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

  Capcom Baseball


  Somewhat similar to the "Mitchell hardware", but different enough to
  deserve its own driver.

TODO:
- understand what bit 6 of input port 0x12 is
- unknown bit 5 of bankswitch register

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

#include "driver.h"
#include "cpu/z80/z80.h"
#include "includes/cps1.h"
#include "machine/eeprom.h"
#include "sound/okim6295.h"
#include "sound/2413intf.h"


VIDEO_START( cbasebal );
WRITE8_HANDLER( cbasebal_textram_w );
READ8_HANDLER( cbasebal_textram_r );
WRITE8_HANDLER( cbasebal_scrollram_w );
READ8_HANDLER( cbasebal_scrollram_r );
WRITE8_HANDLER( cbasebal_gfxctrl_w );
WRITE8_HANDLER( cbasebal_scrollx_w );
WRITE8_HANDLER( cbasebal_scrolly_w );
VIDEO_UPDATE( cbasebal );


static UINT8 rambank;

static WRITE8_HANDLER( cbasebal_bankswitch_w )
{
	/* bits 0-4 select ROM bank */
//logerror("%04x: bankswitch %02x\n",cpu_get_pc(space->cpu),data);
	memory_set_bank(space->machine, 1, data & 0x1f);

	/* bit 5 used but unknown */

	/* bits 6-7 select RAM bank */
	rambank = (data & 0xc0) >> 6;
}


static READ8_HANDLER( bankedram_r )
{
	if (rambank == 2)
		return cbasebal_textram_r(space,offset);	/* VRAM */
	else if (rambank == 1)
	{
		if (offset < 0x800)
			return paletteram[offset];
		else return 0;
	}
	else
	{
		return cbasebal_scrollram_r(space,offset);	/* SCROLL */
	}
}

static WRITE8_HANDLER( bankedram_w )
{
	if (rambank == 2)
		cbasebal_textram_w(space,offset,data);
	else if (rambank == 1)
	{
		if (offset < 0x800)
			paletteram_xxxxBBBBRRRRGGGG_le_w(space,offset,data);
	}
	else
		cbasebal_scrollram_w(space,offset,data);
}

static WRITE8_HANDLER( cbasebal_coinctrl_w )
{
	coin_lockout_w(0,~data & 0x04);
	coin_lockout_w(1,~data & 0x08);
	coin_counter_w(0,data & 0x01);
	coin_counter_w(1,data & 0x02);
}



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

  EEPROM

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

static const eeprom_interface eeprom_intf =
{
	6,		/* address bits */
	16,		/* data bits */
	"0110",	/*  read command */
	"0101",	/* write command */
	"0111"	/* erase command */
};


static NVRAM_HANDLER( cbasebal )
{
	if (read_or_write)
		eeprom_save(file);
	else
	{
		eeprom_init(machine, &eeprom_intf);

		if (file)
			eeprom_load(file);
	}
}

static WRITE8_HANDLER( eeprom_cs_w )
{
	eeprom_set_cs_line(data ? CLEAR_LINE : ASSERT_LINE);
}

static WRITE8_HANDLER( eeprom_clock_w )
{
	eeprom_set_clock_line(data ? CLEAR_LINE : ASSERT_LINE);
}

static WRITE8_HANDLER( eeprom_serial_w )
{
	eeprom_write_bit(data);
}



static ADDRESS_MAP_START( cbasebal_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK(1)
	AM_RANGE(0xc000, 0xcfff) AM_READWRITE(bankedram_r, bankedram_w) AM_BASE(&paletteram)	/* palette + vram + scrollram */
	AM_RANGE(0xe000, 0xfdff) AM_RAM		/* work RAM */
	AM_RANGE(0xfe00, 0xffff) AM_RAM AM_BASE(&spriteram) AM_SIZE(&spriteram_size)
ADDRESS_MAP_END

static ADDRESS_MAP_START( cbasebal_portmap, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_WRITE(cbasebal_bankswitch_w)
	AM_RANGE(0x01, 0x01) AM_WRITE(eeprom_cs_w)
	AM_RANGE(0x02, 0x02) AM_WRITE(eeprom_clock_w)
	AM_RANGE(0x03, 0x03) AM_WRITE(eeprom_serial_w)
	AM_RANGE(0x05, 0x05) AM_DEVWRITE("oki", okim6295_w)
	AM_RANGE(0x06, 0x07) AM_DEVWRITE("ym", ym2413_w)
	AM_RANGE(0x08, 0x09) AM_WRITE(cbasebal_scrollx_w)
	AM_RANGE(0x0a, 0x0b) AM_WRITE(cbasebal_scrolly_w)
	AM_RANGE(0x10, 0x10) AM_READ_PORT("P1")
	AM_RANGE(0x11, 0x11) AM_READ_PORT("P2")
	AM_RANGE(0x12, 0x12) AM_READ_PORT("SYSTEM")
	AM_RANGE(0x13, 0x13) AM_WRITE(cbasebal_gfxctrl_w)
	AM_RANGE(0x14, 0x14) AM_WRITE(cbasebal_coinctrl_w)
ADDRESS_MAP_END


static INPUT_PORTS_START( cbasebal )
	PORT_START("P1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON3 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY

	PORT_START("P2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)

	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_COIN3 )
	PORT_SERVICE( 0x08, IP_ACTIVE_LOW )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_VBLANK )		/* ? */
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM(eeprom_bit_r, NULL)
INPUT_PORTS_END




static const gfx_layout cbasebal_textlayout =
{
	8,8,	/* 8*8 characters */
	4096,	/* 4096 characters */
	2,		/* 2 bits per pixel */
	{ 0, 4 },
	{ 8+3, 8+2, 8+1, 8+0, 3, 2, 1, 0 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16 },
	16*8    /* every char takes 16 consecutive bytes */
};

static const gfx_layout cbasebal_tilelayout =
{
	16,16,	/* 16*16 tiles */
	4096,	/* 4096 tiles */
	4,		/* 4 bits per pixel */
	{ 4096*64*8+4, 4096*64*8+0,4, 0 },
	{ 0, 1, 2, 3, 8+0, 8+1, 8+2, 8+3,
			16*16+0, 16*16+1, 16*16+2, 16*16+3, 16*16+8+0, 16*16+8+1, 16*16+8+2, 16*16+8+3 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,
			8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16 },
	64*8    /* every tile takes 64 consecutive bytes */
};

static const gfx_layout cbasebal_spritelayout =
{
	16,16,  /* 16*16 sprites */
	4096,   /* 2048 sprites */
	4,      /* 4 bits per pixel */
	{ 4096*64*8+4, 4096*64*8+0, 4, 0 },
	{ 0, 1, 2, 3, 8+0, 8+1, 8+2, 8+3,
			32*8+0, 32*8+1, 32*8+2, 32*8+3, 33*8+0, 33*8+1, 33*8+2, 33*8+3 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,
			8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16 },
	64*8    /* every sprite takes 64 consecutive bytes */
};

static GFXDECODE_START( cbasebal )
	GFXDECODE_ENTRY( "gfx1", 0, cbasebal_textlayout,   256,  8 ) /* colors 256- 287 */
	GFXDECODE_ENTRY( "gfx2", 0, cbasebal_tilelayout,   768, 16 ) /* colors 768-1023 */
	GFXDECODE_ENTRY( "gfx3", 0, cbasebal_spritelayout, 512,  8 ) /* colors 512- 639 */
GFXDECODE_END



static MACHINE_DRIVER_START( cbasebal )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", Z80, 6000000)	/* ??? */
	MDRV_CPU_PROGRAM_MAP(cbasebal_map)
	MDRV_CPU_IO_MAP(cbasebal_portmap)
	MDRV_CPU_VBLANK_INT("screen", irq0_line_hold)	/* ??? */

	MDRV_NVRAM_HANDLER(cbasebal)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_UPDATE_BEFORE_VBLANK)

	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*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(8*8, (64-8)*8-1, 2*8, 30*8-1 )

	MDRV_GFXDECODE(cbasebal)
	MDRV_PALETTE_LENGTH(1024)

	MDRV_VIDEO_START(cbasebal)
	MDRV_VIDEO_UPDATE(cbasebal)

	/* 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", 0.50)

	MDRV_SOUND_ADD("ym", YM2413, 3579545)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END



ROM_START( cbasebal )
	ROM_REGION( 0x90000, "maincpu", 0 )
	ROM_LOAD( "cbj10.11j",    0x00000, 0x08000, CRC(bbff0acc) SHA1(db9e2c89e030255851789caaf85f24dc73609d9b) )
	ROM_LOAD( "cbj07.16f",    0x10000, 0x20000, CRC(8111d13f) SHA1(264e21e824c87f55da326440c6ed71e1c287a63e) )
	ROM_LOAD( "cbj06.14f",    0x30000, 0x20000, CRC(9aaa0e37) SHA1(1a7b96b44c66b58f06707aafb1806520747b8c76) )
	ROM_LOAD( "cbj05.13f",    0x50000, 0x20000, CRC(d0089f37) SHA1(32354c3f4693a65e297791c4d8faac3aa9cff5a1) )
	/* 0x70000-0x8ffff empty (space for 04) */

	ROM_REGION( 0x10000, "gfx1", ROMREGION_DISPOSE )
	ROM_LOAD( "cbj13.16m",    0x00000, 0x10000, CRC(2359fa0a) SHA1(3a37532ea43dd4b150c53a240d35a57a9b76d23d) )	/* text */

	ROM_REGION( 0x80000, "gfx2", ROMREGION_DISPOSE )
	ROM_LOAD( "cbj02.1f",     0x00000, 0x20000, CRC(d6740535) SHA1(2ece885525718fd5fe52b8fa4c07930695b89659) )	/* tiles */
	ROM_LOAD( "cbj03.2f",     0x20000, 0x20000, CRC(88098dcd) SHA1(caddebeea581129d6a62fc9f7f354d61eef175c7) )
	ROM_LOAD( "cbj08.1j",     0x40000, 0x20000, CRC(5f3344bf) SHA1(1d3193078108e86e31bbfce15a8d2443cfbf2ff6) )
	ROM_LOAD( "cbj09.2j",     0x60000, 0x20000, CRC(aafffdae) SHA1(26e76b55fff49811df8e5b1f165be20ec8dd196a) )

	ROM_REGION( 0x80000, "gfx3", ROMREGION_DISPOSE )
	ROM_LOAD( "cbj11.1m",     0x00000, 0x20000, CRC(bdc1507d) SHA1(efeaf3066acfb7186d73ad8e5b291d6e61965de2) )	/* sprites */
	ROM_LOAD( "cbj12.2m",     0x20000, 0x20000, CRC(973f3efe) SHA1(d776499d5ac4bc23eb5d1f28b88447cc07d8ac99) )
	ROM_LOAD( "cbj14.1n",     0x40000, 0x20000, CRC(765dabaa) SHA1(742d1c50b65f649f23eac7976fe26c2d7400e4e1) )
	ROM_LOAD( "cbj15.2n",     0x60000, 0x20000, CRC(74756de5) SHA1(791d6620cdb563f0b3a717432aa4647981b0a10e) )

	ROM_REGION( 0x80000, "oki", 0 )	/* OKIM */
	ROM_LOAD( "cbj01.1e",     0x00000, 0x20000, CRC(1d8968bd) SHA1(813e475d1d0c343e7dad516f1fe564d00c9c27fb) )
ROM_END


static DRIVER_INIT( cbasebal )
{
	memory_configure_bank(machine, 1, 0, 32, memory_region(machine, "maincpu") + 0x10000, 0x4000);
	pang_decode(machine);
}


GAME( 1989, cbasebal, 0, cbasebal, cbasebal, cbasebal, ROT0, "Capcom", "Capcom Baseball (Japan)", 0 )
