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path: root/src/mame/drivers/toratora.cpp
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// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
/***************************************************************************

Tora Tora (c) 1980 Game Plan

driver by Nicola Salmoria, qwijibo

deviations from schematics verified on set 2 pcb:

  main pcb:
    - U33.3 connected to /IRQ line via inverter U67.9,
      providing timer IRQ for input polling.

    - U43 removed from timer circuit, U52.9 wired directly to
      U32.5, increasing timer frequency to 250 Hz.

  audio pcb:
    - U6.10 wired to U14.21, cut from R14/16
    - R16 wired to R1 in series, R1 cut from GND
    - R14 wired to GND instead of U6.10

    - U5.10 wired to U15.21, cut from R13/15
    - R15 wired to R2 in series, R2 cut from GND
    - R13 wired to GND instead of U5.10

    - EXT VCO DACs (U11, U12) and surrounding logic not placed
    - Numerous changes to SN74677 timing component R & C values

TODO:
- The game reads some unmapped memory addresses, missing ROMs? There's an empty
  socket for U3 on the board, which should map at 5000-57ff, however the
  game reads mostly from 4800-4fff, which would be U6 according to the
  schematics.

- The manual mentions dip switch settings and the schematics show the switches,
  the game reads them but ignores them, forcing 1C/1C and 3 lives.
  Maybe the dump is from a proto?
  Set 2 dump does read dip switches, so likely not a proto.

- Bullet and explosion audio frequencies seem incorrect

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

#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "machine/6821pia.h"
#include "sound/sn76477.h"


class toratora_state : public driver_device
{
public:
	toratora_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_videoram(*this, "videoram"),
		m_maincpu(*this, "maincpu"),
		m_sn1(*this, "sn1"),
		m_sn2(*this, "sn2"),
		m_pia_u1(*this, "pia_u1"),
		m_pia_u2(*this, "pia_u2"),
		m_pia_u3(*this, "pia_u3") { }

	/* memory pointers */
	required_shared_ptr<uint8_t> m_videoram;

	/* video-related */
	int        m_timer;
	uint8_t      m_clear_tv;

	/* devices */
	required_device<cpu_device> m_maincpu;
	required_device<sn76477_device> m_sn1;
	required_device<sn76477_device> m_sn2;
	required_device<pia6821_device> m_pia_u1;
	required_device<pia6821_device> m_pia_u2;
	required_device<pia6821_device> m_pia_u3;
	DECLARE_WRITE8_MEMBER(clear_tv_w);
	DECLARE_READ8_MEMBER(timer_r);
	DECLARE_WRITE8_MEMBER(clear_timer_w);
	DECLARE_WRITE_LINE_MEMBER(cb2_u2_w);
	DECLARE_WRITE8_MEMBER(port_b_u1_w);
	DECLARE_WRITE_LINE_MEMBER(main_cpu_irq);
	DECLARE_WRITE8_MEMBER(sn1_port_a_u3_w);
	DECLARE_WRITE8_MEMBER(sn1_port_b_u3_w);
	DECLARE_WRITE_LINE_MEMBER(sn1_ca2_u3_w);
	DECLARE_WRITE8_MEMBER(sn2_port_a_u2_w);
	DECLARE_WRITE8_MEMBER(sn2_port_b_u2_w);
	DECLARE_WRITE_LINE_MEMBER(sn2_ca2_u2_w);
	virtual void machine_start() override;
	virtual void machine_reset() override;
	uint32_t screen_update_toratora(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
	INTERRUPT_GEN_MEMBER(toratora_timer);
};



/*************************************
 *
 *  Input handling
 *
 *************************************/

WRITE_LINE_MEMBER(toratora_state::cb2_u2_w)
{
	logerror("DIP tristate %sactive\n",(state & 1) ? "in" : "");
}


/*************************************
 *
 *  Video hardware
 *
 *************************************/

uint32_t toratora_state::screen_update_toratora(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	offs_t offs;

	for (offs = 0; offs < m_videoram.bytes(); offs++)
	{
		int i;

		uint8_t y = offs >> 5;
		uint8_t x = offs << 3;
		uint8_t data = m_videoram[offs];

		for (i = 0; i < 8; i++)
		{
			pen_t pen = (data & 0x80) ? rgb_t::white : rgb_t::black;
			bitmap.pix32(y, x) = pen;

			data = data << 1;
			x = x + 1;
		}

		/* the video system clears as it writes out the pixels */
		if (m_clear_tv)
			m_videoram[offs] = 0;
	}

	m_clear_tv = 0;

	return 0;
}


WRITE8_MEMBER(toratora_state::clear_tv_w)
{
	m_clear_tv = 1;
}


/*************************************
 *
 *  Coin counter
 *
 *************************************/

WRITE8_MEMBER(toratora_state::port_b_u1_w)
{
	if (m_pia_u1->port_b_z_mask() & 0x20)
		machine().bookkeeping().coin_counter_w(0, 1);
	else
		machine().bookkeeping().coin_counter_w(0, data & 0x20);
}


/*************************************
 *
 *  Interrupt generation
 *
 *************************************/

WRITE_LINE_MEMBER(toratora_state::main_cpu_irq)
{
	int combined_state = m_pia_u1->irq_a_state() | m_pia_u1->irq_b_state();

	logerror("GEN IRQ: %x\n", combined_state);
	m_maincpu->set_input_line(0, combined_state ? ASSERT_LINE : CLEAR_LINE);
}


INTERRUPT_GEN_MEMBER(toratora_state::toratora_timer)
{
	/* timer counting at 250 Hz. (500 Hz / 2 via U52.9).
	 * U43 removed from circuit, U52.9 wired to U32.5) */
	m_timer++;

	/* U33 bit 0 routed to /IRQ line after inverting through U67.9 */
	if(m_timer & 0x10)
		m_maincpu->set_input_line(0, ASSERT_LINE);

	/* also, when the timer overflows (16 seconds) watchdog would kick in */
	if (m_timer & 0x100)
		popmessage("watchdog!");

	m_pia_u1->porta_w(ioport("INPUT")->read() & 0x0f);
	m_pia_u1->ca1_w(ioport("INPUT")->read() & 0x10);
	m_pia_u1->ca2_w(ioport("INPUT")->read() & 0x20);
}

READ8_MEMBER(toratora_state::timer_r)
{
	return m_timer;
}

WRITE8_MEMBER(toratora_state::clear_timer_w)
{
	m_timer = 0;
	m_maincpu->set_input_line(0, CLEAR_LINE);
}


/*************************************
 *
 *  Audio hardware
 *
 *************************************/


WRITE8_MEMBER(toratora_state::sn1_port_a_u3_w)
{
	m_sn1->vco_voltage_w(2.35 * (data & 0x7f) / 128.0);
	m_sn1->enable_w((data >> 7) & 0x01);
}


WRITE8_MEMBER(toratora_state::sn1_port_b_u3_w)
{
	static const double resistances[] =
	{
		RES_INF, /* N/C */
		RES_INF, /* R39 not placed */
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51) + RES_K(100) + RES_K(240),
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51) + RES_K(100),
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51),
		RES_K(10) + RES_K(10) + RES_K(24),
		RES_K(10) + RES_K(10),
		RES_INF
	};

	m_sn1->mixer_a_w      ((data >> 0) & 0x01);
	m_sn1->mixer_b_w      ((data >> 1) & 0x01);
	m_sn1->mixer_c_w      ((data >> 2) & 0x01);
	m_sn1->envelope_1_w   ((data >> 3) & 0x01);
	m_sn1->envelope_2_w   ((data >> 4) & 0x01);
	m_sn1->slf_res_w(resistances[(data >> 5)]);

	/*
	 * TODO: Determine proper 7441 output voltage here.
	 * Datasheet lists 2.5 V max under worst conditions,
	 * probably much lower in reality?
	 * However, shot audio is muted if V < 1.0, as mixer state
	 * is set to SLF & VCO. Should SLF FF state be inverted?
	 */
	m_sn1->slf_cap_voltage_w((data >> 5) == 0x7 ? 2.5 : SN76477_EXTERNAL_VOLTAGE_DISCONNECT);
}


WRITE_LINE_MEMBER(toratora_state::sn1_ca2_u3_w)
{
	m_sn1->vco_w(state);
}

WRITE8_MEMBER(toratora_state::sn2_port_a_u2_w)
{
	m_sn2->vco_voltage_w(2.35 * (data & 0x7f) / 128.0);
	m_sn2->enable_w((data >> 7) & 0x01);
}


WRITE8_MEMBER(toratora_state::sn2_port_b_u2_w)
{
	static const double resistances[] =
	{
		RES_INF, /* N/C */
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51) + RES_K(100) + RES_M(240) + RES_M(2),
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51) + RES_K(100) + RES_K(240),
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51) + RES_K(100),
		RES_K(10) + RES_K(10) + RES_K(24) + RES_K(51),
		RES_K(10) + RES_K(10) + RES_K(24),
		RES_K(10) + RES_K(10),
		RES_INF
	};

	m_sn2->mixer_a_w      ((data >> 0) & 0x01);
	m_sn2->mixer_b_w      ((data >> 1) & 0x01);
	m_sn2->mixer_c_w      ((data >> 2) & 0x01);
	m_sn2->envelope_1_w   ((data >> 3) & 0x01);
	m_sn2->envelope_2_w   ((data >> 4) & 0x01);
	m_sn2->slf_res_w(resistances[(data >> 5)]);
	m_sn2->slf_cap_voltage_w((data >> 5) == 0x7 ? 2.5 : SN76477_EXTERNAL_VOLTAGE_DISCONNECT);

	/* Seems like the output should be muted in this case, but unsure of exact mechanism */
	m_sn2->amplitude_res_w((data >> 5) == 0x0 ? RES_INF : RES_K(47));
}


WRITE_LINE_MEMBER(toratora_state::sn2_ca2_u2_w)
{
	m_sn2->vco_w(state);
}


/*************************************
 *
 *  Memory handlers
 *
 *  No mirrors, all addresses are
 *  fully decoded by the hardware!
 *
 *************************************/

static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, toratora_state )
	AM_RANGE(0x0000, 0x0fff) AM_RAM
	AM_RANGE(0x1000, 0x7fff) AM_ROM  /* not fully populated */
	AM_RANGE(0x8000, 0x9fff) AM_RAM AM_SHARE("videoram")
	AM_RANGE(0xa000, 0xf047) AM_NOP
	AM_RANGE(0xf048, 0xf049) AM_NOP
	AM_RANGE(0xf04a, 0xf04a) AM_WRITE(clear_tv_w)   /* the read is mark *LEDEN, but not used */
	AM_RANGE(0xf04b, 0xf04b) AM_READWRITE(timer_r, clear_timer_w)
	AM_RANGE(0xa04c, 0xf09f) AM_NOP
	AM_RANGE(0xf0a0, 0xf0a3) AM_DEVREADWRITE("pia_u1", pia6821_device, read, write)
	AM_RANGE(0xf0a4, 0xf0a7) AM_DEVREADWRITE("pia_u2", pia6821_device, read, write)
	AM_RANGE(0xf0a8, 0xf0ab) AM_DEVREADWRITE("pia_u3", pia6821_device, read, write)
	AM_RANGE(0xf0ac, 0xf7ff) AM_NOP
	AM_RANGE(0xf800, 0xffff) AM_ROM
ADDRESS_MAP_END



/*************************************
 *
 *  Port definition
 *
 *************************************/

static INPUT_PORTS_START( toratora )
	PORT_START("INPUT")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START1 )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_COIN1 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_COIN2 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED )

	PORT_START("DSW")
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x03, "3" )
	PORT_DIPSETTING(    0x02, "2" )
	PORT_DIPSETTING(    0x03, "1" )
	PORT_DIPSETTING(    0x02, "0" )
	PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(    0x0c, "3" )
	PORT_DIPSETTING(    0x08, "2" )
	PORT_DIPSETTING(    0x04, "1" )
	PORT_DIPSETTING(    0x02, "0" )
	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x20, "3" )
	PORT_DIPSETTING(    0x00, "4" )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED )
INPUT_PORTS_END



/*************************************
 *
 *  Machine driver
 *
 *************************************/

void toratora_state::machine_start()
{
	save_item(NAME(m_timer));
	save_item(NAME(m_clear_tv));
}

void toratora_state::machine_reset()
{
	m_timer = 0xff;
	m_clear_tv = 0;
}

static MACHINE_CONFIG_START( toratora, toratora_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", M6800, 5185000 / 8) /* 5.185 MHz XTAL divided by 8 (@ U94.12) */
	MCFG_CPU_PROGRAM_MAP(main_map)
	MCFG_CPU_PERIODIC_INT_DRIVER(toratora_state, toratora_timer, 250) /* timer counting at 250 Hz */

	MCFG_DEVICE_ADD("pia_u1", PIA6821, 0)
	MCFG_PIA_WRITEPB_HANDLER(WRITE8(toratora_state,port_b_u1_w))
	MCFG_PIA_IRQA_HANDLER(WRITELINE(toratora_state,main_cpu_irq))
	MCFG_PIA_IRQB_HANDLER(WRITELINE(toratora_state,main_cpu_irq))

	MCFG_DEVICE_ADD("pia_u3", PIA6821, 0)
	MCFG_PIA_WRITEPA_HANDLER(WRITE8(toratora_state, sn1_port_a_u3_w))
	MCFG_PIA_WRITEPB_HANDLER(WRITE8(toratora_state, sn1_port_b_u3_w))
	MCFG_PIA_CA2_HANDLER(WRITELINE(toratora_state, sn1_ca2_u3_w))

	MCFG_DEVICE_ADD("pia_u2", PIA6821, 0)
	MCFG_PIA_READPB_HANDLER(IOPORT("DSW"))
	MCFG_PIA_WRITEPA_HANDLER(WRITE8(toratora_state,sn2_port_a_u2_w))
	MCFG_PIA_WRITEPB_HANDLER(WRITE8(toratora_state,sn2_port_b_u2_w))
	MCFG_PIA_CA2_HANDLER(WRITELINE(toratora_state,sn2_ca2_u2_w))
	MCFG_PIA_CB2_HANDLER(WRITELINE(toratora_state,cb2_u2_w))

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_SIZE(256, 256)
	MCFG_SCREEN_VISIBLE_AREA(0,256-1,8,248-1)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MCFG_SCREEN_UPDATE_DRIVER(toratora_state, screen_update_toratora)

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

	MCFG_SOUND_ADD("sn1", SN76477, 0)
	MCFG_SN76477_NOISE_PARAMS(RES_K(47), RES_K(470), CAP_P(470)) // noise + filter
	MCFG_SN76477_DECAY_RES(RES_M(2))                     // decay_res
	MCFG_SN76477_ATTACK_PARAMS(CAP_U(0.2),  RES_K(3.3))  // attack_decay_cap + attack_res
	MCFG_SN76477_AMP_RES(RES_K(47))                      // amplitude_res
	MCFG_SN76477_FEEDBACK_RES(RES_K(50))                 // feedback_res
	MCFG_SN76477_VCO_PARAMS(0, CAP_U(0.1), RES_K(51))    // VCO volt + cap + res
	MCFG_SN76477_PITCH_VOLTAGE(5.0)                      // pitch_voltage
	MCFG_SN76477_SLF_PARAMS(CAP_U(1.0), RES_K(10))       // slf caps + res
	MCFG_SN76477_ONESHOT_PARAMS(CAP_U(0.1), RES_K(100))  // oneshot caps + res
	MCFG_SN76477_VCO_MODE(0)                             // VCO mode
	MCFG_SN76477_MIXER_PARAMS(0, 0, 0)                   // mixer A, B, C
	MCFG_SN76477_ENVELOPE_PARAMS(0, 0)                   // envelope 1, 2
	MCFG_SN76477_ENABLE(1)                               // enable
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	MCFG_SOUND_ADD("sn2", SN76477, 0)
	MCFG_SN76477_NOISE_PARAMS(RES_K(47), RES_K(470), CAP_P(470)) // noise + filter
	MCFG_SN76477_DECAY_RES(RES_M(2))                     // decay_res
	MCFG_SN76477_ATTACK_PARAMS(CAP_U(0.2),  RES_K(3.3))  // attack_decay_cap + attack_res
	MCFG_SN76477_AMP_RES(RES_K(47))                      // amplitude_res
	MCFG_SN76477_FEEDBACK_RES(RES_K(50))                 // feedback_res
	MCFG_SN76477_VCO_PARAMS(0, CAP_U(0.1), RES_K(51))    // VCO volt + cap + res
	MCFG_SN76477_PITCH_VOLTAGE(5.0)                      // pitch_voltage
	MCFG_SN76477_SLF_PARAMS(CAP_U(1.0), RES_K(10))       // slf caps + res
	MCFG_SN76477_ONESHOT_PARAMS(CAP_U(0.1), RES_K(100))  // oneshot caps + res
	MCFG_SN76477_VCO_MODE(0)                             // VCO mode
	MCFG_SN76477_MIXER_PARAMS(0, 0, 0)                   // mixer A, B, C
	MCFG_SN76477_ENVELOPE_PARAMS(0, 0)                   // envelope 1, 2
	MCFG_SN76477_ENABLE(1)                               // enable
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

MACHINE_CONFIG_END



/*************************************
 *
 *  ROM definition
 *
 *************************************/

ROM_START( toratora )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "tora.u1",  0x1000, 0x0800, CRC(413c743a) SHA1(a887dfaaee557327a1699bb424488b934dab8612) )
	ROM_LOAD( "tora.u10", 0x1800, 0x0800, CRC(dc771b1c) SHA1(1bd81decb4d0a854878227c52d45ac0eea0602ec) )
	ROM_LOAD( "tora.u2",  0x2000, 0x0800, CRC(c574c664) SHA1(9f41a53ca51d04e5bec7525fe83c5f4bdfcf128d) )
	ROM_LOAD( "tora.u9",  0x2800, 0x0800, CRC(b67aa11f) SHA1(da9e77255640a4b32eed2be89b686b98a248bd72) )
	ROM_LOAD( "tora.u11", 0xf800, 0x0800, CRC(55135d6f) SHA1(c48f180a9d6e894aafe87b2daf74e9a082f4600e) )
ROM_END

/* Tora Tora? Game Plan?
Etched in copper on top of board        20-00047C
                        20-10051A

Etched in copper on back of daughter board  20-00048C
                        20-10052A

ROM text showed     TORA TOR*       * was A with bit 7 set
            1980 GAME PLAN,INC

and  war stuff (PLANE, BOMB, SQUAD, etc)

.u2 2716    handwritten sticker U-2
.u9 2716    handwritten sticker U-9
.u10    2716    handwritten sticker U-10
.u11    2716    handwritten sticker U-11

open 24 pin socket @ U1 and U3
open 40 pin socket @ U42

Main board
crystal with 5 185 on the top
5280    x8
socketed    ds8833  x2
socketed    ds8t28  x2

Daughter board
open 40 pin socket @ U3 @ U2
76477   X2 */

ROM_START( toratorab )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "1027.u1",  0x1000, 0x0800, BAD_DUMP CRC(413c743a) SHA1(a887dfaaee557327a1699bb424488b934dab8612) ) /* rom u1 is missing in this set, using the toratora one */
	ROM_LOAD( "1027.u10", 0x1800, 0x0800, CRC(6a906292) SHA1(4ceff91b7dcd398e57cd19a91d2199c09cb37c39) )
	ROM_LOAD( "1027.u2",  0x2000, 0x0800, CRC(c1331648) SHA1(379101c6c1b8dab3e043ece01579cc96f6bb18a9) )
	ROM_LOAD( "1027.u9",  0x2800, 0x0800, CRC(59b021b5) SHA1(ea5a0c1f58c0e08231969ad161b79af6e1ae4431) )
	ROM_LOAD( "1027.u11", 0xf800, 0x0800, CRC(336f6659) SHA1(ea1151db54b68316908874da6983d6de5c94c29e) )
ROM_END


/*************************************
 *
 *  Game driver
 *
 *************************************/

GAME( 1980, toratora, 0,        toratora, toratora, driver_device, 0, ROT90, "Game Plan", "Tora Tora (prototype?)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
GAME( 1980, toratorab,toratora, toratora, toratora, driver_device, 0, ROT90, "Game Plan", "Tora Tora (set 2)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )