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

  Mad Motor                             (c) 1989 Mitchell Corporation

  But it's really a Data East game..  Bad Dudes era graphics hardware with
  Dark Seal era sound hardware.  Maybe a license for a specific territory?

  "This game is developed by Mitchell, but they entrusted PCB design and some
  routines to Data East."

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

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

#include "driver.h"
#include "cpu/h6280/h6280.h"
#include "sound/2203intf.h"
#include "sound/2151intf.h"
#include "sound/okim6295.h"

VIDEO_START( madmotor );
VIDEO_UPDATE( madmotor );

READ16_HANDLER( madmotor_pf1_rowscroll_r );
WRITE16_HANDLER( madmotor_pf1_rowscroll_w );
READ16_HANDLER( madmotor_pf1_data_r );
READ16_HANDLER( madmotor_pf2_data_r );
READ16_HANDLER( madmotor_pf3_data_r );
WRITE16_HANDLER( madmotor_pf1_data_w );
WRITE16_HANDLER( madmotor_pf2_data_w );
WRITE16_HANDLER( madmotor_pf3_data_w );
WRITE16_HANDLER( madmotor_pf1_control_w );
WRITE16_HANDLER( madmotor_pf2_control_w );
WRITE16_HANDLER( madmotor_pf3_control_w );
extern UINT16 *madmotor_pf1_rowscroll;
extern UINT16 *madmotor_pf1_data,*madmotor_pf2_data,*madmotor_pf3_data;


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

static WRITE16_HANDLER( madmotor_sound_w )
{
	if (ACCESSING_LSB)
	{
		soundlatch_w(0,data & 0xff);
		cpunum_set_input_line(1,0,HOLD_LINE);
	}
}


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

static ADDRESS_MAP_START( madmotor_readmem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x07ffff) AM_READ(MRA16_ROM)
	AM_RANGE(0x184000, 0x1847ff) AM_READ(madmotor_pf1_rowscroll_r)
	AM_RANGE(0x188000, 0x189fff) AM_READ(madmotor_pf1_data_r)
	AM_RANGE(0x198000, 0x1987ff) AM_READ(madmotor_pf2_data_r)
	AM_RANGE(0x1a4000, 0x1a4fff) AM_READ(madmotor_pf3_data_r)
	AM_RANGE(0x18c000, 0x18c001) AM_READ(MRA16_NOP)
	AM_RANGE(0x19c000, 0x19c001) AM_READ(MRA16_NOP)
	AM_RANGE(0x3e0000, 0x3e3fff) AM_READ(MRA16_RAM)
	AM_RANGE(0x3e8000, 0x3e87ff) AM_READ(MRA16_RAM)
	AM_RANGE(0x3f0000, 0x3f07ff) AM_READ(MRA16_RAM)
	AM_RANGE(0x3f8002, 0x3f8003) AM_READ(input_port_0_word_r)
	AM_RANGE(0x3f8004, 0x3f8005) AM_READ(input_port_1_word_r)
	AM_RANGE(0x3f8006, 0x3f8007) AM_READ(input_port_2_word_r)
ADDRESS_MAP_END

static ADDRESS_MAP_START( madmotor_writemem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x07ffff) AM_WRITE(MWA16_ROM)
	AM_RANGE(0x180000, 0x18001f) AM_WRITE(madmotor_pf1_control_w)
	AM_RANGE(0x184000, 0x1847ff) AM_WRITE(madmotor_pf1_rowscroll_w) AM_BASE(&madmotor_pf1_rowscroll)
	AM_RANGE(0x188000, 0x189fff) AM_WRITE(madmotor_pf1_data_w) AM_BASE(&madmotor_pf1_data)
	AM_RANGE(0x18c000, 0x18c001) AM_WRITE(MWA16_NOP)
	AM_RANGE(0x190000, 0x19001f) AM_WRITE(madmotor_pf2_control_w)
	AM_RANGE(0x198000, 0x1987ff) AM_WRITE(madmotor_pf2_data_w) AM_BASE(&madmotor_pf2_data)
	AM_RANGE(0x1a0000, 0x1a001f) AM_WRITE(madmotor_pf3_control_w)
	AM_RANGE(0x1a4000, 0x1a4fff) AM_WRITE(madmotor_pf3_data_w) AM_BASE(&madmotor_pf3_data)
	AM_RANGE(0x3e0000, 0x3e3fff) AM_WRITE(MWA16_RAM)
	AM_RANGE(0x3e8000, 0x3e87ff) AM_WRITE(MWA16_RAM) AM_BASE(&spriteram16) AM_SIZE(&spriteram_size)
	AM_RANGE(0x3f0000, 0x3f07ff) AM_WRITE(paletteram16_xxxxBBBBGGGGRRRR_word_w) AM_BASE(&paletteram16)
	AM_RANGE(0x3fc004, 0x3fc005) AM_WRITE(madmotor_sound_w)
ADDRESS_MAP_END

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

static WRITE8_HANDLER( YM2151_w )
{
	switch (offset) {
	case 0:
		YM2151_register_port_0_w(0,data);
		break;
	case 1:
		YM2151_data_port_0_w(0,data);
		break;
	}
}

static WRITE8_HANDLER( YM2203_w )
{
	switch (offset) {
	case 0:
		YM2203_control_port_0_w(0,data);
		break;
	case 1:
		YM2203_write_port_0_w(0,data);
		break;
	}
}

/* Physical memory map (21 bits) */
static ADDRESS_MAP_START( sound_readmem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x000000, 0x00ffff) AM_READ(MRA8_ROM)
	AM_RANGE(0x100000, 0x100001) AM_READ(YM2203_status_port_0_r)
	AM_RANGE(0x110000, 0x110001) AM_READ(YM2151_status_port_0_r)
	AM_RANGE(0x120000, 0x120001) AM_READ(OKIM6295_status_0_r)
	AM_RANGE(0x130000, 0x130001) AM_READ(OKIM6295_status_1_r)
	AM_RANGE(0x140000, 0x140001) AM_READ(soundlatch_r)
	AM_RANGE(0x1f0000, 0x1f1fff) AM_READ(MRA8_BANK8)
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_writemem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x000000, 0x00ffff) AM_WRITE(MWA8_ROM)
	AM_RANGE(0x100000, 0x100001) AM_WRITE(YM2203_w)
	AM_RANGE(0x110000, 0x110001) AM_WRITE(YM2151_w)
	AM_RANGE(0x120000, 0x120001) AM_WRITE(OKIM6295_data_0_w)
	AM_RANGE(0x130000, 0x130001) AM_WRITE(OKIM6295_data_1_w)
	AM_RANGE(0x1f0000, 0x1f1fff) AM_WRITE(MWA8_BANK8)
	AM_RANGE(0x1fec00, 0x1fec01) AM_WRITE(H6280_timer_w)
	AM_RANGE(0x1ff400, 0x1ff403) AM_WRITE(H6280_irq_status_w)
ADDRESS_MAP_END

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

INPUT_PORTS_START( madmotor )
	PORT_START
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED )	/* button 3 - unused */
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START1 )
	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_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNUSED )	/* button 3 - unused */
	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_START2 )

	PORT_START
	PORT_DIPNAME( 0x0007, 0x0007, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(      0x0001, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(      0x0007, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(      0x0006, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(      0x0005, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(      0x0004, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(      0x0003, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(      0x0002, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x0038, 0x0038, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(      0x0008, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(      0x0038, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(      0x0030, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(      0x0028, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(      0x0020, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(      0x0018, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(      0x0010, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x0040, 0x0040, DEF_STR( Flip_Screen ) )
	PORT_DIPSETTING(      0x0040, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_DIPNAME( 0x0080, 0x0000, DEF_STR( Unknown ) )
	PORT_DIPSETTING(      0x0080, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_DIPNAME( 0x0300, 0x0300, DEF_STR( Lives ) )
	PORT_DIPSETTING(      0x0000, "2" )
	PORT_DIPSETTING(      0x0300, "3" )
	PORT_DIPSETTING(      0x0200, "4" )
	PORT_DIPSETTING(      0x0100, "5" )
	PORT_DIPNAME( 0x0c00, 0x0c00, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(      0x0800, DEF_STR( Easy ) )
	PORT_DIPSETTING(      0x0c00, DEF_STR( Normal ) )
	PORT_DIPSETTING(      0x0400, DEF_STR( Hard ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( Hardest ) )
	PORT_DIPNAME( 0x1000, 0x0000, DEF_STR( Unknown ) )
	PORT_DIPSETTING(      0x1000, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_DIPNAME( 0x2000, 0x0000, DEF_STR( Unknown ) )
	PORT_DIPSETTING(      0x2000, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_DIPNAME( 0x4000, 0x4000, DEF_STR( Allow_Continue ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( No ) )
	PORT_DIPSETTING(      0x4000, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x8000, 0x0000, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(      0x8000, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )

	PORT_START	/* Credits */
	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_HIGH, IPT_VBLANK )
	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 )
INPUT_PORTS_END

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

static const gfx_layout charlayout =
{
	8,8,	/* 8*8 chars */
	4096,
	4,		/* 4 bits per pixel  */
	{ 0x18000*8, 0x8000*8, 0x10000*8, 0x00000*8 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	8*8	/* every char takes 8 consecutive bytes */
};

static const gfx_layout tilelayout =
{
	16,16,
	2048,
	4,
	{ 0x30000*8, 0x10000*8, 0x20000*8, 0x00000*8 },
	{ 16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7,
			0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
			8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*16
};

static const gfx_layout tilelayout2 =
{
	16,16,
	4096,
	4,
	{ 0x60000*8, 0x20000*8, 0x40000*8, 0x00000*8 },
	{ 16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7,
			0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
			8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*16
};

static const gfx_layout spritelayout =
{
	16,16,
	4096*2,
	4,
	{ 0xc0000*8, 0x80000*8, 0x40000*8, 0x00000*8 },
	{ 16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7,
			0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
			8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*16
};

static const gfx_decode gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0, &charlayout,     0, 16 },	/* Characters 8x8 */
	{ REGION_GFX2, 0, &tilelayout,   512, 16 },	/* Tiles 16x16 */
	{ REGION_GFX3, 0, &tilelayout2,  768, 16 },	/* Tiles 16x16 */
	{ REGION_GFX4, 0, &spritelayout, 256, 16 },	/* Sprites 16x16 */
	{ -1 }
};

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

static void sound_irq(int state)
{
	cpunum_set_input_line(1,1,state); /* IRQ 2 */
}

static struct YM2151interface ym2151_interface =
{
	sound_irq
};

static MACHINE_DRIVER_START( madmotor )

	/* basic machine hardware */
	MDRV_CPU_ADD(M68000, 12000000) /* Custom chip 59, 24 MHz crystal */
	MDRV_CPU_PROGRAM_MAP(madmotor_readmem,madmotor_writemem)
	MDRV_CPU_VBLANK_INT(irq6_line_hold,1)/* VBL */

	MDRV_CPU_ADD(H6280, 8053000/2) /* Custom chip 45, Crystal near CPU is 8.053 MHz */
	/* audio CPU */
	MDRV_CPU_PROGRAM_MAP(sound_readmem,sound_writemem)

	MDRV_SCREEN_REFRESH_RATE(58)
	MDRV_SCREEN_VBLANK_TIME(DEFAULT_REAL_60HZ_VBLANK_DURATION /* frames per second, vblank duration taken from Burger Time */)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_UPDATE_BEFORE_VBLANK)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 1*8, 31*8-1)
	MDRV_GFXDECODE(gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(1024)

	MDRV_VIDEO_START(madmotor)
	MDRV_VIDEO_UPDATE(madmotor)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD(YM2203, 21470000/6)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)

	MDRV_SOUND_ADD(YM2151, 21470000/6)
	MDRV_SOUND_CONFIG(ym2151_interface)
	MDRV_SOUND_ROUTE(0, "mono", 0.45)
	MDRV_SOUND_ROUTE(1, "mono", 0.45)

	MDRV_SOUND_ADD(OKIM6295, 1023924)
	MDRV_SOUND_CONFIG(okim6295_interface_region_1_pin7high) // clock frequency & pin 7 not verified
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	MDRV_SOUND_ADD(OKIM6295, 2047848)
	MDRV_SOUND_CONFIG(okim6295_interface_region_2_pin7high) // clock frequency & pin 7 not verified
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
MACHINE_DRIVER_END

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

ROM_START( madmotor )
	ROM_REGION( 0x80000, REGION_CPU1, 0 ) /* 68000 code */
	ROM_LOAD16_BYTE( "02", 0x00000, 0x20000, CRC(50b554e0) SHA1(e33d0ab5464ab5ff394dd630536ac83baf0aa2c9) )
	ROM_LOAD16_BYTE( "00", 0x00001, 0x20000, CRC(2d6a1b3f) SHA1(fa7058bf907becac56ed9938c5643aaefdf7a2c0) )
	ROM_LOAD16_BYTE( "03", 0x40000, 0x20000, CRC(442a0a52) SHA1(86bb5470d5653d125481250f778c632371dddad8) )
	ROM_LOAD16_BYTE( "01", 0x40001, 0x20000, CRC(e246876e) SHA1(648dca8bab001cfb42618081bbc1efa14118743e) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )	/* Sound CPU */
	ROM_LOAD( "14",    0x00000, 0x10000, CRC(1c28a7e5) SHA1(ed30d0a5a8a079677bd34b6d98ab1b15b934b30f) )

	ROM_REGION( 0x020000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "04",    0x000000, 0x10000, CRC(833ca3ab) SHA1(7a3e7ebecc1596d2e487595369ad9ba54ced5bfb) )	/* chars */
	ROM_LOAD( "05",    0x010000, 0x10000, CRC(a691fbfe) SHA1(c726a4c15d599feb6883d9b643453e7028fa16d6) )

	ROM_REGION( 0x040000, REGION_GFX2, ROMREGION_DISPOSE )
	ROM_LOAD( "10",    0x000000, 0x20000, CRC(9dbf482b) SHA1(086e9170d577e502604c180f174fbce53a1e20e5) )	/* tiles */
	ROM_LOAD( "11",    0x020000, 0x20000, CRC(593c48a9) SHA1(1158888f6b836253b8ae9db9b8e352f289b2e815) )

	ROM_REGION( 0x080000, REGION_GFX3, ROMREGION_DISPOSE )
	ROM_LOAD( "06",    0x000000, 0x20000, CRC(448850e5) SHA1(6a44a42738cf6a55b4bec807e0a3939a42b36793) )	/* tiles */
	ROM_LOAD( "07",    0x020000, 0x20000, CRC(ede4d141) SHA1(7b847372bac043aa397aa5c274f90b9193de9176) )
	ROM_LOAD( "08",    0x040000, 0x20000, CRC(c380e5e5) SHA1(ec87a94e7948b84c96b1577f5a8caebc56e38a94) )
	ROM_LOAD( "09",    0x060000, 0x20000, CRC(1ee3326a) SHA1(bd03e5c4a2e7689260e6cc67288e71ef13f05a4b) )

	ROM_REGION( 0x100000, REGION_GFX4, ROMREGION_DISPOSE )
	ROM_LOAD( "15",    0x000000, 0x20000, CRC(90ae9f74) SHA1(806f96fd08fca1beeeaefe3c0fac1991410aa9c4) )	/* sprites */
	ROM_LOAD( "16",    0x020000, 0x20000, CRC(e96ac815) SHA1(a2b22a29ad0a4f144bb09299c454dc7a842a5318) )
	ROM_LOAD( "17",    0x040000, 0x20000, CRC(abad9a1b) SHA1(3cec6b4ef925205efe4a8fb28e08eb58e3ba4019) )
	ROM_LOAD( "18",    0x060000, 0x20000, CRC(96d8d64b) SHA1(54ce87fe2b14b574176d2a1d2b86057b9cd10883) )
	ROM_LOAD( "19",    0x080000, 0x20000, CRC(cbd8c9b8) SHA1(5e86c0298b3eea06920121eecb70e5bee705addf) )
	ROM_LOAD( "20",    0x0a0000, 0x20000, CRC(47f706a8) SHA1(bd4fe499710f8905eb4b8d1ca990f2908feb95e1) )
	ROM_LOAD( "21",    0x0c0000, 0x20000, CRC(9c72d364) SHA1(9290e463273fa1f921279f1bab808d91d3aa9648) )
	ROM_LOAD( "22",    0x0e0000, 0x20000, CRC(1e78aa60) SHA1(f5f58ee6f5efe56e72623e57ce27884551e09bd9) )

	ROM_REGION( 0x20000, REGION_SOUND1, 0 )	/* ADPCM samples */
	ROM_LOAD( "12",    0x00000, 0x20000, CRC(c202d200) SHA1(8470654923a0e8780dad678f5745f8e3e3be08b2) )

	ROM_REGION( 0x20000, REGION_SOUND2, 0 )	/* ADPCM samples */
	ROM_LOAD( "13",    0x00000, 0x20000, CRC(cc4d65e9) SHA1(b9bcaa52c570f94d2f2e5dd84c94773cc4115442) )
ROM_END

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

static DRIVER_INIT( madmotor )
{
	UINT8 *rom = memory_region(REGION_CPU1);
	int i;

	for (i = 0x00000;i < 0x80000;i++)
	{
		rom[i] = (rom[i] & 0xdb) | ((rom[i] & 0x04) << 3) | ((rom[i] & 0x20) >> 3);
		rom[i] = (rom[i] & 0x7e) | ((rom[i] & 0x01) << 7) | ((rom[i] & 0x80) >> 7);
	}
}


 /* The title screen is undated, but it's (c) 1989 Data East at 0xefa0 */
GAME( 1989, madmotor, 0, madmotor, madmotor, madmotor, ROT0, "Mitchell", "Mad Motor", 0 )
