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

                            -= 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 "cpu/z80/z80.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
*/

static UINT8 wheel_old[2];
static UINT8 wheel_return[2];

static UINT8 amspdwy_wheel_r(running_machine *machine, int index)
{
    static const char *const portnames[] = { "WHEEL1", "WHEEL2", "AN1", "AN2" };
    UINT8 wheel;
    wheel = input_port_read(machine, portnames[2 + index]);
    if (wheel != wheel_old[index])
    {
        wheel = (wheel & 0x7fff) - (wheel & 0x8000);
        if (wheel > wheel_old[index])  wheel_return[index] = ((+wheel) & 0xf) | 0x00;
        else                           wheel_return[index] = ((-wheel) & 0xf) | 0x10;
        wheel_old[index] = wheel;
    }
    return wheel_return[index] | input_port_read(machine, portnames[index]);
}

static READ8_HANDLER( amspdwy_wheel_0_r )
{
    return amspdwy_wheel_r(space->machine, 0);
}

static READ8_HANDLER( amspdwy_wheel_1_r )
{
    return amspdwy_wheel_r(space->machine, 0);
}

static READ8_DEVICE_HANDLER( amspdwy_sound_r )
{
	return (ym2151_status_port_r(device,0) & ~ 0x30) | input_port_read(device->machine, "IN0");
}

static WRITE8_HANDLER( amspdwy_sound_w )
{
	soundlatch_w(space, 0, data);
	cputag_set_input_line(space->machine, "audiocpu", INPUT_LINE_NMI, PULSE_LINE);
}

static ADDRESS_MAP_START( amspdwy_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM												// ROM
	AM_RANGE(0x8000, 0x801f) AM_WRITE(amspdwy_paletteram_w) AM_BASE(&paletteram)// Palette
	AM_RANGE(0x9000, 0x93ff) AM_MIRROR(0x0400) AM_RAM_WRITE(amspdwy_videoram_w) AM_BASE(&videoram)	// Layer, mirrored?
	AM_RANGE(0x9800, 0x9bff) AM_RAM_WRITE(amspdwy_colorram_w) AM_BASE(&colorram)	// Layer
	AM_RANGE(0x9c00, 0x9fff) AM_RAM												// Unused?
//  AM_RANGE(0xa000, 0xa000) AM_WRITENOP                                        // ?
	AM_RANGE(0xa000, 0xa000) AM_READ_PORT("DSW1")
	AM_RANGE(0xa400, 0xa400) AM_READ_PORT("DSW2") AM_WRITE(amspdwy_flipscreen_w)	// DSW 2 + Toggle Flip Screen?
	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(0xb000, 0xb000) AM_WRITENOP										// ? Exiting IRQ
	AM_RANGE(0xb400, 0xb400) AM_DEVREAD("ym", amspdwy_sound_r) AM_WRITE(amspdwy_sound_w)		// YM2151 status, To Sound CPU
	AM_RANGE(0xc000, 0xc0ff) AM_RAM AM_BASE(&spriteram) AM_SIZE(&spriteram_size)// Sprites
	AM_RANGE(0xe000, 0xe7ff) AM_RAM												// Work RAM
ADDRESS_MAP_END


static READ8_HANDLER( amspdwy_port_r )
{
	UINT8 *Tracks = memory_region(space->machine, "maincpu")+0x10000;
	return Tracks[offset];
}

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



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


                                Sound CPU


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

static ADDRESS_MAP_START( amspdwy_sound_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM									// ROM
//  AM_RANGE(0x8000, 0x8000) AM_WRITENOP                            // ? Written with 0 at the start
	AM_RANGE(0x9000, 0x9000) AM_READ(soundlatch_r)					// From Main CPU
	AM_RANGE(0xa000, 0xa001) AM_DEVREADWRITE("ym", ym2151_r, ym2151_w)			//
	AM_RANGE(0xc000, 0xdfff) AM_RAM									// Work RAM
	AM_RANGE(0xffff, 0xffff) AM_READNOP								// ??? IY = FFFF at the start ?
ADDRESS_MAP_END




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


                                Input Ports


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

static INPUT_PORTS_START( amspdwy )
	PORT_START("DSW1")
	PORT_DIPNAME( 0x01, 0x00, "Character Test" )		PORT_DIPLOCATION("SW1:8")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x01, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x00, "Show Arrows" )			PORT_DIPLOCATION("SW1:7")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x02, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Demo_Sounds ) )	PORT_DIPLOCATION("SW1:6")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x04, DEF_STR( On ) )
	PORT_SERVICE_DIPLOC( 0x08, IP_ACTIVE_HIGH, "SW1:5" )
	PORT_DIPNAME( 0x10, 0x00, "Steering Test" )			PORT_DIPLOCATION("SW1:4")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x10, DEF_STR( On ) )
	PORT_DIPUNUSED_DIPLOC( 0x20, 0x00, "SW1:3" )		/* Listed as "Unused" */
	PORT_DIPUNUSED_DIPLOC( 0x40, 0x00, "SW1:2" )		/* Listed as "Unused" */
	PORT_DIPUNUSED_DIPLOC( 0x80, 0x00, "SW1:1" )		/* Listed as "Unused" */

	PORT_START("DSW2")
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Coinage ) )		PORT_DIPLOCATION("SW2:7,8")
	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_DIPLOCATION("SW2:5,6")
	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( 0x30, 0x00, "Time To Qualify" )		PORT_DIPLOCATION("SW2:3,4") /* code at 0x1770 */
	PORT_DIPSETTING(    0x30, "20 sec" )
	PORT_DIPSETTING(    0x20, "30 sec" )
	PORT_DIPSETTING(    0x10, "45 sec" )
	PORT_DIPSETTING(    0x00, "60 sec" )
	PORT_DIPUNUSED_DIPLOC( 0x40, 0x00, "SW2:2" )		/* Listed as "Unused" */
	PORT_DIPUNUSED_DIPLOC( 0x80, 0x00, "SW2:1" )		/* Listed as "Unused" */

	PORT_START("WHEEL1")	// 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("WHEEL2")	// 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("IN0")	// 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("AN1")	// 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("AN2")	// 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


static INPUT_PORTS_START( amspdwya )

	PORT_INCLUDE(amspdwy)

	PORT_MODIFY("DSW2")
	PORT_DIPNAME( 0x10, 0x00, "Time To Qualify" )		PORT_DIPLOCATION("SW2:4") /* code at 0x2696 */
	PORT_DIPSETTING(    0x10, "45 sec" )
	PORT_DIPSETTING(    0x00, "60 sec" )
	PORT_DIPUNUSED_DIPLOC( 0x20, 0x00, "SW2:3" )		/* Listed as "Unused" */
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 GFXDECODE_START( amspdwy )
	GFXDECODE_ENTRY( "gfx1", 0, layout_8x8x2,   0, 8 ) // [0] Layer & Sprites
GFXDECODE_END



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


                                Machine Drivers


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


static void irq_handler(const device_config *device, int irq)
{
	cputag_set_input_line(device->machine, "audiocpu", 0, irq ? ASSERT_LINE : CLEAR_LINE);
}

static const ym2151_interface amspdwy_ym2151_interface =
{
	irq_handler
};

static MACHINE_START( amspdwy )
{
    wheel_old[0]    = wheel_old[1]    = 0;
    wheel_return[0] = wheel_return[1] = 0;
    state_save_register_global_array(machine, wheel_old);
    state_save_register_global_array(machine, wheel_return);
}

static MACHINE_DRIVER_START( amspdwy )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", Z80,3000000)
	MDRV_CPU_PROGRAM_MAP(amspdwy_map)
	MDRV_CPU_IO_MAP(amspdwy_portmap)
	MDRV_CPU_VBLANK_INT("screen", irq0_line_hold)	/* IRQ: 60Hz, NMI: retn */

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

    MDRV_MACHINE_START(amspdwy)

	/* video hardware */
	MDRV_SCREEN_ADD("screen", RASTER)
	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	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)
	MDRV_PALETTE_LENGTH(32)

	MDRV_VIDEO_START(amspdwy)
	MDRV_VIDEO_UPDATE(amspdwy)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")

	MDRV_SOUND_ADD("ym", YM2151, 3000000)
	MDRV_SOUND_CONFIG(amspdwy_ym2151_interface)
	MDRV_SOUND_ROUTE(0, "lspeaker", 1.0)
	MDRV_SOUND_ROUTE(1, "rspeaker", 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, "maincpu", 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, "audiocpu", 0 )		/* Sound Z80 Code */
	ROM_LOAD( "audi9463.u2", 0x00000, 0x8000, CRC(61b0467e) SHA1(74509e7712838dd760919893aeda9241d308d0c3) )

	ROM_REGION( 0x4000, "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, "maincpu", 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, "audiocpu", 0 )		/* Sound Z80 Code */
	ROM_LOAD( "audi9463.u2", 0x00000, 0x8000, CRC(61b0467e) SHA1(74509e7712838dd760919893aeda9241d308d0c3) )

	ROM_REGION( 0x4000, "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)", GAME_SUPPORTS_SAVE )
GAME( 1987, amspdwya, amspdwy, amspdwy, amspdwya, 0, ROT0, "Enerdyne Technologies, Inc.", "American Speedway (set 2)", GAME_SUPPORTS_SAVE )
