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diff --git a/src/mame/drivers/cking_master.cpp b/src/mame/drivers/cking_master.cpp
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+// license:BSD-3-Clause
+// copyright-holders:hap
+// thanks-to:Berger
+/******************************************************************************
+
+Master: (yes, it's plainly named "Master")
+- 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
+
+TODO:
+- 1 WAIT CLK per M1, workaround with z80_set_cycle_tables is possible
+ (wait state is similar to MSX) but I can't be bothered, better solution
+ is to add M1 pin to the z80 core. Until then, it'll run ~20% too fast.
+
+******************************************************************************/
+
+#include "emu.h"
+#include "includes/ckingbase.h"
+
+#include "cpu/z80/z80.h"
+#include "machine/bankdev.h"
+#include "sound/dac.h"
+#include "sound/volt_reg.h"
+#include "speaker.h"
+
+// internal artwork
+#include "ck_master.lh" // clickable
+
+
+namespace {
+
+class master_state : public ckingbase_state
+{
+public:
+ master_state(const machine_config &mconfig, device_type type, const char *tag) :
+ ckingbase_state(mconfig, type, tag),
+ m_dac(*this, "dac"),
+ m_mainmap(*this, "mainmap")
+ { }
+
+ void master(machine_config &config);
+
+ void init_master();
+
+private:
+ // devices/pointers
+ required_device<dac_2bit_binary_weighted_ones_complement_device> m_dac;
+ required_device<address_map_bank_device> m_mainmap;
+
+ void main_map(address_map &map);
+ void main_trampoline(address_map &map);
+ 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);
+};
+
+
+
+/******************************************************************************
+ Devices, I/O
+******************************************************************************/
+
+// TTL/generic
+
+void master_state::control_w(u8 data)
+{
+ // d0-d3: 74145 A-D
+ // 74145 0-9: input mux, led select
+ u16 sel = 1 << (data & 0xf) & 0x3ff;
+ m_inp_mux = sel;
+
+ // d4,d5: led data
+ display_matrix(2, 9, data >> 4 & 3, sel & 0x1ff);
+
+ // d6,d7: speaker +/-
+ m_dac->write(data >> 6 & 3);
+}
+
+u8 master_state::input_r()
+{
+ // d0-d7: multiplexed inputs (active low)
+ return ~read_inputs(10);
+}
+
+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)];
+}
+
+
+
+/******************************************************************************
+ 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_INCLUDE( cking_cb_buttons )
+
+ PORT_START("IN.8")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_NAME("Change Position")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_2) PORT_NAME("Clear Board")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_3) PORT_NAME("New Game")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_4) PORT_NAME("Take Back")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_5) PORT_NAME("King")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_6) PORT_NAME("Queen")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_7) PORT_NAME("Rook")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("IN.9")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_8) PORT_NAME("Bishop")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_9) PORT_NAME("Knight")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_0) PORT_NAME("Pawn")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_Q) PORT_NAME("White")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_W) PORT_NAME("Black")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_E) PORT_NAME("Move")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_R) PORT_NAME("Level")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_T) PORT_NAME("Sound")
+INPUT_PORTS_END
+
+
+
+/******************************************************************************
+ Machine Drivers
+******************************************************************************/
+
+void master_state::master(machine_config &config)
+{
+ /* basic machine hardware */
+ Z80(config, m_maincpu, 8_MHz_XTAL/2);
+ m_maincpu->set_addrmap(AS_PROGRAM, &master_state::main_trampoline);
+ ADDRESS_MAP_BANK(config, "mainmap").set_map(&master_state::main_map).set_options(ENDIANNESS_LITTLE, 8, 16);
+
+ const attotime irq_period = attotime::from_hz(429); // theoretical frequency from 555 timer (22nF, 150K, 1K5), measurement was 418Hz
+ TIMER(config, m_irq_on).configure_periodic(FUNC(master_state::irq_on<INPUT_LINE_IRQ0>), irq_period);
+ m_irq_on->set_start_delay(irq_period - attotime::from_nsec(22870)); // active for 22.87us
+ TIMER(config, "irq_off").configure_periodic(FUNC(master_state::irq_off<INPUT_LINE_IRQ0>), irq_period);
+
+ TIMER(config, "display_decay").configure_periodic(FUNC(ckingbase_state::display_decay_tick), attotime::from_msec(1));
+ config.set_default_layout(layout_ck_master);
+
+ /* sound hardware */
+ SPEAKER(config, "speaker").front_center();
+ DAC_2BIT_BINARY_WEIGHTED_ONES_COMPLEMENT(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.25);
+ voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
+ vref.set_output(5.0);
+ vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
+ vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
+}
+
+
+
+/******************************************************************************
+ ROM Definitions
+******************************************************************************/
+
+ROM_START( ckmaster )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD("ckmaster.ic2", 0x0000, 0x2000, CRC(59cbec9e) SHA1(2e0629e65778da62bed857406b91a334698d2fe8) ) // D2764C, no label
+ROM_END
+
+} // anonymous namespace
+
+
+
+/******************************************************************************
+ Drivers
+******************************************************************************/
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+CONS( 1984, ckmaster, 0, 0, master, master, master_state, init_master, "Chess King", "Master (Chess King)", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK | MACHINE_IMPERFECT_CONTROLS )