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

                                Air Buster
                            (C) 1990  Kaneko

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

CPU   : Z-80 x 3
SOUND : YM2203C     M6295
OSC.  : 12.000MHz   16.000MHz

                    Interesting routines (main cpu)
                    -------------------------------

fd-fe   address of int: 0x38    (must alternate? see e600/1)
ff-100  address of int: 0x16
66      print "sub cpu caused nmi" and die!

7       after tests

1497    print string following call: (char)*,0. program continues after 0.
        base addr = c300 + HL & 08ff, DE=xy , BC=dxdy
        +0<-(e61b)  +100<-D +200<-E +300<-char  +400<-(e61c)

1642    A<- buttons status (bits 0&1)

                    Interesting locations (main cpu)
                    --------------------------------

2907    table of routines (f150 index = 1-3f, copied to e612)
        e60e<-address of routine, f150<-0. e60e is used until f150!=0

    1:  2bf4    service mode                                next

    2:  2d33    3:  16bd        4:  2dcb        5:  2fcf
    6:  3262    7:  32b8

    8:  335d>   print gfx/color test page                   next
    9:  33c0>   handle the above page

    a:  29c6        b:  2a24        c:  16ce

    d:  3e7e>   *
    e:  3ec5>   print "Sub Cpu / Ram Error"; **
    f:  3e17>   print "Coin error"; **
    10: 3528>   print (c) notice, not shown                 next
    11: 3730>   show (c) notice, wait 0x100 calls           next

    12:     9658    13: 97c3        14: a9fa        15: aa6e
    16-19:  2985    1a: 9c2e        1b: 9ffa        1c: 29c6

    1d: 2988>   *

    1e: a2c4        1f: a31a        20: a32f        21: a344
    22: a359        23: a36e        24: a383        25: a398
    26: a3ad        27: a3c2        28: a3d7        29: a3f1
    2a: a40e        2b: a4e5        2c: a69d        2d: adb8
    2e: ade9        2f: 2b8b        30: a823

    31: 3d17>   print "warm up, wait few mins. secs left: 00"   next
    32: 3dc0>   pause (e624 counter).e626                       next

    33: 96b4        34: 97ad

    35-3f:  3e7e>   *

*   Print "Command Error [$xx]" where xx is last routine index (e612)
**  ld (0000h),A (??) ; loop

3cd7    hiscores table (0x40 bytes, copied to e160)
        Try entering TERU as your name :)

7fff    country code: 0 <-> Japan; else World

e615    rank:   0-easy  1-normal    2-hard  3-hardest
e624    sound code during sound test

-- Shared RAM --

f148<-  sound code (copied from e624)
f14a->  read on nmi routine. main cpu writes the value and writes to port 02
f150<-  index of table of routines at 2907

----------------





                    Interesting routines (sub cpu)
                    -------------------------------

491     copy palette data   d000<-f200(a0)  d200<-f300(a0)  d400<-f400(200)

61c     f150<-A     f151<-A (routine index of main cpu!)
        if dsw1-2 active, it does nothing (?!)

c8c     c000-c7ff<-0    c800-cfff<-0    f600<-f200(400)
1750    copies 10 lines of 20 bytes from 289e to f800

22cd    copy 0x100 bytes
22cf    copy 0x0FF bytes
238d    copy 0x0A0 bytes

                    Interesting locations (sub cpu)
                    --------------------------------

fd-fe   address of int: 0x36e   (same as 38)
ff-100  address of int: 0x4b0

-- Shared RAM --

f000    credits

f001/d<-IN 24 (Service)
f00e<-  bank
f002<-  dsw1 (cpl'd)
f003<-  dsw2 (cpl'd)
f004<-  IN 20 (cpl'd) (player 1)
f005<-  IN 22 (cpl'd) (player 2)
f006<-  start lives: dsw-2 & 0x30 index; values: 3,4,5,7        (5da table)
f007    current lives p1
f008    current lives p2

f009<-  coin/credit 1: dsw-1 & 0x30 index; values: 11,12,21,23  (5de table)
f00a<-  coin 1
f00b<-  coin/credit 2: dsw-1 & 0xc0 index; values: 11,12,21,23  (5e2 table)
f00c<-  coin 2

f00f    ?? outa (28h)
f010    written by sub cpu, bit 4 read by main cpu.
        bit 0   p1 playing
        bit 1   p2 playing

f014    index (1-f) of routine called during int 36e (table at c3f)
    1:  62b         2:  66a         3:  6ad         4:  79f
    5:  7e0         6:  81b         7:  8a7         8:  8e9
    9:  b02         a:  0           b:  0           c:  bfc
    d:  c0d         e:  a6f         f:  ac3

f015    index of the routine to call, usually the one selected by f014
        but sometimes written directly.

Scroll registers: ports 04/06/08/0a/0c, written in sequence (101f)
port 06 <- f100 + f140  x       port 04 <- f104 + f142  y
port 0a <- f120 + f140  x       port 08 <- f124 + f142  y
port 0c <- f14c = bit 0/1/2/3 = port 6/4/a/8 val < FF

f148->  sound code (from main cpu)
f14c    scroll regs high bits

----------------








                    Interesting routines (sound cpu)
                    -------------------------------

50a     6295
521     6295
a96     2203 reg<-B     val<-A

                    Interesting locations (sound cpu)
                    ---------------------------------

c715
c716    pending sound command
c760    rom bank


                                To Do
                                -----

- Is the sub cpu / sound cpu communication status port (0e) correct ?
- Main cpu: port  01 ?
- Sub  cpu: port 0x38 ? Plus it can probably cause a nmi to main cpu
- incomplete DSW's
- Spriteram low 0x300 bytes (priority?)

*/

/*
**
**              Main cpu data
**
*/

/*  Runs in IM 2    fd-fe   address of int: 0x38
                    ff-100  address of int: 0x16    */

/*
**
**              Sub cpu data
**
**
*/

/*  Runs in IM 2    fd-fe   address of int: 0x36e   (same as 0x38)
                    ff-100  address of int: 0x4b0   (only writes to port 38h)   */
/*
   Sub cpu and Sound cpu communicate bidirectionally:

       Sub   cpu writes to soundlatch,  reads from soundlatch2
       Sound cpu writes to soundlatch2, reads from soundlatch

   Each latch raises a flag when it's been written.
   The flag is cleared when the latch is read.

Code at 505: waits for bit 1 to go low, writes command, waits for bit
0 to go low, reads back value. Code at 3b2 waits bit 2 to go high
(called during int fd)

*/

#include "driver.h"
#include "deprecat.h"
#include "cpu/z80/z80.h"
#include "sound/2203intf.h"
#include "sound/okim6295.h"
#include "video/kan_pand.h"

static UINT8 *devram;
static int soundlatch_status, soundlatch2_status;
static int master_addr;
static int slave_addr;

extern UINT8 *airbustr_videoram2, *airbustr_colorram2;

extern WRITE8_HANDLER( airbustr_videoram_w );
extern WRITE8_HANDLER( airbustr_colorram_w );
extern WRITE8_HANDLER( airbustr_videoram2_w );
extern WRITE8_HANDLER( airbustr_colorram2_w );
extern WRITE8_HANDLER( airbustr_scrollregs_w );
extern VIDEO_START( airbustr );
extern VIDEO_UPDATE( airbustr );
extern VIDEO_EOF( airbustr );

/* Read/Write Handlers */

static READ8_HANDLER( devram_r )
{
	// There's an MCU here, possibly

	switch (offset)
	{
		/* Reading efe0 probably resets a watchdog mechanism
           that would reset the main cpu. We avoid this and patch
           the rom instead (main cpu has to be reset once at startup) */
		case 0xfe0:
			return watchdog_reset_r(space,0);

		/* Reading a word at eff2 probably yelds the product
           of the words written to eff0 and eff2 */
		case 0xff2:
		case 0xff3:
		{
			int	x = (devram[0xff0] + devram[0xff1] * 256) *
					(devram[0xff2] + devram[0xff3] * 256);
			if (offset == 0xff2)	return (x & 0x00FF) >> 0;
			else				return (x & 0xFF00) >> 8;
		}	break;

		/* Reading eff4, F0 times must yield at most 80-1 consecutive
           equal values */
		case 0xff4:
			return mame_rand(space->machine);

		default:
			return devram[offset];
	}
}

static WRITE8_HANDLER( master_nmi_trigger_w )
{
	cputag_set_input_line(space->machine, "slave", INPUT_LINE_NMI, PULSE_LINE);
}

static void airbustr_bankswitch(running_machine *machine, const char *cpu, int bank, int data)
{
	UINT8 *ROM = memory_region(machine, cpu);

	if ((data & 0x07) <  3)
		ROM = &ROM[0x4000 * (data & 0x07)];
	else
		ROM = &ROM[0x10000 + 0x4000 * ((data & 0x07) - 3)];

	memory_set_bankptr(machine, bank, ROM);
}

static WRITE8_HANDLER( master_bankswitch_w )
{
	airbustr_bankswitch(space->machine, "master", 1, data);
}

static WRITE8_HANDLER( slave_bankswitch_w )
{
	airbustr_bankswitch(space->machine, "slave", 2, data);

	flip_screen_set(space->machine, data & 0x10);

	// used at the end of levels, after defeating the boss, to leave trails
	pandora_set_clear_bitmap(data&0x20);
}

static WRITE8_HANDLER( sound_bankswitch_w )
{
	airbustr_bankswitch(space->machine, "audiocpu", 3, data);
}

static READ8_HANDLER( soundcommand_status_r )
{
	// bits: 2 <-> ?    1 <-> soundlatch full   0 <-> soundlatch2 empty
	return 4 + soundlatch_status * 2 + (1 - soundlatch2_status);
}

static READ8_HANDLER( soundcommand_r )
{
	soundlatch_status = 0;	// soundlatch has been read
	return soundlatch_r(space,0);
}

static READ8_HANDLER( soundcommand2_r )
{
	soundlatch2_status = 0;	// soundlatch2 has been read
	return soundlatch2_r(space,0);
}

static WRITE8_HANDLER( soundcommand_w )
{
	soundlatch_w(space, 0, data);
	soundlatch_status = 1;	// soundlatch has been written
	cputag_set_input_line(space->machine, "audiocpu", INPUT_LINE_NMI, PULSE_LINE);	// cause a nmi to sub cpu
}

static WRITE8_HANDLER( soundcommand2_w )
{
	soundlatch2_w(space, 0, data);
	soundlatch2_status = 1;	// soundlatch2 has been written
}

static WRITE8_HANDLER( airbustr_paletteram_w )
{
	int val;

	/*  ! byte 1 ! ! byte 0 !   */
	/*  xGGG GGRR   RRRB BBBB   */
	/*  x432 1043   2104 3210   */

	paletteram[offset] = data;
	val = (paletteram[offset | 1] << 8) | paletteram[offset & ~1];

	palette_set_color_rgb(space->machine, offset/2, pal5bit(val >> 5), pal5bit(val >> 10), pal5bit(val >> 0));
}

static WRITE8_HANDLER( airbustr_coin_counter_w )
{
	coin_counter_w(0, data & 1);
	coin_counter_w(1, data & 2);
	coin_lockout_w(0, ~data & 4);
	coin_lockout_w(1, ~data & 8);
}

/* Memory Maps */

static ADDRESS_MAP_START( master_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK(1)
	AM_RANGE(0xc000, 0xcfff) AM_READWRITE(pandora_spriteram_r, pandora_spriteram_w)
	AM_RANGE(0xd000, 0xdfff) AM_RAM
	AM_RANGE(0xe000, 0xefff) AM_RAM AM_BASE(&devram) // shared with protection device
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE(1)
ADDRESS_MAP_END

static ADDRESS_MAP_START( master_io_map, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_WRITE(master_bankswitch_w)
	AM_RANGE(0x01, 0x01) AM_WRITENOP // ???
	AM_RANGE(0x02, 0x02) AM_WRITE(master_nmi_trigger_w)
ADDRESS_MAP_END

static ADDRESS_MAP_START( slave_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK(2)
	AM_RANGE(0xc000, 0xc3ff) AM_RAM_WRITE(airbustr_videoram2_w) AM_BASE(&airbustr_videoram2)
	AM_RANGE(0xc400, 0xc7ff) AM_RAM_WRITE(airbustr_colorram2_w) AM_BASE(&airbustr_colorram2)
	AM_RANGE(0xc800, 0xcbff) AM_RAM_WRITE(airbustr_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0xcc00, 0xcfff) AM_RAM_WRITE(airbustr_colorram_w) AM_BASE(&colorram)
	AM_RANGE(0xd000, 0xd5ff) AM_RAM_WRITE(airbustr_paletteram_w) AM_BASE(&paletteram)
	AM_RANGE(0xd600, 0xdfff) AM_RAM
	AM_RANGE(0xe000, 0xefff) AM_RAM
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE(1)
ADDRESS_MAP_END

static ADDRESS_MAP_START( slave_io_map, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_WRITE(slave_bankswitch_w)
	AM_RANGE(0x02, 0x02) AM_READWRITE(soundcommand2_r, soundcommand_w)
	AM_RANGE(0x04, 0x0c) AM_WRITE(airbustr_scrollregs_w)
	AM_RANGE(0x0e, 0x0e) AM_READ(soundcommand_status_r)
	AM_RANGE(0x20, 0x20) AM_READ_PORT("P1")
	AM_RANGE(0x22, 0x22) AM_READ_PORT("P2")
	AM_RANGE(0x24, 0x24) AM_READ_PORT("SYSTEM")
	AM_RANGE(0x28, 0x28) AM_WRITE(airbustr_coin_counter_w)
	AM_RANGE(0x38, 0x38) AM_WRITENOP // ???
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK(3)
	AM_RANGE(0xc000, 0xdfff) AM_RAM
ADDRESS_MAP_END

static ADDRESS_MAP_START( sound_io_map, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_WRITE(sound_bankswitch_w)
	AM_RANGE(0x02, 0x03) AM_DEVREADWRITE("ym", ym2203_r, ym2203_w)
	AM_RANGE(0x04, 0x04) AM_DEVREADWRITE("oki", okim6295_r, okim6295_w)
	AM_RANGE(0x06, 0x06) AM_READWRITE(soundcommand_r, soundcommand2_w)
ADDRESS_MAP_END

/* Input Ports */

static INPUT_PORTS_START( airbustr )
	PORT_START("P1")
	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_BUTTON1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("P2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("SYSTEM")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )		// used

	PORT_START("DSW1")
	PORT_DIPUNUSED_DIPLOC( 0x01, IP_ACTIVE_LOW, "SW1:1" )
	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Flip_Screen ) )	PORT_DIPLOCATION("SW1:2")
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_SERVICE_DIPLOC( 0x04, IP_ACTIVE_LOW, "SW1:3" )
	PORT_DIPNAME( 0x08, 0x08, "Coin Mode" )				PORT_DIPLOCATION("SW1:4")
	PORT_DIPSETTING(    0x08, "Mode 1" )			//     routine at 0x056d: 11 21 12 16 (bit 3 active)
	PORT_DIPSETTING(    0x00, "Mode 2" )			//     11 21 13 14 (bit 3 not active)
	PORT_DIPNAME( 0x30, 0x30, DEF_STR( Coin_A ) )		PORT_DIPLOCATION("SW1:5,6")
	PORT_DIPSETTING(    0x20, DEF_STR( 2C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_2C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_6C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x20, DEF_STR( 2C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_3C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_4C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Coin_B ) )		PORT_DIPLOCATION("SW1:7,8")
	PORT_DIPSETTING(    0x80, DEF_STR( 2C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0xc0, DEF_STR( 1C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x40, DEF_STR( 1C_2C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_6C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_NOTEQUALS, 0x00)
	PORT_DIPSETTING(    0x80, DEF_STR( 2C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0xc0, DEF_STR( 1C_1C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0x40, DEF_STR( 1C_3C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_4C ) )	PORT_CONDITION("DSW1", 0x08, PORTCOND_EQUALS, 0x00)

	PORT_START("DSW2")
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) )	PORT_DIPLOCATION("SW2:1,2")
	PORT_DIPSETTING(    0x02, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x03, DEF_STR( Normal ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Difficult ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Very_Difficult ) )
	PORT_DIPUNUSED_DIPLOC( 0x04, IP_ACTIVE_LOW, "SW2:3" )
	PORT_DIPNAME( 0x08, 0x08, "Freeze" )				PORT_DIPLOCATION("SW2:4")
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x30, 0x30, DEF_STR( Lives ) )		PORT_DIPLOCATION("SW2:5,6")
	PORT_DIPSETTING(    0x30, "3" )
	PORT_DIPSETTING(    0x20, "4" )
	PORT_DIPSETTING(    0x10, "5" )
	PORT_DIPSETTING(    0x00, "7" )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Demo_Sounds ) )	PORT_DIPLOCATION("SW2:7")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
	PORT_DIPUNUSED_DIPLOC( 0x80, IP_ACTIVE_LOW, "SW2:8" )
INPUT_PORTS_END

static INPUT_PORTS_START( airbustj )
	PORT_INCLUDE(airbustr)

	PORT_MODIFY("DSW1")
	PORT_DIPUNUSED_DIPLOC( 0x08, IP_ACTIVE_LOW, "SW1:4" )
	PORT_DIPNAME( 0x30, 0x30, DEF_STR( Coin_A ) )		PORT_DIPLOCATION("SW1:5,6")	// routine at 0x0546 : 11 12 21 23
	PORT_DIPSETTING(    0x10, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_2C ) )
	PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Coin_B ) )		PORT_DIPLOCATION("SW1:7,8")
	PORT_DIPSETTING(    0x40, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0xc0, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0x80, DEF_STR( 1C_2C ) )
INPUT_PORTS_END

/* Graphics Layout */

static const gfx_layout tile_gfxlayout =
{
	16, 16,
	RGN_FRAC(1,1),
	4,
	{ 0, 1, 2, 3 },
	{  1*4, 0*4, 3*4, 2*4, 5*4, 4*4, 7*4, 6*4,
	   1*4+32*8, 0*4+32*8, 3*4+32*8, 2*4+32*8, 5*4+32*8, 4*4+32*8, 7*4+32*8, 6*4+32*8 },
	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
	  0*32+64*8, 1*32+64*8, 2*32+64*8, 3*32+64*8, 4*32+64*8, 5*32+64*8, 6*32+64*8, 7*32+64*8 },
	16*16*4
};

static const gfx_layout sprite_gfxlayout =
{
	16, 16,
	RGN_FRAC(1,1),
	4,
	{ 0, 1, 2, 3 },
	{ 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4,
	  0*4+32*8, 1*4+32*8, 2*4+32*8, 3*4+32*8, 4*4+32*8, 5*4+32*8, 6*4+32*8, 7*4+32*8 },
	{ 0*32, 1*32, 2*32, 3*32, 4*32, 5*32, 6*32, 7*32,
	  0*32+64*8, 1*32+64*8, 2*32+64*8, 3*32+64*8, 4*32+64*8, 5*32+64*8, 6*32+64*8, 7*32+64*8 },
	16*16*4
};

/* Graphics Decode Information */

static GFXDECODE_START( airbustr )
	GFXDECODE_ENTRY( "gfx1", 0, tile_gfxlayout,   0, 32 ) // tiles
	GFXDECODE_ENTRY( "gfx2", 0, sprite_gfxlayout, 512, 16 ) // sprites
GFXDECODE_END

/* Sound Interfaces */

static const ym2203_interface ym2203_config =
{
	{
		AY8910_LEGACY_OUTPUT,
		AY8910_DEFAULT_LOADS,
		DEVCB_INPUT_PORT("DSW1"),		// DSW-1 connected to port A
		DEVCB_INPUT_PORT("DSW2"),		// DSW-2 connected to port B
		DEVCB_NULL,
		DEVCB_NULL
	},
	NULL
};

/* Interrupt Generators */

static INTERRUPT_GEN( master_interrupt )
{
	master_addr ^= 0x02;
	cpu_set_input_line_and_vector(device, 0, HOLD_LINE, master_addr);
}

static INTERRUPT_GEN( slave_interrupt )
{
	slave_addr ^= 0x02;
	cpu_set_input_line_and_vector(device, 0, HOLD_LINE, slave_addr);
}

/* Machine Initialization */

static MACHINE_START( airbustr )
{
    state_save_register_global(machine, soundlatch_status);
    state_save_register_global(machine, soundlatch2_status);
    state_save_register_global(machine, master_addr);
    state_save_register_global(machine, slave_addr);
}

static MACHINE_RESET( airbustr )
{
	const address_space *space = cputag_get_address_space(machine, "master", ADDRESS_SPACE_PROGRAM);
	soundlatch_status = soundlatch2_status = 0;
	master_addr = 0xff;
	slave_addr = 0xfd;
	master_bankswitch_w(space, 0, 0x02);
	slave_bankswitch_w(space, 0, 0x02);
	sound_bankswitch_w(space, 0, 0x02);
}

/* Machine Driver */

static MACHINE_DRIVER_START( airbustr )
	// basic machine hardware
	MDRV_CPU_ADD("master", Z80, 6000000)	// ???
	MDRV_CPU_PROGRAM_MAP(master_map)
	MDRV_CPU_IO_MAP(master_io_map)
	MDRV_CPU_VBLANK_INT_HACK(master_interrupt, 2)	// nmi caused by sub cpu?, ?

	MDRV_CPU_ADD("slave", Z80, 6000000)	// ???
	MDRV_CPU_PROGRAM_MAP(slave_map)
	MDRV_CPU_IO_MAP(slave_io_map)
	MDRV_CPU_VBLANK_INT_HACK(slave_interrupt, 2)		// nmi caused by main cpu, ?

	MDRV_CPU_ADD("audiocpu", Z80, 6000000)	// ???
	MDRV_CPU_PROGRAM_MAP(sound_map)
	MDRV_CPU_IO_MAP(sound_io_map)
	MDRV_CPU_VBLANK_INT("screen", irq0_line_hold)		// nmi are caused by sub cpu writing a sound command

	MDRV_QUANTUM_TIME(HZ(6000))	// Palette RAM is filled by sub cpu with data supplied by main cpu
							// Maybe a high value is safer in order to avoid glitches
    MDRV_MACHINE_START(airbustr)
	MDRV_MACHINE_RESET(airbustr)
	MDRV_WATCHDOG_TIME_INIT(SEC(3))	/* a guess, and certainly wrong */

	// 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(32*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0, 32*8-1, 2*8, 30*8-1)
	MDRV_GFXDECODE(airbustr)
	MDRV_PALETTE_LENGTH(768)

	MDRV_VIDEO_START(airbustr)
	MDRV_VIDEO_UPDATE(airbustr)
	MDRV_VIDEO_EOF(airbustr)

	// sound hardware
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD("ym", YM2203, 3000000)
	MDRV_SOUND_CONFIG(ym2203_config)
	MDRV_SOUND_ROUTE(0, "mono", 0.25)
	MDRV_SOUND_ROUTE(1, "mono", 0.25)
	MDRV_SOUND_ROUTE(2, "mono", 0.25)
	MDRV_SOUND_ROUTE(3, "mono", 0.50)

	MDRV_SOUND_ADD("oki", OKIM6295, 12000000/4)
	MDRV_SOUND_CONFIG(okim6295_interface_pin7low)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)
MACHINE_DRIVER_END

static MACHINE_DRIVER_START( airbusb )
	MDRV_IMPORT_FROM(airbustr)
	MDRV_WATCHDOG_TIME_INIT(SEC(0)) // no protection device or watchdog
MACHINE_DRIVER_END


/* ROMs */

ROM_START( airbustr )
	ROM_REGION( 0x24000, "master", 0 )
	ROM_LOAD( "pr12.h19",   0x00000, 0x0c000, CRC(91362eb2) SHA1(cd85acfa6542af68dd1cad46f9426a95cfc9432e) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "slave", 0 )
	ROM_LOAD( "pr13.l15",   0x00000, 0x0c000, CRC(13b2257b) SHA1(325efa54e757a1f08caf81801930d61ea4e7b6d4) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "audiocpu", 0 )
	ROM_LOAD( "pr-21.bin",  0x00000, 0x0c000, CRC(6e0a5df0) SHA1(616b7c7aaf52a9a55b63c60717c1866940635cd4) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x1000, "mcu", 0 ) //MCU is a 80c51 like DJ Boy / Heavy Unit?
	ROM_LOAD( "i80c51", 0x0000, 0x1000, NO_DUMP )

	ROM_REGION( 0x80000, "gfx1", ROMREGION_DISPOSE )
	ROM_LOAD( "pr-000.bin", 0x00000, 0x80000, CRC(8ca68f0d) SHA1(d60389e7e63e9850bcddecb486558de1414f1276) ) // scrolling layers

	ROM_REGION( 0x100000, "gfx2", ROMREGION_DISPOSE )
	ROM_LOAD( "pr-001.bin", 0x00000, 0x80000, CRC(7e6cb377) SHA1(005290f9f53a0c3a6a9d04486b16b7fd52cc94b6) ) // sprites
	ROM_LOAD( "pr-02.bin",  0x80000, 0x10000, CRC(6bbd5e46) SHA1(26563737f3f91ee0a056d35ce42217bb57d8a081) )

	ROM_REGION( 0x40000, "oki", 0 )	/* OKI-M6295 samples */
	ROM_LOAD( "pr-200.bin", 0x00000, 0x40000, CRC(a4dd3390) SHA1(2d72b46b4979857f6b66489bebda9f48799f59cf) )
ROM_END

ROM_START( airbustj )
	ROM_REGION( 0x24000, "master", 0 )
	ROM_LOAD( "pr-14j.bin", 0x00000, 0x0c000, CRC(6b9805bd) SHA1(db6df33cf17316a4b81d7731dca9fe8bbf81f014) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "slave", 0 )
	ROM_LOAD( "pr-11j.bin", 0x00000, 0x0c000, CRC(85464124) SHA1(8cce8dfdede48032c40d5f155fd58061866668de) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "audiocpu", 0 )
	ROM_LOAD( "pr-21.bin",  0x00000, 0x0c000, CRC(6e0a5df0) SHA1(616b7c7aaf52a9a55b63c60717c1866940635cd4) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x1000, "mcu", 0 ) //MCU is a 80c51 like DJ Boy / Heavy Unit?
	ROM_LOAD( "i80c51", 0x0000, 0x1000, NO_DUMP )

	ROM_REGION( 0x80000, "gfx1", ROMREGION_DISPOSE )
	ROM_LOAD( "pr-000.bin", 0x00000, 0x80000, CRC(8ca68f0d) SHA1(d60389e7e63e9850bcddecb486558de1414f1276) ) // scrolling layers

	ROM_REGION( 0x100000, "gfx2", ROMREGION_DISPOSE )
	ROM_LOAD( "pr-001.bin", 0x000000, 0x80000, CRC(7e6cb377) SHA1(005290f9f53a0c3a6a9d04486b16b7fd52cc94b6) ) // sprites
	ROM_LOAD( "pr-02.bin",  0x080000, 0x10000, CRC(6bbd5e46) SHA1(26563737f3f91ee0a056d35ce42217bb57d8a081) )

	ROM_REGION( 0x40000, "oki", 0 )	/* OKI-M6295 samples */
	ROM_LOAD( "pr-200.bin", 0x00000, 0x40000, CRC(a4dd3390) SHA1(2d72b46b4979857f6b66489bebda9f48799f59cf) )
ROM_END

/*

Differences with the original (when running on the bootleg hardware):

no title screen
long attract modes of every level
slow downs with corrupted screen (you can see the screen being redrawn!) when there are many sprites

the board has 2 oscillators (12 and 16 mhz).  Rom 1 and 2 are program roms. 3 and 4 for sound.
Rom 5 is on a piggyback daughterboard with a z80 and a PAL

*/

ROM_START( airbusb )
	ROM_REGION( 0x24000, "master", 0 )
	ROM_LOAD( "5.bin",   0x00000, 0x0c000, CRC(9e4216a2) SHA1(46572da4df5a67b10cc3ee21bdc0ec4bcecaaf93) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "slave", 0 )
	ROM_LOAD( "1.bin",   0x00000, 0x0c000, CRC(85464124) SHA1(8cce8dfdede48032c40d5f155fd58061866668de) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x24000, "audiocpu", 0 )
	ROM_LOAD( "2.bin",  0x00000, 0x0c000, CRC(6e0a5df0) SHA1(616b7c7aaf52a9a55b63c60717c1866940635cd4) )
	ROM_CONTINUE(           0x10000, 0x14000 )

	ROM_REGION( 0x80000, "gfx1", ROMREGION_DISPOSE )
	/* Same content as airbusj, pr-001.bin, different sized roms / interleave */
	ROM_LOAD16_BYTE( "7.bin", 0x00000, 0x20000, CRC(2e3bf0a2) SHA1(84cabc753e5fd1164f0a8a9a9dee7d339a5607c5) )
	ROM_LOAD16_BYTE( "9.bin", 0x00001, 0x20000, CRC(2c23c646) SHA1(41c0f8788c9715918b4138f076415f8640adc483) )
	ROM_LOAD16_BYTE( "6.bin", 0x40000, 0x20000, CRC(0d6cd470) SHA1(329286bc6c9d1eccc74735d1c155a0f5f98f1444) )
	ROM_LOAD16_BYTE( "8.bin", 0x40001, 0x20000, CRC(b3372e51) SHA1(aa8dcbb84c829994ae04ceecbef795ac53e72493) )

	ROM_REGION( 0x100000, "gfx2", ROMREGION_DISPOSE )
	/* Same content as airbusj, pr-001.bin, different sized roms */
	ROM_LOAD( "13.bin", 0x00000, 0x20000, CRC(75dee86d) SHA1(fe342fed5bb84ee6f35d3f91987141c559e94d5a) )
	ROM_LOAD( "12.bin", 0x20000, 0x20000, CRC(c98a8333) SHA1(3a990460e232ee07a9297fcffdb02451406f5bf1) )
	ROM_LOAD( "11.bin", 0x40000, 0x20000, CRC(4e9baebd) SHA1(6cf878a3fb3d344e3f5f4d031fbde6f14b653636) )
	ROM_LOAD( "10.bin", 0x60000, 0x20000, CRC(63dc8cd8) SHA1(4b466a8ede4211fa3f51572b223eba8766990d7a) )

	ROM_LOAD( "14.bin", 0x80000, 0x10000, CRC(6bbd5e46) SHA1(26563737f3f91ee0a056d35ce42217bb57d8a081) )

	ROM_REGION( 0x40000, "oki", 0 )	/* OKI-M6295 samples */
	/* Same content as airbusj, pr-200.bin, different sized roms */
	ROM_LOAD( "4.bin", 0x00000, 0x20000, CRC(21d9bfe3) SHA1(4a69458cd2a6309e389c9e7593ae29d3ef0f8daf) )
	ROM_LOAD( "3.bin", 0x20000, 0x20000, CRC(58cd19e2) SHA1(479f22241bf29f7af67d9679fc6c20f10004fdd8) )
ROM_END

/* Driver Initialization */

static DRIVER_INIT( airbustr )
{
	memory_install_read8_handler(cputag_get_address_space(machine, "master", ADDRESS_SPACE_PROGRAM), 0xe000, 0xefff, 0, 0, devram_r); // protection device lives here
}


/* Game Drivers */

GAME( 1990, airbustr, 0,        airbustr, airbustr, airbustr, ROT0, "Kaneko (Namco license)", "Air Buster: Trouble Specialty Raid Unit (World)", GAME_SUPPORTS_SAVE )	// 891220
GAME( 1990, airbustj, airbustr, airbustr, airbustj, airbustr, ROT0, "Kaneko (Namco license)", "Air Buster: Trouble Specialty Raid Unit (Japan)", GAME_SUPPORTS_SAVE)    // 891229
GAME( 1990, airbusb,  airbustr, airbusb,  airbustj, 0,        ROT0, "bootleg", "Air Buster: Trouble Specialty Raid Unit (bootleg)", GAME_SUPPORTS_SAVE)	// based on Japan set (891229)
