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path: root/src/mame/drivers/jupace.cpp
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// license:BSD-3-Clause
// copyright-holders:Curt Coder, Robbbert
/***************************************************************************
Jupiter Ace memory map

    CPU: Z80
        0000-1fff ROM
        2000-23ff Mirror of 2400-27FF
        2400-27ff RAM (1K RAM used for screen and edit/cassette buffer)
        2800-2bff Mirror of 2C00-2FFF
        2c00-2fff RAM (1K RAM for char set, write only)
        3000-3bff Mirror of 3C00-3FFF
        3c00-3fff RAM (1K RAM standard)
        4000-7fff RAM (16K Expansion)
        8000-ffff RAM (48K Expansion)

Interrupts:

    IRQ:
        50Hz vertical sync

Ports:

    Out 0xfe:
        Tape and buzzer

    In 0xfe:
        Keyboard input, tape, and buzzer

    http://www.jupiter-ace.co.uk/

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

/*

    TODO:

    - Ace Colour Board
    - 96K ram expansion
    - Deep Thought disc interface (6850, 6821)

*/


#include "emu.h"
#include "cpu/z80/z80.h"
#include "imagedev/cassette.h"
#include "imagedev/snapquik.h"
#include "bus/centronics/ctronics.h"
#include "machine/i8255.h"
#include "machine/ram.h"
#include "machine/timer.h"
#include "machine/z80pio.h"
#include "sound/ay8910.h"
#include "sound/sp0256.h"
#include "sound/spkrdev.h"
#include "sound/wave.h"

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

#include "formats/ace_tap.h"


#define Z80_TAG         "z0"
#define AY8910_TAG      "ay8910"
#define I8255_TAG       "i8255"
#define SP0256AL2_TAG   "ic1"
#define Z80PIO_TAG      "z80pio"
#define CENTRONICS_TAG  "centronics"
#define SCREEN_TAG      "screen"

class ace_state : public driver_device
{
public:
	ace_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
			m_maincpu(*this, Z80_TAG),
			m_ppi(*this, I8255_TAG),
			m_z80pio(*this, Z80PIO_TAG),
			m_speaker(*this, "speaker"),
			m_cassette(*this, "cassette"),
			m_centronics(*this, CENTRONICS_TAG),
			m_ram(*this, RAM_TAG),
			m_sp0256(*this, SP0256AL2_TAG),
			m_video_ram(*this, "video_ram"),
			m_char_ram(*this, "char_ram"),
			m_a8(*this, "A8"),
			m_a9(*this, "A9"),
			m_a10(*this, "A10"),
			m_a11(*this, "A11"),
			m_a12(*this, "A12"),
			m_a13(*this, "A13"),
			m_a14(*this, "A14"),
			m_a15(*this, "A15"),
			m_joy(*this, "JOY")
	{ }

	virtual void machine_start() override;

	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	DECLARE_READ8_MEMBER( io_r );
	DECLARE_WRITE8_MEMBER( io_w );
	DECLARE_READ8_MEMBER( ppi_pa_r );
	DECLARE_WRITE8_MEMBER( ppi_pa_w );
	DECLARE_READ8_MEMBER( ppi_pb_r );
	DECLARE_WRITE8_MEMBER( ppi_pb_w );
	DECLARE_READ8_MEMBER( ppi_pc_r );
	DECLARE_WRITE8_MEMBER( ppi_pc_w );
	DECLARE_READ8_MEMBER( ppi_control_r );
	DECLARE_WRITE8_MEMBER( ppi_control_w );
	DECLARE_READ8_MEMBER( pio_pa_r );
	DECLARE_WRITE8_MEMBER( pio_pa_w );

	TIMER_DEVICE_CALLBACK_MEMBER(set_irq);
	TIMER_DEVICE_CALLBACK_MEMBER(clear_irq);
	DECLARE_READ8_MEMBER(pio_ad_r);
	DECLARE_READ8_MEMBER(pio_bd_r);
	DECLARE_READ8_MEMBER(pio_ac_r);
	DECLARE_READ8_MEMBER(pio_bc_r);
	DECLARE_WRITE8_MEMBER(pio_ad_w);
	DECLARE_WRITE8_MEMBER(pio_bd_w);
	DECLARE_WRITE8_MEMBER(pio_ac_w);
	DECLARE_WRITE8_MEMBER(pio_bc_w);
	DECLARE_READ8_MEMBER(sby_r);
	DECLARE_WRITE8_MEMBER(ald_w);
	DECLARE_SNAPSHOT_LOAD_MEMBER( ace );

	void ace(machine_config &config);
	void ace_io(address_map &map);
	void ace_mem(address_map &map);
private:
	required_device<cpu_device> m_maincpu;
	required_device<i8255_device> m_ppi;
	required_device<z80pio_device> m_z80pio;
	required_device<speaker_sound_device> m_speaker;
	required_device<cassette_image_device> m_cassette;
	required_device<centronics_device> m_centronics;
	required_device<ram_device> m_ram;
	required_device<sp0256_device> m_sp0256;
	required_shared_ptr<uint8_t> m_video_ram;
	required_shared_ptr<uint8_t> m_char_ram;
	required_ioport m_a8;
	required_ioport m_a9;
	required_ioport m_a10;
	required_ioport m_a11;
	required_ioport m_a12;
	required_ioport m_a13;
	required_ioport m_a14;
	required_ioport m_a15;
	required_ioport m_joy;
};


/* Load in .ace files. These are memory images of 0x2000 to 0x7fff
   and compressed as follows:

   ED 00        : End marker
   ED <cnt> <byt>   : repeat <byt> count <cnt:1-240> times
   <byt>        : <byt>
*/

/******************************************************************************
 Snapshot Handling
******************************************************************************/

SNAPSHOT_LOAD_MEMBER( ace_state, ace )
{
	cpu_device *cpu = m_maincpu;
	uint8_t *RAM = memregion(cpu->tag())->base();
	address_space &space = cpu->space(AS_PROGRAM);
	unsigned char ace_repeat, ace_byte, loop;
	int done=0, ace_index=0x2000;

	if (m_ram->size() < 16*1024)
	{
		image.seterror(IMAGE_ERROR_INVALIDIMAGE, "At least 16KB RAM expansion required");
		image.message("At least 16KB RAM expansion required");
		return image_init_result::FAIL;
	}

	logerror("Loading file %s.\r\n", image.filename());
	while (!done && (ace_index < 0x8001))
	{
		image.fread( &ace_byte, 1);
		if (ace_byte == 0xed)
		{
			image.fread(&ace_byte, 1);
			switch (ace_byte)
			{
			case 0x00:
					logerror("File loaded!\r\n");
					done = 1;
					break;
			case 0x01:
					image.fread(&ace_byte, 1);
					RAM[ace_index++] = ace_byte;
					break;
			default:
					image.fread(&ace_repeat, 1);
					for (loop = 0; loop < ace_byte; loop++)
						RAM[ace_index++] = ace_repeat;
					break;
			}
		}
		else
			RAM[ace_index++] = ace_byte;
	}

	logerror("Decoded %X bytes.\r\n", ace_index-0x2000);

	if (!done)
	{
		image.seterror(IMAGE_ERROR_INVALIDIMAGE, "EOF marker not found");
		image.message("EOF marker not found");
		return image_init_result::FAIL;
	}

		// patch CPU registers
		// Some games do not follow the standard, and have rubbish in the CPU area. So,
		// we check that some other bytes are correct.
		// 2080 = memory size of original machine, should be 0000 or 8000 or C000.
		// 2118 = new stack pointer, do not use if between 8000 and FF00.

	ace_index = RAM[0x2080] | (RAM[0x2081] << 8);

	if ((ace_index & 0x3FFF)==0)
	{
		cpu->set_state_int(Z80_AF, RAM[0x2100] | (RAM[0x2101] << 8));
		cpu->set_state_int(Z80_BC, RAM[0x2104] | (RAM[0x2105] << 8));
		cpu->set_state_int(Z80_DE, RAM[0x2108] | (RAM[0x2109] << 8));
		cpu->set_state_int(Z80_HL, RAM[0x210c] | (RAM[0x210d] << 8));
		cpu->set_state_int(Z80_IX, RAM[0x2110] | (RAM[0x2111] << 8));
		cpu->set_state_int(Z80_IY, RAM[0x2114] | (RAM[0x2115] << 8));
		cpu->set_pc(RAM[0x211c] | (RAM[0x211d] << 8));
		cpu->set_state_int(Z80_AF2, RAM[0x2120] | (RAM[0x2121] << 8));
		cpu->set_state_int(Z80_BC2, RAM[0x2124] | (RAM[0x2125] << 8));
		cpu->set_state_int(Z80_DE2, RAM[0x2128] | (RAM[0x2129] << 8));
		cpu->set_state_int(Z80_HL2, RAM[0x212c] | (RAM[0x212d] << 8));
		cpu->set_state_int(Z80_IM, RAM[0x2130]);
		cpu->set_state_int(Z80_IFF1, RAM[0x2134]);
		cpu->set_state_int(Z80_IFF2, RAM[0x2138]);
		cpu->set_state_int(Z80_I, RAM[0x213c]);
		cpu->set_state_int(Z80_R, RAM[0x2140]);

		if ((RAM[0x2119] < 0x80) || !ace_index)
			cpu->set_state_int(STATE_GENSP, RAM[0x2118] | (RAM[0x2119] << 8));
	}

	/* Copy data to the address space */
	for (ace_index = 0x2000; ace_index < 0x8000; ace_index++)
		space.write_byte(ace_index, RAM[ace_index]);

	return image_init_result::PASS;
}

//**************************************************************************
//  READ/WRITE HANDLERS
//**************************************************************************

//-------------------------------------------------
//   io_r -
//-------------------------------------------------

READ8_MEMBER( ace_state::io_r )
{
	uint8_t data = 0xff;

	if (!BIT(offset, 8)) data &= m_a8->read();
	if (!BIT(offset, 9)) data &= m_a9->read();
	if (!BIT(offset, 10)) data &= m_a10->read();
	if (!BIT(offset, 11)) data &= m_a11->read();
	if (!BIT(offset, 12)) data &= m_a12->read();
	if (!BIT(offset, 13)) data &= m_a13->read();
	if (!BIT(offset, 14)) data &= m_a14->read();

	if (!BIT(offset, 15))
	{
		data &= m_a15->read();

		m_cassette->output(-1);
		m_speaker->level_w(0);
	}

	if (m_cassette->input() > 0)
	{
		data &= ~0x20;
	}

	return data;
}


//-------------------------------------------------
//   io_w -
//-------------------------------------------------

WRITE8_MEMBER( ace_state::io_w )
{
	m_cassette->output(1);
	m_speaker->level_w(1);
}


//-------------------------------------------------
//   ppi_r -
//-------------------------------------------------

READ8_MEMBER( ace_state::ppi_pa_r )
{
	return m_ppi->read(space, 0);
}

READ8_MEMBER( ace_state::ppi_pb_r )
{
	return m_ppi->read(space, 1);
}

READ8_MEMBER( ace_state::ppi_pc_r )
{
	return m_ppi->read(space, 2);
}

READ8_MEMBER( ace_state::ppi_control_r )
{
	return m_ppi->read(space, 3);
}


//-------------------------------------------------
//   ppi_w -
//-------------------------------------------------

WRITE8_MEMBER( ace_state::ppi_pa_w )
{
	m_ppi->write(space, 0, data);
}

WRITE8_MEMBER( ace_state::ppi_pb_w )
{
	m_ppi->write(space, 1, data);
}

WRITE8_MEMBER( ace_state::ppi_pc_w )
{
	m_ppi->write(space, 2, data);
}

WRITE8_MEMBER( ace_state::ppi_control_w )
{
	m_ppi->write(space, 3, data);
}


//-------------------------------------------------
//   pio_r -
//-------------------------------------------------

READ8_MEMBER(ace_state::pio_ad_r)
{
	return m_z80pio->data_read(0);
}

READ8_MEMBER(ace_state::pio_bd_r)
{
	return m_z80pio->data_read(1);
}

READ8_MEMBER(ace_state::pio_ac_r)
{
	return m_z80pio->control_read();
}

READ8_MEMBER(ace_state::pio_bc_r)
{
	return m_z80pio->control_read();
}


//-------------------------------------------------
//   pio_w -
//-------------------------------------------------

WRITE8_MEMBER(ace_state::pio_ad_w)
{
	m_z80pio->data_write(0, data);
}

WRITE8_MEMBER(ace_state::pio_bd_w)
{
	m_z80pio->data_write(1, data);
}

WRITE8_MEMBER(ace_state::pio_ac_w)
{
	m_z80pio->control_write(0, data);
}

WRITE8_MEMBER(ace_state::pio_bc_w)
{
	m_z80pio->control_write(1, data);
}



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

//-------------------------------------------------
//  ADDRESS_MAP( ace_mem )
//-------------------------------------------------

void ace_state::ace_mem(address_map &map)
{
	map(0x0000, 0x1fff).rom();
	map(0x2000, 0x23ff).mirror(0x0400).ram().share("video_ram");
	map(0x2800, 0x2bff).mirror(0x0400).ram().share("char_ram").region(Z80_TAG, 0xfc00);
	map(0x3000, 0x33ff).mirror(0x0c00).ram();
	map(0x4000, 0xffff).ram();
}


//-------------------------------------------------
//  ADDRESS_MAP( ace_io )
//-------------------------------------------------

void ace_state::ace_io(address_map &map)
{
	map(0x00, 0x00).mirror(0x00fe).select(0xff00).rw(this, FUNC(ace_state::io_r), FUNC(ace_state::io_w));
	map(0x01, 0x01).mirror(0xff00).portr("JOY");
	map(0x41, 0x41).mirror(0xff80).rw(this, FUNC(ace_state::ppi_pa_r), FUNC(ace_state::ppi_pa_w));
	map(0x43, 0x43).mirror(0xff80).rw(this, FUNC(ace_state::ppi_pb_r), FUNC(ace_state::ppi_pb_w));
	map(0x45, 0x45).mirror(0xff80).rw(this, FUNC(ace_state::ppi_pc_r), FUNC(ace_state::ppi_pc_w));
	map(0x47, 0x47).mirror(0xff80).rw(this, FUNC(ace_state::ppi_control_r), FUNC(ace_state::ppi_control_w));
	map(0x81, 0x81).mirror(0xff38).rw(this, FUNC(ace_state::pio_ad_r), FUNC(ace_state::pio_ad_w));
	map(0x83, 0x83).mirror(0xff38).rw(this, FUNC(ace_state::pio_bd_r), FUNC(ace_state::pio_bd_w));
	map(0x85, 0x85).mirror(0xff38).rw(this, FUNC(ace_state::pio_ac_r), FUNC(ace_state::pio_ac_w));
	map(0x87, 0x87).mirror(0xff38).rw(this, FUNC(ace_state::pio_bc_r), FUNC(ace_state::pio_bc_w));
	map(0xfd, 0xfd).mirror(0xff00).w(AY8910_TAG, FUNC(ay8910_device::address_w));
	map(0xff, 0xff).mirror(0xff00).rw(AY8910_TAG, FUNC(ay8910_device::data_r), FUNC(ay8910_device::data_w));
}



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

//-------------------------------------------------
//  INPUT_PORTS( ace )
//-------------------------------------------------

static INPUT_PORTS_START( ace )
	PORT_START("A8")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_RSHIFT)     PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Symbol Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z)          PORT_CHAR('z') PORT_CHAR('Z') PORT_CHAR(':')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X)          PORT_CHAR('x') PORT_CHAR('X') PORT_CHAR(0xA3)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C)          PORT_CHAR('c') PORT_CHAR('C') PORT_CHAR('?')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A9")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A)          PORT_CHAR('a') PORT_CHAR('A') PORT_CHAR('~')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S)          PORT_CHAR('s') PORT_CHAR('S') PORT_CHAR('|')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D)          PORT_CHAR('d') PORT_CHAR('D') PORT_CHAR('\\')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F)          PORT_CHAR('f') PORT_CHAR('F') PORT_CHAR('{')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G)          PORT_CHAR('g') PORT_CHAR('G') PORT_CHAR('}')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A10")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q)          PORT_CHAR('q') PORT_CHAR('Q')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W)          PORT_CHAR('w') PORT_CHAR('W')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E)          PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R)          PORT_CHAR('r') PORT_CHAR('R') PORT_CHAR('<')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_T)          PORT_CHAR('t') PORT_CHAR('T') PORT_CHAR('>')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A11")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1)          PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT( 0x02, 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_3)          PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4)          PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_LEFT) PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A12")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)          PORT_CHAR('0') PORT_CHAR('_')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9)          PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_RIGHT) PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_DOWN) PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_UP)    PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A13")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_P)          PORT_CHAR('p') PORT_CHAR('P') PORT_CHAR('"')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_O)          PORT_CHAR('o') PORT_CHAR('O') PORT_CHAR(';')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I)          PORT_CHAR('i') PORT_CHAR('I') PORT_CHAR(0x00A9)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U)          PORT_CHAR('u') PORT_CHAR('U') PORT_CHAR(']')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Y)          PORT_CHAR('y') PORT_CHAR('Y') PORT_CHAR('[')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A14")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_ENTER)      PORT_CHAR(13)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L)          PORT_CHAR('l') PORT_CHAR('L') PORT_CHAR('=')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K)          PORT_CHAR('k') PORT_CHAR('K') PORT_CHAR('+')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J)          PORT_CHAR('j') PORT_CHAR('J') PORT_CHAR('-')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("h  H  \xE2\x86\x91") PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("A15")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SPACE)      PORT_CHAR(' ')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M)          PORT_CHAR('m') PORT_CHAR('M') PORT_CHAR('.')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N)          PORT_CHAR('n') PORT_CHAR('N') PORT_CHAR(',')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B)          PORT_CHAR('b') PORT_CHAR('B') PORT_CHAR('*')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V)          PORT_CHAR('v') PORT_CHAR('V') PORT_CHAR('/')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("JOY")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON1 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED )
INPUT_PORTS_END



//**************************************************************************
//  VIDEO
//**************************************************************************

//-------------------------------------------------
//  gfx_layout ace_charlayout
//-------------------------------------------------

static const gfx_layout ace_charlayout =
{
	8,8,
	128,
	1,
	{ RGN_FRAC(0,1) },
	{ STEP8(0,1) },
	{ STEP8(0,8) },
	8*8
};


//-------------------------------------------------
//  GFXDECODE( ace )
//-------------------------------------------------

static GFXDECODE_START( gfx_ace )
	GFXDECODE_ENTRY( Z80_TAG, 0xfc00, ace_charlayout, 0, 1 )
GFXDECODE_END


//-------------------------------------------------
//  TIMER_DEVICE_CALLBACK_MEMBER( set_irq )
//-------------------------------------------------

TIMER_DEVICE_CALLBACK_MEMBER(ace_state::set_irq)
{
	m_maincpu->set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);
}


//-------------------------------------------------
//  TIMER_DEVICE_CALLBACK_MEMBER( clear_irq )
//-------------------------------------------------

TIMER_DEVICE_CALLBACK_MEMBER(ace_state::clear_irq)
{
	m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
}


uint32_t ace_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	uint8_t y,ra,chr,gfx;
	uint16_t sy=56,ma=0,x;

	for (y = 0; y < 24; y++)
	{
		for (ra = 0; ra < 8; ra++)
		{
			uint16_t *p = &bitmap.pix16(sy++, 40);

			for (x = ma; x < ma+32; x++)
			{
				chr = m_video_ram[x];

				/* get pattern of pixels for that character scanline */
				gfx = m_char_ram[((chr&0x7f)<<3) | ra] ^ (BIT(chr, 7) ? 0xff : 0);

				/* Display a scanline of a character (8 pixels) */
				*p++ = BIT(gfx, 7);
				*p++ = BIT(gfx, 6);
				*p++ = BIT(gfx, 5);
				*p++ = BIT(gfx, 4);
				*p++ = BIT(gfx, 3);
				*p++ = BIT(gfx, 2);
				*p++ = BIT(gfx, 1);
				*p++ = BIT(gfx, 0);
			}
		}
		ma+=32;
	}
	return 0;
}



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

//-------------------------------------------------
//  I8255A interface
//-------------------------------------------------

READ8_MEMBER(ace_state::sby_r)
{
	/*

	    bit     description

	    PC0     SP0256 SBY
	    PC1
	    PC2
	    PC3
	    PC4
	    PC5
	    PC6
	    PC7

	*/

	return m_sp0256->sby_r();
}

WRITE8_MEMBER(ace_state::ald_w)
{
	/*

	    bit     description

	    PA0     SP0256 A1
	    PA1     SP0256 A2
	    PA2     SP0256 A3
	    PA3     SP0256 A4
	    PA4     SP0256 A5
	    PA5     SP0256 A6
	    PA6     SP0256 _ALD
	    PA7

	*/

	if (!BIT(data, 6))
	{
		m_sp0256->ald_w(space, 0, data & 0x3f);
	}
}

//-------------------------------------------------
//  Z80PIO
//-------------------------------------------------

READ8_MEMBER( ace_state::pio_pa_r )
{
	/*

	    bit     description

	    PA0
	    PA1     RxD
	    PA2
	    PA3
	    PA4
	    PA5
	    PA6
	    PA7

	*/

	return 0;
}

WRITE8_MEMBER( ace_state::pio_pa_w )
{
	/*

	    bit     description

	    PA0     RTS
	    PA1
	    PA2     CTS
	    PA3     TxD
	    PA4
	    PA5
	    PA6     STB
	    PA7

	*/

	// centronics strobe
	m_centronics->write_strobe(!BIT(data, 6));
}

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

//-------------------------------------------------
//  MACHINE_START( ace )
//-------------------------------------------------

void ace_state::machine_start()
{
	address_space &program = m_maincpu->space(AS_PROGRAM);

	/* configure RAM */
	switch (m_ram->size())
	{
	case 1*1024:
		program.unmap_readwrite(0x4000, 0xffff);
		break;

	case 16*1024:
		program.unmap_readwrite(0x8000, 0xffff);
		break;

	case 32*1024:
		program.unmap_readwrite(0xc000, 0xffff);
		break;
	}
}



//**************************************************************************
//  MACHINE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  MACHINE_CONFIG( ace )
//-------------------------------------------------

MACHINE_CONFIG_START(ace_state::ace)
	// basic machine hardware
	MCFG_DEVICE_ADD(Z80_TAG, Z80, XTAL(6'500'000)/2)
	MCFG_DEVICE_PROGRAM_MAP(ace_mem)
	MCFG_DEVICE_IO_MAP(ace_io)
	MCFG_QUANTUM_TIME(attotime::from_hz(60))

	// video hardware
	MCFG_SCREEN_ADD(SCREEN_TAG, RASTER)
	MCFG_SCREEN_UPDATE_DRIVER(ace_state, screen_update)
	MCFG_SCREEN_RAW_PARAMS(XTAL(6'500'000), 416, 0, 336, 312, 0, 304)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_TIMER_DRIVER_ADD_SCANLINE("set_irq", ace_state, set_irq, SCREEN_TAG, 31*8, 264)
	MCFG_TIMER_DRIVER_ADD_SCANLINE("clear_irq", ace_state, clear_irq, SCREEN_TAG, 32*8, 264)

	MCFG_PALETTE_ADD_MONOCHROME("palette")

	MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_ace)

	// sound hardware
	SPEAKER(config, "mono").front_center();
	WAVE(config, "wave", "cassette").add_route(ALL_OUTPUTS, "mono", 0.25);
	SPEAKER_SOUND(config, "speaker").add_route(ALL_OUTPUTS, "mono", 1.00);

	MCFG_DEVICE_ADD(AY8910_TAG, AY8910, XTAL(6'500'000)/2)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	MCFG_DEVICE_ADD(SP0256AL2_TAG, SP0256, XTAL(3'000'000))
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	// devices
	MCFG_CASSETTE_ADD("cassette")
	MCFG_CASSETTE_FORMATS(ace_cassette_formats)
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED)
	MCFG_CASSETTE_INTERFACE("jupace_cass")

	MCFG_SNAPSHOT_ADD("snapshot", ace_state, ace, "ace", 1)

	MCFG_DEVICE_ADD(I8255_TAG, I8255A, 0)
	MCFG_I8255_IN_PORTB_CB(READ8(*this, ace_state, sby_r))
	MCFG_I8255_OUT_PORTB_CB(WRITE8(*this, ace_state, ald_w))

	MCFG_DEVICE_ADD(Z80PIO_TAG, Z80PIO, XTAL(6'500'000)/2)
	MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80PIO_IN_PA_CB(READ8(*this, ace_state, pio_pa_r))
	MCFG_Z80PIO_OUT_PA_CB(WRITE8(*this, ace_state, pio_pa_w))
	MCFG_Z80PIO_OUT_PB_CB(WRITE8("cent_data_out", output_latch_device, write))

	MCFG_CENTRONICS_ADD(CENTRONICS_TAG, centronics_devices, "printer")
	MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", CENTRONICS_TAG)

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("1K")
	MCFG_RAM_EXTRA_OPTIONS("16K,32K,48K")

	MCFG_SOFTWARE_LIST_ADD("cass_list", "jupace_cass")
MACHINE_CONFIG_END



//**************************************************************************
//  ROMS
//**************************************************************************

//-------------------------------------------------
//  ROM( ace )
//-------------------------------------------------

ROM_START( jupace )
	ROM_REGION( 0x10000, Z80_TAG, 0 )
	ROM_LOAD( "rom-a.z1", 0x0000, 0x1000, CRC(dc8438a5) SHA1(8fa97eb71e5dd17c7d190c6587ee3840f839347c) )
	ROM_LOAD( "rom-b.z2", 0x1000, 0x1000, CRC(4009f636) SHA1(98c5d4bcd74bcf014268cf4c00b2007ea5cc21f3) )

	ROM_REGION( 0x1000, "fdc", 0 ) // Deep Thought disc interface
	ROM_LOAD( "dos 4.bin", 0x0000, 0x1000, CRC(04c70448) SHA1(53ddcced6ae2feafd687a3b55864726656b71412) )

	ROM_REGION( 0x10000, SP0256AL2_TAG, 0 )
	ROM_LOAD( "sp0256-al2.ic1", 0x000, 0x800, CRC(b504ac15) SHA1(e60fcb5fa16ff3f3b69d36c7a6e955744d3feafc) )
ROM_END



//**************************************************************************
//  SYSTEM DRIVERS
//**************************************************************************

//    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT  CLASS      INIT        COMPANY           FULLNAME       FLAGS
COMP( 1981, jupace, 0,      0,      ace,     ace,   ace_state, empty_init, "Jupiter Cantab", "Jupiter Ace", 0 )