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

Aliens (c) 1990 Konami Co. Ltd

Preliminary driver by:
	Manuel Abadia <manu@teleline.es>

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

#include "driver.h"
#include "vidhrdw/generic.h"
#include "cpu/konami/konami.h" /* for the callback and the firq irq definition */
#include "vidhrdw/konamiic.h"

/* prototypes */
static MACHINE_INIT( aliens );
static void aliens_banking( int lines );


VIDEO_START( aliens );
VIDEO_UPDATE( aliens );


static int palette_selected;
static unsigned char *ram;


static INTERRUPT_GEN( aliens_interrupt )
{
	if (K051960_is_IRQ_enabled())
		cpu_set_irq_line(0, KONAMI_IRQ_LINE, HOLD_LINE);
}

static READ_HANDLER( bankedram_r )
{
	if (palette_selected)
		return paletteram_r(offset);
	else
		return ram[offset];
}

static WRITE_HANDLER( bankedram_w )
{
	if (palette_selected)
		paletteram_xBBBBBGGGGGRRRRR_swap_w(offset,data);
	else
		ram[offset] = data;
}

static WRITE_HANDLER( aliens_coin_counter_w )
{
	/* bits 0-1 = coin counters */
	coin_counter_w(0,data & 0x01);
	coin_counter_w(1,data & 0x02);

	/* bit 5 = select work RAM or palette */
	palette_selected = data & 0x20;

	/* bit 6 = enable char ROM reading through the video RAM */
	K052109_set_RMRD_line((data & 0x40) ? ASSERT_LINE : CLEAR_LINE);

	/* other bits unknown */
#if 0
{
	char baf[40];
	sprintf(baf,"%02x",data);
	usrintf_showmessage(baf);
}
#endif
}

WRITE_HANDLER( aliens_sh_irqtrigger_w )
{
	soundlatch_w(offset,data);
	cpu_set_irq_line_and_vector(1, 0, HOLD_LINE, 0xff);
}

static WRITE_HANDLER( aliens_snd_bankswitch_w )
{
	/* b1: bank for chanel A */
	/* b0: bank for chanel B */

	int bank_A = ((data >> 1) & 0x01);
	int bank_B = ((data) & 0x01);

	K007232_set_bank( 0, bank_A, bank_B );
}


static MEMORY_READ_START( aliens_readmem )
	{ 0x0000, 0x03ff, bankedram_r },			/* palette + work RAM */
	{ 0x0400, 0x1fff, MRA_RAM },
	{ 0x2000, 0x3fff, MRA_BANK1 },				/* banked ROM */
	{ 0x5f80, 0x5f80, input_port_2_r },			/* DIPSW #3 */
	{ 0x5f81, 0x5f81, input_port_3_r },			/* Player 1 inputs */
	{ 0x5f82, 0x5f82, input_port_4_r },			/* Player 2 inputs */
	{ 0x5f83, 0x5f83, input_port_1_r },			/* DIPSW #2 */
	{ 0x5f84, 0x5f84, input_port_0_r },			/* DIPSW #1 */
	{ 0x5f88, 0x5f88, watchdog_reset_r },
	{ 0x4000, 0x7fff, K052109_051960_r },
	{ 0x8000, 0xffff, MRA_ROM },				/* ROM e24_j02.bin */
MEMORY_END

static MEMORY_WRITE_START( aliens_writemem )
	{ 0x0000, 0x03ff, bankedram_w, &ram },			/* palette + work RAM */
	{ 0x0400, 0x1fff, MWA_RAM },
	{ 0x2000, 0x3fff, MWA_ROM },					/* banked ROM */
	{ 0x5f88, 0x5f88, aliens_coin_counter_w },		/* coin counters */
	{ 0x5f8c, 0x5f8c, aliens_sh_irqtrigger_w },		/* cause interrupt on audio CPU */
	{ 0x4000, 0x7fff, K052109_051960_w },
	{ 0x8000, 0xffff, MWA_ROM },					/* ROM e24_j02.bin */
MEMORY_END

static MEMORY_READ_START( aliens_readmem_sound )
	{ 0x0000, 0x7fff, MRA_ROM },				/* ROM g04_b03.bin */
	{ 0x8000, 0x87ff, MRA_RAM },				/* RAM */
	{ 0xa001, 0xa001, YM2151_status_port_0_r },
	{ 0xc000, 0xc000, soundlatch_r },			/* soundlatch_r */
	{ 0xe000, 0xe00d, K007232_read_port_0_r },
MEMORY_END

static MEMORY_WRITE_START( aliens_writemem_sound )
	{ 0x0000, 0x7fff, MWA_ROM },					/* ROM g04_b03.bin */
	{ 0x8000, 0x87ff, MWA_RAM },					/* RAM */
	{ 0xa000, 0xa000, YM2151_register_port_0_w },
	{ 0xa001, 0xa001, YM2151_data_port_0_w },
	{ 0xe000, 0xe00d, K007232_write_port_0_w },
MEMORY_END

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

	Input Ports

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

INPUT_PORTS_START( aliens )
	PORT_START	/* DSW #1 */
	PORT_DIPNAME( 0x0f, 0x0f, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x02, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x05, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x04, DEF_STR( 3C_2C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( 4C_3C ) )
	PORT_DIPSETTING(    0x0f, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 3C_4C ) )
	PORT_DIPSETTING(    0x07, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0x0e, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x06, DEF_STR( 2C_5C ) )
	PORT_DIPSETTING(    0x0d, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x0c, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x0b, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(    0x0a, DEF_STR( 1C_6C ) )
	PORT_DIPSETTING(    0x09, DEF_STR( 1C_7C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ) )
	PORT_DIPNAME( 0xf0, 0xf0, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x50, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x80, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x40, DEF_STR( 3C_2C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 4C_3C ) )
	PORT_DIPSETTING(    0xf0, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 3C_4C ) )
	PORT_DIPSETTING(    0x70, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0xe0, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x60, DEF_STR( 2C_5C ) )
	PORT_DIPSETTING(    0xd0, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0xc0, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0xb0, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(    0xa0, DEF_STR( 1C_6C ) )
	PORT_DIPSETTING(    0x90, DEF_STR( 1C_7C ) )
//	PORT_DIPSETTING(    0x00, "Invalid" )

	PORT_START	/* DSW #2 */
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x03, "1" )
	PORT_DIPSETTING(    0x02, "2" )
	PORT_DIPSETTING(    0x01, "3" )
	PORT_DIPSETTING(    0x00, "5" )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x60, 0x40, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(	0x60, "Easy" )
	PORT_DIPSETTING(	0x40, "Normal" )
	PORT_DIPSETTING(	0x20, "Difficult" )
	PORT_DIPSETTING(	0x00, "Very Difficult" )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(	0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(	0x00, DEF_STR( On ) )

	PORT_START	/* DSW #3 */
	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Flip_Screen ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_SERVICE( 0x04, IP_ACTIVE_LOW )
	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START	/* PLAYER 1 INPUTS */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START1 )

	PORT_START	/* PLAYER 2 INPUTS */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )
INPUT_PORTS_END


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

	Machine Driver

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

static void volume_callback(int v)
{
	K007232_set_volume(0,0,(v & 0x0f) * 0x11,0);
	K007232_set_volume(0,1,0,(v >> 4) * 0x11);
}

static struct K007232_interface k007232_interface =
{
	1,		/* number of chips */
	3579545,	/* clock */
	{ REGION_SOUND1 },	/* memory regions */
	{ K007232_VOL(20,MIXER_PAN_CENTER,20,MIXER_PAN_CENTER) },	/* volume */
	{ volume_callback }	/* external port callback */
};

static struct YM2151interface ym2151_interface =
{
	1, /* 1 chip */
	3579545, /* 3.579545 MHz */
	{ YM3012_VOL(60,MIXER_PAN_LEFT,60,MIXER_PAN_RIGHT) },
	{ 0 },
	{ aliens_snd_bankswitch_w }
};

static MACHINE_DRIVER_START( aliens )

	/* basic machine hardware */
	MDRV_CPU_ADD(KONAMI, 3000000)		/* ? */
	MDRV_CPU_MEMORY(aliens_readmem,aliens_writemem)
	MDRV_CPU_VBLANK_INT(aliens_interrupt,1)

	MDRV_CPU_ADD(Z80, 3579545*2)
	MDRV_CPU_FLAGS(CPU_AUDIO_CPU)		/* ? */
	MDRV_CPU_MEMORY(aliens_readmem_sound,aliens_writemem_sound)

	MDRV_FRAMES_PER_SECOND(60)
	MDRV_VBLANK_DURATION(DEFAULT_60HZ_VBLANK_DURATION)

	MDRV_MACHINE_INIT(aliens)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_HAS_SHADOWS)
	MDRV_SCREEN_SIZE(64*8, 32*8)
	MDRV_VISIBLE_AREA(14*8, (64-14)*8-1, 2*8, 30*8-1 )
	MDRV_PALETTE_LENGTH(512)

	MDRV_VIDEO_START(aliens)
	MDRV_VIDEO_UPDATE(aliens)

	/* sound hardware */
	MDRV_SOUND_ADD(YM2151, ym2151_interface)
	MDRV_SOUND_ADD(K007232, k007232_interface)
MACHINE_DRIVER_END


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

  Game ROMs

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

ROM_START( aliens )
	ROM_REGION( 0x38000, REGION_CPU1, 0 ) /* code + banked roms */
	ROM_LOAD( "e24_j02.bin", 0x10000, 0x08000, 0x56c20971 )
	ROM_CONTINUE(            0x08000, 0x08000 )
	ROM_LOAD( "c24_j01.bin", 0x18000, 0x20000, 0x6a529cd6 )

	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 64k for the sound CPU */
	ROM_LOAD( "g04_b03.bin", 0x00000, 0x08000, 0x1ac4d283 )

	ROM_REGION( 0x200000, REGION_GFX1, 0 ) /* graphics */
	ROM_LOAD( "k13_b11.bin", 0x000000, 0x80000, 0x89c5c885 )	/* characters (set 1) */
	ROM_LOAD( "j13_b07.bin", 0x080000, 0x40000, 0xe9c56d66 )	/* characters (set 2) */
	/* second half empty */
	ROM_LOAD( "k19_b12.bin", 0x100000, 0x80000, 0xea6bdc17 )	/* characters (set 1) */
	ROM_LOAD( "j19_b08.bin", 0x180000, 0x40000, 0xf9387966 )	/* characters (set 2) */
	/* second half empty */

	ROM_REGION( 0x200000, REGION_GFX2, 0 ) /* graphics */
	ROM_LOAD( "k08_b10.bin", 0x000000, 0x80000, 0x0b1035b1 )	/* sprites (set 1) */
	ROM_LOAD( "j08_b06.bin", 0x080000, 0x40000, 0x081a0566 )	/* sprites (set 2) */
	/* second half empty */
	ROM_LOAD( "k02_b09.bin", 0x100000, 0x80000, 0xe76b3c19 )	/* sprites (set 1) */
	ROM_LOAD( "j02_b05.bin", 0x180000, 0x40000, 0x19a261f2 )	/* sprites (set 2) */
	/* second half empty */

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "821a08.h14",  0x0000, 0x0100, 0x7da55800 )	/* priority encoder (not used) */

	ROM_REGION( 0x40000, REGION_SOUND1, 0 ) /* samples for 007232 */
	ROM_LOAD( "875b04.bin",  0x00000, 0x40000, 0x4e209ac8 )
ROM_END

ROM_START( aliens2 )
	ROM_REGION( 0x38000, REGION_CPU1, 0 ) /* code + banked roms */
	ROM_LOAD( "e24_p02.bin", 0x10000, 0x08000, 0x4edd707d )
	ROM_CONTINUE(            0x08000, 0x08000 )
	ROM_LOAD( "c24_n01.bin", 0x18000, 0x20000, 0x106cf59c )

	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 64k for the sound CPU */
	ROM_LOAD( "g04_b03.bin", 0x00000, 0x08000, 0x1ac4d283 )

	ROM_REGION( 0x200000, REGION_GFX1, 0 ) /* graphics */
	ROM_LOAD( "k13_b11.bin", 0x000000, 0x80000, 0x89c5c885 )	/* characters (set 1) */
	ROM_LOAD( "j13_b07.bin", 0x080000, 0x40000, 0xe9c56d66 )	/* characters (set 2) */
	/* second half empty */
	ROM_LOAD( "k19_b12.bin", 0x100000, 0x80000, 0xea6bdc17 )	/* characters (set 1) */
	ROM_LOAD( "j19_b08.bin", 0x180000, 0x40000, 0xf9387966 )	/* characters (set 2) */
	/* second half empty */

	ROM_REGION( 0x200000, REGION_GFX2, 0 ) /* graphics */
	ROM_LOAD( "k08_b10.bin", 0x000000, 0x80000, 0x0b1035b1 )	/* sprites (set 1) */
	ROM_LOAD( "j08_b06.bin", 0x080000, 0x40000, 0x081a0566 )	/* sprites (set 2) */
	/* second half empty */
	ROM_LOAD( "k02_b09.bin", 0x100000, 0x80000, 0xe76b3c19 )	/* sprites (set 1) */
	ROM_LOAD( "j02_b05.bin", 0x180000, 0x40000, 0x19a261f2 )	/* sprites (set 2) */
	/* second half empty */

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "821a08.h14",  0x0000, 0x0100, 0x7da55800 )	/* priority encoder (not used) */

	ROM_REGION( 0x40000, REGION_SOUND1, 0 ) /* samples for 007232 */
	ROM_LOAD( "875b04.bin",  0x00000, 0x40000, 0x4e209ac8 )
ROM_END

ROM_START( aliensu )
	ROM_REGION( 0x38000, REGION_CPU1, 0 ) /* code + banked roms */
	ROM_LOAD( "e24_n02.bin", 0x10000, 0x08000, 0x24dd612e )
	ROM_CONTINUE(            0x08000, 0x08000 )
	ROM_LOAD( "c24_n01.bin", 0x18000, 0x20000, 0x106cf59c )

	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 64k for the sound CPU */
	ROM_LOAD( "g04_b03.bin", 0x00000, 0x08000, 0x1ac4d283 )

	ROM_REGION( 0x200000, REGION_GFX1, 0 ) /* graphics */
	ROM_LOAD( "k13_b11.bin", 0x000000, 0x80000, 0x89c5c885 )	/* characters (set 1) */
	ROM_LOAD( "j13_b07.bin", 0x080000, 0x40000, 0xe9c56d66 )	/* characters (set 2) */
	/* second half empty */
	ROM_LOAD( "k19_b12.bin", 0x100000, 0x80000, 0xea6bdc17 )	/* characters (set 1) */
	ROM_LOAD( "j19_b08.bin", 0x180000, 0x40000, 0xf9387966 )	/* characters (set 2) */
	/* second half empty */

	ROM_REGION( 0x200000, REGION_GFX2, 0 ) /* graphics */
	ROM_LOAD( "k08_b10.bin", 0x000000, 0x80000, 0x0b1035b1 )	/* sprites (set 1) */
	ROM_LOAD( "j08_b06.bin", 0x080000, 0x40000, 0x081a0566 )	/* sprites (set 2) */
	/* second half empty */
	ROM_LOAD( "k02_b09.bin", 0x100000, 0x80000, 0xe76b3c19 )	/* sprites (set 1) */
	ROM_LOAD( "j02_b05.bin", 0x180000, 0x40000, 0x19a261f2 )	/* sprites (set 2) */
	/* second half empty */

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "821a08.h14",  0x0000, 0x0100, 0x7da55800 )	/* priority encoder (not used) */

	ROM_REGION( 0x40000, REGION_SOUND1, 0 ) /* samples for 007232 */
	ROM_LOAD( "875b04.bin",  0x00000, 0x40000, 0x4e209ac8 )
ROM_END

ROM_START( aliensj )
	ROM_REGION( 0x38000, REGION_CPU1, 0 ) /* code + banked roms */
	ROM_LOAD( "875m02.e24",  0x10000, 0x08000, 0x54a774e5 )
	ROM_CONTINUE(            0x08000, 0x08000 )
	ROM_LOAD( "875m01.c24",  0x18000, 0x20000, 0x1663d3dc )

	ROM_REGION( 0x10000, REGION_CPU2, 0 ) /* 64k for the sound CPU */
	ROM_LOAD( "875k03.g4",   0x00000, 0x08000, 0xbd86264d )

	ROM_REGION( 0x200000, REGION_GFX1, 0 ) /* graphics */
	ROM_LOAD( "k13_b11.bin", 0x000000, 0x80000, 0x89c5c885 )	/* characters (set 1) */
	ROM_LOAD( "j13_b07.bin", 0x080000, 0x40000, 0xe9c56d66 )	/* characters (set 2) */
	/* second half empty */
	ROM_LOAD( "k19_b12.bin", 0x100000, 0x80000, 0xea6bdc17 )	/* characters (set 1) */
	ROM_LOAD( "j19_b08.bin", 0x180000, 0x40000, 0xf9387966 )	/* characters (set 2) */
	/* second half empty */

	ROM_REGION( 0x200000, REGION_GFX2, 0 ) /* graphics */
	ROM_LOAD( "k08_b10.bin", 0x000000, 0x80000, 0x0b1035b1 )	/* sprites (set 1) */
	ROM_LOAD( "j08_b06.bin", 0x080000, 0x40000, 0x081a0566 )	/* sprites (set 2) */
	/* second half empty */
	ROM_LOAD( "k02_b09.bin", 0x100000, 0x80000, 0xe76b3c19 )	/* sprites (set 1) */
	ROM_LOAD( "j02_b05.bin", 0x180000, 0x40000, 0x19a261f2 )	/* sprites (set 2) */
	/* second half empty */

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "821a08.h14",  0x0000, 0x0100, 0x7da55800 )	/* priority encoder (not used) */

	ROM_REGION( 0x40000, REGION_SOUND1, 0 ) /* samples for 007232 */
	ROM_LOAD( "875b04.bin",  0x00000, 0x40000, 0x4e209ac8 )
ROM_END


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

  Game driver(s)

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

static void aliens_banking( int lines )
{
	unsigned char *RAM = memory_region(REGION_CPU1);
	int offs = 0x18000;


	if (lines & 0x10) offs -= 0x8000;

	offs += (lines & 0x0f)*0x2000;
	cpu_setbank( 1, &RAM[offs] );
}

static MACHINE_INIT( aliens )
{
	unsigned char *RAM = memory_region(REGION_CPU1);

	konami_cpu_setlines_callback = aliens_banking;

	/* init the default bank */
	cpu_setbank( 1, &RAM[0x10000] );
}



static DRIVER_INIT( aliens )
{
	konami_rom_deinterleave_2(REGION_GFX1);
	konami_rom_deinterleave_2(REGION_GFX2);
}



GAME( 1990, aliens,  0,      aliens, aliens, aliens, ROT0, "Konami", "Aliens (World set 1)" )
GAME( 1990, aliens2, aliens, aliens, aliens, aliens, ROT0, "Konami", "Aliens (World set 2)" )
GAME( 1990, aliensu, aliens, aliens, aliens, aliens, ROT0, "Konami", "Aliens (US)" )
GAME( 1990, aliensj, aliens, aliens, aliens, aliens, ROT0, "Konami", "Aliens (Japan)" )
