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path: root/src/mame/drivers/vic10.cpp
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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*

    TODO:

    - memory mapping with PLA
    - PLA dump

*/

#include "emu.h"
#include "screen.h"
#include "softlist.h"
#include "speaker.h"
#include "bus/pet/cass.h"
#include "bus/vic10/exp.h"
#include "bus/vcs_ctrl/ctrl.h"
#include "cpu/m6502/m6510.h"
#include "machine/mos6526.h"
#include "machine/ram.h"
#include "sound/mos6581.h"
#include "video/mos6566.h"

#define M6510_TAG       "u3"
#define MOS6566_TAG     "u2"
#define MOS6581_TAG     "u6"
#define MOS6526_TAG     "u9"
#define SCREEN_TAG      "screen"
#define TIMER_C1531_TAG "c1531"
#define CONTROL1_TAG    "joy1"
#define CONTROL2_TAG    "joy2"

class vic10_state : public driver_device
{
public:
	vic10_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, M6510_TAG),
		m_vic(*this, MOS6566_TAG),
		m_sid(*this, MOS6581_TAG),
		m_cia(*this, MOS6526_TAG),
		m_joy1(*this, CONTROL1_TAG),
		m_joy2(*this, CONTROL2_TAG),
		m_exp(*this, VIC10_EXPANSION_SLOT_TAG),
		m_ram(*this, RAM_TAG),
		m_cassette(*this, PET_DATASSETTE_PORT_TAG),
		m_color_ram(*this, "color_ram"),
		m_row(*this, "ROW%u", 0),
		m_restore(*this, "RESTORE"),
		m_lock(*this, "LOCK"),
		m_cia_irq(CLEAR_LINE),
		m_vic_irq(CLEAR_LINE),
		m_exp_irq(CLEAR_LINE)
	{ }

	required_device<m6510_device> m_maincpu;
	required_device<mos6566_device> m_vic;
	required_device<mos6581_device> m_sid;
	required_device<mos6526_device> m_cia;
	required_device<vcs_control_port_device> m_joy1;
	required_device<vcs_control_port_device> m_joy2;
	required_device<vic10_expansion_slot_device> m_exp;
	required_device<ram_device> m_ram;
	optional_device<pet_datassette_port_device> m_cassette;
	optional_shared_ptr<uint8_t> m_color_ram;
	required_ioport_array<8> m_row;
	required_ioport m_restore;
	required_ioport m_lock;

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

	void check_interrupts();

	DECLARE_READ8_MEMBER( read );
	DECLARE_WRITE8_MEMBER( write );

	DECLARE_WRITE_LINE_MEMBER( vic_irq_w );
	DECLARE_READ8_MEMBER( vic_videoram_r );
	DECLARE_READ8_MEMBER( vic_colorram_r );

	DECLARE_READ8_MEMBER( sid_potx_r );
	DECLARE_READ8_MEMBER( sid_poty_r );

	DECLARE_WRITE_LINE_MEMBER( cia_irq_w );
	DECLARE_READ8_MEMBER( cia_pa_r );
	DECLARE_READ8_MEMBER( cia_pb_r );
	DECLARE_WRITE8_MEMBER( cia_pb_w );

	DECLARE_READ8_MEMBER( cpu_r );
	DECLARE_WRITE8_MEMBER( cpu_w );

	DECLARE_WRITE_LINE_MEMBER( exp_irq_w );
	DECLARE_WRITE_LINE_MEMBER( exp_reset_w );

	// interrupt state
	int m_cia_irq;
	int m_vic_irq;
	int m_exp_irq;
	void vic10(machine_config &config);
	void vic10_mem(address_map &map);
	void vic_colorram_map(address_map &map);
	void vic_videoram_map(address_map &map);
};


//**************************************************************************
//  INTERRUPTS
//**************************************************************************

//-------------------------------------------------
//  check_interrupts -
//-------------------------------------------------

void vic10_state::check_interrupts()
{
	m_maincpu->set_input_line(M6502_IRQ_LINE, m_cia_irq || m_vic_irq || m_exp_irq);
}



//**************************************************************************
//  MEMORY MANAGEMENT
//**************************************************************************

//-------------------------------------------------
//  read -
//-------------------------------------------------

READ8_MEMBER( vic10_state::read )
{
	// TODO this is really handled by the PLA

	uint8_t data = m_vic->bus_r();
	int lorom = 1, uprom = 1, exram = 1;

	if (offset < 0x800)
	{
		data = m_ram->pointer()[offset];
	}
	else if (offset < 0x1000)
	{
		exram = 0;
	}
	else if (offset >= 0x8000 && offset < 0xa000)
	{
		lorom = 0;
	}
	else if (offset >= 0xd000 && offset < 0xd400)
	{
		data = m_vic->read(space, offset & 0x3f);
	}
	else if (offset >= 0xd400 && offset < 0xd800)
	{
		data = m_sid->read(space, offset & 0x1f);
	}
	else if (offset >= 0xd800 && offset < 0xdc00)
	{
		data = m_color_ram[offset & 0x3ff];
	}
	else if (offset >= 0xdc00 && offset < 0xe000)
	{
		data = m_cia->read(space, offset & 0x0f);
	}
	else if (offset >= 0xe000)
	{
		uprom = 0;
	}

	return m_exp->cd_r(space, offset, data, lorom, uprom, exram);
}


//-------------------------------------------------
//  write -
//-------------------------------------------------

WRITE8_MEMBER( vic10_state::write )
{
	// TODO this is really handled by the PLA

	int lorom = 1, uprom = 1, exram = 1;

	if (offset < 0x800)
	{
		m_ram->pointer()[offset] = data;
	}
	else if (offset < 0x1000)
	{
		exram = 0;
	}
	else if (offset >= 0xd000 && offset < 0xd400)
	{
		m_vic->write(space, offset & 0x3f, data);
	}
	else if (offset >= 0xd400 && offset < 0xd800)
	{
		m_sid->write(space, offset & 0x1f, data);
	}
	else if (offset >= 0xd800 && offset < 0xdc00)
	{
		m_color_ram[offset & 0x3ff] = data & 0x0f;
	}
	else if (offset >= 0xdc00 && offset < 0xe000)
	{
		m_cia->write(space, offset & 0x0f, data);
	}

	m_exp->cd_w(space, offset, data, lorom, uprom, exram);
}


//-------------------------------------------------
//  vic_videoram_r -
//-------------------------------------------------

READ8_MEMBER( vic10_state::vic_videoram_r )
{
	address_space &program = m_maincpu->space(AS_PROGRAM);

	if (offset < 0x3000)
		return program.read_byte(offset);

	return program.read_byte(0xe000 + (offset & 0x1fff));
}


//-------------------------------------------------
//  vic_colorram_r -
//-------------------------------------------------

READ8_MEMBER( vic10_state::vic_colorram_r )
{
	return m_color_ram[offset];
}



//**************************************************************************
//  ADDRESS MAPS
//**************************************************************************

//-------------------------------------------------
//  ADDRESS_MAP( vic10_mem )
//-------------------------------------------------

void vic10_state::vic10_mem(address_map &map)
{
	map(0x0000, 0xffff).rw(FUNC(vic10_state::read), FUNC(vic10_state::write));
}


//-------------------------------------------------
//  ADDRESS_MAP( vic_videoram_map )
//-------------------------------------------------

void vic10_state::vic_videoram_map(address_map &map)
{
	map(0x0000, 0x3fff).r(FUNC(vic10_state::vic_videoram_r));
}


//-------------------------------------------------
//  ADDRESS_MAP( vic_colorram_map )
//-------------------------------------------------

void vic10_state::vic_colorram_map(address_map &map)
{
	map(0x000, 0x3ff).r(FUNC(vic10_state::vic_colorram_r));
}



//**************************************************************************
//  INPUT PORTS
//**************************************************************************

//-------------------------------------------------
//  INPUT_PORTS( vic10 )
//-------------------------------------------------

static INPUT_PORTS_START( vic10 )
	PORT_START( "ROW0" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Crsr Down Up") PORT_CODE(KEYCODE_RALT)        PORT_CHAR(UCHAR_MAMEKEY(DOWN)) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F3)                                    PORT_CHAR(UCHAR_MAMEKEY(F5))
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F2)                                    PORT_CHAR(UCHAR_MAMEKEY(F3))
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F1)                                    PORT_CHAR(UCHAR_MAMEKEY(F1))
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F4)                                    PORT_CHAR(UCHAR_MAMEKEY(F7))
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Crsr Right Left") PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_MAMEKEY(RIGHT)) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER)             PORT_CHAR(13)
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("INST DEL") PORT_CODE(KEYCODE_BACKSPACE)       PORT_CHAR(8) PORT_CHAR(UCHAR_MAMEKEY(INSERT))

	PORT_START( "ROW1" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Shift (Left)") PORT_CODE(KEYCODE_LSHIFT)      PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E)         PORT_CHAR('E')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S)         PORT_CHAR('S')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z)         PORT_CHAR('Z')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4)         PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A)         PORT_CHAR('A')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W)         PORT_CHAR('W')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3)         PORT_CHAR('3') PORT_CHAR('#')

	PORT_START( "ROW2" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X)         PORT_CHAR('X')
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_T)         PORT_CHAR('T')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F)         PORT_CHAR('F')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C)         PORT_CHAR('C')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6)         PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D)         PORT_CHAR('D')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R)         PORT_CHAR('R')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5)         PORT_CHAR('5') PORT_CHAR('%')

	PORT_START( "ROW3" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V)         PORT_CHAR('V')
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U)         PORT_CHAR('U')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H)         PORT_CHAR('H')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B)         PORT_CHAR('B')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8)         PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G)         PORT_CHAR('G')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Y)         PORT_CHAR('Y')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7)         PORT_CHAR('7') PORT_CHAR('\'')

	PORT_START( "ROW4" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N)         PORT_CHAR('N')
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_O)         PORT_CHAR('O')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K)         PORT_CHAR('K')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M)         PORT_CHAR('M')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)         PORT_CHAR('0')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J)         PORT_CHAR('J')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I)         PORT_CHAR('I')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9)         PORT_CHAR('9') PORT_CHAR(')')

	PORT_START( "ROW5" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA)     PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('@')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON)     PORT_CHAR(':') PORT_CHAR('[')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_STOP)      PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS)    PORT_CHAR('-')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L)         PORT_CHAR('L')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_P)         PORT_CHAR('P')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS)     PORT_CHAR('+')

	PORT_START( "ROW6" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH)                             PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("\xE2\x86\x91  Pi") PORT_CODE(KEYCODE_DEL) PORT_CHAR(0x2191) PORT_CHAR(0x03C0)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSLASH)                         PORT_CHAR('=')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Shift (Right)") PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CLR HOME") PORT_CODE(KEYCODE_INSERT)      PORT_CHAR(UCHAR_MAMEKEY(HOME))
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_QUOTE)                             PORT_CHAR(';') PORT_CHAR(']')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_CLOSEBRACE)                        PORT_CHAR('*')
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSLASH2)                        PORT_CHAR(0xA3)

	PORT_START( "ROW7" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RUN STOP") PORT_CODE(KEYCODE_HOME)
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q)                                 PORT_CHAR('Q')
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CBM") PORT_CODE(KEYCODE_LALT)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SPACE)                             PORT_CHAR(' ')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2)                                 PORT_CHAR('2') PORT_CHAR('"')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_TAB)                               PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("\xE2\x86\x90") PORT_CODE(KEYCODE_TILDE)   PORT_CHAR(0x2190)
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1)                                 PORT_CHAR('1') PORT_CHAR('!')

	PORT_START( "RESTORE" )
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RESTORE") PORT_CODE(KEYCODE_PRTSCR)

	PORT_START( "LOCK" )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("SHIFT LOCK") PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_BIT( 0x7f, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END



//**************************************************************************
//  DEVICE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  vic2_interface vic_intf
//-------------------------------------------------

WRITE_LINE_MEMBER( vic10_state::vic_irq_w )
{
	m_vic_irq = state;

	check_interrupts();
}


//-------------------------------------------------
//  sid6581_interface sid_intf
//-------------------------------------------------

READ8_MEMBER( vic10_state::sid_potx_r )
{
	uint8_t data = 0xff;

	switch (m_cia->read_pa() >> 6)
	{
	case 1: data = m_joy1->read_pot_x(); break;
	case 2: data = m_joy2->read_pot_x(); break;
	case 3:
		if (m_joy1->has_pot_x() && m_joy2->has_pot_x())
		{
			data = 1 / (1 / m_joy1->read_pot_x() + 1 / m_joy2->read_pot_x());
		}
		else if (m_joy1->has_pot_x())
		{
			data = m_joy1->read_pot_x();
		}
		else if (m_joy2->has_pot_x())
		{
			data = m_joy2->read_pot_x();
		}
		break;
	}

	return data;
}

READ8_MEMBER( vic10_state::sid_poty_r )
{
	uint8_t data = 0xff;

	switch (m_cia->read_pa() >> 6)
	{
	case 1: data = m_joy1->read_pot_y(); break;
	case 2: data = m_joy2->read_pot_y(); break;
	case 3:
		if (m_joy1->has_pot_y() && m_joy2->has_pot_y())
		{
			data = 1 / (1 / m_joy1->read_pot_y() + 1 / m_joy2->read_pot_y());
		}
		else if (m_joy1->has_pot_y())
		{
			data = m_joy1->read_pot_y();
		}
		else if (m_joy2->has_pot_y())
		{
			data = m_joy2->read_pot_y();
		}
		break;
	}

	return data;
}


//-------------------------------------------------
//  MOS6526_INTERFACE( cia_intf )
//-------------------------------------------------

WRITE_LINE_MEMBER( vic10_state::cia_irq_w )
{
	m_cia_irq = state;

	check_interrupts();
}

READ8_MEMBER( vic10_state::cia_pa_r )
{
	/*

	    bit     description

	    PA0     COL0, JOY B0
	    PA1     COL1, JOY B1
	    PA2     COL2, JOY B2
	    PA3     COL3, JOY B3
	    PA4     COL4, BTNB
	    PA5     COL5
	    PA6     COL6
	    PA7     COL7

	*/

	uint8_t data = 0xff;

	// joystick
	uint8_t joy_b = m_joy2->read_joy();

	data &= (0xf0 | (joy_b & 0x0f));
	data &= ~(!BIT(joy_b, 5) << 4);

	// keyboard
	uint8_t cia_pb = m_cia->read_pb();
	uint32_t row[8] = { m_row[0]->read(), m_row[1]->read() & m_lock->read(), m_row[2]->read(), m_row[3]->read(),
						m_row[4]->read(), m_row[5]->read(), m_row[6]->read(), m_row[7]->read() };

	for (int i = 0; i < 8; i++)
	{
		if (!BIT(cia_pb, i))
		{
			if (!BIT(row[7], i)) data &= ~0x80;
			if (!BIT(row[6], i)) data &= ~0x40;
			if (!BIT(row[5], i)) data &= ~0x20;
			if (!BIT(row[4], i)) data &= ~0x10;
			if (!BIT(row[3], i)) data &= ~0x08;
			if (!BIT(row[2], i)) data &= ~0x04;
			if (!BIT(row[1], i)) data &= ~0x02;
			if (!BIT(row[0], i)) data &= ~0x01;
		}
	}

	return data;
}

READ8_MEMBER( vic10_state::cia_pb_r )
{
	/*

	    bit     description

	    PB0     JOY A0
	    PB1     JOY A1
	    PB2     JOY A2
	    PB3     JOY A3
	    PB4     BTNA/_LP
	    PB5
	    PB6
	    PB7

	*/

	uint8_t data = 0xff;

	// joystick
	uint8_t joy_a = m_joy1->read_joy();

	data &= (0xf0 | (joy_a & 0x0f));
	data &= ~(!BIT(joy_a, 5) << 4);

	// keyboard
	uint8_t cia_pa = m_cia->read_pa();

	if (!BIT(cia_pa, 7)) data &= m_row[7]->read();
	if (!BIT(cia_pa, 6)) data &= m_row[6]->read();
	if (!BIT(cia_pa, 5)) data &= m_row[5]->read();
	if (!BIT(cia_pa, 4)) data &= m_row[4]->read();
	if (!BIT(cia_pa, 3)) data &= m_row[3]->read();
	if (!BIT(cia_pa, 2)) data &= m_row[2]->read();
	if (!BIT(cia_pa, 1)) data &= m_row[1]->read() & m_lock->read();
	if (!BIT(cia_pa, 0)) data &= m_row[0]->read();

	return data;
}

WRITE8_MEMBER( vic10_state::cia_pb_w )
{
	/*

	    bit     description

	    PB0     ROW0
	    PB1     ROW1
	    PB2     ROW2
	    PB3     ROW3
	    PB4     ROW4
	    PB5     ROW5
	    PB6     ROW6
	    PB7     ROW7

	*/

	m_vic->lp_w(BIT(data, 4));
}


//-------------------------------------------------
//  M6510_INTERFACE( cpu_intf )
//-------------------------------------------------

READ8_MEMBER( vic10_state::cpu_r )
{
	/*

	    bit     description

	    P0      EXPANSION PORT
	    P1
	    P2
	    P3
	    P4      CASS SENS
	    P5      0

	*/

	uint8_t data = 0;

	// expansion port
	data |= m_exp->p0_r();

	// cassette sense
	data |= m_cassette->sense_r() << 4;

	return data;
}

WRITE8_MEMBER( vic10_state::cpu_w )
{
	/*

	    bit     description

	    P0      EXPANSION PORT
	    P1
	    P2
	    P3      CASS WRT
	    P4
	    P5      CASS MOTOR

	*/

	if (BIT(offset, 0))
	{
		m_exp->p0_w(BIT(data, 0));
	}

	// cassette write
	m_cassette->write(BIT(data, 3));

	// cassette motor
	m_cassette->motor_w(BIT(data, 5));
}


//-------------------------------------------------
//  VIC10_EXPANSION_INTERFACE( expansion_intf )
//-------------------------------------------------

WRITE_LINE_MEMBER( vic10_state::exp_irq_w )
{
	m_exp_irq = state;

	check_interrupts();
}

WRITE_LINE_MEMBER( vic10_state::exp_reset_w )
{
	if (state == ASSERT_LINE)
	{
		machine_reset();
	}
}



//**************************************************************************
//  MACHINE INITIALIZATION
//**************************************************************************

//-------------------------------------------------
//  MACHINE_START( vic10 )
//-------------------------------------------------

void vic10_state::machine_start()
{
	// allocate memory
	m_color_ram.allocate(0x400);

	// initialize memory
	uint8_t data = 0xff;

	for (offs_t offset = 0; offset < m_ram->size(); offset++)
	{
		m_ram->pointer()[offset] = data;
		if (!(offset % 64)) data ^= 0xff;
	}

	// state saving
	save_item(NAME(m_cia_irq));
	save_item(NAME(m_vic_irq));
	save_item(NAME(m_exp_irq));
}


void vic10_state::machine_reset()
{
	m_maincpu->reset();

	m_vic->reset();
	m_sid->reset();
	m_cia->reset();

	m_exp->reset();
}



//**************************************************************************
//  MACHINE DRIVERS
//**************************************************************************

//-------------------------------------------------
//  MACHINE_CONFIG( vic10 )
//-------------------------------------------------

MACHINE_CONFIG_START(vic10_state::vic10)
	// basic hardware
	MCFG_DEVICE_ADD(M6510_TAG, M6510, XTAL(8'000'000)/8)
	MCFG_DEVICE_PROGRAM_MAP(vic10_mem)
	MCFG_M6502_DISABLE_CACHE() // address decoding is 100% dynamic, no RAM/ROM banks
	MCFG_M6510_PORT_CALLBACKS(READ8(*this, vic10_state, cpu_r), WRITE8(*this, vic10_state, cpu_w))
	MCFG_M6510_PORT_PULLS(0x10, 0x20)
	MCFG_QUANTUM_PERFECT_CPU(M6510_TAG)

	// video hardware
	MCFG_DEVICE_ADD(MOS6566_TAG, MOS6566, XTAL(8'000'000)/8)
	MCFG_MOS6566_CPU(M6510_TAG)
	MCFG_MOS6566_IRQ_CALLBACK(WRITELINE(*this, vic10_state, vic_irq_w))
	MCFG_VIDEO_SET_SCREEN(SCREEN_TAG)
	MCFG_DEVICE_ADDRESS_MAP(0, vic_videoram_map)
	MCFG_DEVICE_ADDRESS_MAP(1, vic_colorram_map)
	MCFG_SCREEN_ADD(SCREEN_TAG, RASTER)
	MCFG_SCREEN_REFRESH_RATE(VIC6566_VRETRACERATE)
	MCFG_SCREEN_SIZE(VIC6567_COLUMNS, VIC6567_LINES)
	MCFG_SCREEN_VISIBLE_AREA(0, VIC6567_VISIBLECOLUMNS - 1, 0, VIC6567_VISIBLELINES - 1)
	MCFG_SCREEN_UPDATE_DEVICE(MOS6566_TAG, mos6566_device, screen_update)

	// sound hardware
	SPEAKER(config, "mono").front_center();
	MCFG_DEVICE_ADD(MOS6581_TAG, MOS6581, XTAL(8'000'000)/8)
	MCFG_MOS6581_POTX_CALLBACK(READ8(*this, vic10_state, sid_potx_r))
	MCFG_MOS6581_POTY_CALLBACK(READ8(*this, vic10_state, sid_poty_r))
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)

	// devices
	MCFG_DEVICE_ADD(MOS6526_TAG, MOS6526, XTAL(8'000'000)/8)
	MCFG_MOS6526_TOD(60)
	MCFG_MOS6526_IRQ_CALLBACK(WRITELINE(*this, vic10_state, cia_irq_w))
	MCFG_MOS6526_CNT_CALLBACK(WRITELINE(VIC10_EXPANSION_SLOT_TAG, vic10_expansion_slot_device, cnt_w))
	MCFG_MOS6526_SP_CALLBACK(WRITELINE(VIC10_EXPANSION_SLOT_TAG, vic10_expansion_slot_device, sp_w))
	MCFG_MOS6526_PA_INPUT_CALLBACK(READ8(*this, vic10_state, cia_pa_r))
	MCFG_MOS6526_PB_INPUT_CALLBACK(READ8(*this, vic10_state, cia_pb_r))
	MCFG_MOS6526_PB_OUTPUT_CALLBACK(WRITE8(*this, vic10_state, cia_pb_w))
	MCFG_PET_DATASSETTE_PORT_ADD(PET_DATASSETTE_PORT_TAG, cbm_datassette_devices, "c1530", WRITELINE(MOS6526_TAG, mos6526_device, flag_w))
	MCFG_VCS_CONTROL_PORT_ADD(CONTROL1_TAG, vcs_control_port_devices, nullptr)
	MCFG_VCS_CONTROL_PORT_TRIGGER_CALLBACK(WRITELINE(MOS6566_TAG, mos6566_device, lp_w))
	MCFG_VCS_CONTROL_PORT_ADD(CONTROL2_TAG, vcs_control_port_devices, "joy")
	MCFG_DEVICE_ADD(VIC10_EXPANSION_SLOT_TAG, VIC10_EXPANSION_SLOT, XTAL(8'000'000)/8, vic10_expansion_cards, nullptr)
	MCFG_VIC10_EXPANSION_SLOT_IRQ_CALLBACK(WRITELINE(*this, vic10_state, exp_irq_w))
	MCFG_VIC10_EXPANSION_SLOT_RES_CALLBACK(WRITELINE(*this, vic10_state, exp_reset_w))
	MCFG_VIC10_EXPANSION_SLOT_CNT_CALLBACK(WRITELINE(MOS6526_TAG, mos6526_device, cnt_w))
	MCFG_VIC10_EXPANSION_SLOT_SP_CALLBACK(WRITELINE(MOS6526_TAG, mos6526_device, sp_w))

	// software list
	MCFG_SOFTWARE_LIST_ADD("cart_list", "vic10")

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("4K")
MACHINE_CONFIG_END



//**************************************************************************
//  ROM DEFINITIONS
//**************************************************************************

ROM_START( vic10 )
	ROM_REGION( 0x100, "pla", 0 )
	ROM_LOAD( "6703.u4", 0x000, 0x100, NO_DUMP )
ROM_END



//**************************************************************************
//  GAME DRIVERS
//**************************************************************************

COMP( 1982, vic10, 0, 0, vic10, vic10, vic10_state, empty_init, "Commodore Business Machines", "VIC-10 / Max Machine / UltiMax (NTSC)", MACHINE_SUPPORTS_SAVE )