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

                            -= American Speedway =-

                    driver by   Luca Elia (l.elia@tin.it)


CPU  :  Z80A x 2
Sound:  YM2151


(c)1987 Enerdyne Technologies, Inc. / PGD

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

#include "driver.h"
#include "sound/2151intf.h"

/* Variables & functions defined in video: */

WRITE8_HANDLER( amspdwy_videoram_w );
WRITE8_HANDLER( amspdwy_colorram_w );
WRITE8_HANDLER( amspdwy_paletteram_w );
WRITE8_HANDLER( amspdwy_flipscreen_w );

VIDEO_START( amspdwy );
VIDEO_UPDATE( amspdwy );


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


                                    Main CPU


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

/*
    765-----    Buttons
    ---4----    Sgn(Wheel Delta)
    ----3210    Abs(Wheel Delta)

    Or last value when wheel delta = 0
*/
#define AMSPDWY_WHEEL_R( _n_ ) \
READ8_HANDLER( amspdwy_wheel_##_n_##_r ) \
{ \
	static UINT8 wheel_old, ret; \
	UINT8 wheel = readinputport(5 + _n_); \
	if (wheel != wheel_old) \
	{ \
		wheel = (wheel & 0x7fff) - (wheel & 0x8000); \
		if (wheel > wheel_old)	ret = ((+wheel) & 0xf) | 0x00; \
		else					ret = ((-wheel) & 0xf) | 0x10; \
		wheel_old = wheel; \
	} \
	return ret | readinputport(2 + _n_); \
}
AMSPDWY_WHEEL_R( 0 )
AMSPDWY_WHEEL_R( 1 )


READ8_HANDLER( amspdwy_sound_r )
{
	return (YM2151_status_port_0_r(0) & ~ 0x30) | readinputport(4);
}

WRITE8_HANDLER( amspdwy_sound_w )
{
	soundlatch_w(0,data);
	cpunum_set_input_line(1, INPUT_LINE_NMI, PULSE_LINE);
}

static ADDRESS_MAP_START( amspdwy_readmem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_READ(MRA8_ROM				)	// ROM
//  AM_RANGE(0x8000, 0x801f) AM_READ(MRA8_RAM               )   // Palette
	AM_RANGE(0x9000, 0x93ff) AM_READ(videoram_r			)	// Layer
	AM_RANGE(0x9400, 0x97ff) AM_READ(videoram_r			)	// Mirror?
	AM_RANGE(0x9800, 0x9bff) AM_READ(colorram_r			)	// Layer
	AM_RANGE(0x9c00, 0x9fff) AM_READ(MRA8_RAM				)	// Unused?
	AM_RANGE(0xa000, 0xa000) AM_READ(input_port_0_r		)	// DSW 1
	AM_RANGE(0xa400, 0xa400) AM_READ(input_port_1_r		)	// DSW 2
	AM_RANGE(0xa800, 0xa800) AM_READ(amspdwy_wheel_0_r		)	// Player 1
	AM_RANGE(0xac00, 0xac00) AM_READ(amspdwy_wheel_1_r		)	// Player 2
	AM_RANGE(0xb400, 0xb400) AM_READ(amspdwy_sound_r		)	// YM2151 Status + Buttons
	AM_RANGE(0xc000, 0xc0ff) AM_READ(MRA8_RAM				)	// Sprites
	AM_RANGE(0xe000, 0xe7ff) AM_READ(MRA8_RAM				)	// Work RAM
ADDRESS_MAP_END

static ADDRESS_MAP_START( amspdwy_writemem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_WRITE(MWA8_ROM							)	// ROM
	AM_RANGE(0x8000, 0x801f) AM_WRITE(amspdwy_paletteram_w) AM_BASE(&paletteram	)	// Palette
	AM_RANGE(0x9000, 0x93ff) AM_WRITE(amspdwy_videoram_w) AM_BASE(&videoram		)	// Layer
	AM_RANGE(0x9400, 0x97ff) AM_WRITE(amspdwy_videoram_w				)	// Mirror?
	AM_RANGE(0x9800, 0x9bff) AM_WRITE(amspdwy_colorram_w) AM_BASE(&colorram		)	// Layer
	AM_RANGE(0x9c00, 0x9fff) AM_WRITE(MWA8_RAM							)	// Unused?
//  AM_RANGE(0xa000, 0xa000) AM_WRITE(MWA8_NOP                          )   // ?
	AM_RANGE(0xa400, 0xa400) AM_WRITE(amspdwy_flipscreen_w				)	// Toggle Flip Screen?
	AM_RANGE(0xb000, 0xb000) AM_WRITE(MWA8_NOP							)	// ? Exiting IRQ
	AM_RANGE(0xb400, 0xb400) AM_WRITE(amspdwy_sound_w					)	// To Sound CPU
	AM_RANGE(0xc000, 0xc0ff) AM_WRITE(MWA8_RAM) AM_BASE(&spriteram) AM_SIZE(&spriteram_size	)	// Sprites
	AM_RANGE(0xe000, 0xe7ff) AM_WRITE(MWA8_RAM							)	// Work RAM
ADDRESS_MAP_END


READ8_HANDLER( amspdwy_port_r )
{
	UINT8 *Tracks = memory_region(REGION_CPU1)+0x10000;
	return Tracks[offset];
}

static ADDRESS_MAP_START( amspdwy_readport, ADDRESS_SPACE_IO, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_READ(amspdwy_port_r	)
ADDRESS_MAP_END



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


                                Sound CPU


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

static ADDRESS_MAP_START( amspdwy_sound_readmem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_READ(MRA8_ROM					)	// ROM
	AM_RANGE(0x9000, 0x9000) AM_READ(soundlatch_r				)	// From Main CPU
	AM_RANGE(0xc000, 0xdfff) AM_READ(MRA8_RAM					)	// Work RAM
	AM_RANGE(0xffff, 0xffff) AM_READ(MRA8_NOP					)	// ??? IY = FFFF at the start ?
ADDRESS_MAP_END

static ADDRESS_MAP_START( amspdwy_sound_writemem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_WRITE(MWA8_ROM					)	// ROM
//  AM_RANGE(0x8000, 0x8000) AM_WRITE(MWA8_NOP                  )   // ? Written with 0 at the start
	AM_RANGE(0xa000, 0xa000) AM_WRITE(YM2151_register_port_0_w	)	// YM2151
	AM_RANGE(0xa001, 0xa001) AM_WRITE(YM2151_data_port_0_w		)	//
	AM_RANGE(0xc000, 0xdfff) AM_WRITE(MWA8_RAM					)	// Work RAM
ADDRESS_MAP_END




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


                                Input Ports


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

INPUT_PORTS_START( amspdwy )

	PORT_START_TAG("DSW1")
	PORT_DIPNAME( 0x01, 0x00, "Character Test" )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x01, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x00, "Show Arrows" )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x02, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x04, DEF_STR( On ) )
	PORT_SERVICE( 0x08, IP_ACTIVE_HIGH )
	PORT_DIPNAME( 0x10, 0x00, "Steering Test" )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x10, DEF_STR( On ) )
	PORT_BIT(     0xe0, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START_TAG("DSW2")
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Coinage ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ) )
//  PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( 1C_2C ) )
	PORT_DIPNAME( 0x0c, 0x00, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Normal ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Hard ) )
	PORT_DIPSETTING(    0x0c, DEF_STR( Hardest ) )
	PORT_DIPNAME( 0x10, 0x00, "Time" )
	PORT_DIPSETTING(    0x10, "45 sec" )
	PORT_DIPSETTING(    0x00, "60 sec" )
	PORT_BIT(     0xe0, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START_TAG("IN2")	// Player 1 Wheel + Coins
	PORT_BIT( 0x1f, IP_ACTIVE_HIGH, IPT_SPECIAL )	// wheel
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_COIN1 ) PORT_IMPULSE(2)	// 2-3f

	PORT_START_TAG("IN3")	// Player 2 Wheel + Coins
	PORT_BIT( 0x1f, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_COIN2 ) PORT_IMPULSE(2)

	PORT_START_TAG("IN4")	// Player 1&2 Pedals + YM2151 Sound Status
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0xc0, IP_ACTIVE_HIGH, IPT_SPECIAL )

	PORT_START_TAG("IN5")	// Player 1 Analog Fake Port
	PORT_BIT( 0xffff, 0x0000, IPT_DIAL ) PORT_SENSITIVITY(15) PORT_KEYDELTA(20) PORT_CODE_DEC(KEYCODE_LEFT) PORT_CODE_INC(KEYCODE_RIGHT) PORT_PLAYER(1)

	PORT_START_TAG("IN6")	// Player 2 Analog Fake Port
	PORT_BIT( 0xffff, 0x0000, IPT_DIAL ) PORT_SENSITIVITY(15) PORT_KEYDELTA(20) PORT_CODE_DEC(KEYCODE_D) PORT_CODE_INC(KEYCODE_G) PORT_PLAYER(2)

INPUT_PORTS_END




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


                                Graphics Layouts


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

static const gfx_layout layout_8x8x2 =
{
	8,8,
	RGN_FRAC(1,2),
	2,
	{ RGN_FRAC(0,2), RGN_FRAC(1,2) },
	{ STEP8(0,1) },
	{ STEP8(0,8) },
	8*8
};

static const gfx_decode amspdwy_gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0, &layout_8x8x2,   0, 8 }, // [0] Layer & Sprites
	{ -1 }
};



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


                                Machine Drivers


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


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

static struct YM2151interface amspdwy_ym2151_interface =
{
	irq_handler
};


static MACHINE_DRIVER_START( amspdwy )

	/* basic machine hardware */
	MDRV_CPU_ADD(Z80,3000000)
	MDRV_CPU_PROGRAM_MAP(amspdwy_readmem,amspdwy_writemem)
	MDRV_CPU_IO_MAP(amspdwy_readport,0)
	MDRV_CPU_VBLANK_INT(irq0_line_hold,1)	/* IRQ: 60Hz, NMI: retn */

	MDRV_CPU_ADD(Z80,3000000)	/* Can't be disabled: the YM2151 timers must work */
	MDRV_CPU_PROGRAM_MAP(amspdwy_sound_readmem,amspdwy_sound_writemem)

	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(DEFAULT_60HZ_VBLANK_DURATION)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(256, 256)
	MDRV_SCREEN_VISIBLE_AREA(0, 256-1, 0+16, 256-16-1)
	MDRV_GFXDECODE(amspdwy_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(32)

	MDRV_VIDEO_START(amspdwy)
	MDRV_VIDEO_UPDATE(amspdwy)

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

	MDRV_SOUND_ADD(YM2151, 3000000)
	MDRV_SOUND_CONFIG(amspdwy_ym2151_interface)
	MDRV_SOUND_ROUTE(0, "left", 1.0)
	MDRV_SOUND_ROUTE(1, "right", 1.0)
MACHINE_DRIVER_END




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


                                ROMs Loading


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



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

                            American Speedway

USES TWO Z80 CPU'S W/YM2151 SOUND
THE NUMBERS WITH THE NAMES ARE PROBABLY CHECKSUMS

NAME    LOCATION    TYPE
------------------------
AUDI9363 U2         27256   CONN BD
GAME5807 U33         "       "
TRKS6092 U34         "       "
HIHIE12A 4A         2732    REAR BD
HILO9B3C 5A          "       "
LOHI4644 2A          "       "
LOLO1D51 1A          "       "

                        American Speedway (Set 2)

1987 Enerdyne Technologies, Inc. Has Rev 4 PGD written on the top board.

Processors
------------------
Dual Z80As
YM2151     (sound)

RAM
------------------
12 2114
5  82S16N

Eproms
==================

Name        Loc   TYpe   Checksum
----------  ----  -----  --------
Game.u22    U33   27256  A222
Tracks.u34  U34   27256  6092
Audio.U02   U2    27256  9363
LOLO1.1A    1A    2732   1D51
LOHI.2A     2A    2732   4644
HIHI.4A     3/4A  2732   E12A
HILO.5A     5A    2732   9B3C

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

ROM_START( amspdwy )
	ROM_REGION( 0x18000, REGION_CPU1, 0 )		/* Main Z80 Code */
	ROM_LOAD( "game5807.u33", 0x00000, 0x8000, CRC(88233b59) SHA1(bfdf10dde1731cde5c579a9a5173cafe9295a80c) )
	ROM_LOAD( "trks6092.u34", 0x10000, 0x8000, CRC(74a4e7b7) SHA1(b4f6e3faaf048351c6671205f52378a64b81bcb1) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )		/* Sound Z80 Code */
	ROM_LOAD( "audi9463.u2", 0x00000, 0x8000, CRC(61b0467e) SHA1(74509e7712838dd760919893aeda9241d308d0c3) )

	ROM_REGION( 0x4000, REGION_GFX1, ROMREGION_DISPOSE )	/* Layer + Sprites */
	ROM_LOAD( "hilo9b3c.5a", 0x0000, 0x1000, CRC(f50f864c) SHA1(5b2412c1558b30a04523fcdf1d5cf6fdae1ba88d) )
	ROM_LOAD( "hihie12a.4a", 0x1000, 0x1000, CRC(3d7497f3) SHA1(34820ba42d9c9dab1d6fdda15795450ce08392c1) )
	ROM_LOAD( "lolo1d51.1a", 0x2000, 0x1000, CRC(58701c1c) SHA1(67b476e697652a6b684bd76ae6c0078ed4b3e3a2) )
	ROM_LOAD( "lohi4644.2a", 0x3000, 0x1000, CRC(a1d802b1) SHA1(1249ce406b1aa518885a02ab063fa14906ccec2e) )
ROM_END

ROM_START( amspdwya )
	ROM_REGION( 0x18000, REGION_CPU1, 0 )		/* Main Z80 Code */
	ROM_LOAD( "game.u33",     0x00000, 0x8000, CRC(facab102) SHA1(e232969eaaad8b89ac8e28ee0a7996107a7de9a2) )
	ROM_LOAD( "trks6092.u34", 0x10000, 0x8000, CRC(74a4e7b7) SHA1(b4f6e3faaf048351c6671205f52378a64b81bcb1) )

	ROM_REGION( 0x10000, REGION_CPU2, 0 )		/* Sound Z80 Code */
	ROM_LOAD( "audi9463.u2", 0x00000, 0x8000, CRC(61b0467e) SHA1(74509e7712838dd760919893aeda9241d308d0c3) )

	ROM_REGION( 0x4000, REGION_GFX1, ROMREGION_DISPOSE )	/* Layer + Sprites */
	ROM_LOAD( "hilo9b3c.5a", 0x0000, 0x1000, CRC(f50f864c) SHA1(5b2412c1558b30a04523fcdf1d5cf6fdae1ba88d) )
	ROM_LOAD( "hihie12a.4a", 0x1000, 0x1000, CRC(3d7497f3) SHA1(34820ba42d9c9dab1d6fdda15795450ce08392c1) )
	ROM_LOAD( "lolo1d51.1a", 0x2000, 0x1000, CRC(58701c1c) SHA1(67b476e697652a6b684bd76ae6c0078ed4b3e3a2) )
	ROM_LOAD( "lohi4644.2a", 0x3000, 0x1000, CRC(a1d802b1) SHA1(1249ce406b1aa518885a02ab063fa14906ccec2e) )
ROM_END


/* (C) 1987 ETI 8402 MAGNOLIA ST. #C SANTEE, CA 92071 */

GAME( 1987, amspdwy,  0,       amspdwy, amspdwy, 0, ROT0, "Enerdyne Technologies, Inc.", "American Speedway (set 1)", 0 )
GAME( 1987, amspdwya, amspdwy, amspdwy, amspdwy, 0, ROT0, "Enerdyne Technologies, Inc.", "American Speedway (set 2)", 0 )
