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path: root/src/mame/drivers/a2600.cpp
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// license:BSD-3-Clause
// copyright-holders:Nathan Woods, Wilbert Pol
/***************************************************************************

  Atari VCS 2600 driver

TODO:
- Move the 2 32-in-1 rom dumps into their own driver
- Add 128-in-1 driver

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

// the new RIOT does not work with the SuperCharger
// for example "mame a2600 scharger -cass offifrog" fails to load after playing the tape

#include "emu.h"

#include "includes/a2600.h"

#include "emupal.h"
#include "screen.h"
#include "softlist.h"
#include "speaker.h"


static constexpr auto MASTER_CLOCK_NTSC = 3.579575_MHz_XTAL;
static constexpr auto MASTER_CLOCK_PAL  = 3.546894_MHz_XTAL;

static const uint16_t supported_screen_heights[4] = { 262, 312, 328, 342 };


void a2600_base_state::a2600_mem(address_map &map) // 6507 has 13-bit address space, 0x0000 - 0x1fff
{
	map(0x0000, 0x007f).mirror(0x0f00).rw(m_tia, FUNC(tia_video_device::read), FUNC(tia_video_device::write));
	map(0x0080, 0x00ff).mirror(0x0d00).ram().share("riot_ram");
#if USE_NEW_RIOT
	map(0x0280, 0x029f).mirror(0x0d00).m("riot", FUNC(mos6532_t::io_map));
#else
	map(0x0280, 0x029f).mirror(0x0d00).rw("riot", FUNC(riot6532_device::read), FUNC(riot6532_device::write));
#endif
	// map(0x1000, 0x1fff) is cart data and it is configured at reset time, depending on the mounted cart!
}


uint8_t a2600_state::cart_over_all_r(address_space &space, offs_t offset)
{
	if (!machine().side_effects_disabled())
		m_cart->write_bank(space, offset, 0);

	int masked_offset = offset &~ 0x0d00;
	uint8_t ret = 0x00;

	if (masked_offset < 0x80)
	{
		ret = m_tia->read(masked_offset&0x7f);
	}
	else if (masked_offset < 0x100)
	{
		ret = m_riot_ram[masked_offset & 0x7f];
	}
	/* 0x100 - 0x1ff already masked out */
	else if (masked_offset < 0x280)
	{
		ret = m_tia->read(masked_offset&0x7f);
	}
	else if (masked_offset < 0x2a0)
	{
#if USE_NEW_RIOT
		ret = m_riot->io_r(masked_offset);
#else
		ret = m_riot->read(masked_offset);
#endif
	}
	else if (masked_offset < 0x300)
	{
		/* 0x2a0 - 0x2ff nothing? */
	}
	/* 0x300 - 0x3ff already masked out */

	return ret;
}

void a2600_state::cart_over_all_w(address_space &space, offs_t offset, uint8_t data)
{
	m_cart->write_bank(space, offset, 0);

	int masked_offset = offset &~ 0x0d00;

	if (masked_offset < 0x80)
	{
		m_tia->write(masked_offset & 0x7f, data);
	}
	else if (masked_offset < 0x100)
	{
		m_riot_ram[masked_offset & 0x7f] = data;
	}
	/* 0x100 - 0x1ff already masked out */
	else if (masked_offset < 0x280)
	{
		m_tia->write(masked_offset & 0x7f, data);
	}
	else if (masked_offset < 0x2a0)
	{
#if USE_NEW_RIOT
		m_riot->io_w(masked_offset, data);
#else
		m_riot->write(masked_offset, data);
#endif
	}
	else if (masked_offset < 0x300)
	{
		/* 0x2a0 - 0x2ff nothing? */
	}
	/* 0x300 - 0x3ff already masked out */
}

void a2600_base_state::switch_A_w(uint8_t data)
{
	/* Left controller port */
	m_joy1->joy_w( data >> 4 );

	/* Right controller port */
	m_joy2->joy_w( data & 0x0f );

//  switch( ioport("CONTROLLERS")->read() % 16 )
//  {
//  case 0x0a:  /* KidVid voice module */
//      m_cassette->change_state(( data & 0x02 ) ? CASSETTE_MOTOR_DISABLED : (CASSETTE_MOTOR_ENABLED | CASSETTE_PLAY), CASSETTE_MOTOR_DISABLED );
//      break;
//  }
}

uint8_t a2600_base_state::switch_A_r()
{
	uint8_t val = 0;

	// Left controller port PINs 1-4 ( 4321 )
	val |= (m_joy1->read_joy() & 0x0f) << 4;

	// Right controller port PINs 1-4 ( 4321 )
	val |= m_joy2->read_joy() & 0x0f;

	return val;
}

void a2600_base_state::switch_B_w(uint8_t data)
{
}

WRITE_LINE_MEMBER(a2600_base_state::irq_callback)
{
}

uint16_t a2600_base_state::a2600_read_input_port(offs_t offset)
{
	switch (offset)
	{
	case 0: // Left controller port PIN 5
		return m_joy1->read_pot_x();

	case 1: // Left controller port PIN 9
		return m_joy1->read_pot_y();

	case 2: // Right controller port PIN 5
		return m_joy2->read_pot_x();

	case 3: // Right controller port PIN 9
		return m_joy2->read_pot_y();

	case 4: // Left controller port PIN 6
		return (m_joy1->read_joy() & 0x20) ? 0xff : 0x7f;

	case 5: // Right controller port PIN 6
		return (m_joy2->read_joy() & 0x20) ? 0xff : 0x7f;
	}
	return 0xff;
}

/* There are a few games that do an LDA ($80-$FF),Y instruction.
   The contents off the databus then depend on whatever was read
   from the RAM. To do this really properly the 6502 core would
   need to keep track of the last databus contents so we can query
   that. For now this is a quick hack to determine that value anyway.
   Examples:
   Q-Bert's Qubes (NTSC,F6) at 0x1594
   Berzerk at 0xF093.
*/
uint8_t a2600_base_state::a2600_get_databus_contents(offs_t offset)
{
	uint16_t  last_address, prev_address;
	uint8_t   last_byte, prev_byte;
	address_space& prog_space = m_maincpu->space(AS_PROGRAM);

	last_address = m_maincpu->pc() + 1;
	if ( ! ( last_address & 0x1080 ) )
	{
		return offset;
	}
	last_byte = prog_space.read_byte(last_address );
	if ( last_byte < 0x80 || last_byte == 0xFF )
	{
		return last_byte;
	}
	prev_address = last_address - 1;
	if ( ! ( prev_address & 0x1080 ) )
	{
		return last_byte;
	}
	prev_byte = prog_space.read_byte(prev_address );
	if ( prev_byte == 0xB1 )
	{   /* LDA (XX),Y */
		return prog_space.read_byte(last_byte + 1 );
	}
	return last_byte;
}

#if 0
static const rectangle visarea[4] = {
	{ 26, 26 + 160 + 16, 24, 24 + 192 + 31 },   /* 262 */
	{ 26, 26 + 160 + 16, 32, 32 + 228 + 31 },   /* 312 */
	{ 26, 26 + 160 + 16, 45, 45 + 240 + 31 },   /* 328 */
	{ 26, 26 + 160 + 16, 48, 48 + 240 + 31 }    /* 342 */
};
#endif

void a2600_base_state::a2600_tia_vsync_callback(uint16_t data)
{
	for ( int i = 0; i < std::size(supported_screen_heights); i++ )
	{
		if ( data >= supported_screen_heights[i] - 3 && data <= supported_screen_heights[i] + 3 )
		{
			if ( supported_screen_heights[i] != m_current_screen_height )
			{
				m_current_screen_height = supported_screen_heights[i];
//              m_screen->configure(228, m_current_screen_height, &visarea[i], HZ_TO_ATTOSECONDS( MASTER_CLOCK_NTSC ) * 228 * m_current_screen_height );
			}
		}
	}
}

void a2600_base_state::a2600_tia_vsync_callback_pal(uint16_t data)
{
	for ( int i = 0; i < std::size(supported_screen_heights); i++ )
	{
		if ( data >= supported_screen_heights[i] - 3 && data <= supported_screen_heights[i] + 3 )
		{
			if ( supported_screen_heights[i] != m_current_screen_height )
			{
				m_current_screen_height = supported_screen_heights[i];
//              m_screen->configure(228, m_current_screen_height, &visarea[i], HZ_TO_ATTOSECONDS( MASTER_CLOCK_PAL ) * 228 * m_current_screen_height );
			}
		}
	}
}

// TODO: is this the correct behavior for the real hardware?!?
uint8_t a2600_state::cart_over_riot_r(address_space &space, offs_t offset)
{
	if (!machine().side_effects_disabled())
		m_cart->write_bank(space, offset, 0);
	return m_riot_ram[0x20 + offset];
}

void a2600_state::cart_over_riot_w(address_space &space, offs_t offset, uint8_t data)
{
	m_cart->write_bank(space, offset, 0);
	m_riot_ram[0x20 + offset] = data;

}

void a2600_state::cart_over_tia_w(address_space &space, offs_t offset, uint8_t data)
{
	// Both Cart & TIA see these addresses
	m_cart->write_bank(space, offset, data);
	m_tia->write(offset, data);
}

void a2600_base_state::machine_start()
{
	m_current_screen_height = m_screen->height();
	memset(m_riot_ram, 0x00, 0x80);

	save_item(NAME(m_current_screen_height));
}

void a2600_state::machine_start()
{
	a2600_base_state::machine_start();

	switch (m_cart->get_cart_type())
	{
	case A26_2K:
	case A26_4K:
	case A26_F4:
	case A26_F8:
	case A26_F8SW:
	case A26_FA:
	case A26_E0:
	case A26_E7:
	case A26_CV:
	case A26_DC:
	case A26_FV:
	case A26_8IN1:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x1000, 0x1fff, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		break;
	case A26_F6:
	case A26_DPC:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x1000, 0x1fff, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		break;
	case A26_FE:
		m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)), write8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_ram)));
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x01fe, 0x01ff, read8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_bank)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x01fe, 0x01fe, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		break;
	case A26_3E:
		m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)), write8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_ram)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x00, 0x3f, write8m_delegate(*this, FUNC(a2600_state::cart_over_tia_w)));
		break;
	case A26_3F:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x00, 0x3f, write8m_delegate(*this, FUNC(a2600_state::cart_over_tia_w)));
		break;
	case A26_UA:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x200, 0x27f, read8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_bank)), write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		break;
	case A26_JVP:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x1000, 0x1fff, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		// to verify the actual behavior...
		m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xfa0, 0xfc0, read8m_delegate(*this, FUNC(a2600_state::cart_over_riot_r)), write8m_delegate(*this, FUNC(a2600_state::cart_over_riot_w)));
		break;
	case A26_4IN1:
	case A26_32IN1:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		break;
	case A26_SS:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		break;
	case A26_CM:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		break;
	case A26_X07:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x1000, 0x1fff, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x0000, 0x0fff, read8m_delegate(*this, FUNC(a2600_state::cart_over_all_r)), write8m_delegate(*this, FUNC(a2600_state::cart_over_all_w)));
		break;
	case A26_HARMONY:
		m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_cart, FUNC(vcs_cart_slot_device::read_rom)));
		m_maincpu->space(AS_PROGRAM).install_write_handler(0x1000, 0x1fff, write8m_delegate(*m_cart, FUNC(vcs_cart_slot_device::write_bank)));
		break;
	}
}


static INPUT_PORTS_START( a2600 )
	PORT_START("SWB")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Reset Game") PORT_CODE(KEYCODE_2)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Select Game") PORT_CODE(KEYCODE_1)
	PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_DIPNAME( 0x08, 0x08, "TV Type" ) PORT_CODE(KEYCODE_C) PORT_TOGGLE
	PORT_DIPSETTING(    0x08, "Color" )
	PORT_DIPSETTING(    0x00, "B&W" )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_DIPNAME( 0x40, 0x00, "Left Diff. Switch" ) PORT_CODE(KEYCODE_3) PORT_TOGGLE
	PORT_DIPSETTING(    0x40, "A" )
	PORT_DIPSETTING(    0x00, "B" )
	PORT_DIPNAME( 0x80, 0x00, "Right Diff. Switch" ) PORT_CODE(KEYCODE_4) PORT_TOGGLE
	PORT_DIPSETTING(    0x80, "A" )
	PORT_DIPSETTING(    0x00, "B" )
INPUT_PORTS_END


static void a2600_cart(device_slot_interface &device)
{
	device.option_add("a26_2k",    A26_ROM_2K);
	device.option_add("a26_4k",    A26_ROM_4K);
	device.option_add("a26_f4",    A26_ROM_F4);
	device.option_add("a26_f6",    A26_ROM_F6);
	device.option_add("a26_f8",    A26_ROM_F8);
	device.option_add("a26_f8sw",  A26_ROM_F8_SW);
	device.option_add("a26_fa",    A26_ROM_FA);
	device.option_add("a26_fe",    A26_ROM_FE);
	device.option_add("a26_3e",    A26_ROM_3E);
	device.option_add("a26_3f",    A26_ROM_3F);
	device.option_add("a26_e0",    A26_ROM_E0);
	device.option_add("a26_e7",    A26_ROM_E7);
	device.option_add("a26_ua",    A26_ROM_UA);
	device.option_add("a26_cv",    A26_ROM_CV);
	device.option_add("a26_dc",    A26_ROM_DC);
	device.option_add("a26_fv",    A26_ROM_FV);
	device.option_add("a26_jvp",   A26_ROM_JVP);
	device.option_add("a26_cm",    A26_ROM_COMPUMATE);
	device.option_add("a26_ss",    A26_ROM_SUPERCHARGER);
	device.option_add("a26_dpc",   A26_ROM_DPC);
	device.option_add("a26_4in1",  A26_ROM_4IN1);
	device.option_add("a26_8in1",  A26_ROM_8IN1);
	device.option_add("a26_32in1", A26_ROM_32IN1);
	device.option_add("a26_x07",   A26_ROM_X07);
	device.option_add("a26_harmony",   A26_ROM_HARMONY);
}

void a2600_state::a2600_cartslot(machine_config &config)
{
	VCS_CART_SLOT(config, "cartslot", a2600_cart, nullptr);

	/* software lists */
	SOFTWARE_LIST(config, "cart_list").set_original("a2600");
	SOFTWARE_LIST(config, "cass_list").set_original("a2600_cass");
}

void a2600_state::a2600(machine_config &config)
{
	/* basic machine hardware */
	M6507(config, m_maincpu, MASTER_CLOCK_NTSC / 3);
	m_maincpu->set_addrmap(AS_PROGRAM, &a2600_state::a2600_mem);

	/* video hardware */
	TIA_NTSC_VIDEO(config, m_tia, 0, "tia");
	m_tia->read_input_port_callback().set(FUNC(a2600_state::a2600_read_input_port));
	m_tia->databus_contents_callback().set(FUNC(a2600_state::a2600_get_databus_contents));
	m_tia->vsync_callback().set(FUNC(a2600_state::a2600_tia_vsync_callback));

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_raw(MASTER_CLOCK_NTSC, 228, 26, 26 + 160 + 16, 262, 24 , 24 + 192 + 31);
	m_screen->set_screen_update("tia_video", FUNC(tia_video_device::screen_update));

	/* sound hardware */
	SPEAKER(config, "mono").front_center();
	TIA(config, "tia", MASTER_CLOCK_NTSC/114).add_route(ALL_OUTPUTS, "mono", 0.90);

	/* devices */
#if USE_NEW_RIOT
	MOS6532_NEW(config, m_riot, MASTER_CLOCK_NTSC / 3);
	m_riot->pa_rd_callback().set(FUNC(a2600_state::switch_A_r));
	m_riot->pa_wr_callback().set(FUNC(a2600_state::switch_A_w));
	m_riot->pb_rd_callback().set_ioport("SWB");
	m_riot->pb_wr_callback().set(FUNC(a2600_state::switch_B_w));
	m_riot->irq_wr_callback().set(FUNC(a2600_state::irq_callback));
#else
	RIOT6532(config, m_riot, MASTER_CLOCK_NTSC / 3);
	m_riot->in_pa_callback().set(FUNC(a2600_state::switch_A_r));
	m_riot->out_pa_callback().set(FUNC(a2600_state::switch_A_w));
	m_riot->in_pb_callback().set_ioport("SWB");
	m_riot->out_pb_callback().set(FUNC(a2600_state::switch_B_w));
	m_riot->irq_callback().set(FUNC(a2600_state::irq_callback));
#endif

	VCS_CONTROL_PORT(config, CONTROL1_TAG, vcs_control_port_devices, "joy");
	VCS_CONTROL_PORT(config, CONTROL2_TAG, vcs_control_port_devices, nullptr);

	a2600_cartslot(config);
	subdevice<software_list_device>("cart_list")->set_filter("NTSC");
}


void a2600_state::a2600p(machine_config &config)
{
	/* basic machine hardware */
	M6507(config, m_maincpu, MASTER_CLOCK_PAL / 3);
	m_maincpu->set_addrmap(AS_PROGRAM, &a2600_state::a2600_mem);

	/* video hardware */
	TIA_PAL_VIDEO(config, m_tia, 0, "tia");
	m_tia->read_input_port_callback().set(FUNC(a2600_state::a2600_read_input_port));
	m_tia->databus_contents_callback().set(FUNC(a2600_state::a2600_get_databus_contents));
	m_tia->vsync_callback().set(FUNC(a2600_state::a2600_tia_vsync_callback_pal));

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_raw(MASTER_CLOCK_PAL, 228, 26, 26 + 160 + 16, 312, 32, 32 + 228 + 31);
	m_screen->set_screen_update("tia_video", FUNC(tia_video_device::screen_update));

	/* sound hardware */
	SPEAKER(config, "mono").front_center();
	TIA(config, "tia", MASTER_CLOCK_PAL/114).add_route(ALL_OUTPUTS, "mono", 0.90);

	/* devices */
#if USE_NEW_RIOT
	MOS6532_NEW(config, m_riot, MASTER_CLOCK_PAL / 3);
	m_riot->pa_rd_callback().set(FUNC(a2600_state::switch_A_r));
	m_riot->pa_wr_callback().set(FUNC(a2600_state::switch_A_w));
	m_riot->pb_rd_callback().set_ioport("SWB");
	m_riot->pb_wr_callback().set(FUNC(a2600_state::switch_B_w));
	m_riot->irq_wr_callback().set(FUNC(a2600_state::irq_callback));
#else
	RIOT6532(config, m_riot, MASTER_CLOCK_PAL / 3);
	m_riot->in_pa_callback().set(FUNC(a2600_state::switch_A_r));
	m_riot->out_pa_callback().set(FUNC(a2600_state::switch_A_w));
	m_riot->in_pb_callback().set_ioport("SWB");
	m_riot->out_pb_callback().set(FUNC(a2600_state::switch_B_w));
	m_riot->irq_callback().set(FUNC(a2600_state::irq_callback));
#endif

	VCS_CONTROL_PORT(config, CONTROL1_TAG, vcs_control_port_devices, "joy");
	VCS_CONTROL_PORT(config, CONTROL2_TAG, vcs_control_port_devices, nullptr);

	a2600_cartslot(config);
	subdevice<software_list_device>("cart_list")->set_filter("PAL");
}


ROM_START( a2600 )
	ROM_REGION( 0x2000, "maincpu", ROMREGION_ERASEFF )
ROM_END

#define rom_a2600p rom_a2600

/*    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT  CLASS        INIT        COMPANY     FULLNAME */
CONS( 1977, a2600,  0,      0,      a2600,   a2600, a2600_state, empty_init, "Atari",    "Atari 2600 (NTSC)" , MACHINE_SUPPORTS_SAVE )
CONS( 1978, a2600p, a2600,  0,      a2600p,  a2600, a2600_state, empty_init, "Atari",    "Atari 2600 (PAL)",   MACHINE_SUPPORTS_SAVE )