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path: root/src/mame/drivers/hektor.cpp
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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    Open University Hektor

    Hektor III usage notes:
    - t  - system test
    - a1 - audio test (plays The Entertainer)
    - a3 - graphic test
    - ay - run analyser software in ROM1
    - az - run analyser software in ROM2

    TODO:
    - Dump Hektor II ROMs, maybe 2 or 3 versions.
    - Emulate Expansion Bus and Peripheral Boards.

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


#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8155.h"
#include "machine/i8255.h"
#include "machine/ram.h"
#include "sound/spkrdev.h"
#include "video/ef9364.h"
#include "video/mc6845.h"
#include "imagedev/cassette.h"
#include "bus/rs232/rs232.h"
#include "speaker.h"
#include "emupal.h"
#include "screen.h"


class hektor_state : public driver_device
{
public:
	hektor_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_maincpu_region(*this, "maincpu")
		, m_i8155(*this, "i8155")
		, m_kbd(*this, "KEY%u", 0)
		, m_screen(*this, "screen")
		, m_palette(*this, "palette")
		, m_speaker(*this, "speaker")
		, m_cassette(*this, "cassette")
		, m_rs232(*this, "rs232")
	{ }

	DECLARE_WRITE8_MEMBER(i8155_porta_w);
	DECLARE_READ8_MEMBER(i8155_portb_r);
	DECLARE_READ_LINE_MEMBER(sid_r);
	DECLARE_WRITE_LINE_MEMBER(sod_w);

	DECLARE_INPUT_CHANGED_MEMBER(trigger_reset);
	DECLARE_INPUT_CHANGED_MEMBER(trigger_rst65);

protected:
	required_device<i8085a_cpu_device> m_maincpu;
	required_memory_region m_maincpu_region;
	required_device<i8155_device> m_i8155;
	required_ioport_array<8> m_kbd;
	required_device<screen_device> m_screen;
	required_device<palette_device> m_palette;
	required_device<speaker_sound_device> m_speaker;
	required_device<cassette_image_device> m_cassette;
	required_device<rs232_port_device> m_rs232;

	uint8_t m_kbd_row;
	uint8_t m_i8155_portc;

private:
	virtual void machine_start() override;
	virtual void machine_reset() override;
};


class hektor2_state : public hektor_state
{
public:
	hektor2_state(const machine_config &mconfig, device_type type, const char *tag)
		: hektor_state(mconfig, type, tag)
		, m_ef9364(*this, "ef9364")
	{ }

	void hektor2(machine_config &config);

private:
	void hektor2_mem(address_map &map);

	DECLARE_WRITE8_MEMBER(i8155_portc_w);

	required_device<ef9364_device> m_ef9364;
};


class hektor3_state : public hektor_state
{
public:
	hektor3_state(const machine_config &mconfig, device_type type, const char *tag)
		: hektor_state(mconfig, type, tag)
		, m_ram(*this, "ram")
		, m_hd6845(*this, "hd6845")
		, m_i8255(*this, "i8255")
	{ }

	void hektor3(machine_config &config);

private:
	void hektor3_mem(address_map &map);
	void hektor3_io(address_map &map);

	uint8_t mem_r(offs_t offset);
	void mem_w(offs_t offset, uint8_t data);

	DECLARE_WRITE8_MEMBER(i8155_portc_w);
	MC6845_UPDATE_ROW(crtc_update_row);

	required_device<ram_device> m_ram;
	required_device<hd6845s_device> m_hd6845;
	required_device<i8255_device> m_i8255;
};


WRITE8_MEMBER(hektor_state::i8155_porta_w)
{
	m_kbd_row = data;
}

READ8_MEMBER(hektor_state::i8155_portb_r)
{
	for (int col = 0; col < 8; col++)
	{
		if (!BIT(m_kbd_row, col)) return m_kbd[col]->read();
	}

	return 0xff;
}

WRITE8_MEMBER(hektor2_state::i8155_portc_w)
{
	m_i8155_portc = data;

	/* bit 0: EF9364 strobe ST */
	/* bit 1: EF9364 command C0 */
	/* bit 2: EF9364 command C1 */
	/* bit 3: EF9364 command C2 */
	m_ef9364->command_w((data & 0x1f) >> 1);

	/* bit 5: cassette motor */
	m_cassette->change_state(BIT(data, 5) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);

	/* bit 6: audio out */
	m_speaker->level_w(BIT(data, 6)); // TODO: verify which bit
}

WRITE8_MEMBER(hektor3_state::i8155_portc_w)
{
	m_i8155_portc = data;

	/* bit 2: audio out */
	m_speaker->level_w(BIT(data, 2));

	/* bit 3: cassette motor */
	m_cassette->change_state(BIT(data, 3) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);

	/* bit 5: ROM enable */
}


READ_LINE_MEMBER(hektor_state::sid_r)
{
	if (BIT(m_i8155_portc, 3))
		return (m_cassette->input() < 0.03);
	else
		return m_rs232->rxd_r();
}

WRITE_LINE_MEMBER(hektor_state::sod_w)
{
	if (BIT(m_i8155_portc, 3))
		m_cassette->output(state ? -1.0 : +1.0);
	else
		m_rs232->write_txd(state);
}


uint8_t hektor3_state::mem_r(offs_t offset)
{
	uint8_t data;

	if (BIT(m_i8155_portc, 5))
		data = m_maincpu_region->base()[offset];
	else
		data = m_ram->pointer()[offset];

	return data;
}

void hektor3_state::mem_w(offs_t offset, uint8_t data)
{
	m_ram->pointer()[offset] = data;
}


MC6845_UPDATE_ROW(hektor3_state::crtc_update_row)
{
	const pen_t *pen = m_palette->pens();

	for (int x = 0; x < x_count; x++)
	{
		uint16_t offset = (ra << 11) | ((ma + x) & 0x7ff);
		uint8_t data = m_ram->pointer()[~offset & 0xffff];
		if (x == cursor_x) data ^= 0xff;

		bitmap.pix32(y, x * 8 + 0) = pen[BIT(data, 7)];
		bitmap.pix32(y, x * 8 + 1) = pen[BIT(data, 6)];
		bitmap.pix32(y, x * 8 + 2) = pen[BIT(data, 5)];
		bitmap.pix32(y, x * 8 + 3) = pen[BIT(data, 4)];
		bitmap.pix32(y, x * 8 + 4) = pen[BIT(data, 3)];
		bitmap.pix32(y, x * 8 + 5) = pen[BIT(data, 2)];
		bitmap.pix32(y, x * 8 + 6) = pen[BIT(data, 1)];
		bitmap.pix32(y, x * 8 + 7) = pen[BIT(data, 0)];
	}
}


void hektor2_state::hektor2_mem(address_map &map)
{
	map(0x0000, 0x0fff).mirror(0x8000).rom();
	map(0x1000, 0x1fff).mirror(0x8000).rom();
	map(0x2000, 0x23ff).mirror(0x8000).w(m_ef9364, FUNC(ef9364_device::char_latch_w));
	map(0x2400, 0x27ff).rw("i8155", FUNC(i8155_device::memory_r), FUNC(i8155_device::memory_w));
	map(0x2800, 0x2fff).mirror(0x8000).ram();
	map(0x3000, 0x37ff).mirror(0x8000).ram();
	map(0x3800, 0x3fff).mirror(0x8000).ram();
	map(0x4000, 0x5fff).mirror(0x8000).noprw();
	map(0x6000, 0x6fff).mirror(0x8000).noprw();
	map(0x7000, 0x7fff).mirror(0x8000).rom();
	map(0xa400, 0xa7ff).rw("i8155", FUNC(i8155_device::io_r), FUNC(i8155_device::io_w));
}


void hektor3_state::hektor3_mem(address_map &map)
{
	map(0x0000, 0xffff).rw(FUNC(hektor3_state::mem_r), FUNC(hektor3_state::mem_w));
}

void hektor3_state::hektor3_io(address_map &map)
{
	map(0x00, 0x00).rw(m_hd6845, FUNC(hd6845s_device::status_r), FUNC(hd6845s_device::address_w));
	map(0x01, 0x01).rw(m_hd6845, FUNC(hd6845s_device::register_r), FUNC(hd6845s_device::register_w));
	map(0x08, 0x0f).rw(m_i8155, FUNC(i8155_device::io_r), FUNC(i8155_device::io_w));
	map(0x10, 0x13).rw(m_i8255, FUNC(i8255_device::read), FUNC(i8255_device::write));
}


static INPUT_PORTS_START(hektor2)
	PORT_START("KEY0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_MAMEKEY(LCONTROL))

	PORT_START("KEY1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Shift Lock") PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Up") PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Right") PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Left") PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Home") PORT_CODE(KEYCODE_HOME) PORT_CHAR(UCHAR_MAMEKEY(HOME))
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Down") PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)

	PORT_START("KEY2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("@") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('@')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("/ ?") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(". >") PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(", <") PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')

	PORT_START("KEY3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(": *") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("; +") PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')

	PORT_START("KEY4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')

	PORT_START("KEY5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')

	PORT_START("KEY6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("] }") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(']') PORT_CHAR('}')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("[ {") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("^ ~") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('^') PORT_CHAR('~')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("- =") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9 )") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8 (") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')

	PORT_START("KEY7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7 '") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6 &") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5 %") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4 $") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3 #") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2 \"") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('\"')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1 !") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("RESET")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Reset") PORT_CODE(KEYCODE_ESC) PORT_CHANGED_MEMBER(DEVICE_SELF, hektor_state, trigger_reset, 0)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_TAB) PORT_CHANGED_MEMBER(DEVICE_SELF, hektor_state, trigger_rst65, 0)
INPUT_PORTS_END

INPUT_CHANGED_MEMBER(hektor_state::trigger_reset)
{
	m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? CLEAR_LINE : ASSERT_LINE);
}

INPUT_CHANGED_MEMBER(hektor_state::trigger_rst65)
{
	m_maincpu->set_input_line(I8085_RST65_LINE, newval ? CLEAR_LINE : ASSERT_LINE);
}

static INPUT_PORTS_START(hektor3)
	PORT_INCLUDE(hektor2)

	PORT_MODIFY("KEY1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Caps Lock") PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Left") PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))

	PORT_MODIFY("KEY2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("@ `") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('@') PORT_CHAR('`')

	PORT_MODIFY("KEY6")
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Delete") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0 _") PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR('_')

	PORT_MODIFY("RESET")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Esc") PORT_CODE(KEYCODE_ESC) PORT_CHAR(UCHAR_MAMEKEY(ESC)) PORT_CHANGED_MEMBER(DEVICE_SELF, hektor_state, trigger_reset, 0)
INPUT_PORTS_END


void hektor_state::machine_start()
{
	save_item(NAME(m_kbd_row));
	save_item(NAME(m_i8155_portc));
}

void hektor_state::machine_reset()
{
	m_i8155_portc = 0xff;
}


void hektor2_state::hektor2(machine_config &config)
{
	I8085A(config, m_maincpu, 6.144_MHz_XTAL);  // TODO: verify crystal, manual says 6.048_MHz_XTAL
	m_maincpu->set_addrmap(AS_PROGRAM, &hektor2_state::hektor2_mem);
	m_maincpu->in_sid_func().set(FUNC(hektor_state::sid_r));
	m_maincpu->out_sod_func().set(FUNC(hektor_state::sod_w));
	m_maincpu->set_clk_out("i8155", FUNC(i8155_device::set_unscaled_clock_int));

	I8155(config, m_i8155, 6.144_MHz_XTAL / 2);
	m_i8155->out_pa_callback().set(FUNC(hektor_state::i8155_porta_w));
	m_i8155->in_pb_callback().set(FUNC(hektor_state::i8155_portb_r));
	m_i8155->out_pc_callback().set(FUNC(hektor2_state::i8155_portc_w));
	m_i8155->out_to_callback().set_inputline(m_maincpu, I8085_TRAP_LINE);

	CASSETTE(config, m_cassette);
	m_cassette->set_default_state(CASSETTE_PLAY | CASSETTE_SPEAKER_ENABLED | CASSETTE_MOTOR_DISABLED);
	m_cassette->add_route(ALL_OUTPUTS, "mono", 0.05);

	RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
	m_rs232->cts_handler().set_inputline(m_maincpu, I8085_RST55_LINE);

	SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 1.00);

	SPEAKER(config, "mono").front_center();

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_refresh_hz(50);
	m_screen->set_screen_update("ef9364", FUNC(ef9364_device::screen_update));
	m_screen->set_size(64 * 8, 16 * 8);
	m_screen->set_visarea(0, 64 * 8 - 1, 0, 16 * 8 - 1);

	PALETTE(config, m_palette, palette_device::MONOCHROME);

	EF9364(config, m_ef9364, 6.144_MHz_XTAL / 6);
	m_ef9364->set_palette_tag("palette");
	m_ef9364->set_nb_of_pages(1);
}


void hektor3_state::hektor3(machine_config &config)
{
	I8085A(config, m_maincpu, 16_MHz_XTAL / 2); // TODO: divider guessed
	m_maincpu->set_addrmap(AS_PROGRAM, &hektor3_state::hektor3_mem);
	m_maincpu->set_addrmap(AS_IO, &hektor3_state::hektor3_io);
	m_maincpu->in_sid_func().set(FUNC(hektor_state::sid_r));
	m_maincpu->out_sod_func().set(FUNC(hektor_state::sod_w));
	m_maincpu->set_clk_out("i8155", FUNC(i8155_device::set_unscaled_clock_int));

	I8155(config, m_i8155, 16_MHz_XTAL / 4);
	m_i8155->out_pa_callback().set(FUNC(hektor_state::i8155_porta_w));
	m_i8155->in_pb_callback().set(FUNC(hektor_state::i8155_portb_r));
	m_i8155->out_pc_callback().set(FUNC(hektor3_state::i8155_portc_w));
	m_i8155->out_to_callback().set_inputline(m_maincpu, I8085_TRAP_LINE);

	CASSETTE(config, m_cassette);
	m_cassette->set_default_state(CASSETTE_PLAY | CASSETTE_SPEAKER_ENABLED | CASSETTE_MOTOR_DISABLED);
	m_cassette->add_route(ALL_OUTPUTS, "mono", 0.05);

	RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
	m_rs232->cts_handler().set_inputline(m_maincpu, I8085_RST55_LINE);

	SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 1.00);

	SPEAKER(config, "mono").front_center();

	I8255(config, m_i8255); // I/O Port

	RAM(config, m_ram).set_default_size("64K").set_default_value(0xff);

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_raw(16_MHz_XTAL, 1024, 0, 640, 312, 0, 240);
	m_screen->set_screen_update("hd6845", FUNC(hd6845s_device::screen_update));

	PALETTE(config, m_palette, palette_device::MONOCHROME);

	HD6845S(config, m_hd6845, 16_MHz_XTAL / 8);
	m_hd6845->set_screen(m_screen);
	m_hd6845->set_show_border_area(false);
	m_hd6845->set_char_width(8);
	m_hd6845->set_update_row_callback(FUNC(hektor3_state::crtc_update_row));
}


#ifdef UNUSED_DEFINITION
ROM_START(hektor2)
	ROM_REGION(0x8000, "maincpu", 0)
	ROM_LOAD("hek1a_skt0.rom", 0x0000, 0x1000, NO_DUMP)
	ROM_LOAD("hek1a_skt1.rom", 0x1000, 0x1000, NO_DUMP)
	ROM_LOAD("hek1a_ic5.rom",  0x7000, 0x1000, NO_DUMP)

	ROM_REGION(0x800, "ef9364", 0)
	ROM_LOAD("charset.bin", 0x0000, 0x0800, NO_DUMP)
ROM_END
#endif

ROM_START(hektor3)
	ROM_REGION(0x10000, "maincpu", 0)
	ROM_LOAD("system.rom0",   0x0000, 0x4000, CRC(bfc28204) SHA1(506dd25cbd83a95f53d61d611eb82aea0d80900b))
	ROM_LOAD("fra17_ay.rom1", 0x4000, 0x2000, CRC(e1e0d26e) SHA1(8b31c08896b00c018911b20b6ba7375befcaf320))
	ROM_RELOAD(               0x6000, 0x2000)
	ROM_LOAD("fra24_az.rom2", 0x8000, 0x4000, CRC(5cbf89d6) SHA1(b4a94eb0ba548e281c24ff118ddaca4fe66802fa))
ROM_END


/*    YEAR  NAME     PARENT  COMPAT   MACHINE   INPUT     CLASS           INIT        COMPANY                 FULLNAME             FLAGS */
//COMP( 1982, hektor2, 0,      0,       hektor2,  hektor2,  hektor2_state,  empty_init, "The Open University",  "Hektor II (PT502)", MACHINE_NOT_WORKING )
COMP( 1984, hektor3, 0,      0,       hektor3,  hektor3,  hektor3_state,  empty_init, "The Open University",  "Hektor III",        0 )