// license:BSD-3-Clause
// copyright-holders:Angelo Salese
/***************************************************************************

    Skeleton driver for XaviX TV PNP console and childs (Let's! Play TV Classic)

    CPU is M6502 derivative, almost likely to be a G65816

    TODO:
    - understand how to map ROM at 0x800000-0x9fffff / 0xc00000 / 0xdfffff
      banks (granted that we have the ROM for that, of course)

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


#include "emu.h"
#include "cpu/m6502/m6502.h"
//#include "sound/ay8910.h"
#include "cpu/g65816/g65816.h"

#define MAIN_CLOCK XTAL_21_4772MHz

class xavix_state : public driver_device
{
public:
	xavix_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
			m_maincpu(*this, "maincpu")
	{ }

	// devices
	required_device<cpu_device> m_maincpu;

	// screen updates
	UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

protected:
	// driver_device overrides
	virtual void machine_start() override;
	virtual void machine_reset() override;

	virtual void video_start() override;
};

void xavix_state::video_start()
{
}

UINT32 xavix_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	return 0;
}

static ADDRESS_MAP_START( xavix_map, AS_PROGRAM, 8, xavix_state )
	AM_RANGE(0x000000, 0x0001ff) AM_RAM
	AM_RANGE(0x00f000, 0x00ffff) AM_ROM AM_REGION("bios", 0x00f000)
	AM_RANGE(0x800000, 0x9fffff) AM_ROM AM_REGION("bios", 0x000000) // wrong
ADDRESS_MAP_END

static INPUT_PORTS_START( xavix )
	/* dummy active high structure */
	PORT_START("SYSA")
	PORT_DIPNAME( 0x01, 0x00, "SYSA" )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x01, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x02, DEF_STR( On ) )
	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( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x08, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x10, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x80, DEF_STR( On ) )

	/* dummy active low structure */
	PORT_START("DSWA")
	PORT_DIPNAME( 0x01, 0x01, "DSWA" )
	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_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( Unknown ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
INPUT_PORTS_END

/* correct, 4bpp gfxs */
static const gfx_layout charlayout =
{
	8,8,
	RGN_FRAC(1,1),
	4,
	{ STEP4(0,1) },
	{ 1*4,0*4,3*4,2*4,5*4,4*4,7*4,6*4 },
	{ STEP8(0,4*8) },
	8*8*4
};

static GFXDECODE_START( xavix )
	GFXDECODE_ENTRY( "bios", 0, charlayout,     0, 1 )
GFXDECODE_END


void xavix_state::machine_start()
{
}

void xavix_state::machine_reset()
{
}


static MACHINE_CONFIG_START( xavix, xavix_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",G65816,MAIN_CLOCK/4)
	MCFG_CPU_PROGRAM_MAP(xavix_map)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
	MCFG_SCREEN_UPDATE_DRIVER(xavix_state, screen_update)
	MCFG_SCREEN_SIZE(32*8, 32*8)
	MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_GFXDECODE_ADD("gfxdecode", "palette", xavix)

	MCFG_PALETTE_ADD("palette", 16)

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
//  MCFG_SOUND_ADD("aysnd", AY8910, MAIN_CLOCK/4)
//  MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30)
MACHINE_CONFIG_END


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

  Game driver(s)

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

ROM_START( taitons1 )
	ROM_REGION( 0x200000, "bios", ROMREGION_ERASE00 )
	ROM_LOAD( "taitonostalgia1.u3", 0x000000, 0x200000, CRC(25bd8c67) SHA1(a109cd2da6aa4596e3ca3abd1afce2d0001a473f) )
ROM_END

CONS( 2006, taitons1,  0,   0,  xavix,  xavix, driver_device,  0,   "Bandai / SSD Company LTD / Taito",      "Let's! TV Play Classic - Taito Nostalgia 1", MACHINE_IS_SKELETON )
