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path: root/src/mame/drivers/metlfrzr.cpp
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// license:BSD-3-Clause
// copyright-holders:Angelo Salese
// thanks-to: David Haywood, Peter Wilhelmsen
/*************************************************************************************************************************

    Metal Freezer (c) 1989 Seibu

    driver by Angelo Salese, based off initial work by David Haywood
	thanks to Peter Wilhelmsen for the decryption
	
    HW seems the natural evolution of Dark Mist type.

    TODO:
    - A few video register bits still needs sorting out (needs HW tests perhaps?)
    - Nuke legacy video code and re-do it by using tilemap system.
    - sprites are ahead of 1/2 frames, needs sprite DMA fixed;
    - Writes at 0xb800-0xbfff or 0x8000-0x9fff during gameplays? (Check by allowing ROM write)
    - Flip screen support;
    - Why service mode returns all inputs as high? And why sound test doesn't seem to function at all, both BTANBs perhaps?

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

#include "emu.h"
#include "cpu/z80/z80.h"

#include "audio/t5182.h"

class metlfrzr_state : public driver_device
{
public:
	metlfrzr_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_decrypted_opcodes(*this, "decrypted_opcodes"),
		m_work_ram(*this, "wram"),
		m_vram(*this, "vram"),
		m_video_regs(*this, "vregs"),
		m_palette(*this, "palette"),
		m_gfxdecode(*this, "gfxdecode")
		{ }

	virtual void machine_start() override;
	virtual void machine_reset() override;
	virtual void video_start() override;
	void legacy_bg_draw(bitmap_ind16 &bitmap, const rectangle &cliprect);
	void legacy_obj_draw(bitmap_ind16 &bitmap, const rectangle &cliprect);

	UINT32 screen_update_metlfrzr(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
	required_shared_ptr<UINT8> m_decrypted_opcodes;
	required_shared_ptr<UINT8> m_work_ram;
	required_shared_ptr<UINT8> m_vram;
	required_shared_ptr<UINT8> m_video_regs;
	required_device<palette_device> m_palette;
	required_device<gfxdecode_device> m_gfxdecode;

	DECLARE_DRIVER_INIT(metlfrzr);
	DECLARE_WRITE8_MEMBER(output_w);
	TIMER_DEVICE_CALLBACK_MEMBER(scanline);
	UINT8 m_fg_tilebank;
	bool m_rowscroll_enable;
};


void metlfrzr_state::video_start()
{
}

/*
 - video regs format:
    [0x06] ---- --x- used during title screen transition, unknown purpose
    [0x06] ---- ---x X scrolling 8th bit
    [0x15] always 0?
    [0x16] always 0?
    [0x17] xxxx xxxx X scrolling base value
    Notice that it's currently unknown how the game is really supposed to NOT enable scrolling during gameplay.
 */
void metlfrzr_state::legacy_bg_draw(bitmap_ind16 &bitmap,const rectangle &cliprect)
{
	gfx_element *gfx = m_gfxdecode->gfx(m_fg_tilebank);
	const UINT16 vram_mask = m_vram.mask() >> 1;
	int count;
	int x_scroll_base;
	int x_scroll_shift;
	UINT16 x_scroll_value;
	x_scroll_value = m_video_regs[0x17] + ((m_video_regs[0x06] & 1) << 8);
	x_scroll_base = (x_scroll_value >> 3) * 32;

	for (count=0;count<32*33;count++)
	{
		int tile_base = count;
		int y = (count % 32);
		if(y > 7 || m_rowscroll_enable == false)
		{
			tile_base+= x_scroll_base;
			x_scroll_shift = (x_scroll_value & 7);
		}
		else
			x_scroll_shift = 0;
		tile_base &= vram_mask;
		int x = (count / 32);


		UINT16 tile = m_vram[tile_base*2+0] + ((m_vram[tile_base*2+1] & 0xf0) << 4);
		UINT8 color = m_vram[tile_base*2+1] & 0xf;

		gfx->transpen(bitmap,cliprect,tile,color,0,0,x*8-x_scroll_shift,y*8,0xf);
	}

}

/*
 sprite DMA:
    0xfe00-0xffff contains buffer for data to be copied.
    Sprites are currently lagging (noticeable during scrolling) therefore there must be either an automatic or manual trigger.
    Sprite seems to traverse from top to bottom priority-wise, other than that format is almost 1:1 with darkmist.cpp.
 sprite format:
    [0] tttt tttt tile number
    [1] x--- ---- X 8th bit
    [1] -ttt ---- tile bank
    [1] ---- cccc palette number
    [2] yyyy yyyy Y offset
    [3] xxxx xxxx X offset
*/
void metlfrzr_state::legacy_obj_draw(bitmap_ind16 &bitmap,const rectangle &cliprect)
{
	gfx_element *gfx_2 = m_gfxdecode->gfx(2);
	gfx_element *gfx_3 = m_gfxdecode->gfx(3);
	int count;
	UINT8 *base_spriteram = m_work_ram + 0xe00;

	for(count=0x200-4;count>-1;count-=4)
	{

		gfx_element *cur_gfx = base_spriteram[count+1] & 0x40 ? gfx_3 : gfx_2;
		UINT8 tile_bank = (base_spriteram[count+1] & 0x30) >> 4;
		UINT16 tile = base_spriteram[count] | (tile_bank << 8);
		UINT8 color = base_spriteram[count+1] & 0xf;
		int y = base_spriteram[count+2];
		int x = base_spriteram[count+3];
		if(base_spriteram[count+1] & 0x80)
			x-=256;
		
		cur_gfx->transpen(bitmap,cliprect,tile,color,0,0,x,y,0xf);
	}
}

UINT32 metlfrzr_state::screen_update_metlfrzr(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	bitmap.fill(m_palette->black_pen(), cliprect);
	
	legacy_bg_draw(bitmap,cliprect);
	legacy_obj_draw(bitmap,cliprect);
	return 0;
}

WRITE8_MEMBER(metlfrzr_state::output_w)
{
	// bit 7: flip screen
	// bit 6-5: coin lockouts
	// bit 4: tilemap ROM banking
	// bit 3-2: z80 ROM banking
	// bit 1: enabled during gameplay, rowscroll enable?
	// bit 0: enabled , unknown purpose (lamp?)
	// TODO: bits 1-0 might actually be sprite DMA enable mask/request
	machine().bookkeeping().coin_lockout_w(1, BIT(data,6) );
	machine().bookkeeping().coin_lockout_w(0, BIT(data,5) );
	m_fg_tilebank = (data & 0x10) >> 4;
	membank("bank1")->set_entry((data & 0xc) >> 2);
	m_rowscroll_enable = bool(BIT(data,1));
	
//  popmessage("%02x %02x",m_fg_tilebank,data & 3);
}

static ADDRESS_MAP_START( metlfrzr_map, AS_PROGRAM, 8, metlfrzr_state )
	AM_RANGE(0x0000, 0x7fff) AM_ROM
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK("bank1")
	AM_RANGE(0xc000, 0xcfff) AM_RAM AM_SHARE("vram")
	AM_RANGE(0xd000, 0xd1ff) AM_RAM_DEVWRITE("palette", palette_device, write_indirect) AM_SHARE("palette")
	AM_RANGE(0xd200, 0xd3ff) AM_RAM_DEVWRITE("palette", palette_device, write_indirect_ext) AM_SHARE("palette_ext")

	AM_RANGE(0xd400, 0xd47f) AM_DEVREADWRITE("t5182", t5182_device, sharedram_r, sharedram_w)

	AM_RANGE(0xd600, 0xd600) AM_READ_PORT("P1")
	AM_RANGE(0xd601, 0xd601) AM_READ_PORT("P2")
	AM_RANGE(0xd602, 0xd602) AM_READ_PORT("START")
	AM_RANGE(0xd603, 0xd603) AM_READ_PORT("DSW1")
	AM_RANGE(0xd604, 0xd604) AM_READ_PORT("DSW2")
	AM_RANGE(0xd600, 0xd61f) AM_RAM AM_SHARE("vregs") // TODO: write-only, debug

	AM_RANGE(0xd700, 0xd700) AM_WRITE(output_w)
	AM_RANGE(0xd710, 0xd710) AM_DEVWRITE("t5182", t5182_device, sound_irq_w)
	AM_RANGE(0xd711, 0xd711) AM_DEVREAD("t5182", t5182_device, sharedram_semaphore_snd_r)
	// following two do swapped access compared to darkmist
	AM_RANGE(0xd712, 0xd712) AM_DEVWRITE("t5182", t5182_device, sharedram_semaphore_main_release_w)
	AM_RANGE(0xd713, 0xd713) AM_DEVWRITE("t5182", t5182_device, sharedram_semaphore_main_acquire_w)

	AM_RANGE(0xd800, 0xdfff) AM_RAM
	AM_RANGE(0xe000, 0xefff) AM_RAM
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE("wram")
ADDRESS_MAP_END

static ADDRESS_MAP_START( decrypted_opcodes_map, AS_DECRYPTED_OPCODES, 8, metlfrzr_state )
	AM_RANGE(0x0000, 0x7fff) AM_ROM AM_SHARE("decrypted_opcodes")
	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK("bank1")
	AM_RANGE(0xf000, 0xffff) AM_RAM AM_SHARE("wram") // executes code at 0xf5d5
ADDRESS_MAP_END


static INPUT_PORTS_START( metlfrzr )
	PORT_START("P1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("P2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_COCKTAIL
	PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("START")
	PORT_DIPNAME( 0x01, 0x01, "2-0" )
	PORT_DIPSETTING(    0x01, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x02, 0x02, "2-1" )
	PORT_DIPSETTING(    0x02, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x04, 0x04, "2-2" )
	PORT_DIPSETTING(    0x04, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x08, 0x08, "2-2" )
	PORT_DIPSETTING(    0x08, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_START1 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START2 )
	PORT_DIPNAME( 0x40, 0x40, "2-6" )
	PORT_DIPSETTING(    0x40, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x80, 0x80, "2-7" )
	PORT_DIPSETTING(    0x80, DEF_STR( No ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )

	PORT_START("DSW1")
	PORT_DIPNAME( 0x01, 0x00, DEF_STR( Cabinet ) )  PORT_DIPLOCATION("SW1:1") 
	PORT_DIPSETTING(    0x00, DEF_STR( Upright ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Cocktail ) )
	PORT_SERVICE_DIPLOC( 0x02, IP_ACTIVE_LOW, "SW1:2" )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Flip_Screen ) ) PORT_DIPLOCATION("SW1:3")
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_A ) )  PORT_DIPLOCATION("SW1:4,5,6") 
	PORT_DIPSETTING(    0x00, DEF_STR( 5C_1C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 4C_1C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x38, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x18, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x28, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 1C_5C ) )
	PORT_DIPNAME( 0xc0, 0xc0, DEF_STR( Coin_B ) ) PORT_DIPLOCATION("SW1:7,8") 
	PORT_DIPSETTING(    0x80, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 2C_3C ) )
	PORT_DIPSETTING(    0xc0, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x40, DEF_STR( 1C_2C ) )

	PORT_START("DSW2")
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW2:1,2") 
	PORT_DIPSETTING(    0x02, "A" )
	PORT_DIPSETTING(    0x03, "B" )
	PORT_DIPSETTING(    0x01, "C" )
	PORT_DIPSETTING(    0x00, "D" )
	// service mode returns these values divided by 10 (so 02/05/10 effectively means 20k, 50k, 100k)
	// TODO: check if it extends
	PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Bonus_Life ) ) PORT_DIPLOCATION("SW2:3,4") 
	PORT_DIPSETTING(    0x08, "20k, 50k, 100k" )
	PORT_DIPSETTING(    0x0c, "30k, 80k, 150k" )
	PORT_DIPSETTING(    0x04, "50k, 100k, 200k" )
	PORT_DIPSETTING(    0x00, "100k, 200k, 400k" )
	PORT_DIPNAME( 0x30, 0x30, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW2:5,6") 
	PORT_DIPSETTING(    0x20, "1" )
	PORT_DIPSETTING(    0x10, "2" )
	PORT_DIPSETTING(    0x30, "3" )
	PORT_DIPSETTING(    0x00, "4" )
	// disabling following enables intro / how to play screens
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Level_Select ) )  PORT_DIPLOCATION("SW2:7") 
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Demo_Sounds ) )  PORT_DIPLOCATION("SW2:8") 
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
INPUT_PORTS_END



void metlfrzr_state::machine_start()
{
	membank("bank1")->configure_entries(0, 4, memregion("maincpu")->base() + 0x10000, 0x4000);
}

void metlfrzr_state::machine_reset()
{
	membank("bank1")->set_entry(0);

}


static const gfx_layout tile_layout =
{
	8,8,
	RGN_FRAC(1,1),
	4,
	{ STEP4(0,4) },
	{ STEP4_INV(16,1), STEP4_INV(0,1) },
	{ STEP8(0,32) },
	32*8
};

static const gfx_layout sprite_layout =
{
	16, 16,
	RGN_FRAC(1, 1),
	4,
	{ STEP4(0,4) },
	{ STEP4(0,1), STEP4(16,1), STEP4(64*8,1), STEP4(64*8+16,1) },
	{ STEP16(0,32) },
	128 * 8
};


static GFXDECODE_START(metlfrzr)
	GFXDECODE_ENTRY("gfx1", 0, tile_layout, 0x100, 16)
	GFXDECODE_ENTRY("gfx2", 0, tile_layout, 0x100, 16)
	GFXDECODE_ENTRY("gfx3", 0, sprite_layout, 0, 16)
	GFXDECODE_ENTRY("gfx4", 0, sprite_layout, 0, 16)
GFXDECODE_END

TIMER_DEVICE_CALLBACK_MEMBER(metlfrzr_state::scanline)
{
	int scanline = param;

	if(scanline == 240) // vblank-out irq
		m_maincpu->set_input_line_and_vector(0, HOLD_LINE,0x10); /* RST 10h */

	// TODO: check this irq.
	if(scanline == 0) // vblank-in irq
		m_maincpu->set_input_line_and_vector(0, HOLD_LINE,0x08); /* RST 08h */
}

static MACHINE_CONFIG_START(metlfrzr, metlfrzr_state)

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL_12MHz / 2)
	MCFG_CPU_PROGRAM_MAP(metlfrzr_map)
	MCFG_CPU_DECRYPTED_OPCODES_MAP(decrypted_opcodes_map)
	MCFG_TIMER_DRIVER_ADD_SCANLINE("scantimer", metlfrzr_state, scanline, "screen", 0, 1)

	MCFG_DEVICE_ADD("t5182", T5182, 0)

	MCFG_PALETTE_ADD("palette", 0x200)
	MCFG_PALETTE_INDIRECT_ENTRIES(256*2)
	MCFG_PALETTE_FORMAT(xxxxBBBBGGGGRRRR)

	MCFG_GFXDECODE_ADD("gfxdecode", "palette", metlfrzr)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MCFG_SCREEN_SIZE(256, 256)
	MCFG_SCREEN_VISIBLE_AREA(0, 256 - 1, 16, 256 - 16 - 1)
	MCFG_SCREEN_UPDATE_DRIVER(metlfrzr_state, screen_update_metlfrzr)
	MCFG_SCREEN_PALETTE("palette")

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

	MCFG_YM2151_ADD("ymsnd", XTAL_14_31818MHz / 4)    /* 3.579545 MHz */
	MCFG_YM2151_IRQ_HANDLER(DEVWRITELINE("t5182", t5182_device, ym2151_irq_handler))
	MCFG_SOUND_ROUTE(0, "mono", 1.0)
	MCFG_SOUND_ROUTE(1, "mono", 1.0)

MACHINE_CONFIG_END



ROM_START(metlfrzr)
	ROM_REGION(0x20000, "maincpu", 0)
	ROM_LOAD("1.15j", 0x00000, 0x08000, CRC(f59b5fa2) SHA1(6033967dad5e64f45afbcb1b45c8eb79e0787afb))
	ROM_LOAD("2.14j", 0x10000, 0x10000, CRC(21ecc248) SHA1(2fccf7db73890faf7c489bfc43c88ded54d5052d))

	ROM_REGION(0x8000, "t5182_z80", 0) /* Toshiba T5182 external data ROM */
	ROM_LOAD("3.4h", 0x0000, 0x8000, CRC(36f88e54) SHA1(5cbea56c7e547c353ae2f9256caaceb20e5e8503))

	ROM_REGION(0x20000, "gfx1", 0)
	ROM_LOAD16_BYTE("10.5a", 0x00001, 0x10000, CRC(3313e74a) SHA1(8622dfb5c013173d5bb037254f4c23b1282404e1))
	ROM_LOAD16_BYTE("12.7a", 0x00000, 0x10000, CRC(6da5fda9) SHA1(9d7b0b26598f31da589fece3535a4d1405b03fc2))

	ROM_REGION(0x20000, "gfx2", 0)
	ROM_LOAD16_BYTE("11.6a", 0x00001, 0x10000, CRC(fa6490b8) SHA1(9a4c1e09b9e8fb256fec0a5ed120fece8a12e1c8))
	ROM_LOAD16_BYTE("13.9a", 0x00000, 0x10000, CRC(a4f689ec) SHA1(e58bfede3fabf4cfca76c20aafb3e9fb604777c9))

	ROM_REGION(0x20000, "gfx3", 0)
	ROM_LOAD16_BYTE("14.13a", 0x00001, 0x10000, CRC(a9cd5225) SHA1(f3d5e29ee08fb563fdc1af3c64128f2cd2feb987))
	ROM_LOAD16_BYTE("16.11a", 0x00000, 0x10000, CRC(92f2cb49) SHA1(498021d94b0fde216207076491702af2324a2dcc))

	ROM_REGION(0x20000, "gfx4", 0)
	ROM_LOAD16_BYTE("15.12a", 0x00001, 0x10000, CRC(ce5c4c8b) SHA1(2351d66ba51e80097ce53bfd448ac24901844cda))
	ROM_LOAD16_BYTE("17.10a", 0x00000, 0x10000, CRC(3fec33f7) SHA1(af086ba30fc4521a0114da2824f5baa04d225a89))

	ROM_REGION(0x20000, "proms", 0)
	ROM_LOAD("n8s129a.7f",  0x000, 0x100, CRC(c849d60b) SHA1(0022fb71b3d777cadac7005e6156725df9bcaf90))
	ROM_LOAD("n82s135n.9c", 0x000, 0x100, CRC(7bbd52db) SHA1(b9bab5fb515579d0270aea8b992a16eeb878f242))

	ROM_REGION(0x20000, "plds", 0)
	ROM_LOAD("pld3.14h.bin", 0x000, 0x149, CRC(8183f7f0) SHA1(3cec53838120064374ecf4ebee048409c6f34081))
	ROM_LOAD("pld8.4d.bin",  0x000, 0x149, CRC(f1e35034) SHA1(527faddbf2ac905fa59ebda8ea327e6e6a7c1fb6))
ROM_END



DRIVER_INIT_MEMBER(metlfrzr_state, metlfrzr)
{
	// same as cshooter.cpp
	UINT8 *rom = memregion("maincpu")->base();

	for (int A = 0x0000;A < 0x8000;A++)
	{
		/* decode the opcodes */
		m_decrypted_opcodes[A] = rom[A];

		if (BIT(A,5) && !BIT(A,3))
			m_decrypted_opcodes[A] ^= 0x40;

		if (BIT(A,10) && !BIT(A,9) && BIT(A,3))
			m_decrypted_opcodes[A] ^= 0x20;

		if ((BIT(A,10) ^ BIT(A,9)) && BIT(A,1))
			m_decrypted_opcodes[A] ^= 0x02;

		if (BIT(A,9) || !BIT(A,5) || BIT(A,3))
			m_decrypted_opcodes[A] = BITSWAP8(m_decrypted_opcodes[A],7,6,1,4,3,2,5,0);

		/* decode the data */
		if (BIT(A,5))
			rom[A] ^= 0x40;

		if (BIT(A,9) || !BIT(A,5))
			rom[A] = BITSWAP8(rom[A],7,6,1,4,3,2,5,0);
	}
}



GAME( 1989, metlfrzr,  0,    metlfrzr, metlfrzr, metlfrzr_state,  metlfrzr, ROT270, "Seibu Kaihatsu", "Metal Freezer (Japan)", MACHINE_NO_COCKTAIL )