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

Fidelity Chess Challenger 7 (CC7, BCC)
------------------------
It was Fidelity's most sold chess computer. model CC7 is an older version.
CC7 known serial numbers range from 1979 to 1980. BCC from 1980 to 1983.

Zilog Z80A, 3.579MHz from XTAL
Z80 IRQ/NMI unused, no timer IC.
This is a cost-reduced design from CC10, no special I/O chips.

Backgammon Challenger (BKC) is the same PCB, with the speaker connection going
to the display panel instead.

CC7 (BCC) was also bootlegged around 1981 by Splice Industria Brasileira,
as "Byte XD-300". Mostek MK3880N-4 @ 4MHz, ROM contents is same as BCC REVB.

RE information from netlist by Berger (a BCC model)

Memory map:
-----------
0000-0FFF: 4K 2332 ROM CN19103N BCC-REVB.
2000-2FFF: ROM/RAM bus conflict!
3000-3FFF: 256 bytes RAM (2111 SRAM x2)
4000-FFFF: Z80 A14/A15 not connected

Port map (Write):
---------
D0-D3: digit select and keypad mux
D4: CHECK led
D5: LOSE led
A0-A2: NE591 A0-A2
D7: NE591 D (_C not used)
NE591 Q0-Q6: digit segments A-G
NE591 Q7: buzzer

Port map (Read):
---------
D0-D3: keypad row

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

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

// internal artwork
#include "fidel_bcc.lh" // clickable
#include "fidel_bkc.lh" // clickable


namespace {

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

	// machine configs
	void bcc(machine_config &config);
	void bkc(machine_config &config);

protected:
	virtual void machine_start() override;

private:
	// devices/pointers
	required_device<cpu_device> m_maincpu;
	required_device<pwm_display_device> m_display;
	optional_device<dac_bit_interface> m_dac;
	required_ioport_array<4> m_inputs;

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

	// I/O handlers
	u8 input_r();
	void control_w(offs_t offset, u8 data);

	u8 m_inp_mux = 0;
	u8 m_7seg_data = 0;
};

void bcc_state::machine_start()
{
	// register for savestates
	save_item(NAME(m_inp_mux));
	save_item(NAME(m_7seg_data));
}



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

// TTL

void bcc_state::control_w(offs_t offset, u8 data)
{
	// a0-a2,d7: digit segment data via NE591
	u8 mask = 1 << (offset & 7);
	m_7seg_data = (m_7seg_data & ~mask) | ((data & 0x80) ? mask : 0);

	// BCC: NE591 Q7 is speaker out
	if (m_dac != nullptr)
		m_dac->write(BIT(m_7seg_data, 7));

	// d0-d3: led select, input mux
	// d4,d5: upper leds(direct)
	m_display->matrix(data & 0x3f, m_7seg_data);
	m_inp_mux = data & 0xf;
}

u8 bcc_state::input_r()
{
	u8 data = 0;

	// d0-d3: multiplexed inputs
	for (int i = 0; i < 4; i++)
		if (BIT(m_inp_mux, i))
			data |= m_inputs[i]->read();

	return data;
}



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

void bcc_state::main_map(address_map &map)
{
	map.unmap_value_high();
	map.global_mask(0x3fff);
	map(0x0000, 0x0fff).rom();
	map(0x3000, 0x30ff).mirror(0x0f00).ram();
}

void bcc_state::main_io(address_map &map)
{
	map.global_mask(0x07);
	map(0x00, 0x07).rw(FUNC(bcc_state::input_r), FUNC(bcc_state::control_w));
}



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

static INPUT_PORTS_START( bcc )
	PORT_START("IN.0")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("EN") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("PV") PORT_CODE(KEYCODE_V)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D4") PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD) PORT_CODE(KEYCODE_D)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H8") PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD) PORT_CODE(KEYCODE_H)

	PORT_START("IN.1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_BACKSPACE)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("PB") PORT_CODE(KEYCODE_O)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C3") PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD) PORT_CODE(KEYCODE_C)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G7") PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD) PORT_CODE(KEYCODE_G)

	PORT_START("IN.2")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CB") PORT_CODE(KEYCODE_SPACE)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("DM") PORT_CODE(KEYCODE_M)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B2") PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD) PORT_CODE(KEYCODE_B)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F6") PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD) PORT_CODE(KEYCODE_F)

	PORT_START("IN.3")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RE") PORT_CODE(KEYCODE_R)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("LV") PORT_CODE(KEYCODE_L)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A1") PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD) PORT_CODE(KEYCODE_A)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E5") PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD) PORT_CODE(KEYCODE_E)
INPUT_PORTS_END

static INPUT_PORTS_START( bkc )
	PORT_START("IN.0")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("EN") PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CODE(KEYCODE_9_PAD)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD)

	PORT_START("IN.1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CL") PORT_CODE(KEYCODE_DEL) PORT_CODE(KEYCODE_BACKSPACE)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_8_PAD)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD)

	PORT_START("IN.2")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("GM") PORT_CODE(KEYCODE_SPACE)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_7_PAD)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD)

	PORT_START("IN.3")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RE") PORT_CODE(KEYCODE_R)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("PB") PORT_CODE(KEYCODE_O)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("PV") PORT_CODE(KEYCODE_V)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CODE(KEYCODE_0_PAD)
INPUT_PORTS_END



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

void bcc_state::bkc(machine_config &config)
{
	/* basic machine hardware */
	Z80(config, m_maincpu, 3.579545_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &bcc_state::main_map);
	m_maincpu->set_addrmap(AS_IO, &bcc_state::main_io);

	/* video hardware */
	PWM_DISPLAY(config, m_display).set_size(6, 8);
	m_display->set_segmask(0xf, 0x7f);
	config.set_default_layout(layout_fidel_bkc);
}

void bcc_state::bcc(machine_config &config)
{
	bkc(config);
	config.set_default_layout(layout_fidel_bcc);

	/* 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( cc7 ) // model BCC
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "cn19103n_bcc-revb", 0x0000, 0x1000, CRC(a397d471) SHA1(9b12bc442fccee40f4d8500c792bc9d886c5e1a5) ) // 2332
ROM_END

ROM_START( cc7o ) // model CC7, PCB label 510-380
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "101-32016", 0x0000, 0x1000, CRC(b9076c52) SHA1(09b17ac6cd6a1c5c62aea3649f3367bcf4405598) ) // 2332
ROM_END


ROM_START( backgamc ) // model BKC, PCB label P-380A-5
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "cn19255n_101-32012", 0x0000, 0x1000, CRC(0a8a19b7) SHA1(d6f0dd44b33c9b79570cf0ceac02a036ec91ba57) ) // 2332
ROM_END

} // anonymous namespace



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

//    YEAR  NAME      PARENT CMP MACHINE  INPUT  STATE      INIT        COMPANY, FULLNAME, FLAGS
CONS( 1979, cc7,      0,      0, bcc,     bcc,   bcc_state, empty_init, "Fidelity Electronics", "Chess Challenger \"7\" (model BCC, rev. B)", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK )
CONS( 1979, cc7o,     cc7,    0, bcc,     bcc,   bcc_state, empty_init, "Fidelity Electronics", "Chess Challenger \"7\" (model CC7)", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK ) // 2nd revision of model CC7?

CONS( 1979, backgamc, 0,      0, bkc,     bkc,   bcc_state, empty_init, "Fidelity Electronics", "Backgammon Challenger", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK | MACHINE_NO_SOUND_HW )