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+// license:BSD-3-Clause
+// copyright-holders:hap
+// thanks-to:Berger
+/*******************************************************************************
+
+Chess King Master (yes, it's plainly named "Master")
+
+Chess King was a UK business formed by Intelligent Software Ltd (later known as
+Intelligent Chess Software Ltd, after the fiasco with the Enterprise home computer),
+so logically, all the programs were by them. According to the manual, the chess
+engine of Master is Cyrus (by Richard Lang).
+
+To start a new game, press CHANGE POSITION, NEW GAME, and CHANGE POSITION again.
+
+Hardware notes:
+- PCB label: COPYRIGHT CHESS KING
+- Z80 CPU(NEC D780C-1) @ 4MHz(8MHz XTAL), IRQ from 555 timer
+- 8KB ROM(NEC D2764C-3), 2KB RAM(NEC D4016C), ROM is scrambled for easy PCB placement
+- simple I/O via 2*74373 and a 74145
+- 8*8 chessboard buttons, 32+1 border leds, piezo
+
+*******************************************************************************/
+
+#include "emu.h"
+
+#include "cpu/z80/z80.h"
+#include "machine/bankdev.h"
+#include "machine/clock.h"
+#include "machine/sensorboard.h"
+#include "sound/dac.h"
+#include "video/pwm.h"
+
+#include "speaker.h"
+
+// internal artwork
+#include "cking_master.lh"
+
+
+namespace {
+
+class master_state : public driver_device
+{
+public:
+ master_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_board(*this, "board"),
+ m_dac(*this, "dac"),
+ m_mainmap(*this, "mainmap"),
+ m_inputs(*this, "IN.%u", 0)
+ { }
+
+ void master(machine_config &config);
+
+ void init_master();
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+
+private:
+ // devices/pointers
+ required_device<z80_device> m_maincpu;
+ required_device<pwm_display_device> m_display;
+ required_device<sensorboard_device> m_board;
+ required_device<dac_2bit_ones_complement_device> m_dac;
+ required_device<address_map_bank_device> m_mainmap;
+ required_ioport_array<2> m_inputs;
+
+ u8 m_inp_mux = 0;
+
+ // address maps
+ void main_map(address_map &map) ATTR_COLD;
+ void main_trampoline(address_map &map) ATTR_COLD;
+ u8 main_trampoline_r(offs_t offset);
+ void main_trampoline_w(offs_t offset, u8 data);
+
+ // I/O handlers
+ u8 input_r();
+ void control_w(u8 data);
+};
+
+
+
+/*******************************************************************************
+ Initialization
+*******************************************************************************/
+
+void master_state::init_master()
+{
+ u8 *rom = memregion("maincpu")->base();
+ const u32 len = memregion("maincpu")->bytes();
+
+ // descramble data lines
+ for (int i = 0; i < len; i++)
+ rom[i] = bitswap<8>(rom[i], 4,5,0,7,6,1,3,2);
+
+ // descramble address lines
+ std::vector<u8> buf(len);
+ memcpy(&buf[0], rom, len);
+ for (int i = 0; i < len; i++)
+ rom[i] = buf[bitswap<16>(i, 15,14,13,12,11,3,7,9, 10,8,6,5,4,2,1,0)];
+}
+
+void master_state::machine_start()
+{
+ // register for savestates
+ save_item(NAME(m_inp_mux));
+}
+
+
+
+/*******************************************************************************
+ I/O
+*******************************************************************************/
+
+void master_state::control_w(u8 data)
+{
+ // d0-d3: 74145 A-D
+ // 74145 0-9: input mux, led select
+ m_inp_mux = data & 0xf;
+ u16 sel = 1 << m_inp_mux & 0x3ff;
+
+ // d4,d5: led data
+ m_display->matrix(sel & 0x1ff, data >> 4 & 3);
+
+ // d6,d7: speaker +/-
+ m_dac->write(data >> 6 & 3);
+}
+
+u8 master_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 master_state::main_map(address_map &map)
+{
+ map(0x0000, 0x1fff).mirror(0x6000).rom().region("maincpu", 0); // _A15
+ map(0xa000, 0xa000).mirror(0x1fff).rw(FUNC(master_state::input_r), FUNC(master_state::control_w)); // A13
+ map(0xc000, 0xc7ff).mirror(0x3800).ram(); // A14
+}
+
+// PCB design is prone to bus conflicts, but should be fine if software obeys
+void master_state::main_trampoline_w(offs_t offset, u8 data)
+{
+ if (offset & 0x2000)
+ m_mainmap->write8((offset & 0x3fff) | 0x8000, data);
+ if (offset & 0x4000)
+ m_mainmap->write8((offset & 0x7fff) | 0x8000, data);
+}
+
+u8 master_state::main_trampoline_r(offs_t offset)
+{
+ u8 data = 0xff;
+ if (~offset & 0x8000)
+ data &= m_mainmap->read8(offset);
+ if (offset & 0x2000)
+ data &= m_mainmap->read8((offset & 0x3fff) | 0x8000);
+ if (offset & 0x4000)
+ data &= m_mainmap->read8((offset & 0x7fff) | 0x8000);
+
+ return data;
+}
+
+void master_state::main_trampoline(address_map &map)
+{
+ map(0x0000, 0xffff).rw(FUNC(master_state::main_trampoline_r), FUNC(master_state::main_trampoline_w));
+}
+
+
+
+/*******************************************************************************
+ Input Ports
+*******************************************************************************/
+
+static INPUT_PORTS_START( master )
+ PORT_START("IN.0")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_C) PORT_NAME("Change Position")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_R) PORT_NAME("Clear Board")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_N) PORT_NAME("New Game")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_T) PORT_NAME("Take Back")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_6_PAD) PORT_NAME("King")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_5_PAD) PORT_NAME("Queen")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_4_PAD) PORT_NAME("Rook")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("IN.1")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_3_PAD) PORT_NAME("Bishop")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD) PORT_NAME("Knight")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD) PORT_NAME("Pawn")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_W) PORT_NAME("White")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_B) PORT_NAME("Black")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_M) PORT_NAME("Move")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_L) PORT_NAME("Level")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_S) PORT_NAME("Sound")
+INPUT_PORTS_END
+
+
+
+/*******************************************************************************
+ Machine Configs
+*******************************************************************************/
+
+void master_state::master(machine_config &config)
+{
+ // basic machine hardware
+ Z80(config, m_maincpu, 8_MHz_XTAL/2);
+ m_maincpu->z80_set_m1_cycles(4+1); // 1 WAIT CLK per M1
+ m_maincpu->set_addrmap(AS_PROGRAM, &master_state::main_trampoline);
+ ADDRESS_MAP_BANK(config, m_mainmap).set_map(&master_state::main_map).set_options(ENDIANNESS_LITTLE, 8, 16);
+
+ auto &irq_clock(CLOCK(config, "irq_clock", 418)); // 555 timer (22nF, 150K, 1K5), measured 418Hz
+ irq_clock.set_pulse_width(attotime::from_nsec(22870)); // active for 22.87us
+ irq_clock.signal_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
+
+ SENSORBOARD(config, m_board).set_type(sensorboard_device::BUTTONS);
+ 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(9, 2);
+ config.set_default_layout(layout_cking_master);
+
+ // sound hardware
+ SPEAKER(config, "speaker").front_center();
+ DAC_2BIT_ONES_COMPLEMENT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.125);
+}
+
+
+
+/*******************************************************************************
+ ROM Definitions
+*******************************************************************************/
+
+ROM_START( master )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD("d2764c-3.ic2", 0x0000, 0x2000, CRC(59cbec9e) SHA1(2e0629e65778da62bed857406b91a334698d2fe8) ) // no custom label
+ROM_END
+
+} // anonymous namespace
+
+
+
+/*******************************************************************************
+ Drivers
+*******************************************************************************/
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY, FULLNAME, FLAGS
+SYST( 1983, master, 0, 0, master, master, master_state, init_master, "Chess King / Intelligent Software", "Master (Chess King)", MACHINE_SUPPORTS_SAVE )