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

Target Hits (c) 1994 Gaelco (Designed & Developed by Zigurat. Produced by Gaelco)

Driver by Manuel Abadia <manu@teleline.es>

The DS5002FP has 32KB undumped gameplay code making the game unplayable :_(

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

#include "driver.h"
#include "deprecat.h"
#include "cpu/m68000/m68000.h"
#include "sound/okim6295.h"

extern UINT16 *targeth_vregs;
extern UINT16 *targeth_videoram;
extern UINT16 *targeth_spriteram;

/* from video/targeth.c */
WRITE16_HANDLER( targeth_vram_w );
VIDEO_START( targeth );
VIDEO_UPDATE( targeth );


static const gfx_layout tilelayout16_0x080000 =
{
	16,16,														/* 16x16 tiles */
	0x080000/32,												/* number of tiles */
	4,															/* bitplanes */
	{ 3*0x080000*8, 2*0x080000*8, 1*0x080000*8, 0*0x080000*8 }, /* plane offsets */
	{ 0,1,2,3,4,5,6,7, 16*8+0,16*8+1,16*8+2,16*8+3,16*8+4,16*8+5,16*8+6,16*8+7 },
	{ 0*8,1*8,2*8,3*8,4*8,5*8,6*8,7*8, 8*8,9*8,10*8,11*8,12*8,13*8,14*8,15*8 },
	32*8
};

static GFXDECODE_START( 0x080000 )
	GFXDECODE_ENTRY( "gfx1", 0x000000, tilelayout16_0x080000, 0, 64 )
GFXDECODE_END


static INTERRUPT_GEN(targeth_interrupt )
{
	switch(cpu_getiloops(device)){
		case 0: /* IRQ 2: drives the game */
			cpu_set_input_line(device, 2, HOLD_LINE);
			break;
		case 1: /* IRQ 4: Read 1P Gun */
			cpu_set_input_line(device, 4, HOLD_LINE);
			break;
		case 2:	/* IRQ 6: Read 2P Gun */
			cpu_set_input_line(device, 6, HOLD_LINE);
			break;
	}
}

static WRITE16_HANDLER( OKIM6295_bankswitch_w )
{
	UINT8 *RAM = memory_region(space->machine, "oki");

	if (ACCESSING_BITS_0_7){
		memcpy(&RAM[0x30000], &RAM[0x40000 + (data & 0x0f)*0x10000], 0x10000);
	}
}

static WRITE16_HANDLER( targeth_coin_counter_w )
{
	coin_counter_w( (offset >> 3) & 0x01, data & 0x01);
}

static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x0fffff) AM_ROM
	AM_RANGE(0x100000, 0x103fff) AM_RAM_WRITE(targeth_vram_w) AM_BASE(&targeth_videoram)	/* Video RAM */
	AM_RANGE(0x108000, 0x108007) AM_WRITE(SMH_RAM) AM_BASE(&targeth_vregs)	/* Video Registers */
	AM_RANGE(0x108000, 0x108001) AM_READ_PORT("GUNX1")
	AM_RANGE(0x108002, 0x108003) AM_READ_PORT("GUNY1")
	AM_RANGE(0x108004, 0x108005) AM_READ_PORT("GUNX2")
	AM_RANGE(0x108006, 0x108007) AM_READ_PORT("GUNY2")
	AM_RANGE(0x108000, 0x108007) AM_WRITE(SMH_RAM) AM_BASE(&targeth_vregs)	/* Video Registers */
	AM_RANGE(0x10800c, 0x10800d) AM_WRITE(SMH_NOP)					/* CLR Video INT */
	AM_RANGE(0x200000, 0x2007ff) AM_RAM_WRITE(paletteram16_xBBBBBGGGGGRRRRR_word_w) AM_BASE(&paletteram16)	/* Palette */
	AM_RANGE(0x440000, 0x440fff) AM_RAM AM_BASE(&targeth_spriteram)	/* Sprite RAM */
	AM_RANGE(0x700000, 0x700001) AM_READ_PORT("DSW2")
	AM_RANGE(0x700002, 0x700003) AM_READ_PORT("DSW1")
	AM_RANGE(0x700006, 0x700007) AM_READ_PORT("SYSTEM")				/* Coins, Start & Fire buttons */
	AM_RANGE(0x700008, 0x700009) AM_READ_PORT("SERVICE")			/* Service & Guns Reload? */
	AM_RANGE(0x70000a, 0x70001b) AM_WRITE(SMH_NOP)					/* ??? Guns reload related? */
	AM_RANGE(0x70000c, 0x70000d) AM_WRITE(OKIM6295_bankswitch_w)	/* OKI6295 bankswitch */
	AM_RANGE(0x70000e, 0x70000f) AM_DEVREADWRITE8("oki", okim6295_r, okim6295_w, 0x00ff)	/* OKI6295 status register */
	AM_RANGE(0x70002a, 0x70003b) AM_WRITE(targeth_coin_counter_w)	/* Coin counters */
	AM_RANGE(0xfe0000, 0xfeffff) AM_RAM								/* Work RAM (partially shared with DS5002FP) */
ADDRESS_MAP_END

static INPUT_PORTS_START( targeth )
	PORT_START("GUNX1")
	PORT_BIT( 0x01ff, 200, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.05, -0.028, 0) PORT_MINMAX( 0, 400 + 4) PORT_SENSITIVITY(100) PORT_KEYDELTA(20) PORT_PLAYER(1)
	PORT_BIT( 0xfe00, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START("GUNY1")
	PORT_BIT( 0x01ff, 128, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.041, -0.011, 0) PORT_MINMAX(4,255) PORT_SENSITIVITY(100) PORT_KEYDELTA(20) PORT_PLAYER(1)
	PORT_BIT( 0xfe00, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START("GUNX2")
	PORT_BIT( 0x01ff, 400 + 4, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.05, -0.028, 0) PORT_MINMAX( 0, 400 + 4) PORT_SENSITIVITY(100) PORT_KEYDELTA(20) PORT_PLAYER(2)
	PORT_BIT( 0xfe00, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START("GUNY2")
	PORT_BIT( 0x01ff, 255, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.041, -0.011, 0) PORT_MINMAX(4,255) PORT_SENSITIVITY(100) PORT_KEYDELTA(20) PORT_PLAYER(2)
	PORT_BIT( 0xfe00, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START("DSW1")
	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x02, DEF_STR( 6C_1C ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 5C_1C ) )
	PORT_DIPSETTING(    0x04, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x05, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x06, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( 3C_2C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 4C_3C ) )
	PORT_DIPSETTING(    0x07, DEF_STR( 1C_1C ) )
	PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(    0x38, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 3C_4C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x28, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x18, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x40, 0x40, "Credit configuration" )
	PORT_DIPSETTING(    0x40, "Start 1C/Continue 1C" )
	PORT_DIPSETTING(    0x00, "Start 2C/Continue 1C" )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Free_Play ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )

	PORT_START("DSW2")
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x03, DEF_STR( Normal ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Hard ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Hardest ) )
	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( 0x20, 0x20, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, "Gun alarm" )	/* This doesn't work. What's supposed to do? */
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )

	PORT_START("SYSTEM")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )

	PORT_START("SERVICE")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )	/* this MUST be low or the game doesn't boot */
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)	/* Reload 1P? */
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)	/* Reload 2P? */
	PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNKNOWN )
INPUT_PORTS_END


static MACHINE_DRIVER_START( targeth )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", M68000,24000000/2)			/* 12 MHz */
	MDRV_CPU_PROGRAM_MAP(main_map,0)
	MDRV_CPU_VBLANK_INT_HACK(targeth_interrupt,3)

	/* video hardware */
	MDRV_SCREEN_ADD("screen", RASTER)
	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500) /* not accurate */)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(64*16, 32*16)				/* 1024x512 */
	MDRV_SCREEN_VISIBLE_AREA(0, 24*16-1, 16, 16*16-1)	/* 400x240 */

	MDRV_GFXDECODE(0x080000)
	MDRV_PALETTE_LENGTH(1024)

	MDRV_VIDEO_START(targeth)
	MDRV_VIDEO_UPDATE(targeth)

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

	MDRV_SOUND_ADD("oki", OKIM6295, 1056000)
	MDRV_SOUND_CONFIG(okim6295_interface_pin7high) // clock frequency & pin 7 not verified
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END

ROM_START( targeth )
	ROM_REGION( 0x100000, "maincpu", 0 )	/* 68000 code */
	ROM_LOAD16_BYTE(	"targeth.c23",	0x000000, 0x040000, CRC(840887d6) SHA1(9a36b346608d531a62a2e0704ea44f12e07f9d91) )
	ROM_LOAD16_BYTE(	"targeth.c22",	0x000001, 0x040000, CRC(d2435eb8) SHA1(ce75a115dad8019c8e66a1c3b3e15f54781f65ae) )

	ROM_REGION( 0x200000, "gfx1", ROMREGION_DISPOSE )	/* Graphics */
	ROM_LOAD( "targeth.i13",	0x000000, 0x080000, CRC(b892be24) SHA1(9cccaaacf20e77c7358f0ceac60b8a1012f1216c) )
	ROM_LOAD( "targeth.i11",	0x080000, 0x080000, CRC(6797faf9) SHA1(112cffe72f91cb46c262e19a47b0cab3237dd60f) )
	ROM_LOAD( "targeth.i9",		0x100000, 0x080000, CRC(0e922c1c) SHA1(6920e345c82e76f7e0af6101f39eb65ac1f112b9) )
	ROM_LOAD( "targeth.i7",		0x180000, 0x080000, CRC(d8b41000) SHA1(cbe91eb91bdc7a60b2333c6bea37d08a57902669) )

	ROM_REGION( 0x140000, "oki", 0 )	/* ADPCM samples - sound chip is OKIM6295 */
	ROM_LOAD( "targeth.c1",		0x000000, 0x080000, CRC(d6c9dfbc) SHA1(3ec70dea94fc89df933074012a52de6034571e87) )
	/* 0x00000-0x2ffff is fixed, 0x30000-0x3ffff is bank switched from all the ROMs */
	ROM_RELOAD(					0x040000, 0x080000 )
	ROM_LOAD( "targeth.c3",		0x0c0000, 0x080000, CRC(d4c771df) SHA1(7cc0a86ef6aa3d26ab8f19d198f62112bf012870) )
ROM_END

GAME( 1994, targeth, 0, targeth,targeth, 0, ROT0, "Gaelco", "Target Hits", GAME_UNEMULATED_PROTECTION )
