Common" :

          . COIN1    : adds coin(s)/credit(s) depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) depending on "Coin B" Dip Switch
          . COIN3    : NO EFFECT !
          . COIN4    : NO EFFECT !
          . COIN5    : NO EFFECT !
          . COIN6    : NO EFFECT !
          . SERVICE1 : adds coin(s)/credit(s) depending on "Coin A" Dip Switch

      * "Coin Slots" Dip Switch set to "Individual" :

          . COIN1    : adds coin(s)/credit(s) for player 1 depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) for player 1 depending on "Coin B" Dip Switch
          . COIN3    : adds coin(s)/credit(s) for player 2 depending on "Coin A" Dip Switch
          . COIN4    : adds coin(s)/credit(s) for player 2 depending on "Coin B" Dip Switch
          . COIN5    : adds coin(s)/credit(s) for player 3 depending on "Coin A" Dip Switch
          . COIN6    : adds coin(s)/credit(s) for player 3 depending on "Coin B" Dip Switch
          . SERVICE1 : adds coin(s)/credit(s) for all players depending on "Coin A" Dip Switch

    Note that I had to map COIN5 and COIN6 to SERVICE2 and SERVICE3 to be
    able to use the default parametrable keys. Let me know if there is a
    another (better ?) way to do so.


2) 'mechatt'

  - Country/version is stored at 0x06a000.w and the possible values are :

       Value   Country
      0x0000    Japan
      0x1111    World    (value stored in the current set)
      0x2222    US
      0x3333    Asia?    (it looks like Japanese text but some "symbols" are missing)

2a) Japan version

  - All texts are in Japanese.
  - "(c) 1989 (Corp) S-N-K".
  - "Coin Slots" Dip Switch has no effect.
  - "Coin A" and "Coin B" Dip Switches are the same as in the World version.
  - Coin buttons effect :

      * "Coin Slots" are ALWAYS considered as "Common" :

          . COIN1    : adds coin(s)/credit(s) depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) depending on "Coin B" Dip Switch
          . COIN3    : NO EFFECT !
          . COIN4    : NO EFFECT !
          . SERVICE1 : adds coin(s)/credit(s) depending on "Coin A" Dip Switch

2b) World version

  - All texts are in English.
  - "(c) 1989 SNK Corporation".
  - Coin buttons effect :

      * "Coin Slots" Dip Switch set to "Common" :

          . COIN1    : adds coin(s)/credit(s) depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) depending on "Coin B" Dip Switch
          . COIN3    : NO EFFECT !
          . COIN4    : NO EFFECT !
          . SERVICE1 : adds coin(s)/credit(s) depending on "Coin A" Dip Switch

      * "Coin Slots" Dip Switch set to "Individual" :

          . COIN1    : adds coin(s)/credit(s) for player 1 depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) for player 1 depending on "Coin B" Dip Switch
          . COIN3    : adds coin(s)/credit(s) for player 2 depending on "Coin A" Dip Switch
          . COIN4    : adds coin(s)/credit(s) for player 2 depending on "Coin B" Dip Switch
          . SERVICE1 : adds coin(s)/credit(s) for all players depending on "Coin A" Dip Switch

2c) US version

  - All texts are in English.
  - "(c) 1989 SNK Corp. of America".
  - Additional FBI logo as first screen as well as small FBI notice at the bottom left
    of the screens until a coin is inserted.
  - "Coin Slots" Dip Switch has no effect.
  - "Coin A" Dip Switch is different from the World version :

      World      US
      4C_1C    "Free Play"
      3C_1C    special (see below)
      2C_1C    "2 Coins to Start, 1 to Continue"
      1C_1C    1C_1C

    It's a bit hard to explain the "special" coinage, so here are some infos :

      * when you insert a coin before starting a game, you are awarded 2 credits
        if credits == 0, else you are awarded 1 credit
      * when you insert a coin to continue, you are ALWAYS awarded 1 credit

  - "Coin B" Dip Switch has no effect.

  - Coin buttons effect :

      * "Coin Slots" are ALWAYS considered as "Individual" :

          . COIN1    : adds coin(s)/credit(s) for player 1 depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) for player 2 depending on "Coin A" Dip Switch
          . COIN3    : NO EFFECT !
          . COIN4    : NO EFFECT !
          . SERVICE1 : adds coin(s)/credit(s) for all players depending on "Coin A" Dip Switch

2d) Asia? version

  - All texts are in Japanese ? (to be confirmed)
  - "(c) 1989 SNK Corporation".
  - "Coin Slots" Dip Switch has no effect.
  - "Coin A" and "Coin B" Dip Switches are the same as in the World version.
  - Coin buttons effect :

      * "Coin Slots" are ALWAYS considered as "Common" :

          . COIN1    : adds coin(s)/credit(s) depending on "Coin A" Dip Switch
          . COIN2    : adds coin(s)/credit(s) depending on "Coin B" Dip Switch
          . COIN3    : NO EFFECT !
          . COIN4    : NO EFFECT !
          . SERVICE1 : adds coin(s)/credit(s) depending on "Coin A" Dip Switch



HIGHWAYMAN's notes:

after adding the mechanized attack u.s. roms i suspect that there is more than just a few bytes changed ;-)

***************************************************************************/

#include "driver.h"
#include "sound/2608intf.h"
#include "sound/2610intf.h"

#define BBUSTERS_HACK	0
#define MECHATT_HACK	0

VIDEO_START( bbuster );
VIDEO_START( mechatt );
VIDEO_UPDATE( bbuster );
VIDEO_UPDATE( mechatt );

static UINT16 *bbuster_ram, *eprom_data;
extern UINT16 *bbuster_pf1_data,*bbuster_pf2_data,*bbuster_pf1_scroll_data,*bbuster_pf2_scroll_data;

WRITE16_HANDLER( bbuster_pf1_w );
WRITE16_HANDLER( bbuster_pf2_w );
WRITE16_HANDLER( bbuster_video_w );

/******************************************************************************/

#if BBUSTERS_HACK
static MACHINE_RESET( bbusters )
{
	UINT16 *RAM = (UINT16 *)memory_region(REGION_CPU1);
	int data = readinputportbytag("FAKE1") & 0x03;

	/* Country/Version :
         - 0x0000 : Japan?
           - 0x0004 : US?
           - 0x0008 : World?    (default)
           - 0x000c : World?    (same as 0x0008)
    */

	RAM[0x003954/2] = data * 4;

//  memset (eprom_data, 0xff, 0x80);    // Force EEPROM reset
}
#endif

#if MECHATT_HACK
static MACHINE_RESET( mechatt )
{
	UINT16 *RAM = (UINT16 *)memory_region(REGION_CPU1);
	int data = readinputportbytag("FAKE1") & 0x03;

	/* Country :
         - 0x0000 : Japan
           - 0x1111 : World (default)
           - 0x2222 : US
           - 0x3333 : Asia?
    */

	RAM[0x06a000/2] = (data << 12) | (data << 8) | (data << 4) | (data << 0);
}
#endif

/******************************************************************************/

static READ16_HANDLER( sound_cpu_r )
{
	return 0x01;
}

/* Eprom is byte wide, top half of word _must_ be 0xff */
static READ16_HANDLER( eprom_r )
{
	return (eprom_data[offset]&0xff) | 0xff00;
}

static int gun_select;

static READ16_HANDLER( control_3_r )
{
	return readinputport(gun_select);
}

static WRITE16_HANDLER( gun_select_w )
{
	logerror("%08x: gun r\n",activecpu_get_pc());

	gun_select=5 + (data&0xff);
}

static READ16_HANDLER( kludge_r )
{
	bbuster_ram[0xa692/2]=readinputportbytag("IN5")<<1;
	bbuster_ram[0xa694/2]=readinputportbytag("IN6")<<1;
	bbuster_ram[0xa696/2]=readinputportbytag("IN7")<<1;
	bbuster_ram[0xa698/2]=readinputportbytag("IN8")<<1;
	bbuster_ram[0xa69a/2]=readinputportbytag("IN9")<<1;
	bbuster_ram[0xa69c/2]=readinputportbytag("IN10")<<1;
	return 0;
}

static WRITE16_HANDLER( sound_cpu_w )
{
	soundlatch_w(0,data&0xff);
	cpunum_set_input_line(1,INPUT_LINE_NMI,PULSE_LINE);
}

static READ16_HANDLER( mechatt_gun_r )
{
	int baseport=2,x,y;
	if (offset) baseport=4; /* Player 2 */

	x=readinputport(baseport);
	y=readinputport(baseport+1);

	/* Todo - does the hardware really clamp like this? */
	x+=0x18;
	if (x>0xff) x=0xff;
	if (y>0xef) y=0xef;

	return x|(y<<8);
}

/*******************************************************************************/

static ADDRESS_MAP_START( bbuster_readmem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x07ffff) AM_READ(MRA16_ROM)
	AM_RANGE(0x080000, 0x08ffff) AM_READ(MRA16_RAM)
	AM_RANGE(0x090000, 0x090fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0a0000, 0x0a0fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0a8000, 0x0a8fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0b0000, 0x0b1fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0b2000, 0x0b3fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0d0000, 0x0d0fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0e0000, 0x0e0001) AM_READ(input_port_2_word_r) /* Coins */
	AM_RANGE(0x0e0002, 0x0e0003) AM_READ(input_port_0_word_r) /* Player 1 & 2 */
	AM_RANGE(0x0e0004, 0x0e0005) AM_READ(input_port_1_word_r) /* Player 3 */
	AM_RANGE(0x0e0008, 0x0e0009) AM_READ(input_port_3_word_r) /* Dip 1 */
	AM_RANGE(0x0e000a, 0x0e000b) AM_READ(input_port_4_word_r) /* Dip 2 */
	AM_RANGE(0x0e0018, 0x0e0019) AM_READ(sound_cpu_r)
	AM_RANGE(0x0e8000, 0x0e8001) AM_READ(kludge_r)
	AM_RANGE(0x0e8002, 0x0e8003) AM_READ(control_3_r)
	AM_RANGE(0x0f8000, 0x0f80ff) AM_READ(eprom_r) /* Eeprom */
ADDRESS_MAP_END

static ADDRESS_MAP_START( bbuster_writemem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x07ffff) AM_WRITE(MWA16_ROM)
	AM_RANGE(0x080000, 0x08ffff) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_ram)
	AM_RANGE(0x090000, 0x090fff) AM_WRITE(bbuster_video_w) AM_BASE(&videoram16)
	AM_RANGE(0x0a0000, 0x0a0fff) AM_WRITE(MWA16_RAM) AM_BASE(&spriteram16) AM_SIZE(&spriteram_size)
	AM_RANGE(0x0a8000, 0x0a8fff) AM_WRITE(MWA16_RAM) AM_BASE(&spriteram16_2) AM_SIZE(&spriteram_2_size)
	AM_RANGE(0x0b0000, 0x0b1fff) AM_WRITE(bbuster_pf1_w) AM_BASE(&bbuster_pf1_data)
	AM_RANGE(0x0b2000, 0x0b3fff) AM_WRITE(bbuster_pf2_w) AM_BASE(&bbuster_pf2_data)
	AM_RANGE(0x0b8000, 0x0b8003) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_pf1_scroll_data)
	AM_RANGE(0x0b8008, 0x0b800b) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_pf2_scroll_data)
	AM_RANGE(0x0d0000, 0x0d0fff) AM_WRITE(paletteram16_RRRRGGGGBBBBxxxx_word_w) AM_BASE(&paletteram16)
	AM_RANGE(0x0e8000, 0x0e8001) AM_WRITE(gun_select_w)
	AM_RANGE(0x0f0008, 0x0f0009) AM_WRITE(MWA16_NOP)
	AM_RANGE(0x0f0018, 0x0f0019) AM_WRITE(sound_cpu_w)
	AM_RANGE(0x0f8000, 0x0f80ff) AM_WRITE(MWA16_RAM) AM_BASE(&eprom_data) /* Eeprom */
ADDRESS_MAP_END

/*******************************************************************************/

static ADDRESS_MAP_START( mechatt_readmem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x06ffff) AM_READ(MRA16_ROM)
	AM_RANGE(0x070000, 0x07ffff) AM_READ(MRA16_RAM)
	AM_RANGE(0x090000, 0x090fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0a0000, 0x0a0fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0b0000, 0x0b3fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0c0000, 0x0c3fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0d0000, 0x0d07ff) AM_READ(MRA16_RAM)
	AM_RANGE(0x0e0000, 0x0e0001) AM_READ(input_port_0_word_r)
	AM_RANGE(0x0e0002, 0x0e0003) AM_READ(input_port_1_word_r)
	AM_RANGE(0x0e0004, 0x0e0007) AM_READ(mechatt_gun_r)
	AM_RANGE(0x0e8000, 0x0e8001) AM_READ(sound_cpu_r)
ADDRESS_MAP_END

static ADDRESS_MAP_START( mechatt_writemem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x06ffff) AM_WRITE(MWA16_ROM)
	AM_RANGE(0x070000, 0x07ffff) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_ram)
	AM_RANGE(0x090000, 0x090fff) AM_WRITE(bbuster_video_w) AM_BASE(&videoram16)
	AM_RANGE(0x0a0000, 0x0a0fff) AM_WRITE(MWA16_RAM) AM_BASE(&spriteram16) AM_SIZE(&spriteram_size)
	AM_RANGE(0x0a1000, 0x0a7fff) AM_WRITE(MWA16_NOP)
	AM_RANGE(0x0b0000, 0x0b3fff) AM_WRITE(bbuster_pf1_w) AM_BASE(&bbuster_pf1_data)
	AM_RANGE(0x0b8000, 0x0b8003) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_pf1_scroll_data)
	AM_RANGE(0x0c0000, 0x0c3fff) AM_WRITE(bbuster_pf2_w) AM_BASE(&bbuster_pf2_data)
	AM_RANGE(0x0c8000, 0x0c8003) AM_WRITE(MWA16_RAM) AM_BASE(&bbuster_pf2_scroll_data)
	AM_RANGE(0x0d0000, 0x0d07ff) AM_WRITE(paletteram16_RRRRGGGGBBBBxxxx_word_w) AM_BASE(&paletteram16)
	AM_RANGE(0x0e4002, 0x0e4003) AM_WRITE(MWA16_NOP) /* Gun force feedback? */
	AM_RANGE(0x0e8000, 0x0e8001) AM_WRITE(sound_cpu_w)
ADDRESS_MAP_END

/******************************************************************************/

static ADDRESS_MAP_START( sound_readmem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0xefff) AM_READ(MRA8_ROM)
	AM_RANGE(0xf000, 0xf7ff) AM_READ(MRA8_RAM)
	AM_RANGE(0xf800, 0xf800) AM_READ(soundlatch_r)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_writemem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0xefff) AM_WRITE(MWA8_ROM)
	AM_RANGE(0xf000, 0xf7ff) AM_WRITE(MWA8_RAM)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_readport, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
	AM_RANGE(0x00, 0x00) AM_READ(YM2610_status_port_0_A_r)
	AM_RANGE(0x02, 0x02) AM_READ(YM2610_status_port_0_B_r)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_writeport, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
	AM_RANGE(0x00, 0x00) AM_WRITE(YM2610_control_port_0_A_w)
	AM_RANGE(0x01, 0x01) AM_WRITE(YM2610_data_port_0_A_w)
	AM_RANGE(0x02, 0x02) AM_WRITE(YM2610_control_port_0_B_w)
	AM_RANGE(0x03, 0x03) AM_WRITE(YM2610_data_port_0_B_w)
	AM_RANGE(0xc0, 0xc1) AM_WRITE(MWA8_NOP) /* -> Main CPU */
ADDRESS_MAP_END

static ADDRESS_MAP_START( sounda_readport, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
	AM_RANGE(0x00, 0x00) AM_READ(YM2608_status_port_0_A_r)
	AM_RANGE(0x02, 0x02) AM_READ(YM2608_status_port_0_B_r)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sounda_writeport, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(8) )
	AM_RANGE(0x00, 0x00) AM_WRITE(YM2608_control_port_0_A_w)
	AM_RANGE(0x01, 0x01) AM_WRITE(YM2608_data_port_0_A_w)
	AM_RANGE(0x02, 0x02) AM_WRITE(YM2608_control_port_0_B_w)
	AM_RANGE(0x03, 0x03) AM_WRITE(YM2608_data_port_0_B_w)
	AM_RANGE(0xc0, 0xc1) AM_WRITE(MWA8_NOP) /* -> Main CPU */
ADDRESS_MAP_END

/******************************************************************************/

static INPUT_PORTS_START( bbusters )
	PORT_START_TAG("IN0")	/* Player controls */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)	PORT_NAME("P1 Fire")	// "Fire"
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)	PORT_NAME("P1 Grenade")	// "Grenade"
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)	PORT_NAME("P2 Fire")	// "Fire"
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)	PORT_NAME("P2 Grenade")	// "Grenade"
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START_TAG("IN1")	/* Player controls */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START3 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(3)	PORT_NAME("P3 Fire")	// "Fire"
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(3)	PORT_NAME("P3 Grenade")	// "Grenade"
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED )
	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_UNKNOWN )

	PORT_START_TAG("IN2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_COIN4 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN5 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN6 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 )		// See notes
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START_TAG("DSW1")	/* Dip switch bank 1 */
	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Allow_Continue ) )
	PORT_DIPSETTING(    0x00, DEF_STR( No ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x06, 0x06, "Magazine / Grenade" )
	PORT_DIPSETTING(    0x04, "5 / 2" )
	PORT_DIPSETTING(    0x06, "7 / 3" )
	PORT_DIPSETTING(    0x02, "9 / 4" )
	PORT_DIPSETTING(    0x00, "12 / 5" )
	PORT_DIPNAME( 0x18, 0x18, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x18, DEF_STR( 1C_1C ) )
	PORT_DIPNAME( 0x60, 0x60, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(    0x60, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x40, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x80, 0x80, "Coin Slots" )			// See notes
	PORT_DIPSETTING(    0x80, "Common" )
	PORT_DIPSETTING(    0x00, "Individual" )

	PORT_START_TAG("DSW2")	/* Dip switch bank 2 */
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x03, DEF_STR( Normal ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Hard ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
	PORT_DIPNAME( 0x0c, 0x0c, "Game Mode" )
	PORT_DIPSETTING(    0x08, "Demo Sounds Off" )
	PORT_DIPSETTING(    0x0c, "Demo Sounds On" )
	PORT_DIPSETTING(    0x04, "Infinite Energy (Cheat)")
	PORT_DIPSETTING(    0x00, "Freeze" )
	PORT_DIPUNUSED( 0x10, IP_ACTIVE_LOW )
	PORT_DIPUNUSED( 0x20, IP_ACTIVE_LOW )
	PORT_DIPUNUSED( 0x40, IP_ACTIVE_LOW )
 	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )

	PORT_START_TAG("IN5")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(1)
	PORT_START_TAG("IN6")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(1)

	PORT_START_TAG("IN7")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(2)
	PORT_START_TAG("IN8")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(2)

	PORT_START_TAG("IN9")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(3)
	PORT_START_TAG("IN10")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(3)

#if BBUSTERS_HACK
	PORT_START_TAG("FAKE1")
	PORT_DIPNAME( 0x03, 0x02, "Country/Version" )
	PORT_DIPSETTING(    0x00, "Japan?" )
	PORT_DIPSETTING(    0x01, "US?" )
	PORT_DIPSETTING(    0x02, "World?" )
//  PORT_DIPSETTING(    0x03, "World?" )            // Same as "0008" - impossible choice ?
#endif
INPUT_PORTS_END

static INPUT_PORTS_START( mechatt )
	PORT_START_TAG("IN0")
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_SERVICE1 )		// See notes
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_COIN4 )
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("P1 Fire")	// "Fire"
	PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("P1 Grenade")	// "Grenade"
	PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_NAME("P2 Fire")	// "Fire"
	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_NAME("P2 Grenade")	// "Grenade"
	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START_TAG("DSW1")	/* Dip switch bank 1 */
	PORT_DIPNAME( 0x0001, 0x0001, "Coin Slots" )		// See notes
	PORT_DIPSETTING(      0x0001, "Common" )
	PORT_DIPSETTING(      0x0000, "Individual" )
	PORT_DIPNAME( 0x0002, 0x0002, DEF_STR( Allow_Continue ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( No ) )
	PORT_DIPSETTING(      0x0002, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x000c, 0x000c, "Magazine / Grenade" )
	PORT_DIPSETTING(      0x0008, "5 / 2" )
	PORT_DIPSETTING(      0x000c, "6 / 3" )
	PORT_DIPSETTING(      0x0004, "7 / 4" )
	PORT_DIPSETTING(      0x0000, "8 / 5" )
	PORT_DIPNAME( 0x0030, 0x0030, DEF_STR( Coin_A ) )	// See notes
	PORT_DIPSETTING(      0x0000, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(      0x0010, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(      0x0020, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(      0x0030, DEF_STR( 1C_1C ) )
	PORT_DIPNAME( 0x00c0, 0x00c0, DEF_STR( Coin_B ) )	// See notes
	PORT_DIPSETTING(      0x00c0, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(      0x0080, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(      0x0040, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( 1C_4C ) )
	PORT_DIPNAME( 0x0300, 0x0300, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(      0x0200, DEF_STR( Easy ) )
	PORT_DIPSETTING(      0x0300, DEF_STR( Normal ) )
	PORT_DIPSETTING(      0x0100, DEF_STR( Hard ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( Hardest ) )
	PORT_DIPNAME( 0x0c00, 0x0c00, "Game Mode" )
	PORT_DIPSETTING(      0x0800, "Demo Sounds Off" )
	PORT_DIPSETTING(      0x0c00, "Demo Sounds On" )
	PORT_DIPSETTING(      0x0400, "Infinite Energy (Cheat)")
	PORT_DIPSETTING(      0x0000, "Freeze" )
	PORT_DIPUNUSED( 0x1000, IP_ACTIVE_LOW )
	PORT_DIPUNUSED( 0x2000, IP_ACTIVE_LOW )
	PORT_DIPUNUSED( 0x4000, IP_ACTIVE_LOW )
 	PORT_SERVICE( 0x8000, IP_ACTIVE_LOW )

	PORT_START_TAG("IN2")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(1)
	PORT_START_TAG("IN3")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(1)

	PORT_START_TAG("IN4")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(2)
	PORT_START_TAG("IN5")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(2)

#if MECHATT_HACK
	PORT_START_TAG("FAKE1")
	PORT_DIPNAME( 0x03, 0x01, "Country" )
	PORT_DIPSETTING(    0x00, DEF_STR( Japan ) )
	PORT_DIPSETTING(    0x01, DEF_STR( World ) )
	PORT_DIPSETTING(    0x02, "US" )
	PORT_DIPSETTING(    0x03, "Asia?" )
#endif
INPUT_PORTS_END

/******************************************************************************/

static const gfx_layout charlayout =
{
	8,8,
	RGN_FRAC(1,1),
	4,
	{ 0, 1, 2, 3 },
	{ 0,4,8,12,16,20,24,28 },
	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32 },
	32*8
};

static const gfx_layout spritelayout =
{
	16,16,
	RGN_FRAC(1,1),
	4,
	{ 8, 12, 0, 4 },
	{
		0, 1, 2, 3,
		16,17,18,19,

		0+32*8, 1+32*8, 2+32*8, 3+32*8,
		16+32*8,17+32*8,18+32*8,19+32*8,
	},
	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
			16*32, 17*32, 18*32, 19*32, 20*32, 21*32, 22*32, 23*32 },
	128*8
};

static const gfx_layout tilelayout =
{
	16,16,	/* 16*16 sprites */
	RGN_FRAC(1,1),
	4,	/* 4 bits per pixel */
	{ 0, 1, 2, 3 },
	{ 0, 4, 8, 12, 16, 20, 24, 28,
		0+64*8, 4+64*8, 8+64*8, 12+64*8,
		16+64*8,20+64*8,24+64*8,28+64*8,
	},
	{ 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 },
	128*8
};

static GFXDECODE_START( bbusters )
	GFXDECODE_ENTRY( REGION_GFX1, 0, charlayout,     0, 16 )
	GFXDECODE_ENTRY( REGION_GFX2, 0, spritelayout, 256, 16 )
	GFXDECODE_ENTRY( REGION_GFX3, 0, spritelayout, 512, 16 )
	GFXDECODE_ENTRY( REGION_GFX4, 0, tilelayout,   768, 16 )
	GFXDECODE_ENTRY( REGION_GFX5, 0, tilelayout,  1024+256, 16 )
GFXDECODE_END

static GFXDECODE_START( mechatt )
	GFXDECODE_ENTRY( REGION_GFX1, 0, charlayout,     0, 16 )
	GFXDECODE_ENTRY( REGION_GFX2, 0, spritelayout, 256, 16 )
	GFXDECODE_ENTRY( REGION_GFX3, 0, spritelayout, 512, 16 )
	GFXDECODE_ENTRY( REGION_GFX4, 0, tilelayout,   512, 16 )
	GFXDECODE_ENTRY( REGION_GFX5, 0, tilelayout,   768, 16 )
GFXDECODE_END

/******************************************************************************/

static void sound_irq( int irq )
{
	cpunum_set_input_line(1,0,irq ? ASSERT_LINE : CLEAR_LINE);
}

static const struct YM2608interface ym2608_interface =
{
	0,0,0,0,sound_irq,
	REGION_SOUND1
};

static const struct YM2610interface ym2610_interface =
{
	sound_irq,
	REGION_SOUND2,
	REGION_SOUND1
};

/******************************************************************************/

static NVRAM_HANDLER( bbusters )
{
	if( read_or_write ) {
		mame_fwrite (file, eprom_data, 0x80);
	}
	else {
		if (file)
			mame_fread (file, eprom_data, 0x80);
		else
			memset (eprom_data, 0xff, 0x80);
	}
}

static INTERRUPT_GEN( bbuster )
{
	if (cpu_getiloops()==0)
		cpunum_set_input_line(0, 6, HOLD_LINE); /* VBL */
	else
		cpunum_set_input_line(0, 2, HOLD_LINE); /* at least 6 interrupts per frame to read gun controls */
}

static VIDEO_EOF( bbuster )
{
	buffer_spriteram16_w(0,0,0);
	buffer_spriteram16_2_w(0,0,0);
}

static VIDEO_EOF( mechatt )
{
	buffer_spriteram16_w(0,0,0);
}

static MACHINE_DRIVER_START( bbusters )

	/* basic machine hardware */
	MDRV_CPU_ADD(M68000, 12000000)
	MDRV_CPU_PROGRAM_MAP(bbuster_readmem,bbuster_writemem)
	MDRV_CPU_VBLANK_INT(bbuster,4)

	MDRV_CPU_ADD(Z80,4000000) /* Accurate */
	/* audio CPU */
	MDRV_CPU_PROGRAM_MAP(sound_readmem,sound_writemem)
	MDRV_CPU_IO_MAP(sound_readport,sound_writeport)

	MDRV_SCREEN_REFRESH_RATE(60)

#if BBUSTERS_HACK
	MDRV_MACHINE_RESET(bbusters)
#endif

	MDRV_NVRAM_HANDLER(bbusters)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_BUFFERS_SPRITERAM)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
	MDRV_GFXDECODE(bbusters)
	MDRV_PALETTE_LENGTH(2048)

	MDRV_VIDEO_START(bbuster)
	MDRV_VIDEO_UPDATE(bbuster)
	MDRV_VIDEO_EOF(bbuster)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_STEREO("left", "right")

	MDRV_SOUND_ADD(YM2610, 8000000)
	MDRV_SOUND_CONFIG(ym2610_interface)
	MDRV_SOUND_ROUTE(0, "left",  0.60)
	MDRV_SOUND_ROUTE(0, "right", 0.60)
	MDRV_SOUND_ROUTE(1, "left",  0.20)
	MDRV_SOUND_ROUTE(2, "right", 0.20)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( mechatt )

	/* basic machine hardware */
	MDRV_CPU_ADD(M68000, 12000000)
	MDRV_CPU_PROGRAM_MAP(mechatt_readmem,mechatt_writemem)
	MDRV_CPU_VBLANK_INT(irq4_line_hold,1)

	MDRV_CPU_ADD(Z80,4000000) /* Accurate */
	/* audio CPU */
	MDRV_CPU_PROGRAM_MAP(sound_readmem,sound_writemem)
	MDRV_CPU_IO_MAP(sounda_readport,sounda_writeport)

	MDRV_SCREEN_REFRESH_RATE(60)

#if MECHATT_HACK
	MDRV_MACHINE_RESET(mechatt)
#endif

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_BUFFERS_SPRITERAM)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1)
	MDRV_GFXDECODE(mechatt)
	MDRV_PALETTE_LENGTH(1024)

	MDRV_VIDEO_START(mechatt)
	MDRV_VIDEO_UPDATE(mechatt)
	MDRV_VIDEO_EOF(mechatt)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_STEREO("left", "right")

	MDRV_SOUND_ADD(YM2608, 8000000)
	MDRV_SOUND_CONFIG(ym2608_interface)
	MDRV_SOUND_ROUTE(0, "left",  0.50)
	MDRV_SOUND_ROUTE(0, "right", 0.50)
	MDRV_SOUND_ROUTE(1, "left",  1.0)
	MDRV_SOUND_ROUTE(2, "right", 1.0)
MACHINE_DRIVER_END

/******************************************************************************/

ROM_START( bbusters )
	ROM_REGION( 0x80000, REGION_CPU1, 0 )
	ROM_LOAD16_BYTE( "bb-3.k10",   0x000000, 0x20000, CRC(04da1820) SHA1(0b6e06adf9c181d7aef28f781efbdd2c225fe81e) )
	ROM_LOAD16_BYTE( "bb-5.k12",   0x000001, 0x20000, CRC(777e0611) SHA1(b7ac0c6ea3738d560a5be75aed286821de918808) )
	ROM_LOAD16_BYTE( "bb-2.k8",    0x040000, 0x20000, CRC(20141805) SHA1(0958579681bda81bcf48d020a14bc147c1e575f1) )
	ROM_LOAD16_BYTE( "bb-4.k11",   0x040001, 0x20000, CRC(d482e0e9) SHA1(e56ca92965e8954b613ba4b0e3975e3a12840c30) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )
	ROM_LOAD( "bb-1.e6",     0x000000, 0x10000, CRC(4360f2ee) SHA1(4c6b212f59389bdf4388893d2030493b110ac087) )

	ROM_REGION( 0x020000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "bb-10.l9",    0x000000, 0x20000, CRC(490c0d9b) SHA1(567c25a6d96407259c64061d674305e4117d9fa4) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD( "bb-f11.m16",  0x000000, 0x80000, CRC(39fdf9c0) SHA1(80392947e3a1831c3ee80139f6f3bdc3bafa4f0d) )
	ROM_LOAD( "bb-f12.m13",  0x080000, 0x80000, CRC(69ee046b) SHA1(5c0435f1ce76b584fa8d154d7617d73c7ab5f62f) )
	ROM_LOAD( "bb-f13.m12",  0x100000, 0x80000, CRC(f5ef840e) SHA1(dd0f630c52076e0d330f47931e68a3ae9a401078) )
	ROM_LOAD( "bb-f14.m11",  0x180000, 0x80000, CRC(1a7df3bb) SHA1(1f27a528e6f89fe56a7342c4f1ff733da0a09327) )

	ROM_REGION( 0x200000, REGION_GFX3, ROMREGION_DISPOSE )
	ROM_LOAD( "bb-f21.l10",  0x000000, 0x80000, CRC(530f595b) SHA1(820898693b878c4423de9c244f943d39ea69515e) )
	ROM_LOAD( "bb-f22.l12",  0x080000, 0x80000, CRC(889c562e) SHA1(d19172d6515ab9793c98de75d6e41687e61a408d) )
	ROM_LOAD( "bb-f23.l13",  0x100000, 0x80000, CRC(c89fe0da) SHA1(92be860a7191e7473c42aa2da981eda873219d3d) )
	ROM_LOAD( "bb-f24.l15",  0x180000, 0x80000, CRC(e0d81359) SHA1(2213c17651b6c023a456447f352b0739439f913a) )

	ROM_REGION( 0x80000, REGION_GFX4, ROMREGION_DISPOSE )
	ROM_LOAD( "bb-back1.m4", 0x000000, 0x80000, CRC(b5445313) SHA1(3c99b557b2af30ff0fbc8a7dc6c40448c4f327db) )

	ROM_REGION( 0x80000, REGION_GFX5, ROMREGION_DISPOSE )
	ROM_LOAD( "bb-back2.m6", 0x000000, 0x80000, CRC(8be996f6) SHA1(1e2c56f4c24793f806d7b366b92edc03145ae94c) )

	ROM_REGION( 0x10000, REGION_USER1, 0 ) /* Zoom table */
	ROM_LOAD( "bb-6.e7",       0x000000, 0x10000, CRC(61f3de03) SHA1(736f9634fe054ea68a2aa90a743bd0dc320f23c9) )
	/* This rom also as bb-7.h7 */
	/* This rom also as bb-8.a14 */
	/* This rom also as bb-9.c14 */

	ROM_REGION( 0x80000, REGION_SOUND1, 0 )
	ROM_LOAD( "bb-pcma.l5",  0x000000, 0x80000, CRC(44cd5bfe) SHA1(26a612191a0aa614c090203485aba17c99c763ee) )

	ROM_REGION( 0x80000, REGION_SOUND2, 0 )
	ROM_LOAD( "bb-pcmb.l3",  0x000000, 0x80000, CRC(c8d5dd53) SHA1(0f7e94532cc14852ca12c1b792e5479667af899e) )
ROM_END

ROM_START( mechatt )
	ROM_REGION( 0x80000, REGION_CPU1, 0 )
	ROM_LOAD16_BYTE( "ma5-e.bin", 0x000000, 0x20000, CRC(9bbb852a) SHA1(34b696bf79cf53cac1c384a3143c0f3f243a71f3) )
	ROM_LOAD16_BYTE( "ma4.bin",   0x000001, 0x20000, CRC(0d414918) SHA1(0d51b893d37ba124b983beebb691e65bdc52d300) )
	ROM_LOAD16_BYTE( "ma7.bin",   0x040000, 0x20000, CRC(61d85e1b) SHA1(46234d48ac21c481a5e70c6a654a341ebdd4cd3a) )
	ROM_LOAD16_BYTE( "ma6-f.bin", 0x040001, 0x20000, CRC(4055fe8d) SHA1(b4d8bd5f73805ce1c332eff657dddbb88ff45b37) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )
	ROM_LOAD( "ma3.bin",       0x000000, 0x10000, CRC(c06cc8e1) SHA1(65f5f1901120d633f7c3ba07432a188fd7fd7272) )

	ROM_REGION( 0x020000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "ma1.bin",       0x000000, 0x10000, CRC(24766917) SHA1(9082a8ae849605ce65b5a0493ae69cfe282f7e7b) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD( "mao89p13.bin",  0x000000, 0x80000, CRC(8bcb16cf) SHA1(409ee1944188d9ce39adce29b1df029b560dd5b0) )
	ROM_LOAD( "ma189p15.bin",  0x080000, 0x80000, CRC(b84d9658) SHA1(448adecb0067d8f5b219ec2f94a8dec84187a554) )
	ROM_LOAD( "ma289p17.bin",  0x100000, 0x80000, CRC(6cbe08ac) SHA1(8f81f6e92b84ab6867452011d52f3e7689c62a1a) )
	ROM_LOAD( "ma389m15.bin",  0x180000, 0x80000, CRC(34d4585e) SHA1(38d9fd5d775e4b3c8b8b487a6ba9b8bdcb3274b0) )

	ROM_REGION( 0x10000, REGION_GFX3, ROMREGION_DISPOSE )
	/* Unused */

	ROM_REGION( 0x80000, REGION_GFX4, ROMREGION_DISPOSE )
	ROM_LOAD( "mab189a2.bin",  0x000000, 0x80000, CRC(e1c8b4d0) SHA1(2f8a1839cca892f8380c7cffe7a12e615d38fd55) )

	ROM_REGION( 0x80000, REGION_GFX5, ROMREGION_DISPOSE )
	ROM_LOAD( "mab289c2.bin",  0x000000, 0x80000, CRC(14f97ceb) SHA1(a22033532ea616dc3a3db8b66ad6ccc6172ed7cc) )

	ROM_REGION( 0x20000, REGION_SOUND1, 0 )
	ROM_LOAD( "ma2.bin",       0x000000, 0x20000, CRC(ea4cc30d) SHA1(d8f089fc0ce76309411706a8110ad907f93dc97e) )

	ROM_REGION( 0x20000, REGION_USER1, 0 ) /* Zoom table */
	ROM_LOAD( "ma8.bin",       0x000000, 0x10000, CRC(61f3de03) SHA1(736f9634fe054ea68a2aa90a743bd0dc320f23c9) )
	/* ma9 is identical to ma8 */
ROM_END


ROM_START( mechattu )
	ROM_REGION( 0x80000, REGION_CPU1, 0 )
	ROM_LOAD16_BYTE( "ma5u.bin",   0x000000, 0x20000, CRC(485ea606) SHA1(0c499f08d7c6d861ba7c50a8f577823613a7923c) )
	ROM_LOAD16_BYTE( "ma4u.bin",   0x000001, 0x20000, CRC(09fa31ec) SHA1(008abb2e09f83614c277471e534f20cba3e354d7) )
	ROM_LOAD16_BYTE( "ma7u.bin",   0x040000, 0x20000, CRC(f45b2c70) SHA1(65523d202d378bab890f1f7bffdde152dd246d4a) )
	ROM_LOAD16_BYTE( "ma6u.bin",   0x040001, 0x20000, CRC(d5d68ce6) SHA1(16057d882781015f6d1c7bb659e0812a8459c3f0) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )
	ROM_LOAD( "ma3.bin",       0x000000, 0x10000, CRC(c06cc8e1) SHA1(65f5f1901120d633f7c3ba07432a188fd7fd7272) )

	ROM_REGION( 0x020000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "ma1.bin",       0x000000, 0x10000, CRC(24766917) SHA1(9082a8ae849605ce65b5a0493ae69cfe282f7e7b) )

	ROM_REGION( 0x200000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD( "mao89p13.bin",  0x000000, 0x80000, CRC(8bcb16cf) SHA1(409ee1944188d9ce39adce29b1df029b560dd5b0) )
	ROM_LOAD( "ma189p15.bin",  0x080000, 0x80000, CRC(b84d9658) SHA1(448adecb0067d8f5b219ec2f94a8dec84187a554) )
	ROM_LOAD( "ma289p17.bin",  0x100000, 0x80000, CRC(6cbe08ac) SHA1(8f81f6e92b84ab6867452011d52f3e7689c62a1a) )
	ROM_LOAD( "ma389m15.bin",  0x180000, 0x80000, CRC(34d4585e) SHA1(38d9fd5d775e4b3c8b8b487a6ba9b8bdcb3274b0) )

	ROM_REGION( 0x10000, REGION_GFX3, ROMREGION_DISPOSE )
	/* Unused */

	ROM_REGION( 0x80000, REGION_GFX4, ROMREGION_DISPOSE )
	ROM_LOAD( "mab189a2.bin",  0x000000, 0x80000, CRC(e1c8b4d0) SHA1(2f8a1839cca892f8380c7cffe7a12e615d38fd55) )

	ROM_REGION( 0x80000, REGION_GFX5, ROMREGION_DISPOSE )
	ROM_LOAD( "mab289c2.bin",  0x000000, 0x80000, CRC(14f97ceb) SHA1(a22033532ea616dc3a3db8b66ad6ccc6172ed7cc) )

	ROM_REGION( 0x20000, REGION_SOUND1, 0 )
	ROM_LOAD( "ma2.bin",       0x000000, 0x20000, CRC(ea4cc30d) SHA1(d8f089fc0ce76309411706a8110ad907f93dc97e) )

	ROM_REGION( 0x20000, REGION_USER1, 0 ) /* Zoom table */
	ROM_LOAD( "ma8.bin",       0x000000, 0x10000, CRC(61f3de03) SHA1(736f9634fe054ea68a2aa90a743bd0dc320f23c9) )
	/* ma9 is identical to ma8 */
ROM_END


#if 0
static void bbusters_patch_code(UINT16 offset)
{
	/* To avoid checksum error */
	UINT16 *RAM = (UINT16 *)memory_region(REGION_CPU1);
	RAM[(offset +  0)/2] = 0x4e71;
	RAM[(offset +  2)/2] = 0x4e71;
	RAM[(offset + 10)/2] = 0x4e71;
	RAM[(offset + 12)/2] = 0x4e71;
	RAM[(offset + 20)/2] = 0x4e71;
	RAM[(offset + 22)/2] = 0x4e71;
	RAM[(offset + 30)/2] = 0x4e71;
	RAM[(offset + 32)/2] = 0x4e71;
}
#endif

static DRIVER_INIT( bbusters )
{
	#if BBUSTERS_HACK
	bbusters_patch_code(0x00234c);
	#endif
}

static DRIVER_INIT( mechatt )
{
	#if MECHATT_HACK
	bbusters_patch_code(0x003306);
	#endif
}

/******************************************************************************/

#if !MECHATT_HACK
GAME( 1989, bbusters, 0, bbusters, bbusters, bbusters, ROT0,  "SNK", "Beast Busters (World ?)", 0 )
#else
GAME( 1989, bbusters, 0, bbusters, bbusters, bbusters, ROT0,  "SNK", "Beast Busters", 0 )
#endif
#if !MECHATT_HACK
GAME( 1989, mechatt,  0, mechatt,  mechatt,  mechatt,  ROT0,  "SNK", "Mechanized Attack (World)", 0 )
#else
GAME( 1989, mechatt,  0, mechatt,  mechatt,  mechatt,  ROT0,  "SNK", "Mechanized Attack", 0 )
#endif
GAME( 1989, mechattu, mechatt, mechatt,  mechatt,  mechatt,  ROT0,  "SNK", "Mechanized Attack (US)", 0 )
