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

Irem Red Alert Driver

Everything in this driver is guesswork and speculation.  If something
seems wrong, it probably is.

If you have any questions about how this driver works, don't hesitate to
ask.  - Mike Balfour (mab22@po.cwru.edu)
***************************************************************************/

#include "driver.h"
#include "vidhrdw/generic.h"

/* vidhrdw/redalert.c */
extern unsigned char *redalert_backram;
extern unsigned char *redalert_spriteram1;
extern unsigned char *redalert_spriteram2;
extern unsigned char *redalert_characterram;
extern void redalert_backram_w(int offset, int data);
extern void redalert_spriteram1_w(int offset, int data);
extern void redalert_spriteram2_w(int offset, int data);
extern void redalert_characterram_w(int offset, int data);
extern void redalert_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
extern void redalert_c040_w(int offset, int data);
extern void redalert_backcolor_w(int offset, int data);

/* sndhrdw/redalert.c */
void redalert_c030_w(int offset, int data);
int redalert_voicecommand_r(int offset);
void redalert_soundlatch_w(int offset, int data);
int redalert_AY8910_A_r(int offset);
void redalert_AY8910_B_w(int offset, int data);
void redalert_AY8910_w(int offset, int data);
int redalert_sound_register_IC1_r(int offset);
void redalert_sound_register_IC2_w(int offset, int data);


static struct MemoryReadAddress readmem[] =
{
	{ 0x0000, 0x01ff, MRA_RAM }, /* Zero page / stack */
	{ 0x0200, 0x0fff, MRA_RAM }, /* ? */
	{ 0x1000, 0x1fff, MRA_RAM }, /* Scratchpad video RAM */
	{ 0x2000, 0x4fff, MRA_RAM }, /* Video RAM */
	{ 0x5000, 0xbfff, MRA_ROM },
	{ 0xc100, 0xc100, input_port_0_r },
	{ 0xc110, 0xc110, input_port_1_r },
	{ 0xc120, 0xc120, input_port_2_r },
	{ 0xc170, 0xc170, input_port_3_r }, /* Vertical Counter? */
	{ 0xf000, 0xffff, MRA_ROM }, /* remapped ROM for 6502 vectors */
	{ -1 }	/* end of table */
};

static struct MemoryWriteAddress writemem[] =
{
	{ 0x0000, 0x01ff, MWA_RAM },
	{ 0x0200, 0x0fff, MWA_RAM }, /* ? */
	{ 0x1000, 0x1fff, MWA_RAM }, /* Scratchpad video RAM */
	{ 0x2000, 0x3fff, redalert_backram_w, &redalert_backram },
	{ 0x4000, 0x43ff, videoram_w, &videoram, &videoram_size },
	{ 0x4400, 0x47ff, redalert_spriteram1_w, &redalert_spriteram1 },
	{ 0x4800, 0x4bff, redalert_characterram_w, &redalert_characterram },
	{ 0x4c00, 0x4fff, redalert_spriteram2_w, &redalert_spriteram2 },
	{ 0x5000, 0xbfff, MWA_ROM },
	{ 0xc130, 0xc130, redalert_c030_w },
//	{ 0xc140, 0xc140, redalert_c040_w }, /* Output port? */
	{ 0xc150, 0xc150, redalert_backcolor_w },
	{ 0xc160, 0xc160, redalert_soundlatch_w },
	{ 0xf000, 0xffff, MWA_ROM },
	{ -1 }	/* end of table */
};

static struct MemoryReadAddress sound_readmem[] =
{
	{ 0x0000, 0x03ff, MRA_RAM },
	{ 0x7800, 0x7fff, MRA_ROM },
	{ 0xf800, 0xffff, MRA_ROM },
	{ 0x1001, 0x1001, redalert_sound_register_IC1_r },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress sound_writemem[] =
{
	{ 0x0000, 0x03ff, MWA_RAM },
	{ 0x7800, 0x7fff, MWA_ROM },
	{ 0xf800, 0xffff, MWA_ROM },
	{ 0x1000, 0x1000, redalert_AY8910_w },
	{ 0x1001, 0x1001, redalert_sound_register_IC2_w },
	{ -1 }  /* end of table */
};

static struct MemoryReadAddress voice_readmem[] =
{
	{ 0x0000, 0x3fff, MRA_ROM },
	{ 0x8000, 0x83ff, MRA_RAM },
//	{ 0xc000, 0xc000, redalert_voicecommand_r }, /* reads command from D0-D5? */
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress voice_writemem[] =
{
	{ 0x0000, 0x3fff, MWA_ROM },
	{ 0x8000, 0x83ff, MWA_RAM },
	{ -1 }  /* end of table */
};


INPUT_PORTS_START( redalert_input_ports )
	PORT_START			   /* DIP Switches */
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "3" )
	PORT_DIPSETTING(    0x01, "4" )
	PORT_DIPSETTING(    0x02, "5" )
	PORT_DIPSETTING(    0x03, "6" )
	PORT_DIPNAME( 0x04, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x04, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x00, DEF_STR( Bonus_Life ) )
	PORT_DIPSETTING(    0x00, "5000" )
	PORT_DIPSETTING(    0x08, "7000" )
	PORT_DIPNAME( 0x30, 0x10, DEF_STR( Coinage ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ) )
	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
	PORT_SERVICE( 0x80, IP_ACTIVE_HIGH )

	PORT_START			   /* IN1 */
	PORT_BIT ( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
	PORT_BIT ( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
	PORT_BIT ( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 )
	PORT_BIT ( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )
	PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN ) /* Meter */

	PORT_START			   /* IN2  */
	PORT_BIT ( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN ) /* Meter */
	PORT_BIT ( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT ( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_PLAYER2 )
	PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_PLAYER2 )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN ) /* Meter */

	PORT_START			   /* IN3 - some type of video counter? */
	PORT_BIT ( 0x01, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START			   /* Fake input for coins */
	PORT_BIT ( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 )
	PORT_BIT ( 0x02, IP_ACTIVE_HIGH, IPT_SERVICE )
INPUT_PORTS_END


static struct GfxLayout backlayout =
{
	8,8,	/* 8*8 characters */
	0x400,	  /* 1024 characters */
	1,	/* 1 bits per pixel */
	{ 0 }, /* No info needed for bit offsets */
	{ 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 struct GfxLayout charlayout =
{
	8,8,	/* 8*8 characters */
	128,	/* 128 characters */
	1,	/* 1 bits per pixel */
	{ 0 }, /* No info needed for bit offsets */
	{ 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 struct GfxLayout spritelayout =
{
	8,8,	/* 8*8 characters */
	128,	/* 128 characters */
	2,		/* 1 bits per pixel */
	{ 0, 0x800*8 }, /* No info needed for bit offsets */
	{ 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 struct GfxDecodeInfo gfxdecodeinfo[] =
{
	{ 0, 0x3000, &backlayout,	0, 8 }, 	/* the game dynamically modifies this */
	{ 0, 0x4800, &charlayout,	0, 8 }, 	/* the game dynamically modifies this */
	{ 0, 0x4400, &spritelayout,16, 4 }, 	/* the game dynamically modifies this */
	{ -1 } /* end of array */
};

/* Arbitrary colors */
static unsigned char palette[] =
{
	0x40,0x80,0xff,	/* Background */
	0x00,0x00,0xff,	/* Blue */
	0xff,0x00,0xff,	/* Magenta */
	0x00,0xff,0xff,	/* Cyan */
	0xff,0x00,0x00,	/* Red */
	0xff,0x80,0x00,	/* Orange */
	0xff,0xff,0x00,	/* Yellow */
	0xff,0xff,0xff,	/* White */
	0x00,0x00,0x00,	/* Black */
};

/* Arbitrary colortable */
static unsigned short colortable[] =
{
	0,7,
	0,6,
	0,2,
	0,4,
	0,3,
	0,6,
	0,1,
	0,8,

	0,8,8,8,
	0,6,4,7,
	0,6,4,1,
	0,8,5,1,
};

static int redalert_interrupt(void)
{
	static int lastcoin = 0;
	int newcoin;

	newcoin = input_port_4_r(0);

	if (newcoin)
	{
		if ((newcoin & 0x01) && !(lastcoin & 0x01))
		{
			lastcoin = newcoin;
			return nmi_interrupt();
		}
		if ((newcoin & 0x02) && !(lastcoin & 0x02))
		{
			lastcoin = newcoin;
			return nmi_interrupt();
		}
	}

	lastcoin = newcoin;
	return interrupt();
}

static struct AY8910interface ay8910_interface =
{
	1,			/* 1 chip */
	2000000,	/* 2 MHz */
	{ 50 },		/* Volume */
	AY8910_DEFAULT_GAIN,
	{ redalert_AY8910_A_r },		/* Port A Read */
	{ 0 },		/* Port B Read */
	{ 0 },		/* Port A Write */
	{ redalert_AY8910_B_w }		/* Port B Write */
};



static struct MachineDriver machine_driver =
{
	/* basic machine hardware */
	{
		{
			CPU_M6502,
			1000000,	   /* ???? */
			0,
			readmem,writemem,0,0,
			redalert_interrupt,1
		},
		{
			CPU_M6502 | CPU_AUDIO_CPU,
			1000000,	   /* 1 MHz */
			1,
			sound_readmem,sound_writemem,0,0,
			/* IRQ is hooked to a 555 timer, whose freq is 1150 Hz */
			0,0,
			interrupt,1150
		},
		{
			CPU_8085A | CPU_AUDIO_CPU,
			1000000,	   /* 1 MHz? */
			2,
			voice_readmem,voice_writemem,0,0,
			ignore_interrupt,1
		}
	},
	60, DEFAULT_REAL_60HZ_VBLANK_DURATION,	/* frames per second, vblank duration */
	1,      /* 1 CPU slice per frame - interleaving is forced when a sound command is written */
	0,

	/* video hardware */
	32*8, 32*8, { 0*8, 32*8-1, 1*8, 31*8-1 },
	gfxdecodeinfo,
	sizeof(palette)/3,sizeof(colortable)/sizeof(unsigned short),
	0,

	VIDEO_TYPE_RASTER,
	0,
	generic_vh_start,
	generic_vh_stop,
	redalert_vh_screenrefresh,

	/* sound hardware */
	0,0,0,0,
	{
		{
			SOUND_AY8910,
			&ay8910_interface
		}
	}

};


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

  Game ROMs

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

ROM_START( redalert_rom )
	ROM_REGION(0x10000) /* 64k for code */
	ROM_LOAD( "rag5",         	0x5000, 0x1000, 0xd7c9cdd6 )
	ROM_LOAD( "rag6",         	0x6000, 0x1000, 0xcb2a308c )
	ROM_LOAD( "rag7n",        	0x7000, 0x1000, 0x82ab2dae )
	ROM_LOAD( "rag8n",        	0x8000, 0x1000, 0xb80eece9 )
	ROM_RELOAD(                0xf000, 0x1000 )
	ROM_LOAD( "rag9",         	0x9000, 0x1000, 0x2b7d1295 )
	ROM_LOAD( "ragab",        	0xa000, 0x1000, 0xab99f5ed )
	ROM_LOAD( "ragb",         	0xb000, 0x1000, 0x8e0d1661 )

	ROM_REGION(0x10000) /* 64k for code */
	ROM_LOAD( "w3s1",         	0x7800, 0x0800, 0x4af956a5 )
	ROM_RELOAD(                0xf800, 0x0800 )

	ROM_REGION(0x10000) /* 64k for code */
	ROM_LOAD( "ras1b",        	0x0000, 0x1000, 0xec690845 )
	ROM_LOAD( "ras2",         	0x1000, 0x1000, 0xfae94cfc )
	ROM_LOAD( "ras3",         	0x2000, 0x1000, 0x20d56f3e )
	ROM_LOAD( "ras4",         	0x3000, 0x1000, 0x130e66db )
ROM_END

/***************************************************************************
  Hi Score Routines
***************************************************************************/


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

  Game driver(s)

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

struct GameDriver redalert_driver =
{
	__FILE__,
	0,
	"redalert",
	"Red Alert",
	"1981",
	"GDI + Irem",
	"Mike Balfour\nDick Milliken (Information)",
	GAME_IMPERFECT_COLORS,
	&machine_driver,
	0,

	redalert_rom,
	0, 0,
	0,
	0,	/* sound_prom */

	redalert_input_ports,

	0, palette, colortable,
	ORIENTATION_ROTATE_270,
	0, 0
};
