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

Atari Sprint 4 driver

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

#include "driver.h"
#include "audio/sprint4.h"

#define MASTER_CLOCK    12096000

#define HTOTAL 384
#define VTOTAL 262

#define PIXEL_CLOCK    (MASTER_CLOCK / 2)


extern PALETTE_INIT( sprint4 );

extern VIDEO_EOF( sprint4 );
extern VIDEO_START( sprint4 );
extern VIDEO_UPDATE( sprint4 );

extern int sprint4_collision[4];

extern WRITE8_HANDLER( sprint4_video_ram_w );

static int da_latch;

static int steer_FF1[4];
static int steer_FF2[4];

static int gear[4];


static UINT32 get_lever(void* param)
{
	int n = (FPTR) param;

	return 4 * gear[n] > da_latch;
}


static UINT32 get_wheel(void* param)
{
	int n = (FPTR) param;

	return 8 * steer_FF1[n] + 8 * steer_FF2[n] > da_latch;
}


static UINT32 get_collision(void *param)
{
	int n = (FPTR) param;

	return sprint4_collision[n];
}


static TIMER_CALLBACK( nmi_callback	)
{
	int scanline = param;
	static UINT8 last_wheel[4];

	/* MAME updates controls only once per frame but the game checks them on every NMI */

	UINT8 wheel[4] =
	{
		readinputportbytag("WHEEL1"),
		readinputportbytag("WHEEL2"),
		readinputportbytag("WHEEL3"),
		readinputportbytag("WHEEL4")
	};
	UINT8 lever[4] =
	{
		readinputportbytag("LEVER1"),
		readinputportbytag("LEVER2"),
		readinputportbytag("LEVER3"),
		readinputportbytag("LEVER4")
	};

	int i;

	/* emulation of steering wheels isn't very accurate */

	for (i = 0; i < 4; i++)
	{
		signed char delta = wheel[i] - last_wheel[i];

		if (delta < 0)
		{
			steer_FF2[i] = 0;
		}
		if (delta > 0)
		{
			steer_FF2[i] = 1;
		}

		steer_FF1[i] = (wheel[i] >> 4) & 1;

		if (lever[i] & 1) { gear[i] = 1; }
		if (lever[i] & 2) { gear[i] = 2; }
		if (lever[i] & 4) { gear[i] = 3; }
		if (lever[i] & 8) { gear[i] = 4; }

		last_wheel[i] = wheel[i];
	}

	scanline += 64;

	if (scanline >= VTOTAL)
	{
		scanline = 32;
	}

	/* NMI and watchdog are disabled during service mode */

	watchdog_enable(readinputport(0) & 0x40);

	if (readinputport(0) & 0x40)
	{
		cpunum_set_input_line(0, INPUT_LINE_NMI, PULSE_LINE);
	}

	timer_set(video_screen_get_time_until_pos(0, scanline, 0), NULL, scanline, nmi_callback);
}


static MACHINE_RESET( sprint4 )
{
	timer_set(video_screen_get_time_until_pos(0, 32, 0), NULL, 32, nmi_callback);

	memset(steer_FF1, 0, sizeof steer_FF1);
	memset(steer_FF2, 0, sizeof steer_FF2);

	gear[0] = 1;
	gear[1] = 1;
	gear[2] = 1;
	gear[3] = 1;

	da_latch = 0;
}


static READ8_HANDLER( sprint4_wram_r )
{
	return videoram[0x380 + offset];
}


static READ8_HANDLER( sprint4_analog_r )
{
	return (readinputportbytag("ANALOG") << (~offset & 7)) & 0x80;
}
static READ8_HANDLER( sprint4_coin_r )
{
	return (readinputportbytag("COIN") << (~offset & 7)) & 0x80;
}
static READ8_HANDLER( sprint4_collision_r )
{
	return (readinputportbytag("COLLISION") << (~offset & 7)) & 0x80;
}


static READ8_HANDLER( sprint4_options_r )
{
	return (readinputportbytag("DIP") >> (2 * (offset & 3))) & 3;
}


static WRITE8_HANDLER( sprint4_wram_w )
{
	videoram[0x380 + offset] = data;
}


static WRITE8_HANDLER( sprint4_collision_reset_w )
{
	sprint4_collision[(offset >> 1) & 3] = 0;
}


static WRITE8_HANDLER( sprint4_da_latch_w )
{
	da_latch = data & 15;
}


static WRITE8_HANDLER( sprint4_lamp_w )
{
	set_led_status((offset >> 1) & 3, offset & 1);
}


#ifdef UNUSED_FUNCTION
static WRITE8_HANDLER( sprint4_lockout_w )
{
	coin_lockout_global_w(~offset & 1);
}
#endif


static WRITE8_HANDLER( sprint4_screech_1_w )
{
	discrete_sound_w(SPRINT4_SCREECH_EN_1, offset & 1);
}


static WRITE8_HANDLER( sprint4_screech_2_w )
{
	discrete_sound_w(SPRINT4_SCREECH_EN_2, offset & 1);
}


static WRITE8_HANDLER( sprint4_screech_3_w )
{
	discrete_sound_w(SPRINT4_SCREECH_EN_3, offset & 1);
}


static WRITE8_HANDLER( sprint4_screech_4_w )
{
	discrete_sound_w(SPRINT4_SCREECH_EN_4, offset & 1);
}




static WRITE8_HANDLER( sprint4_bang_w )
{
	discrete_sound_w(SPRINT4_BANG_DATA, data & 0x0f);
}


static WRITE8_HANDLER( sprint4_attract_w )
{
	discrete_sound_w(SPRINT4_ATTRACT_EN, data & 1);
}


static ADDRESS_MAP_START( sprint4_cpu_map, ADDRESS_SPACE_PROGRAM, 8 )

	ADDRESS_MAP_FLAGS( AMEF_ABITS(14) )

	AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x700) AM_READWRITE(sprint4_wram_r, sprint4_wram_w)
	AM_RANGE(0x0800, 0x0bff) AM_MIRROR(0x400) AM_READWRITE(MRA8_RAM, sprint4_video_ram_w) AM_BASE(&videoram)

	AM_RANGE(0x0000, 0x0007) AM_MIRROR(0x718) AM_READ(sprint4_analog_r)
	AM_RANGE(0x0020, 0x0027) AM_MIRROR(0x718) AM_READ(sprint4_coin_r)
	AM_RANGE(0x0040, 0x0047) AM_MIRROR(0x718) AM_READ(sprint4_collision_r)
	AM_RANGE(0x0060, 0x0063) AM_MIRROR(0x71c) AM_READ(sprint4_options_r)

	AM_RANGE(0x1000, 0x17ff) AM_READ(input_port_0_r)
	AM_RANGE(0x1800, 0x1fff) AM_READ(input_port_1_r)

	AM_RANGE(0x0000, 0x0000) AM_MIRROR(0x71f) AM_WRITE(sprint4_attract_w)
	AM_RANGE(0x0020, 0x0027) AM_MIRROR(0x718) AM_WRITE(sprint4_collision_reset_w)
	AM_RANGE(0x0040, 0x0041) AM_MIRROR(0x718) AM_WRITE(sprint4_da_latch_w)
	AM_RANGE(0x0042, 0x0043) AM_MIRROR(0x718) AM_WRITE(sprint4_bang_w)
	AM_RANGE(0x0044, 0x0045) AM_MIRROR(0x718) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x0060, 0x0067) AM_MIRROR(0x710) AM_WRITE(sprint4_lamp_w)
	AM_RANGE(0x0068, 0x0069) AM_MIRROR(0x710) AM_WRITE(sprint4_screech_1_w)
	AM_RANGE(0x006a, 0x006b) AM_MIRROR(0x710) AM_WRITE(sprint4_screech_2_w)
	AM_RANGE(0x006c, 0x006d) AM_MIRROR(0x710) AM_WRITE(sprint4_screech_3_w)
	AM_RANGE(0x006e, 0x006f) AM_MIRROR(0x710) AM_WRITE(sprint4_screech_4_w)

	AM_RANGE(0x2000, 0x27ff) AM_NOP /* diagnostic ROM */
	AM_RANGE(0x2800, 0x3fff) AM_ROM

ADDRESS_MAP_END


static INPUT_PORTS_START( sprint4 )

	PORT_START_TAG("IN0")
	PORT_SERVICE( 0x40, IP_ACTIVE_LOW )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_VBLANK )

	PORT_START_TAG("IN1")
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("Track Select") PORT_CODE(KEYCODE_SPACE)

	PORT_START_TAG("COLLISION")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 1 Gas") PORT_PLAYER(1)
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_collision, 0 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 2 Gas") PORT_PLAYER(2)
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_collision, 1 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 3 Gas") PORT_PLAYER(3)
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_collision, 2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 4 Gas") PORT_PLAYER(4)
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_collision, 3 )

	PORT_START_TAG("COIN")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START3 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN4 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START4 )

	PORT_START_TAG("DIP")
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Language )) PORT_DIPLOCATION("DIP:8,7")
	PORT_DIPSETTING(    0x00, DEF_STR( German ))
	PORT_DIPSETTING(    0x01, DEF_STR( French ))
	PORT_DIPSETTING(    0x02, DEF_STR( Spanish ))
	PORT_DIPSETTING(    0x03, DEF_STR( English ))
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Coinage )) PORT_DIPLOCATION("DIP:6")
	PORT_DIPSETTING(    0x00, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(    0x04, DEF_STR( 1C_1C ))
	PORT_DIPNAME( 0x08, 0x08, "Allow Late Entry" ) PORT_DIPLOCATION("DIP:5")
	PORT_DIPSETTING(    0x08, DEF_STR( No ))
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ))
	PORT_DIPNAME( 0xf0, 0xb0, "Play Time" ) PORT_DIPLOCATION("DIP:4,3,2,1")
	PORT_DIPSETTING(    0x70, "60 seconds" )
	PORT_DIPSETTING(    0xb0, "90 seconds" )
	PORT_DIPSETTING(    0xd0, "120 seconds" )
	PORT_DIPSETTING(    0xe0, "150 seconds" )

	PORT_START_TAG("ANALOG")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_wheel, 0)
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_lever, 0)
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_wheel, 1)
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_lever, 1)
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_wheel, 2)
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_lever, 2)
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_wheel, 3)
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM( get_lever, 3)

	PORT_START_TAG("WHEEL1")
	PORT_BIT( 0xff, 0x00, IPT_DIAL ) PORT_SENSITIVITY(100) PORT_KEYDELTA(16) PORT_PLAYER(1)

	PORT_START_TAG("WHEEL2")
	PORT_BIT( 0xff, 0x00, IPT_DIAL ) PORT_SENSITIVITY(100) PORT_KEYDELTA(16) PORT_PLAYER(2)

	PORT_START_TAG("WHEEL3")
	PORT_BIT( 0xff, 0x00, IPT_DIAL ) PORT_SENSITIVITY(100) PORT_KEYDELTA(16) PORT_PLAYER(3)

	PORT_START_TAG("WHEEL4")
	PORT_BIT( 0xff, 0x00, IPT_DIAL ) PORT_SENSITIVITY(100) PORT_KEYDELTA(16) PORT_PLAYER(4)

	PORT_START_TAG("LEVER1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 1 Gear 1") PORT_CODE(KEYCODE_Z) PORT_PLAYER(1)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 1 Gear 2") PORT_CODE(KEYCODE_X) PORT_PLAYER(1)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 1 Gear 3") PORT_CODE(KEYCODE_C) PORT_PLAYER(1)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 1 Gear 4") PORT_CODE(KEYCODE_V) PORT_PLAYER(1)

	PORT_START_TAG("LEVER2")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 2 Gear 1") PORT_CODE(KEYCODE_Q) PORT_PLAYER(2)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 2 Gear 2") PORT_CODE(KEYCODE_W) PORT_PLAYER(2)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 2 Gear 3") PORT_CODE(KEYCODE_E) PORT_PLAYER(2)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 2 Gear 4") PORT_CODE(KEYCODE_R) PORT_PLAYER(2)

	PORT_START_TAG("LEVER3")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 3 Gear 1") PORT_CODE(KEYCODE_Y) PORT_PLAYER(3)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 3 Gear 2") PORT_CODE(KEYCODE_U) PORT_PLAYER(3)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 3 Gear 3") PORT_CODE(KEYCODE_I) PORT_PLAYER(3)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 3 Gear 4") PORT_CODE(KEYCODE_O) PORT_PLAYER(3)

	PORT_START_TAG("LEVER4")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 4 Gear 1") PORT_PLAYER(3)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 4 Gear 2") PORT_PLAYER(3)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 4 Gear 3") PORT_PLAYER(3)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 4 Gear 4") PORT_PLAYER(3)

	PORT_START_TAG("MOTOR1")
	PORT_ADJUSTER( 35, "Motor 1 RPM" )

	PORT_START_TAG("MOTOR2")
	PORT_ADJUSTER( 40, "Motor 2 RPM" )

	PORT_START_TAG("MOTOR3")
	PORT_ADJUSTER( 35, "Motor 3 RPM" )

	PORT_START_TAG("MOTOR4")
	PORT_ADJUSTER( 40, "Motor 4 RPM" )

INPUT_PORTS_END


static const gfx_layout car_layout =
{
	12, 16,
	RGN_FRAC(1,3),
	1,
	{ 0 },
	{
		7 + RGN_FRAC(0,3), 6 + RGN_FRAC(0,3), 5 + RGN_FRAC(0,3), 4 + RGN_FRAC(0,3),
		7 + RGN_FRAC(1,3), 6 + RGN_FRAC(1,3), 5 + RGN_FRAC(1,3), 4 + RGN_FRAC(1,3),
		7 + RGN_FRAC(2,3), 6 + RGN_FRAC(2,3), 5 + RGN_FRAC(2,3), 4 + RGN_FRAC(2,3)
	},
	{
		0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
		0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78
	},
	0x80
};


static GFXDECODE_START( sprint4 )
	GFXDECODE_ENTRY( REGION_GFX1, 0, gfx_8x8x1, 0, 5 )
	GFXDECODE_ENTRY( REGION_GFX2, 0, car_layout, 0, 5 )
GFXDECODE_END


static MACHINE_DRIVER_START( sprint4 )

	/* basic machine hardware */
	MDRV_CPU_ADD(M6502, PIXEL_CLOCK / 8)
	MDRV_CPU_PROGRAM_MAP(sprint4_cpu_map, 0)

	MDRV_WATCHDOG_VBLANK_INIT(8)
	MDRV_MACHINE_RESET(sprint4)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_RAW_PARAMS(PIXEL_CLOCK, HTOTAL, 0, 256, VTOTAL, 0, 224)
	MDRV_GFXDECODE(sprint4)
	MDRV_PALETTE_LENGTH(6)
	MDRV_COLORTABLE_LENGTH(10)

	MDRV_PALETTE_INIT(sprint4)
	MDRV_VIDEO_START(sprint4)
	MDRV_VIDEO_UPDATE(sprint4)
	MDRV_VIDEO_EOF(sprint4)

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

	MDRV_SOUND_ADD_TAG("discrete", DISCRETE, 0)
	MDRV_SOUND_CONFIG_DISCRETE(sprint4)
	MDRV_SOUND_ROUTE(0, "left", 1.0)
	MDRV_SOUND_ROUTE(1, "right", 1.0)

MACHINE_DRIVER_END


ROM_START( sprint4 )
	ROM_REGION( 0x4000, REGION_CPU1, 0 )
	ROM_LOAD         ( "30031.c1",    0x2800, 0x0800, CRC(017ee7c4) SHA1(9386cacc619669c18af31f66691a45af6dafef64) )
	ROM_LOAD_NIB_LOW ( "30036-02.n1", 0x3000, 0x0800, CRC(883b9d7c) SHA1(af52ffdd9cd8dfed54013c9b0d3c6e48c7419d17) )
	ROM_LOAD_NIB_HIGH( "30037-02.k1", 0x3000, 0x0800, CRC(c297fbd8) SHA1(8cc0f486429e12bee21a5dd1135e799196480044) )
	ROM_LOAD         ( "30033.e1",    0x3800, 0x0800, CRC(b8b717b7) SHA1(2f6b1a0e9803901d9ba79d1f19a025f6a6134756) )

	ROM_REGION( 0x0800, REGION_GFX1, ROMREGION_DISPOSE ) /* playfield */
	ROM_LOAD( "30027.h5", 0x0000, 0x0800, CRC(3a752e07) SHA1(d990f94b296409d47e8bada98ddbed5f76567e1b) )

	ROM_REGION( 0x0c00, REGION_GFX2, ROMREGION_DISPOSE ) /* motion */
	ROM_LOAD( "30028-01.n6", 0x0000, 0x0400, CRC(3ebcb13f) SHA1(e0b87239081f12f6613d3db6a8cb5b80937df7d7) )
	ROM_LOAD( "30029-01.m6", 0x0400, 0x0400, CRC(963a8424) SHA1(d52a0e73c54154531e825153012687bdb85e479a) )
	ROM_LOAD( "30030-01.l6", 0x0800, 0x0400, CRC(e94dfc2d) SHA1(9c5b1401c4aadda0a3aee76e4f92e73ae1d35cb7) )

	ROM_REGION( 0x0200, REGION_USER1, 0 )
	ROM_LOAD( "30024-01.p8", 0x0000, 0x0200, CRC(e71d2e22) SHA1(434c3a8237468604cce7feb40e6061d2670013b3) )	/* SYNC */
ROM_END


ROM_START( sprint4a )
	ROM_REGION( 0x4000, REGION_CPU1, 0 )
	ROM_LOAD         ( "30031.c1",    0x2800, 0x0800, CRC(017ee7c4) SHA1(9386cacc619669c18af31f66691a45af6dafef64) )
	ROM_LOAD_NIB_LOW ( "30036-02.n1", 0x3000, 0x0800, CRC(883b9d7c) SHA1(af52ffdd9cd8dfed54013c9b0d3c6e48c7419d17) )
	ROM_LOAD_NIB_HIGH( "30037-02.k1", 0x3000, 0x0800, CRC(c297fbd8) SHA1(8cc0f486429e12bee21a5dd1135e799196480044) )
	ROM_LOAD         ( "30033.e1",    0x3800, 0x0800, CRC(b8b717b7) SHA1(2f6b1a0e9803901d9ba79d1f19a025f6a6134756) )

	ROM_REGION( 0x0800, REGION_GFX1, ROMREGION_DISPOSE ) /* playfield */
	ROM_LOAD( "30027.h5", 0x0000, 0x0800, CRC(3a752e07) SHA1(d990f94b296409d47e8bada98ddbed5f76567e1b) )

	ROM_REGION( 0x0c00, REGION_GFX2, ROMREGION_DISPOSE ) /* motion */
	ROM_LOAD( "30028-03.n6", 0x0000, 0x0400, CRC(d3337030) SHA1(3e73fc45bdcaa52dc1aa01489b46240284562ab7) )
	ROM_LOAD( "30029-03.m6", 0x0400, 0x0400, NO_DUMP )
	ROM_LOAD( "30030-03.l6", 0x0800, 0x0400, CRC(aa1b45ab) SHA1(1ddb64d4ec92a1383866daaefa556499837decd1) )

	ROM_REGION( 0x0200, REGION_USER1, 0 )
	ROM_LOAD( "30024-01.p8", 0x0000, 0x0200, CRC(e71d2e22) SHA1(434c3a8237468604cce7feb40e6061d2670013b3) )	/* SYNC */
ROM_END


GAME( 1977, sprint4,  0,       sprint4,  sprint4,  0, ROT180, "Atari", "Sprint 4 (set 1)", 0 ) /* large cars */
GAME( 1977, sprint4a, sprint4, sprint4,  sprint4,  0, ROT180, "Atari", "Sprint 4 (set 2)", 0 ) /* small cars */
