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

    Ambush Memory Map (preliminary)

    driver by Zsolt Vasvari


    Memory Mapped:

    0000-7fff   R   ROM
    8000-87ff   R/W RAM
    a000        R   Watchdog Reset
    c080-c09f   W   Scroll RAM (1 byte for each column)
    c100-c1ff   W   Color RAM (1 line corresponds to 4 in the video ram)
    c200-c3ff   W   Sprite RAM
    c400-c7ff   W   Video RAM
    c800        R   DIP Switches
    cc00-cc03   W   ??? (Maybe analog sound triggers?)
    cc04        W   Flip Screen
    cc05        W   Color Bank Select
    cc07        W   Coin Counter


    I/O Ports:

    00-01       R/W AY8912 #0 (Port A = Input Port #0)
    80-81       R/W AY8912 #1 (Port A = Input Port #1)


    TODO:

    - Verify actual Z80 and AY8912 clock speeds from PCB (XTAL confirmed)

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "sound/ay8910.h"
#include "includes/ambush.h"


/*************************************
 *
 *  Memory handlers
 *
 *************************************/

static WRITE8_HANDLER( ambush_coin_counter_w )
{
	coin_counter_w(space->machine(), 0, data & 0x01);
	coin_counter_w(space->machine(), 1, data & 0x02);
}

static WRITE8_HANDLER( flip_screen_w )
{
	flip_screen_set(space->machine(), data);
}


/*************************************
 *
 *  Address maps
 *
 *************************************/

static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0x87ff) AM_RAM
	AM_RANGE(0xa000, 0xa000) AM_READ(watchdog_reset_r)
	AM_RANGE(0xc000, 0xc7ff) AM_RAM
	AM_RANGE(0xc080, 0xc09f) AM_BASE_MEMBER(ambush_state, m_scrollram)
	AM_RANGE(0xc100, 0xc1ff) AM_BASE_MEMBER(ambush_state, m_colorram)
	AM_RANGE(0xc200, 0xc3ff) AM_BASE_SIZE_MEMBER(ambush_state, m_spriteram, m_spriteram_size)
	AM_RANGE(0xc400, 0xc7ff) AM_BASE_SIZE_MEMBER(ambush_state, m_videoram, m_videoram_size)
	AM_RANGE(0xc800, 0xc800) AM_READ_PORT("DSW1")
	AM_RANGE(0xcc00, 0xcc03) AM_WRITENOP
	AM_RANGE(0xcc04, 0xcc04) AM_WRITE(flip_screen_w)
	AM_RANGE(0xcc05, 0xcc05) AM_WRITEONLY AM_BASE_MEMBER(ambush_state, m_colorbank)
	AM_RANGE(0xcc07, 0xcc07) AM_WRITE(ambush_coin_counter_w)
ADDRESS_MAP_END

static ADDRESS_MAP_START( main_portmap, AS_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_DEVREADWRITE("ay1", ay8910_r, ay8910_address_w)
	AM_RANGE(0x01, 0x01) AM_DEVWRITE("ay1", ay8910_data_w)
	AM_RANGE(0x80, 0x80) AM_DEVREADWRITE("ay2", ay8910_r, ay8910_address_w)
	AM_RANGE(0x81, 0x81) AM_DEVWRITE("ay2", ay8910_data_w)
ADDRESS_MAP_END


/*************************************
 *
 *  Input ports
 *
 *************************************/

static INPUT_PORTS_START( ambush )
	PORT_START("SYSTEM")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN1 )

	PORT_START("INPUTS")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )    PORT_8WAY
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )  PORT_8WAY
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )  PORT_8WAY
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )    PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )  PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )  PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL

	PORT_START("DSW1")
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Lives ) )            PORT_DIPLOCATION("SW1:1,2")
	PORT_DIPSETTING(    0x00, "3" )
	PORT_DIPSETTING(    0x01, "4" )
	PORT_DIPSETTING(    0x02, "5" )
	PORT_DIPSETTING(    0x03, "6" )
	PORT_DIPNAME( 0x1c, 0x00, DEF_STR( Coinage ) )          PORT_DIPLOCATION("SW1:3,4,5")
	PORT_DIPSETTING(    0x10, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x14, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0x04, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x18, DEF_STR( 2C_5C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x0c, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x1c, "Service Mode/Free Play" )
	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Difficulty ) )       PORT_DIPLOCATION("SW1:6")
	PORT_DIPSETTING(    0x00, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Hard ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Bonus_Life ) )       PORT_DIPLOCATION("SW1:7")
	PORT_DIPSETTING(    0x40, "80000" )
	PORT_DIPSETTING(    0x00, "120000" )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Cabinet ) )          PORT_DIPLOCATION("SW1:8")
	PORT_DIPSETTING(    0x80, DEF_STR( Upright ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Cocktail ) )
INPUT_PORTS_END

static INPUT_PORTS_START( ambusht )
	PORT_INCLUDE( ambush )

	PORT_MODIFY("DSW1")
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Allow_Continue ) )   PORT_DIPLOCATION("SW1:3")
	PORT_DIPSETTING(    0x00, DEF_STR( No ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x08, 0x00, "Service Mode/Free Play" )    PORT_DIPLOCATION("SW1:4")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x08, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Coinage ) )          PORT_DIPLOCATION("SW1:5")
	PORT_DIPSETTING(    0x00, "A 1/1 B 1/2" )
	PORT_DIPSETTING(    0x10, "A 2/1 B 1/3" )
INPUT_PORTS_END


/*************************************
 *
 *  Graphics definitions
 *
 *************************************/

static const gfx_layout charlayout =
{
	8,8,    /* 8*8 chars */
	1024,   /* 2048 characters */
	2,      /* 2 bits per pixel */
	{ 0, 0x2000*8 },  /* The bitplanes are separate */
	{ 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 spritelayout =
{
	16,16,  /* 8*8 chars */
	256,    /* 2048 characters */
	2,      /* 2 bits per pixel */
	{ 0, 0x2000*8 },  /* The bitplanes are separate */
	{     0,     1,     2,     3,     4,     5,     6,     7,
	  8*8+0, 8*8+1, 8*8+2, 8*8+3, 8*8+4, 8*8+5, 8*8+6, 8*8+7 },
	{  0*8,  1*8,  2*8,  3*8,  4*8,  5*8,  6*8,  7*8,
	  16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8 },
	32*8     /* every char takes 32 consecutive bytes */
};

static GFXDECODE_START( ambush )
	GFXDECODE_ENTRY( "gfx1", 0x0000, charlayout,   0, 64 )
	GFXDECODE_ENTRY( "gfx1", 0x0000, spritelayout, 0, 64 )
GFXDECODE_END


/*************************************
 *
 *  Sound interfaces
 *
 *************************************/

static const ay8910_interface ay8912_interface_1 =
{
	AY8910_LEGACY_OUTPUT,
	AY8910_DEFAULT_LOADS,
	DEVCB_INPUT_PORT("SYSTEM"),
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL
};

static const ay8910_interface ay8912_interface_2 =
{
	AY8910_LEGACY_OUTPUT,
	AY8910_DEFAULT_LOADS,
	DEVCB_INPUT_PORT("INPUTS"),
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL
};


/*************************************
 *
 *  Machine driver
 *
 *************************************/

static MACHINE_CONFIG_START( ambush, ambush_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL_18_432MHz/6)		/* XTAL confirmed, divisor guessed */
	MCFG_CPU_PROGRAM_MAP(main_map)
	MCFG_CPU_IO_MAP(main_portmap)
	MCFG_CPU_VBLANK_INT("screen", irq0_line_hold)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500) /* not accurate */)
	MCFG_SCREEN_SIZE(32*8, 32*8)
	MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-3)  /* The -3 makes the cocktail mode perfect */
	MCFG_SCREEN_UPDATE_STATIC(ambush)

	MCFG_GFXDECODE(ambush)
	MCFG_PALETTE_LENGTH(256)

	MCFG_PALETTE_INIT(ambush)

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

	MCFG_SOUND_ADD("ay1", AY8912, XTAL_18_432MHz/6/2)	/* XTAL confirmed, divisor guessed */
	MCFG_SOUND_CONFIG(ay8912_interface_1)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.33)

	MCFG_SOUND_ADD("ay2", AY8912, XTAL_18_432MHz/6/2)	/* XTAL confirmed, divisor guessed */
	MCFG_SOUND_CONFIG(ay8912_interface_2)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.33)
MACHINE_CONFIG_END


/*************************************
 *
 *  ROM definition(s)
 *
 *************************************/

/* displays an M next to ROM 1 during the test, why is internal checksum wrong (0x02 instead of 0x00) ? */
ROM_START( ambush )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "a1.i7",    0x0000, 0x2000, CRC(a7cd149d) SHA1(470ebe60bc23a7908fb96caef8074d65f8c57625) )
	ROM_LOAD( "a2.g7",    0x2000, 0x2000, CRC(8328d88a) SHA1(690f0af10a0550566b67ee570f849b2764448d15) )
	ROM_LOAD( "a3.f7",    0x4000, 0x2000, CRC(8db57ab5) SHA1(5cc7d7ebdfc91fb8d9ed52836d70c1de68001402) )
	ROM_LOAD( "a4.e7",    0x6000, 0x2000, CRC(4a34d2a4) SHA1(ad623161cd6031cb6503ff7445fdd9fb4ea83c8c) )

	ROM_REGION( 0x4000, "gfx1", 0 )
	ROM_LOAD( "fa2.n4",    0x0000, 0x2000, CRC(e7f134ba) SHA1(c38321f3da049f756337cba5b3c71f6935922f80) )
	ROM_LOAD( "fa1.m4",    0x2000, 0x2000, CRC(ad10969e) SHA1(4cfccdc4ca377693e92d77cde16f88bbdb840b38) )

	ROM_REGION( 0x0400, "proms", 0 )
	ROM_LOAD( "a.bpr",        0x0000, 0x0100, CRC(5f27f511) SHA1(fe3ae701443ff50d3d03c0a5d0e0ab0e716b05cc) )  /* color PROMs */

	ROM_LOAD( "b.bpr",        0x0100, 0x0100, CRC(1b03fd3b) SHA1(1a58b212476cacace6065056f23b59a69053a2f6) )	/* How is this selected, */
	ROM_LOAD( "13.bpr",		  0x0200, 0x0100, CRC(547e970f) SHA1(e2ec0bece49fb283e43549703d6d5d6f561c69a6) )  /* I'm not sure what these do. */
	ROM_LOAD( "14.bpr",		  0x0300, 0x0100, CRC(622a8ce7) SHA1(6834f67874251f2ef3a33aec893311f5d10e496f) )  /* They don't look like color PROMs */
ROM_END

ROM_START( ambushj )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "ambush.h7",    0x0000, 0x2000, CRC(ce306563) SHA1(c69b5c4465187a8eda6367d6cd3e0b71a57588d1) )
	ROM_LOAD( "ambush.g7",    0x2000, 0x2000, CRC(90291409) SHA1(82f1e109bd066ad9fdea1ce0086be6c334e2658a) )
	ROM_LOAD( "ambush.f7",    0x4000, 0x2000, CRC(d023ca29) SHA1(1ac44960cf6d79936517a9ad4bae6ccd825c9496) )
	ROM_LOAD( "ambush.e7",    0x6000, 0x2000, CRC(6cc2d3ee) SHA1(dccb417d156460ca745d7b62f1df733cbf85d092) )

	ROM_REGION( 0x4000, "gfx1", 0 )
	ROM_LOAD( "ambush.n4",    0x0000, 0x2000, CRC(ecc0dc85) SHA1(577304bb575293b97b50eea4faafb5394e3da0f5) )
	ROM_LOAD( "ambush.m4",    0x2000, 0x2000, CRC(e86ca98a) SHA1(fae0786bb78ead81653adddd2edb3058371ca5bc) )

	ROM_REGION( 0x0400, "proms", 0 )
	ROM_LOAD( "a.bpr",        0x0000, 0x0100, CRC(5f27f511) SHA1(fe3ae701443ff50d3d03c0a5d0e0ab0e716b05cc) )  /* color PROMs */

	ROM_LOAD( "b.bpr",        0x0100, 0x0100, CRC(1b03fd3b) SHA1(1a58b212476cacace6065056f23b59a69053a2f6) )	/* How is this selected, */
	ROM_LOAD( "13.bpr",		  0x0200, 0x0100, CRC(547e970f) SHA1(e2ec0bece49fb283e43549703d6d5d6f561c69a6) )  /* I'm not sure what these do. */
	ROM_LOAD( "14.bpr",		  0x0300, 0x0100, CRC(622a8ce7) SHA1(6834f67874251f2ef3a33aec893311f5d10e496f) )  /* They don't look like color PROMs */
ROM_END

ROM_START( ambushv )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "n1_h7.bin",    0x0000, 0x2000, CRC(3c0833b4) SHA1(dd0cfb6da281742114abfe652d38038b078b959e) )
	ROM_LOAD( "ambush.g7",    0x2000, 0x2000, CRC(90291409) SHA1(82f1e109bd066ad9fdea1ce0086be6c334e2658a) )
	ROM_LOAD( "ambush.f7",    0x4000, 0x2000, CRC(d023ca29) SHA1(1ac44960cf6d79936517a9ad4bae6ccd825c9496) )
	ROM_LOAD( "ambush.e7",    0x6000, 0x2000, CRC(6cc2d3ee) SHA1(dccb417d156460ca745d7b62f1df733cbf85d092) )

	ROM_REGION( 0x4000, "gfx1", 0 )
	ROM_LOAD( "ambush.n4",    0x0000, 0x2000, CRC(ecc0dc85) SHA1(577304bb575293b97b50eea4faafb5394e3da0f5) )
	ROM_LOAD( "ambush.m4",    0x2000, 0x2000, CRC(e86ca98a) SHA1(fae0786bb78ead81653adddd2edb3058371ca5bc) )

	ROM_REGION( 0x0400, "proms", 0 )
	ROM_LOAD( "a.bpr",        0x0000, 0x0100, CRC(5f27f511) SHA1(fe3ae701443ff50d3d03c0a5d0e0ab0e716b05cc) )  /* color PROMs */

	ROM_LOAD( "b.bpr",        0x0100, 0x0100, CRC(1b03fd3b) SHA1(1a58b212476cacace6065056f23b59a69053a2f6) )	/* How is this selected, */
	ROM_LOAD( "13.bpr",		  0x0200, 0x0100, CRC(547e970f) SHA1(e2ec0bece49fb283e43549703d6d5d6f561c69a6) )  /* I'm not sure what these do. */
	ROM_LOAD( "14.bpr",		  0x0300, 0x0100, CRC(622a8ce7) SHA1(6834f67874251f2ef3a33aec893311f5d10e496f) )  /* They don't look like color PROMs */
ROM_END

/*************************************
 *
 *  Game driver(s)
 *
 *************************************/

GAME( 1983, ambush,  0,      ambush,   ambusht,  0, ROT0, "Tecfri",                            "Ambush", GAME_SUPPORTS_SAVE )
GAME( 1983, ambushj, ambush, ambush,   ambush,   0, ROT0, "Tecfri (Nippon Amuse license)",     "Ambush (Japan)", GAME_SUPPORTS_SAVE )
GAME( 1983, ambushv, ambush, ambush,   ambush,   0, ROT0, "Tecfri (Volt Electronics license)", "Ambush (Volt Electronics)", GAME_SUPPORTS_SAVE )
