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path: root/src/mame/drivers/tugboat.cpp
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// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/****************************************************************************

Tug Boat
6502 hooked up + preliminary video by Ryan Holtz

TODO:
- verify connections of the two PIAs. I only hooked up a couple of ports but
  there are more.
- check how the score is displayed. I'm quite sure that tugboat_score_w is
  supposed to access videoram scanning it by columns (like btime_mirrorvideoram_w),
  but the current implementation is a big kludge, and it still looks wrong.
- colors might not be entirely accurate
  Suspect berenstn is using the wrong color PROM.
- convert to use the H46505 device.

the problem which caused the controls not to work
---
There's counter at $000b, counting up from $ff to 0 or from $fe to 0 (initial value depends
on game level). It's increased in main loop, and used for game flow control (scrolling speed , controls  etc).
Every interrupt, when (counter&3)!=0 , there's a check for left/right inputs .
But when init val was $ff (2nd level),  the condition 'counter&3!=0' was
always false - counter was reloaded and incremented before interrupt occurs

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

#include "emu.h"
#include "cpu/m6502/m6502.h"
#include "machine/6821pia.h"
#include "sound/ay8910.h"
#include "emupal.h"
#include "screen.h"
#include "speaker.h"


class tugboat_state : public driver_device
{
public:
	tugboat_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_gfxdecode(*this, "gfxdecode"),
		m_screen(*this, "screen"),
		m_palette(*this, "palette"),
		m_ram(*this, "ram")
	{ }

	void tugboat(machine_config &config);

protected:
	enum
	{
		TIMER_INTERRUPT
	};

	virtual void machine_start() override;
	virtual void video_start() override;
	virtual void machine_reset() override;

	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;

private:
	required_device<cpu_device> m_maincpu;
	required_device<gfxdecode_device> m_gfxdecode;
	required_device<screen_device> m_screen;
	required_device<palette_device> m_palette;

	required_shared_ptr<uint8_t> m_ram;

	uint8_t m_hd46505_0_reg[18];
	uint8_t m_hd46505_1_reg[18];
	int m_reg0;
	int m_reg1;
	int m_ctrl;
	emu_timer *m_interrupt_timer;

	void hd46505_0_w(offs_t offset, uint8_t data);
	void hd46505_1_w(offs_t offset, uint8_t data);
	void score_w(offs_t offset, uint8_t data);
	uint8_t input_r();
	void ctrl_w(uint8_t data);

	void tugboat_palette(palette_device &palette) const;

	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	void draw_tilemap(bitmap_ind16 &bitmap, const rectangle &cliprect, int addr, int gfx0, int gfx1, int transparency);

	void main_map(address_map &map);
};


void tugboat_state::machine_start()
{
	m_interrupt_timer = timer_alloc(TIMER_INTERRUPT);

	save_item(NAME(m_hd46505_0_reg));
	save_item(NAME(m_hd46505_1_reg));
	save_item(NAME(m_reg0));
	save_item(NAME(m_reg1));
	save_item(NAME(m_ctrl));
}

void tugboat_state::video_start()
{
	m_gfxdecode->gfx(0)->set_granularity(8);
	m_gfxdecode->gfx(2)->set_granularity(8);
}

//  there isn't the usual resistor array anywhere near the color PROM, just four 1k resistors.
void tugboat_state::tugboat_palette(palette_device &palette) const
{
	uint8_t const *const color_prom = memregion("proms")->base();
	for (int i = 0; i < palette.entries(); i++)
	{
		int const brt = BIT(color_prom[i], 3) ? 0xff : 0x80;

		int const r = brt * BIT(color_prom[i], 0);
		int const g = brt * BIT(color_prom[i], 1);
		int const b = brt * BIT(color_prom[i], 2);

		palette.set_pen_color(i, rgb_t(r, g, b));
	}
}



/* see mc6845.cpp. That file is only a placeholder, I process the writes here
   because I need the start_addr register to handle scrolling */
void tugboat_state::hd46505_0_w(offs_t offset, uint8_t data)
{
	if (offset == 0) m_reg0 = data & 0x0f;
	else if (m_reg0 < 18) m_hd46505_0_reg[m_reg0] = data;
}
void tugboat_state::hd46505_1_w(offs_t offset, uint8_t data)
{
	if (offset == 0) m_reg1 = data & 0x0f;
	else if (m_reg1 < 18) m_hd46505_1_reg[m_reg1] = data;
}


void tugboat_state::score_w(offs_t offset, uint8_t data)
{
		if (offset>=0x8) m_ram[0x291d + 32*offset + 32*(1-8)] = data ^ 0x0f;
		if (offset<0x8 ) m_ram[0x291d + 32*offset + 32*9] = data ^ 0x0f;
}

void tugboat_state::draw_tilemap(bitmap_ind16 &bitmap, const rectangle &cliprect,
		int addr, int gfx0, int gfx1, int transparency)
{
	for (int y = 0; y < 32; y++)
	{
		for (int x = 0; x < 32; x++)
		{
			int attr = m_ram[addr + 0x400];
			int code = ((attr & 0x01) << 8) | m_ram[addr];
			int color = (attr & 0x3c) >> 2;

			int rgn, transpen;
			if (attr & 0x02)
			{
				rgn = gfx1;
				transpen = 7;
			}
			else
			{
				rgn = gfx0;
				transpen = 1;
			}

			m_gfxdecode->gfx(rgn)->transpen(bitmap,cliprect,
					code,
					color,
					0,0,
					8*x,8*y,
					transparency ? transpen : -1);

			addr = (addr & 0xfc00) | ((addr + 1) & 0x03ff);
		}
	}
}

uint32_t tugboat_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int const startaddr0 = m_hd46505_0_reg[0x0c]*256 + m_hd46505_0_reg[0x0d];
	int const startaddr1 = m_hd46505_1_reg[0x0c]*256 + m_hd46505_1_reg[0x0d];

	draw_tilemap(bitmap, cliprect, startaddr0, 0, 1, false);
	draw_tilemap(bitmap, cliprect, startaddr1, 2, 3, true);

	return 0;
}



uint8_t tugboat_state::input_r()
{
	if (~m_ctrl & 0x80)
		return ioport("IN0")->read();
	else if (~m_ctrl & 0x40)
		return ioport("IN1")->read();
	else if (~m_ctrl & 0x20)
		return ioport("IN2")->read();
	else if (~m_ctrl & 0x10)
		return ioport("IN3")->read();
	else
		return ioport("IN4")->read();
}

void tugboat_state::ctrl_w(uint8_t data)
{
	m_ctrl = data;
}

void tugboat_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch (id)
	{
	case TIMER_INTERRUPT:
		m_maincpu->set_input_line(0, HOLD_LINE);
		m_interrupt_timer->adjust(m_screen->frame_period());
		break;
	default:
		throw emu_fatalerror("Unknown id in tugboat_state::device_timer");
	}
}

void tugboat_state::machine_reset()
{
	m_interrupt_timer->adjust(m_screen->time_until_pos(0));
}


void tugboat_state::main_map(address_map &map)
{
	map.global_mask(0x7fff);
	map(0x0000, 0x01ff).ram().share("ram");
	map(0x1060, 0x1061).w("aysnd", FUNC(ay8910_device::address_data_w));
	map(0x10a0, 0x10a1).w(FUNC(tugboat_state::hd46505_0_w));  /* scrolling is performed changing the start_addr register (0C/0D) */
	map(0x10c0, 0x10c1).w(FUNC(tugboat_state::hd46505_1_w));
	map(0x11e4, 0x11e7).rw("pia0", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
	map(0x11e8, 0x11eb).rw("pia1", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
	//map(0x1700, 0x1fff).ram();
	map(0x18e0, 0x18ef).w(FUNC(tugboat_state::score_w));
	map(0x2000, 0x2fff).ram(); /* tilemap RAM */
	map(0x4000, 0x7fff).rom();
}


static INPUT_PORTS_START( tugboat )
	PORT_START("IN0")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("IN1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_2WAY
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_2WAY
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("IN2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("IN3")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 ) PORT_IMPULSE(1)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("IN4")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("DSW")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_DIPNAME( 0x30, 0x10, DEF_STR( Coinage ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_4C ) )
	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "3" )
	PORT_DIPSETTING(    0x40, "5" )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
INPUT_PORTS_END

static INPUT_PORTS_START( noahsark )
	PORT_INCLUDE( tugboat )

	PORT_MODIFY("IN1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
INPUT_PORTS_END


static const gfx_layout charlayout =
{
	8,8,
	RGN_FRAC(1,1),
	1,
	{ 0 },
	{ 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
};

static const gfx_layout tilelayout =
{
	8,8,
	RGN_FRAC(1,3),
	3,
	{ RGN_FRAC(2,3), RGN_FRAC(1,3), RGN_FRAC(0,3) },
	{ 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
};

static GFXDECODE_START( gfx_tugboat )
	GFXDECODE_ENTRY( "gfx1", 0, charlayout, 0x80, 16 )
	GFXDECODE_ENTRY( "gfx2", 0, tilelayout, 0x80, 16 )
	GFXDECODE_ENTRY( "gfx3", 0, charlayout, 0x00, 16 )
	GFXDECODE_ENTRY( "gfx4", 0, tilelayout, 0x00, 16 )
GFXDECODE_END


void tugboat_state::tugboat(machine_config &config)
{
	M6502(config, m_maincpu, 2000000); /* 2 MHz ???? */
	m_maincpu->set_addrmap(AS_PROGRAM, &tugboat_state::main_map);

	pia6821_device &pia0(PIA6821(config, "pia0", 0));
	pia0.readpa_handler().set(FUNC(tugboat_state::input_r));

	pia6821_device &pia1(PIA6821(config, "pia1", 0));
	pia1.readpa_handler().set_ioport("DSW");
	pia1.writepb_handler().set(FUNC(tugboat_state::ctrl_w));

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_refresh_hz(60);
	m_screen->set_size(32*8,32*8);
	m_screen->set_visarea(1*8,31*8-1,2*8,30*8-1);
	m_screen->set_screen_update(FUNC(tugboat_state::screen_update));
	m_screen->set_palette(m_palette);
	m_screen->screen_vblank().set_inputline(m_maincpu, INPUT_LINE_NMI);

	GFXDECODE(config, m_gfxdecode, m_palette, gfx_tugboat);
	PALETTE(config, m_palette, FUNC(tugboat_state::tugboat_palette), 256);

	/* sound hardware */
	SPEAKER(config, "mono").front_center();

	AY8912(config, "aysnd", XTAL(10'000'000)/8).add_route(ALL_OUTPUTS, "mono", 0.35);
}


ROM_START( tugboat )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "u7.bin", 0x5000, 0x1000, CRC(e81d7581) SHA1(c76327e3b027a5a2af69f8cfafa1f828ad0ebdb1) )
	ROM_LOAD( "u8.bin", 0x6000, 0x1000, CRC(7525de06) SHA1(0722c7a0b89c55162227173679ffbe398ca350a2) )
	ROM_LOAD( "u9.bin", 0x7000, 0x1000, CRC(aa4ae687) SHA1(a212eed5d04d6197aa3484ff36059fd7998604a6) )

	ROM_REGION( 0x0800, "gfx1", ROMREGION_INVERT  )
	ROM_LOAD( "u67.bin",  0x0000, 0x0800, CRC(601c425b) SHA1(13ed54ba1307ba3f779293d88c19d0c0f2d91a96) )

	ROM_REGION( 0x3000, "gfx2", ROMREGION_INVERT  )
	ROM_LOAD( "u68.bin", 0x0000, 0x1000, CRC(d5835182) SHA1(f67c8f93e0d7dd1bf8e3a98756719d386c133d1c) )
	ROM_LOAD( "u69.bin", 0x1000, 0x1000, CRC(e6d25878) SHA1(de9096ef3108d031049be1e7f2c5e346d0bc0df1) )
	ROM_LOAD( "u70.bin", 0x2000, 0x1000, CRC(34ce2850) SHA1(8883126627ed8a1d2c3bed2a3d169ce35eafc8a3) )

	ROM_REGION( 0x0800, "gfx3", 0 )
	ROM_LOAD( "u168.bin", 0x0000, 0x0800, CRC(279042fd) SHA1(1361fff1bc532251bbd36b7b60776c2cc137cfba) )    /* labeled u-167 */

	ROM_REGION( 0x1800, "gfx4", 0 )
	ROM_LOAD( "u170.bin", 0x0000, 0x0800, CRC(64d9f4d7) SHA1(3ff7fc099023512c33ec4583e91e6cbab903e7a8) )    /* labeled u-168 */
	ROM_LOAD( "u169.bin", 0x0800, 0x0800, CRC(1a636296) SHA1(bcb18d714328ba3db2d16d74c47a985c16a0bbe2) )    /* labeled u-169 */
	ROM_LOAD( "u167.bin", 0x1000, 0x0800, CRC(b9c9b4f7) SHA1(6685d580ae150d7c67bac2786ee4b7a2c28eddc3) )    /* labeled u-170 */

	ROM_REGION( 0x0100, "proms", 0 )
	ROM_LOAD( "nt2_u128.clr", 0x0000, 0x0100, CRC(236672bf) SHA1(57482d0a23223ef7b211045ad28d3e41e90f961e) )
ROM_END


ROM_START( noahsark )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "u6.bin", 0x4000, 0x1000, CRC(3579eeac) SHA1(f54435ac6b31cf81342de83965cf8a8503b26eb8) )
	ROM_LOAD( "u7.bin", 0x5000, 0x1000, CRC(64b0afae) SHA1(1fcc17490d1290565be38a817f783604bcefb8be) )
	ROM_LOAD( "u8.bin", 0x6000, 0x1000, CRC(02d53f62) SHA1(e51a583a548b4bdaf43d376d5d276325ee448d49) )
	ROM_LOAD( "u9.bin", 0x7000, 0x1000, CRC(d425b61c) SHA1(a8d9562435cc910916df4cd7e958468d88ff92e7) )

	ROM_REGION( 0x0800, "gfx1", ROMREGION_INVERT  )
	ROM_LOAD( "u67.bin",  0x0000, 0x0800, CRC(1a77605b) SHA1(8c25750f94895f5820ad4f1fa4ae1ea70ee0aee2) )

	ROM_REGION( 0x3000, "gfx2", ROMREGION_INVERT  )
	ROM_LOAD( "u68.bin", 0x0000, 0x1000, CRC(6a66eac8) SHA1(3a13c2f5ef45cdd8b8b5db07d8c1417a3304723a) )
	ROM_LOAD( "u69.bin", 0x1000, 0x1000, CRC(fa2c279c) SHA1(332fcfcfe605c4132114399c32932507b16752e5) )
	ROM_LOAD( "u70.bin", 0x2000, 0x1000, CRC(dcabc7c5) SHA1(68abfdedea518e3a5c90f9f72173e8c05e190535) )

	ROM_REGION( 0x0800, "gfx3", 0 )
	ROM_LOAD( "u168.bin", 0x0000, 0x0800, CRC(7fc7280f) SHA1(93bf46e421b580edf81177db85cb220073761c57) )    /* labeled u-167 */

	ROM_REGION( 0x3000, "gfx4", 0 )
	ROM_LOAD( "u170.bin", 0x0000, 0x1000, CRC(ba36641c) SHA1(df206dc4b6f2da7b60bdaa72c8175de928a630a4) )    /* labeled u-168 */
	ROM_LOAD( "u169.bin", 0x1000, 0x1000, CRC(68c58207) SHA1(e09f9f8b5f1071fbf8a4883f75f296ec4bc0eca1) )    /* labeled u-169 */
	ROM_LOAD( "u167.bin", 0x2000, 0x1000, CRC(76f16c5b) SHA1(a8a8f0ad7dcc57c2bf518fc5e2509ed8fb87f403) )    /* labeled u-170 */

	ROM_REGION( 0x0100, "proms", 0 )
	ROM_LOAD( "u128.bin", 0x0000, 0x0100, CRC(816784bd) SHA1(47181f4a6ab35c46796ca1d8c130b76f404c188d) )
ROM_END


ROM_START( berenstn )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "u6.bin", 0x4000, 0x1000, CRC(e45275a2) SHA1(d788bc5a69b3cdb2596a3b354371ff88d39f6d46) )
	ROM_LOAD( "u7.bin", 0x5000, 0x1000, CRC(1984d787) SHA1(c13959c9be075400e9d1668b5404bc73f6db5fe4) )
	ROM_LOAD( "u8.bin", 0x6000, 0x1000, CRC(0c4d53b7) SHA1(45bd847fdb7bbfbe53d750003024ef3454faa6e6) )
	ROM_LOAD( "u9.bin", 0x7000, 0x1000, CRC(7e058e57) SHA1(e9506fa4ec693abf0dc4e4cbfd4b93bdbcfc9ba4) )

	ROM_REGION( 0x0800, "gfx1", ROMREGION_INVERT  )
	ROM_LOAD( "u67.bin",  0x0000, 0x0800, CRC(1a77605b) SHA1(8c25750f94895f5820ad4f1fa4ae1ea70ee0aee2) )

	ROM_REGION( 0x3000, "gfx2", ROMREGION_INVERT  )
	ROM_LOAD( "u68.bin", 0x0000, 0x1000, CRC(21bf375f) SHA1(52bc81a4f289a96edfab034445bcf639b1524ada) )
	ROM_LOAD( "u69.bin", 0x1000, 0x1000, CRC(9dc770f6) SHA1(5dc16fac72d68b521dbb415935f5e7f682c26d7f) )
	ROM_LOAD( "u70.bin", 0x2000, 0x1000, CRC(a810bd45) SHA1(8be531529174c5d4b4f164bd2397116b9d5350db) )

	ROM_REGION( 0x0800, "gfx3", 0 )
	ROM_LOAD( "u167.bin", 0x0000, 0x0800, CRC(7fc7280f) SHA1(93bf46e421b580edf81177db85cb220073761c57) )

	ROM_REGION( 0x3000, "gfx4", 0 )
	ROM_LOAD( "u168.bin", 0x0000, 0x0800, CRC(af532ba3) SHA1(b196e294eaf4c25549278fd040b1dad2799e18d5) )
	ROM_LOAD( "u169.bin", 0x1000, 0x0800, CRC(07b6e660) SHA1(c755f63cc7c566e200fc11199bfac06a7e8f89e4) )
	ROM_LOAD( "u170.bin", 0x2000, 0x0800, CRC(73261eff) SHA1(19edd6957fceb3df12fd29cd5e156a5eb1c70710) )

	ROM_REGION( 0x0100, "proms", 0 ) /* Same as Tugboat but is this actually correct? */
	ROM_LOAD( "n.t.2-031j.24s10", 0x0000, 0x0100, CRC(236672bf) SHA1(57482d0a23223ef7b211045ad28d3e41e90f961e) )
ROM_END


GAME( 1982, tugboat,  0, tugboat, tugboat,  tugboat_state, empty_init, ROT90, "Enter-Tech, Ltd.", "Tugboat",                                MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
GAME( 1983, noahsark, 0, tugboat, noahsark, tugboat_state, empty_init, ROT90, "Enter-Tech, Ltd.", "Noah's Ark",                             MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
GAME( 1984, berenstn, 0, tugboat, noahsark, tugboat_state, empty_init, ROT90, "Enter-Tech, Ltd.", "The Berenstain Bears in Big Paw's Cave", MACHINE_IMPERFECT_GRAPHICS | MACHINE_WRONG_COLORS | MACHINE_SUPPORTS_SAVE )