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// license:BSD-3-Clause
// copyright-holders:hap
// thanks-to:Berger
/******************************************************************************

CXG Chess 2001, also sold by Hanimex as HCG 1900 and by CGL as Computachess Champion.
CXG Chess 3000 is assumed to be on similar hardware as this.

The chess engine is by Richard Lang, based on Cyrus.

CXG Systems S.A. and Newcrest Technology Ltd. are related companies, with
Eric White at the steering wheel. Newcrest(1984-1991) is probably a rename of
"White & Allcock"(1981-1984).

Hardware notes:
- Zilog Z8400APS @ 4 MHz (8MHz XTAL)
- 2KB RAM HM6116, 16KB ROM D27128D
- TTL, piezo, 8*8+9 LEDs, magnetic sensors

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/sensorboard.h"
#include "machine/timer.h"
#include "sound/dac.h"
#include "sound/volt_reg.h"
#include "video/pwm.h"
#include "speaker.h"

// internal artwork
#include "cxg_ch2001.lh" // clickable


namespace {

class ch2001_state : public driver_device
{
public:
	ch2001_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_irq_on(*this, "irq_on"),
		m_display(*this, "display"),
		m_board(*this, "board"),
		m_dac(*this, "dac"),
		m_inputs(*this, "IN.%u", 0)
	{ }

	// machine configs
	void ch2001(machine_config &config);

protected:
	virtual void machine_start() override;

private:
	// devices/pointers
	required_device<cpu_device> m_maincpu;
	required_device<timer_device> m_irq_on;
	required_device<pwm_display_device> m_display;
	required_device<sensorboard_device> m_board;
	required_device<dac_bit_interface> m_dac;
	required_ioport_array<2> m_inputs;

	// periodic interrupts
	template<int Line> TIMER_DEVICE_CALLBACK_MEMBER(irq_on) { m_maincpu->set_input_line(Line, ASSERT_LINE); }
	template<int Line> TIMER_DEVICE_CALLBACK_MEMBER(irq_off) { m_maincpu->set_input_line(Line, CLEAR_LINE); }

	// address maps
	void main_map(address_map &map);

	// I/O handlers
	DECLARE_WRITE8_MEMBER(speaker_w);
	DECLARE_WRITE8_MEMBER(leds_w);
	DECLARE_READ8_MEMBER(input_r);

	u16 m_inp_mux;
	int m_dac_data;
};

void ch2001_state::machine_start()
{
	// zerofill
	m_inp_mux = 0;
	m_dac_data = 0;

	// register for savestates
	save_item(NAME(m_inp_mux));
	save_item(NAME(m_dac_data));
}



/******************************************************************************
    I/O
******************************************************************************/

// TTL

WRITE8_MEMBER(ch2001_state::speaker_w)
{
	// 74ls109 toggle to speaker
	m_dac_data ^= 1;
	m_dac->write(m_dac_data);
}

WRITE8_MEMBER(ch2001_state::leds_w)
{
	// d0-d7: 74ls273 (WR to CLK)
	// 74ls273 Q1-Q4: 74ls145 A-D
	// 74ls145 0-9: input mux/led select
	m_inp_mux = data & 0xf;
	u16 sel = 1 << m_inp_mux & 0x3ff;

	// 74ls273 Q5-Q8: MC14028 A-D
	// MC14028 Q0-Q7: led data, Q8,Q9: N/C
	u8 led_data = 1 << (data >> 4 & 0xf) & 0xff;
	m_display->matrix(sel, led_data);
}

READ8_MEMBER(ch2001_state::input_r)
{
	u8 data = 0;

	// d0-d7: multiplexed inputs
	// read chessboard sensors
	if (m_inp_mux < 8)
		data = m_board->read_file(m_inp_mux, true);

	// read other buttons
	else if (m_inp_mux < 10)
		data = m_inputs[m_inp_mux - 8]->read();

	return ~data;
}



/******************************************************************************
    Address Maps
******************************************************************************/

void ch2001_state::main_map(address_map &map)
{
	map(0x0000, 0x3fff).rom();
	map(0x4000, 0x47ff).mirror(0x3800).ram();
	map(0x8000, 0x8000).mirror(0x3fff).rw(FUNC(ch2001_state::input_r), FUNC(ch2001_state::leds_w));
	map(0xc000, 0xc000).mirror(0x3fff).w(FUNC(ch2001_state::speaker_w));
}



/******************************************************************************
    Input Ports
******************************************************************************/

static INPUT_PORTS_START( ch2001 )
	PORT_START("IN.0")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_T) PORT_NAME("Black")
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_2) PORT_NAME("King")
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_3) PORT_NAME("Queen")
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_4) PORT_NAME("Rook")
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_W) PORT_NAME("Bishop")
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_E) PORT_NAME("Knight")
	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_R) PORT_NAME("Pawn")
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_5) PORT_NAME("White")

	PORT_START("IN.1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_NAME("Set up")
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_Q) PORT_NAME("New Game")
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_U) PORT_NAME("Take Back")
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_Y) PORT_NAME("Forward")
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_6) PORT_NAME("Hint")
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_I) PORT_NAME("Move")
	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_8) PORT_NAME("Level")
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_7) PORT_NAME("Sound")
INPUT_PORTS_END



/******************************************************************************
    Machine Configs
******************************************************************************/

void ch2001_state::ch2001(machine_config &config)
{
	/* basic machine hardware */
	Z80(config, m_maincpu, 8_MHz_XTAL/2);
	m_maincpu->set_addrmap(AS_PROGRAM, &ch2001_state::main_map);

	const attotime irq_period = attotime::from_hz(533); // theoretical frequency from 555 timer (20nF, 100K+33K, 1K2), measurement was 568Hz
	TIMER(config, m_irq_on).configure_periodic(FUNC(ch2001_state::irq_on<INPUT_LINE_IRQ0>), irq_period);
	m_irq_on->set_start_delay(irq_period - attotime::from_nsec(16600)); // active for 16.6us
	TIMER(config, "irq_off").configure_periodic(FUNC(ch2001_state::irq_off<INPUT_LINE_IRQ0>), irq_period);

	SENSORBOARD(config, m_board).set_type(sensorboard_device::MAGNETS);
	m_board->init_cb().set(m_board, FUNC(sensorboard_device::preset_chess));
	m_board->set_delay(attotime::from_msec(150));

	/* video hardware */
	PWM_DISPLAY(config, m_display).set_size(10, 8);
	config.set_default_layout(layout_cxg_ch2001);

	/* sound hardware */
	SPEAKER(config, "speaker").front_center();
	DAC_1BIT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.25);
	VOLTAGE_REGULATOR(config, "vref").add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
}



/******************************************************************************
    ROM Definitions
******************************************************************************/

ROM_START( ch2001 )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD("ch2001.bin", 0x0000, 0x4000, CRC(b3485c73) SHA1(f405c6f67fe70edf45dcc383a4049ee6bad387a9) ) // D27128D, no label
ROM_END

} // anonymous namespace



/******************************************************************************
    Drivers
******************************************************************************/

/*    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT        COMPANY, FULLNAME, FLAGS */
CONS( 1984, ch2001, 0,      0,      ch2001,  ch2001, ch2001_state, empty_init, "CXG Systems / Newcrest Technology", "Chess 2001", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK )