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

    Gunbuster                           (c) 1992 Taito

    Driver by Bryan McPhail & David Graves.

    Board Info:

        CPU   : 68EC020 68000
        SOUND : Ensoniq
        OSC.  : 40.000MHz 16.000MHz 30.47618MHz

        * This board (K11J0717A) uses following chips:
          - TC0470LIN
          - TC0480SCP
          - TC0570SPC
          - TC0260DAR
          - TC0510NIO

    Gunbuster uses a slightly enhanced sprite system from the one
    in Taito Z games.

    The key feature remains the use of a sprite map rom which allows
    the sprite hardware to create many large zoomed sprites on screen
    while minimizing the main cpu load.

    This feature makes the SZ system complementary to the F3 system
    which, owing to its F2 sprite hardware, is not very well suited to
    3d games. (Taito abandoned the SZ system once better 3d hardware
    platforms were available in the mid 1990s.)

    Gunbuster also uses the TC0480SCP tilemap chip (like the last Taito
    Z game, Double Axle).

    Todo:

        FLIPX support in taitoic.c is not quite correct - the Taito logo is wrong,
        and the floor in the Doom levels has horizontal scrolling where it shouldn't.

        No networked machine support

        Coin lockout not working (see gunbustr_input_w): perhaps this
        was a prototype version without proper coin handling?

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

#include "driver.h"
#include "cpu/m68000/m68000.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/taitoic.h"
#include "sndhrdw/taitosnd.h"
#include "machine/eeprom.h"
#include "sound/es5506.h"

VIDEO_START( gunbustr );
VIDEO_UPDATE( gunbustr );

static UINT16 coin_word;
static UINT32 *gunbustr_ram;
extern UINT32 *f3_shared_ram;

/* F3 sound */
READ16_HANDLER(f3_68000_share_r);
WRITE16_HANDLER(f3_68000_share_w);
READ16_HANDLER(f3_68681_r);
WRITE16_HANDLER(f3_68681_w);
READ16_HANDLER(es5510_dsp_r);
WRITE16_HANDLER(es5510_dsp_w);
WRITE16_HANDLER(f3_volume_w);
WRITE16_HANDLER(f3_es5505_bank_w);
void f3_68681_reset(void);
extern UINT32 *f3_shared_ram;

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

static void gunbustr_interrupt5(int x)
{
	cpunum_set_input_line(0,5,HOLD_LINE);
}

static INTERRUPT_GEN( gunbustr_interrupt )
{
	timer_set(TIME_IN_CYCLES(200000-500,0),0, gunbustr_interrupt5);
	cpunum_set_input_line(0, 4, HOLD_LINE);
}

static WRITE32_HANDLER( gunbustr_palette_w )
{
	int a,r,g,b;
	COMBINE_DATA(&paletteram32[offset]);

	a = paletteram32[offset] >> 16;
	r = (a &0x7c00) >> 10;
	g = (a &0x03e0) >> 5;
	b = (a &0x001f);
	r = (r << 3) | (r >> 2);
	g = (g << 3) | (g >> 2);
	b = (b << 3) | (b >> 2);
	palette_set_color(offset*2,r,g,b);

	a = paletteram32[offset] &0xffff;
	r = (a &0x7c00) >> 10;
	g = (a &0x03e0) >> 5;
	b = (a &0x001f);
	r = (r << 3) | (r >> 2);
	g = (g << 3) | (g >> 2);
	b = (b << 3) | (b >> 2);
	palette_set_color(offset*2+1,r,g,b);
}

static READ32_HANDLER( gunbustr_input_r )
{
	switch (offset)
	{
		case 0x00:
		{
			return (input_port_0_word_r(0,0) << 16) | input_port_1_word_r(0,0) |
				  (EEPROM_read_bit() << 7);
		}

		case 0x01:
		{
			return input_port_2_word_r(0,0) | (coin_word << 16);
		}
 	}
logerror("CPU #0 PC %06x: read input %06x\n",activecpu_get_pc(),offset);

	return 0x0;
}

static WRITE32_HANDLER( gunbustr_input_w )
{

#if 0
{
char t[64];
static UINT32 mem[2];
COMBINE_DATA(&mem[offset]);

sprintf(t,"%08x %08x",mem[0],mem[1]);
ui_popup(t);
}
#endif

	switch (offset)
	{
		case 0x00:
		{
			if (ACCESSING_MSB32)	/* $400000 is watchdog */
			{
				watchdog_reset_w(0,data >> 24);
			}

			if (ACCESSING_LSB32)
			{
				EEPROM_set_clock_line((data & 0x20) ? ASSERT_LINE : CLEAR_LINE);
				EEPROM_write_bit(data & 0x40);
				EEPROM_set_cs_line((data & 0x10) ? CLEAR_LINE : ASSERT_LINE);
				return;
			}
			return;
		}

		case 0x01:
		{
			if (ACCESSING_MSB32)
			{
				/* game does not write a separate counter for coin 2!
                   It should disable both coins when 9 credits reached
                   see code $1d8a-f6... but for some reason it's not */
				coin_lockout_w(0, data & 0x01000000);
				coin_lockout_w(1, data & 0x02000000);
				coin_counter_w(0, data & 0x04000000);
				coin_counter_w(1, data & 0x04000000);
				coin_word = (data >> 16) &0xffff;
			}
/*logerror("CPU #0 PC %06x: write input %06x\n",activecpu_get_pc(),offset); */
		}
	}
}

static WRITE32_HANDLER( motor_control_w )
{
/*
    Standard value poked into MSW is 0x3c00
    (0x2000 and zero are written at startup)

    Three bits are written in test mode to test
    lamps and motors:

    ......x. ........   Hit motor
    .......x ........   Solenoid
    ........ .....x..   Hit lamp
*/
}


static READ32_HANDLER( gunbustr_gun_r )
{
	return ( input_port_3_word_r(0,0) << 24) | (input_port_4_word_r(0,0) << 16) |
		 ( input_port_5_word_r(0,0) << 8)  |  input_port_6_word_r(0,0);
}

static WRITE32_HANDLER( gunbustr_gun_w )
{
	/* 10000 cycle delay is arbitrary */
	timer_set(TIME_IN_CYCLES(10000,0),0, gunbustr_interrupt5);
}


/***********************************************************
             MEMORY STRUCTURES
***********************************************************/

static ADDRESS_MAP_START( gunbustr_readmem, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x0fffff) AM_READ(MRA32_ROM)
	AM_RANGE(0x200000, 0x21ffff) AM_READ(MRA32_RAM)	/* main CPUA ram */
	AM_RANGE(0x300000, 0x301fff) AM_READ(MRA32_RAM)	/* Sprite ram */
	AM_RANGE(0x390000, 0x3907ff) AM_READ(MRA32_RAM)	/* Sound shared ram */
	AM_RANGE(0x400000, 0x400007) AM_READ(gunbustr_input_r)
	AM_RANGE(0x500000, 0x500003) AM_READ(gunbustr_gun_r)	/* gun coord read */
	AM_RANGE(0x800000, 0x80ffff) AM_READ(TC0480SCP_long_r)
	AM_RANGE(0x830000, 0x83002f) AM_READ(TC0480SCP_ctrl_long_r)
	AM_RANGE(0x900000, 0x901fff) AM_READ(MRA32_RAM)	/* Palette ram */
	AM_RANGE(0xc00000, 0xc03fff) AM_READ(MRA32_RAM)	/* network ram ?? */
ADDRESS_MAP_END

static ADDRESS_MAP_START( gunbustr_writemem, ADDRESS_SPACE_PROGRAM, 32 )
	AM_RANGE(0x000000, 0x0fffff) AM_WRITE(MWA32_ROM)
	AM_RANGE(0x200000, 0x21ffff) AM_WRITE(MWA32_RAM) AM_BASE(&gunbustr_ram)
	AM_RANGE(0x300000, 0x301fff) AM_WRITE(MWA32_RAM) AM_BASE(&spriteram32) AM_SIZE(&spriteram_size)
	AM_RANGE(0x380000, 0x380003) AM_WRITE(motor_control_w)	/* motor, lamps etc. */
	AM_RANGE(0x390000, 0x3907ff) AM_WRITE(MWA32_RAM) AM_BASE(&f3_shared_ram)
	AM_RANGE(0x400000, 0x400007) AM_WRITE(gunbustr_input_w)	/* eerom etc. */
	AM_RANGE(0x500000, 0x500003) AM_WRITE(gunbustr_gun_w)	/* gun int request */
	AM_RANGE(0x800000, 0x80ffff) AM_WRITE(TC0480SCP_long_w)
	AM_RANGE(0x830000, 0x83002f) AM_WRITE(TC0480SCP_ctrl_long_w)
	AM_RANGE(0x900000, 0x901fff) AM_WRITE(gunbustr_palette_w) AM_BASE(&paletteram32)
	AM_RANGE(0xc00000, 0xc03fff) AM_WRITE(MWA32_RAM)	/* network ram ?? */
ADDRESS_MAP_END

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

static ADDRESS_MAP_START( sound_readmem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x03ffff) AM_READ(MRA16_RAM)
	AM_RANGE(0x140000, 0x140fff) AM_READ(f3_68000_share_r)
	AM_RANGE(0x200000, 0x20001f) AM_READ(ES5505_data_0_r)
	AM_RANGE(0x260000, 0x2601ff) AM_READ(es5510_dsp_r)
	AM_RANGE(0x280000, 0x28001f) AM_READ(f3_68681_r)
	AM_RANGE(0xc00000, 0xcfffff) AM_READ(MRA16_BANK1)
	AM_RANGE(0xff8000, 0xffffff) AM_READ(MRA16_RAM)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_writemem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x03ffff) AM_WRITE(MWA16_RAM)
	AM_RANGE(0x140000, 0x140fff) AM_WRITE(f3_68000_share_w)
	AM_RANGE(0x200000, 0x20001f) AM_WRITE(ES5505_data_0_w)
	AM_RANGE(0x260000, 0x2601ff) AM_WRITE(es5510_dsp_w)
	AM_RANGE(0x280000, 0x28001f) AM_WRITE(f3_68681_w)
	AM_RANGE(0x300000, 0x30003f) AM_WRITE(f3_es5505_bank_w)
	AM_RANGE(0x340000, 0x340003) AM_WRITE(f3_volume_w) /* 8 channel volume control */
	AM_RANGE(0xc00000, 0xcfffff) AM_WRITE(MWA16_ROM)
	AM_RANGE(0xff8000, 0xffffff) AM_WRITE(MWA16_RAM)
ADDRESS_MAP_END

/***********************************************************
             INPUT PORTS (dips in eprom)
***********************************************************/

INPUT_PORTS_START( gunbustr )
	PORT_START      /* IN0 */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0002, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0008, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0010, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0040, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0080, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0100, IP_ACTIVE_LOW,  IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0200, IP_ACTIVE_LOW,  IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0400, IP_ACTIVE_LOW,  IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x0800, IP_ACTIVE_LOW,  IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x1000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x2000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x4000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x8000, IP_ACTIVE_LOW,  IPT_UNKNOWN )

	PORT_START      /* IN1 */
	PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_PLAYER(1)	/* Freeze input */
	PORT_BIT( 0x0002, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0008, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0010, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0040, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* reserved for EEROM */
	PORT_BIT( 0x0100, IP_ACTIVE_LOW,  IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0200, IP_ACTIVE_LOW,  IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0400, IP_ACTIVE_LOW,  IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0800, IP_ACTIVE_LOW,  IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x1000, IP_ACTIVE_LOW,  IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0x2000, IP_ACTIVE_LOW,  IPT_BUTTON2 ) PORT_PLAYER(1)
	PORT_BIT( 0x4000, IP_ACTIVE_LOW,  IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x8000, IP_ACTIVE_LOW,  IPT_BUTTON2 ) PORT_PLAYER(2)

	PORT_START      /* IN2 */
	PORT_BIT(0x0001, IP_ACTIVE_LOW,  IPT_SERVICE ) PORT_NAME( DEF_STR( Service_Mode )) PORT_CODE(KEYCODE_F2)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW,  IPT_SERVICE1 )
	PORT_BIT( 0x0004, IP_ACTIVE_LOW,  IPT_COIN1 )
	PORT_BIT( 0x0008, IP_ACTIVE_LOW,  IPT_COIN2 )
	PORT_BIT( 0x0010, IP_ACTIVE_LOW,  IPT_START1 )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW,  IPT_START2 )
	PORT_BIT( 0x0040, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0080, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0100, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0200, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0400, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x0800, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x1000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x2000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x4000, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x8000, IP_ACTIVE_LOW,  IPT_UNKNOWN )

	/* Light gun inputs */

	PORT_START	/* IN 3, P1X */
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_MINMAX(0,0xff) PORT_SENSITIVITY(30) PORT_KEYDELTA(20) PORT_PLAYER(1)

	PORT_START	/* IN 4, P1Y */
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_MINMAX(0,0xff) PORT_SENSITIVITY(30) PORT_KEYDELTA(20) PORT_REVERSE PORT_PLAYER(1)

	PORT_START	/* IN 5, P2X */
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_MINMAX(0,0xff) PORT_SENSITIVITY(30) PORT_KEYDELTA(20) PORT_PLAYER(2)

	PORT_START	/* IN 6, P2Y */
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_MINMAX(0,0xff) PORT_SENSITIVITY(30) PORT_KEYDELTA(20) PORT_REVERSE PORT_PLAYER(2)
INPUT_PORTS_END


/***********************************************************
                GFX DECODING
**********************************************************/

static gfx_layout tile16x16_layout =
{
	16,16,	/* 16*16 sprites */
	RGN_FRAC(1,1),
	4,	/* 4 bits per pixel */
	{ 0, 8, 16, 24 },
	{ 32, 33, 34, 35, 36, 37, 38, 39, 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*64, 1*64,  2*64,  3*64,  4*64,  5*64,  6*64,  7*64,
	  8*64, 9*64, 10*64, 11*64, 12*64, 13*64, 14*64, 15*64 },
	64*16	/* every sprite takes 128 consecutive bytes */
};

static gfx_layout charlayout =
{
	16,16,    /* 16*16 characters */
	RGN_FRAC(1,1),
	4,        /* 4 bits per pixel */
	{ 0, 1, 2, 3 },
	{ 1*4, 0*4, 5*4, 4*4, 3*4, 2*4, 7*4, 6*4, 9*4, 8*4, 13*4, 12*4, 11*4, 10*4, 15*4, 14*4 },
	{ 0*64, 1*64, 2*64, 3*64, 4*64, 5*64, 6*64, 7*64, 8*64, 9*64, 10*64, 11*64, 12*64, 13*64, 14*64, 15*64 },
	128*8     /* every sprite takes 128 consecutive bytes */
};

static gfx_decode gunbustr_gfxdecodeinfo[] =
{
	{ REGION_GFX2, 0x0, &tile16x16_layout,  0, 512 },
	{ REGION_GFX1, 0x0, &charlayout,        0, 512 },
	{ -1 } /* end of array */
};


/***********************************************************
                 MACHINE DRIVERS
***********************************************************/

static MACHINE_INIT( gunbustr )
{
	/* Sound cpu program loads to 0xc00000 so we use a bank */
	UINT16 *RAM = (UINT16 *)memory_region(REGION_CPU2);
	memory_set_bankptr(1,&RAM[0x80000]);

	RAM[0]=RAM[0x80000]; /* Stack and Reset vectors */
	RAM[1]=RAM[0x80001];
	RAM[2]=RAM[0x80002];
	RAM[3]=RAM[0x80003];

	f3_68681_reset();
}

static struct ES5505interface es5505_interface =
{
	REGION_SOUND1,	/* Bank 0: Unused by F3 games? */
	REGION_SOUND1,	/* Bank 1: All games seem to use this */
	0				/* irq callback */
};

static UINT8 default_eeprom[128]={
	0x00,0x01,0x00,0x85,0x00,0xfd,0x00,0xff,0x00,0x67,0x00,0x02,0x00,0x00,0x00,0x7b,
	0x00,0xff,0x00,0xff,0x00,0x78,0x00,0x03,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
	0x01,0x01,0x00,0x00,0x01,0x02,0x00,0x00,0x01,0x01,0x00,0x00,0x00,0x10,0x00,0x00,
	0x21,0x13,0x14,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
	0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
	0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
	0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
	0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
};

static struct EEPROM_interface gunbustr_eeprom_interface =
{
	6,				/* address bits */
	16,				/* data bits */
	"0110",			/* read command */
	"0101",			/* write command */
	"0111",			/* erase command */
	"0100000000",	/* unlock command */
	"0100110000",	/* lock command */
};

static NVRAM_HANDLER( gunbustr )
{
	if (read_or_write)
		EEPROM_save(file);
	else {
		EEPROM_init(&gunbustr_eeprom_interface);
		if (file)
			EEPROM_load(file);
		else
			EEPROM_set_data(default_eeprom,128);  /* Default the gun setup values */
	}
}

static MACHINE_DRIVER_START( gunbustr )

	/* basic machine hardware */
	MDRV_CPU_ADD(M68EC020, 16000000)	/* 16 MHz */
	MDRV_CPU_PROGRAM_MAP(gunbustr_readmem,gunbustr_writemem)
	MDRV_CPU_VBLANK_INT(gunbustr_interrupt,1) /* VBL */

	MDRV_CPU_ADD(M68000, 16000000)
	/* audio CPU */	/* 16 MHz */
	MDRV_CPU_PROGRAM_MAP(sound_readmem,sound_writemem)

	MDRV_FRAMES_PER_SECOND(60)
	MDRV_VBLANK_DURATION(DEFAULT_60HZ_VBLANK_DURATION)

	MDRV_MACHINE_INIT(gunbustr)
	MDRV_NVRAM_HANDLER(gunbustr)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_NEEDS_6BITS_PER_GUN)
	MDRV_SCREEN_SIZE(40*8, 32*8)
	MDRV_VISIBLE_AREA(0, 40*8-1, 2*8, 32*8-1)
	MDRV_GFXDECODE(gunbustr_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(8192)

	MDRV_VIDEO_START(gunbustr)
	MDRV_VIDEO_UPDATE(gunbustr)

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

	MDRV_SOUND_ADD(ES5505, 30476100/2)
	MDRV_SOUND_CONFIG(es5505_interface)
	MDRV_SOUND_ROUTE(0, "left", 1.0)
	MDRV_SOUND_ROUTE(1, "right", 1.0)
MACHINE_DRIVER_END

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

ROM_START( gunbustr )
	ROM_REGION( 0x100000, REGION_CPU1, 0 )	/* 1024K for 68020 code (CPU A) */
	ROM_LOAD32_BYTE( "d27-23.bin", 0x00000, 0x40000, CRC(cd1037cc) SHA1(8005a6a84081ce609e7a605ec8e00e740bfc6846) )
	ROM_LOAD32_BYTE( "d27-22.bin", 0x00001, 0x40000, CRC(475949fc) SHA1(3d5aa3411d2618004902f9d05dff61d9af01ff35) )
	ROM_LOAD32_BYTE( "d27-21.bin", 0x00002, 0x40000, CRC(60950a8a) SHA1(a0336bf6970baa6eaa998a112db840a7fd0452d7) )
	ROM_LOAD32_BYTE( "d27-20.bin", 0x00003, 0x40000, CRC(13735c60) SHA1(65b762b28d51b295f6fe190420af566b1b3d4a82) )

	ROM_REGION( 0x140000, REGION_CPU2, 0 )	/* Sound cpu */
	ROM_LOAD16_BYTE( "d27-25.bin", 0x100000, 0x20000, CRC(c88203cf) SHA1(a918d395b471acdce56dacabd7a1e1e023948365) )
	ROM_LOAD16_BYTE( "d27-24.bin", 0x100001, 0x20000, CRC(084bd8bd) SHA1(93229bc7de4550ead1bb12f666ddbacbe357488d) )

	ROM_REGION( 0x100000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD16_BYTE( "d27-01.bin", 0x00000, 0x80000, CRC(f41759ce) SHA1(30789f43dd09b56399e1dfdb8c6a1e01a21562bd) )	/* SCR 16x16 tiles */
	ROM_LOAD16_BYTE( "d27-02.bin", 0x00001, 0x80000, CRC(92ab6430) SHA1(28ed80391c732b09d10c74ed6b78ac76cb62e083) )

	ROM_REGION( 0x400000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD32_BYTE( "d27-04.bin", 0x000003, 0x100000, CRC(ff8b9234) SHA1(6095b7daf9b7e9a22b0d44d9d6a642ddecb2bd29) )	/* OBJ 16x16 tiles: each rom has 1 bitplane */
	ROM_LOAD32_BYTE( "d27-05.bin", 0x000002, 0x100000, CRC(96d7c1a5) SHA1(93b6a7aea397280a5a778e736d433a85cb7da52c) )
	ROM_LOAD32_BYTE( "d27-06.bin", 0x000001, 0x100000, CRC(bbb934db) SHA1(9e9b5cf05b9275f1182f5b499b8ee897c4f25b96) )
	ROM_LOAD32_BYTE( "d27-07.bin", 0x000000, 0x100000, CRC(8ab4854e) SHA1(bd2750cdaa2918e56f8aef3732875952a1eeafea) )

	ROM_REGION16_LE( 0x80000, REGION_USER1, 0 )
	ROM_LOAD16_WORD( "d27-03.bin", 0x00000, 0x80000, CRC(23bf2000) SHA1(49b29e771a47fcd7e6cd4e2704b217f9727f8299) )	/* STY, used to create big sprites on the fly */

	ROM_REGION16_BE( 0xa00000, REGION_SOUND1 , ROMREGION_SOUNDONLY | ROMREGION_ERASE00 )
	ROM_LOAD16_BYTE( "d27-08.bin", 0x000000, 0x100000, CRC(7c147e30) SHA1(b605045154967050ec06391798da4afe3686a6e1) )
	/* 0x200000 Empty bank? */
	ROM_LOAD16_BYTE( "d27-09.bin", 0x400000, 0x100000, CRC(3e060304) SHA1(c4da4a94c168c3a454409d758c3ed45babbab170) )
	ROM_LOAD16_BYTE( "d27-10.bin", 0x600000, 0x100000, CRC(ed894fe1) SHA1(5bf2fb6abdcf25bc525a2c3b29dbf7aca0b18fea) )
ROM_END

static READ32_HANDLER( main_cycle_r )
{
	if (activecpu_get_pc()==0x55a && (gunbustr_ram[0x3acc/4]&0xff000000)==0)
		cpu_spinuntil_int();

	return gunbustr_ram[0x3acc/4];
}

static DRIVER_INIT( gunbustr )
{
	/* Speedup handler */
	memory_install_read32_handler(0, ADDRESS_SPACE_PROGRAM, 0x203acc, 0x203acf, 0, 0, main_cycle_r);
}

GAME( 1992, gunbustr, 0,      gunbustr, gunbustr, gunbustr, ORIENTATION_FLIP_X, "Taito Corporation", "Gunbuster (Japan)", 0 )
