new WORKING machines: Chess King (#10753)

new WORKING machines
-----------------
Chess King (Model ET-6) [Ankos, David Haywood, hap]

src/mame/handheld/chesskng.cpp

@@ -0,0 +1,254 @@
+// license:BSD-3-Clause
+// copyright-holders:David Haywood, hap
+
+#include "emu.h"
+
+#include "screen.h"
+#include "speaker.h"
+
+#include "cpu/nec/nec.h"
+#include "machine/nvram.h"
+#include "sound/beep.h"
+
+class chesskng_state : public driver_device
+{
+public:
+	chesskng_state(const machine_config &mconfig, device_type type, const char *tag) :
+		driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"),
+		m_screen(*this, "screen"),
+		m_mainram(*this, "mainram"),
+		m_beeper(*this, "beeper")
+	{ }
+
+	void chesskng(machine_config &config);
+
+protected:
+	virtual void machine_start() override;
+
+private:
+	// Devices
+	required_device<cpu_device> m_maincpu;
+	required_device<screen_device> m_screen;
+	required_shared_ptr<uint8_t> m_mainram;
+	required_device<beep_device> m_beeper;
+
+	void chesskng_map(address_map &map);
+	void chesskng_io(address_map &map);
+
+	void update_beeper();
+
+	void unk_1f_w(uint8_t data);
+	void unk_2f_w(uint8_t data);
+	uint8_t unk_3f_r();
+	void beeper_enable_w(uint8_t data);
+	void irq_clear_w(uint8_t data);
+	void unk_5f_w(uint8_t data);
+	void unk_6f_w(uint8_t data);
+	void unk_7f_w(uint8_t data);
+	void beeper_freq_low_w(uint8_t data);
+	void beeper_freq_high_w(uint8_t data);
+	void unk_af_w(uint8_t data);
+
+	INTERRUPT_GEN_MEMBER(interrupt);
+
+	uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+	uint8_t m_3f_data;
+	uint16_t m_beeper_freq;
+};
+
+void chesskng_state::machine_start()
+{
+	m_3f_data = 0;
+	m_beeper_freq = 0;
+
+	save_item(NAME(m_3f_data));
+	save_item(NAME(m_beeper_freq));
+}
+
+void chesskng_state::unk_1f_w(uint8_t data)
+{
+	logerror("%s: 1f write %02x\n", machine().describe_context(), data);
+}
+
+void chesskng_state::unk_2f_w(uint8_t data)
+{
+	logerror("%s: 2f write %02x\n", machine().describe_context(), data);
+}
+
+uint8_t chesskng_state::unk_3f_r()
+{
+	// could this be the volume dial? gets used for writes to 0xaf
+	//  - unlikely as there's little reason for it to work this way
+	return m_3f_data;
+}
+
+void chesskng_state::beeper_enable_w(uint8_t data)
+{
+	//logerror("%s: 3f write %02x\n", machine().describe_context(), data);
+	m_beeper->set_state(BIT(data, 3));
+}
+
+void chesskng_state::irq_clear_w(uint8_t data)
+{
+	m_maincpu->set_input_line(0, CLEAR_LINE);
+}
+
+void chesskng_state::unk_5f_w(uint8_t data)
+{
+	logerror("%s: 5f write %02x\n", machine().describe_context(), data);
+}
+
+void chesskng_state::unk_6f_w(uint8_t data)
+{
+	logerror("%s: 6f write %02x\n", machine().describe_context(), data);
+}
+
+void chesskng_state::unk_7f_w(uint8_t data)
+{
+	// writes values from 0x07 to 0x00 before menu appears, also writes 00 / 01 when audio is playing
+	logerror("%s: 7f write %02x\n", machine().describe_context(), data);
+}
+
+void chesskng_state::beeper_freq_low_w(uint8_t data)
+{
+	//logerror("%s: 8f write %02x\n", machine().describe_context(), data);
+	m_beeper_freq = (m_beeper_freq & 0xff00) | data;
+	update_beeper();
+}
+
+void chesskng_state::beeper_freq_high_w(uint8_t data)
+{
+	//logerror("%s: 9f write %02x\n", machine().describe_context(), data);
+	m_beeper_freq = (m_beeper_freq & 0x00ff) | data << 8;
+	update_beeper();
+}
+
+
+void chesskng_state::unk_af_w(uint8_t data)
+{
+	// writes 0x10 at startup and 0x00 / 0x08 when audio is playing
+	if ((data != 0x08) && (data != 0x00))
+	{
+		logerror("%s: af write %02x\n", machine().describe_context(), data);
+	}
+}
+
+void chesskng_state::update_beeper()
+{
+	double step = (9.6_MHz_XTAL).dvalue() / 0x100000;
+	m_beeper->set_clock(((0xffff ^ m_beeper_freq) + 1) * step);
+}
+
+void chesskng_state::chesskng_map(address_map &map)
+{
+	map(0x00000, 0x0ffff).ram().share(m_mainram); // 2x SRM20256 RAM
+	map(0x80000, 0x9ffff).rom().region("maincpu", 0x00000);
+	// gap in ROM space?
+	map(0xe0000, 0xfffff).rom().region("maincpu", 0x20000);
+}
+
+void chesskng_state::chesskng_io(address_map &map)
+{
+	map(0x0f, 0x0f).portr("BUTTONS");
+	map(0x3f, 0x3f).r(FUNC(chesskng_state::unk_3f_r));
+
+	map(0x1f, 0x1f).w(FUNC(chesskng_state::unk_1f_w)); // start-up only
+	map(0x2f, 0x2f).w(FUNC(chesskng_state::unk_2f_w)); // start-up only
+	map(0x3f, 0x3f).w(FUNC(chesskng_state::beeper_enable_w)); // frequently, at the same times as 7f/8f/9f/af writes, note address is also read
+	map(0x4f, 0x4f).w(FUNC(chesskng_state::irq_clear_w)); // irq clear?
+	map(0x5f, 0x5f).w(FUNC(chesskng_state::unk_5f_w)); // start-up only
+	map(0x6f, 0x6f).w(FUNC(chesskng_state::unk_6f_w)); // less frequently than below
+
+	// are these all sound related? they all occur when sounds might be expected
+	map(0x7f, 0x7f).w(FUNC(chesskng_state::unk_7f_w)); // frequently written at a similar time to the audio
+	map(0x8f, 0x8f).w(FUNC(chesskng_state::beeper_freq_low_w)); // beeper freq low?
+	map(0x9f, 0x9f).w(FUNC(chesskng_state::beeper_freq_high_w)); // beeper freq high?
+	map(0xaf, 0xaf).w(FUNC(chesskng_state::unk_af_w)); // frequently written at a similar time to the audio
+}
+
+uint32_t chesskng_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+	// quickly draw from memory (should be handled by LCDC?)
+	for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
+	{
+		int offset = y * 256 / 8;
+
+		uint32_t *dst = &bitmap.pix(y);
+		for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
+		{
+			// 2 256x256 images (160x160 area used) one at c000, one at e000 to form 2bpp graphics
+			uint8_t data = m_mainram[0xc000 + offset + x/8];
+			uint8_t data2 = m_mainram[0xe000 + offset + x/8];
+
+			int xx = x % 8;
+
+			uint8_t pix = (data >> (7 - xx)) & 1;
+			pix |= ((data2 >> (7 - xx)) & 1) << 1;
+
+			rgb_t pens[4] = { rgb_t::white(), rgb_t(0x40,0x40,0x40), rgb_t(0xc0,0xc0,0xc0), rgb_t::black() };
+			dst[x] = pens[pix];
+		}
+	}
+	return 0;
+}
+
+static INPUT_PORTS_START( chesskng )
+	PORT_START("BUTTONS") // if this port returns 0x0f (all 4 directions pressed assuming ACTIVE_LOW? - they're buttons not a dpad) the unit enters a test/data clear mode of sorts
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SELECT )
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START )
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 ) // A
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) // B
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_16WAY
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_16WAY
+	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_16WAY
+	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_16WAY
+INPUT_PORTS_END
+
+INTERRUPT_GEN_MEMBER(chesskng_state::interrupt)
+{
+	device.execute().set_input_line_and_vector(0, ASSERT_LINE, 0x20/4);
+}
+
+void chesskng_state::chesskng(machine_config &config)
+{
+	// Basic machine hardware
+	V20(config, m_maincpu, 9.6_MHz_XTAL); // D70108HG-10 V20
+	m_maincpu->set_addrmap(AS_PROGRAM, &chesskng_state::chesskng_map);
+	m_maincpu->set_addrmap(AS_IO, &chesskng_state::chesskng_io);
+	m_maincpu->set_periodic_int(FUNC(chesskng_state::interrupt), attotime::from_hz(9.6_MHz_XTAL / 0x10000)); // gives approximate seconds on timer
+
+	// Video hardware
+	SCREEN(config, m_screen, SCREEN_TYPE_LCD);
+	m_screen->set_refresh_hz(60);
+	m_screen->set_size(160, 160);
+	m_screen->set_visarea(0, 160-1, 0, 160-1);
+	m_screen->set_screen_update(FUNC(chesskng_state::screen_update));
+
+	// There are 2x HD66204F (LCDC)
+	// and 1x HD66205F (LCDC)
+	// then another with a sticker over the part (probably another HD620xF?)
+	// 16160
+	// S2RB
+	// 94.10
+
+	NVRAM(config, "mainram", nvram_device::DEFAULT_ALL_0);
+
+	// Sound hardware
+	SPEAKER(config, "mono").front_center();
+
+	BEEP(config, m_beeper, 0);
+	m_beeper->add_route(ALL_OUTPUTS, "mono", 1.0);
+
+	// Has a cartridge slot
+}
+
+ROM_START( chesskng )
+	ROM_REGION( 0x040000, "maincpu", 0 )
+	ROM_LOAD( "chess_king_etmate-cch.bin", 0x000000, 0x040000, CRC(a4d1764b) SHA1(ccfae1e985f6ad316ff192206fbc0f8bcd4e44d5) )
+
+	// there is also a CCH01 ET-MATE F3X0 713 near the CPU, what is it?
+ROM_END
+
+CONS( 1994, chesskng, 0, 0, chesskng, chesskng, chesskng_state, empty_init, "I-Star Co.,Ltd", "Chess King (Model ET-6)", MACHINE_IMPERFECT_SOUND ) // sound not 100% verified against device output

src/mame/mame.lst

@@ -15063,6 +15063,9 @@ gcus                            // (c) 2001 Nintendo
 gceu                            // (c) 2002 Nintendo
 gcbr                            // (c) 2002 Nintendo
 
+@source:handheld/chesskng.cpp
+chesskng                        //
+
 @source:handheld/gameking.cpp
 gamekin3                        //
 gameking                        //

src/mame/mess.flt

@@ -289,6 +289,7 @@ gamepark/gp2x.cpp
 gamepark/gp32.cpp
 gridcomp/gridcomp.cpp
 grundy/newbrain.cpp
+handheld/chesskng.cpp
 handheld/gameking.cpp
 handheld/gmaster.cpp
 handheld/hh_cop400.cpp