From 69a57a5b7bdf904cc115b23c478b778ced27ded8 Mon Sep 17 00:00:00 2001 From: hap Date: Tue, 27 Dec 2022 19:19:32 +0100 Subject: chessking: small cleanup, add driver notes --- src/mame/handheld/chessking.cpp | 164 ++++++++++++++++++++++------------------ 1 file changed, 92 insertions(+), 72 deletions(-) diff --git a/src/mame/handheld/chessking.cpp b/src/mame/handheld/chessking.cpp index 2f2470ed598..4aa6318dd0e 100644 --- a/src/mame/handheld/chessking.cpp +++ b/src/mame/handheld/chessking.cpp @@ -1,19 +1,48 @@ // license:BSD-3-Clause // copyright-holders:David Haywood, hap +/* -#include "emu.h" +Chess King, LCD handheld presumably from Taiwan +Hold down u+d+l+r buttons at boot to enter a test/data clear mode of sorts. -#include "screen.h" -#include "speaker.h" +TODO: +- lots of unknown writes +- sound emulation is guessed +- LCD chip(s) is not emulated, maybe the I/O chip does a DMA from main RAM to the LCD? +- cartridge, probably at 0x20000 + +Hardware notes: + +Main: +- PCB label: TD-24 +- NEC D70108HG-10 V20, 9.600MHz XTAL +- 64KB ROM (2*SRM20256), 256KB ROM (custom label) +- unknown 80 pin QFP, label CCH01 ET-MATE F3X0 713, assume custom I/O chip +- cartridge slot + +LCD module: +- PCB label: P102-2, DATA VISION +- 2*Hitachi HD66204F, Hitachi HD66205F +- unknown 80 pin QFP, label 16160 S2RB 94.10 +- 160*160 LCD screen + +*/ + +#include "emu.h" #include "cpu/nec/nec.h" #include "machine/nvram.h" #include "sound/beep.h" -class chesskng_state : public driver_device +#include "screen.h" +#include "speaker.h" + +namespace { + +class chessking_state : public driver_device { public: - chesskng_state(const machine_config &mconfig, device_type type, const char *tag) : + chessking_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_maincpu(*this, "maincpu"), m_screen(*this, "screen"), @@ -27,7 +56,6 @@ protected: virtual void machine_start() override; private: - // Devices required_device m_maincpu; required_device m_screen; required_shared_ptr m_mainram; @@ -41,134 +69,129 @@ private: 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 unk_3f_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); + void beeper_enable_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; + uint8_t m_3f_data = 0; + uint16_t m_beeper_freq = 0; }; -void chesskng_state::machine_start() +void chessking_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) +void chessking_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) +void chessking_state::unk_2f_w(uint8_t data) { logerror("%s: 2f write %02x\n", machine().describe_context(), data); } -uint8_t chesskng_state::unk_3f_r() +uint8_t chessking_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 + // - 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) +void chessking_state::unk_3f_w(uint8_t data) { //logerror("%s: 3f write %02x\n", machine().describe_context(), data); - m_beeper->set_state(BIT(data, 3)); + m_3f_data = data; } -void chesskng_state::irq_clear_w(uint8_t data) +void chessking_state::irq_clear_w(uint8_t data) { + // writes here at the start of irq routine m_maincpu->set_input_line(0, CLEAR_LINE); } -void chesskng_state::unk_5f_w(uint8_t data) +void chessking_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) +void chessking_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) +void chessking_state::unk_7f_w(uint8_t data) { - // writes values from 0x07 to 0x00 before menu appears, also writes 00 / 01 when audio is playing + // writes values from 0x07 to 0x00 before menu appears, also writes 0x00 / 0x01 when audio is playing logerror("%s: 7f write %02x\n", machine().describe_context(), data); } -void chesskng_state::beeper_freq_low_w(uint8_t data) +void chessking_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) +void chessking_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) +void chessking_state::beeper_enable_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); - } + // writes same value here after writing to 0x3f, assume sound related since + // the register is in proximity of sound freq registers + m_beeper->set_state(BIT(data, 3)); } -void chesskng_state::update_beeper() +void chessking_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) +void chessking_state::chesskng_map(address_map &map) { - map(0x00000, 0x0ffff).ram().share(m_mainram); // 2x SRM20256 RAM + map(0x00000, 0x0ffff).ram().share(m_mainram); 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) +void chessking_state::chesskng_io(address_map &map) { map(0x0f, 0x0f).portr("BUTTONS"); - map(0x3f, 0x3f).r(FUNC(chesskng_state::unk_3f_r)); + map(0x3f, 0x3f).r(FUNC(chessking_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 + map(0x1f, 0x1f).w(FUNC(chessking_state::unk_1f_w)); // start-up only + map(0x2f, 0x2f).w(FUNC(chessking_state::unk_2f_w)); // start-up only + map(0x3f, 0x3f).w(FUNC(chessking_state::unk_3f_w)); // frequently, at the same times as 7f/8f/9f/af writes, note address is also read + map(0x4f, 0x4f).w(FUNC(chessking_state::irq_clear_w)); // irq clear? + map(0x5f, 0x5f).w(FUNC(chessking_state::unk_5f_w)); // start-up only + map(0x6f, 0x6f).w(FUNC(chessking_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 + map(0x7f, 0x7f).w(FUNC(chessking_state::unk_7f_w)); // frequently written at a similar time to the audio + map(0x8f, 0x8f).w(FUNC(chessking_state::beeper_freq_low_w)); // beeper freq low? + map(0x9f, 0x9f).w(FUNC(chessking_state::beeper_freq_high_w)); // beeper freq high? + map(0xaf, 0xaf).w(FUNC(chessking_state::beeper_enable_w)); // beeper enable? } -uint32_t chesskng_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +uint32_t chessking_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++) @@ -191,11 +214,12 @@ uint32_t chesskng_state::screen_update(screen_device &screen, bitmap_rgb32 &bitm 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_START("BUTTONS") 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 @@ -206,49 +230,45 @@ static INPUT_PORTS_START( chesskng ) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_16WAY INPUT_PORTS_END -INTERRUPT_GEN_MEMBER(chesskng_state::interrupt) +INTERRUPT_GEN_MEMBER(chessking_state::interrupt) { device.execute().set_input_line_and_vector(0, ASSERT_LINE, 0x20/4); } -void chesskng_state::chesskng(machine_config &config) +void chessking_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 + m_maincpu->set_addrmap(AS_PROGRAM, &chessking_state::chesskng_map); + m_maincpu->set_addrmap(AS_IO, &chessking_state::chesskng_io); + + attotime irq_freq = attotime::from_hz(9.6_MHz_XTAL / 0x10000); // gives approximate seconds on timer + m_maincpu->set_periodic_int(FUNC(chessking_state::interrupt), irq_freq); + + NVRAM(config, "mainram", nvram_device::DEFAULT_ALL_0); // 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); + m_screen->set_visarea_full(); + m_screen->set_screen_update(FUNC(chessking_state::screen_update)); // Sound hardware SPEAKER(config, "mono").front_center(); BEEP(config, m_beeper, 0); - m_beeper->add_route(ALL_OUTPUTS, "mono", 1.0); + m_beeper->add_route(ALL_OUTPUTS, "mono", 0.5); // 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_LOAD( "etmate-cch.u6", 0x000000, 0x040000, CRC(a4d1764b) SHA1(ccfae1e985f6ad316ff192206fbc0f8bcd4e44d5) ) 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 +} // anonymous namespace + + +CONS( 1994, chesskng, 0, 0, chesskng, chesskng, chessking_state, empty_init, "I-Star Co., Ltd.", "Chess King (Model ET-6)", MACHINE_IMPERFECT_SOUND ) // sound not 100% verified against device output -- cgit v1.2.3