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https://github.com/holub/mame
synced 2025-04-20 15:32:45 +03:00
chessking: simplify cartridge emulation
This commit is contained in:
hap
parent
ca6c114dcb
commit
1c87b11897
@ -9,7 +9,6 @@ TODO:
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- lots of unknown writes
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- sound emulation is guessed
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- LCD chip(s) is not emulated, maybe the I/O chip does a DMA from main RAM to the LCD?
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- simplify cartridge, no need to go through address map bank
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Hardware notes:
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@ -34,7 +33,6 @@ LCD module:
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#include "bus/generic/slot.h"
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#include "bus/generic/carts.h"
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#include "cpu/nec/nec.h"
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#include "machine/bankdev.h"
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#include "machine/nvram.h"
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#include "sound/beep.h"
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@ -51,10 +49,10 @@ public:
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driver_device(mconfig, type, tag),
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m_maincpu(*this, "maincpu"),
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m_screen(*this, "screen"),
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m_mainrom(*this, "maincpu"),
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m_mainram(*this, "mainram"),
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m_videoram(*this, "videoram"),
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m_beeper(*this, "beeper"),
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m_mainbank(*this, "mainbank"),
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m_cart(*this, "cartslot")
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{ }
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@ -66,63 +64,47 @@ protected:
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private:
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required_device<cpu_device> m_maincpu;
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required_device<screen_device> m_screen;
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required_region_ptr<uint8_t> m_mainrom;
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required_shared_ptr<uint8_t> m_mainram;
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required_shared_ptr<uint8_t> m_videoram;
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required_device<beep_device> m_beeper;
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required_device<address_map_bank_device> m_mainbank;
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required_device<generic_slot_device> m_cart;
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DECLARE_DEVICE_IMAGE_LOAD_MEMBER(cart_load);
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void chesskng_map(address_map &map);
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void chesskng_io(address_map &map);
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void mainbank_map(address_map &map);
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DECLARE_DEVICE_IMAGE_LOAD_MEMBER(cart_load);
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uint8_t cartridge_r(offs_t offset);
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void cart_bank_w(uint8_t data);
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void update_beeper();
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void unk_1f_w(uint8_t data);
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void unk_2f_w(uint8_t data);
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uint8_t unk_3f_r();
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void unk_3f_w(uint8_t data);
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void irq_clear_w(uint8_t data);
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void unk_5f_w(uint8_t data);
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void unk_6f_w(uint8_t data);
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void cart_bank_w(uint8_t data);
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void beeper_freq_low_w(uint8_t data);
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void beeper_freq_high_w(uint8_t data);
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void beeper_enable_w(uint8_t data);
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INTERRUPT_GEN_MEMBER(interrupt);
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void irq_clear_w(uint8_t data);
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void unk_1f_w(uint8_t data);
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void unk_2f_w(uint8_t data);
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uint8_t unk_3f_r();
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void unk_3f_w(uint8_t data);
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void unk_5f_w(uint8_t data);
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void unk_6f_w(uint8_t data);
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uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
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uint8_t m_3f_data = 0;
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uint8_t m_cart_bank = 0;
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uint16_t m_beeper_freq = 0;
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};
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void chessking_state::machine_start()
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{
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save_item(NAME(m_3f_data));
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save_item(NAME(m_cart_bank));
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save_item(NAME(m_beeper_freq));
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m_mainbank->set_bank(0);
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}
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DEVICE_IMAGE_LOAD_MEMBER(chessking_state::cart_load)
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{
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uint32_t size = m_cart->common_get_size("rom");
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uint8_t* base = memregion("cart")->base();
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if (size != 0x200000)
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{
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image.seterror(image_error::INVALIDIMAGE, "Unsupported cartridge size");
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return image_init_result::FAIL;
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}
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m_cart->common_load_rom(base, size, "rom");
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return image_init_result::PASS;
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}
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/******************************************************************************
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@ -159,64 +141,9 @@ uint32_t chessking_state::screen_update(screen_device &screen, bitmap_rgb32 &bit
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/******************************************************************************
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I/O
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Sound
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******************************************************************************/
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// misc/unknown
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void chessking_state::unk_1f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 1f write %02x\n", machine().describe_context(), data);
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}
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void chessking_state::unk_2f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 2f write %02x\n", machine().describe_context(), data);
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}
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uint8_t chessking_state::unk_3f_r()
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{
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// could this be the volume dial? gets used for writes to 0xaf
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// - unlikely as there's little reason for it to work this way
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return m_3f_data;
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}
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void chessking_state::unk_3f_w(uint8_t data)
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{
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// writes frequently, at the same times as 7f/8f/9f/af writes, note address is also read
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//logerror("%s: 3f write %02x\n", machine().describe_context(), data);
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m_3f_data = data;
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}
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void chessking_state::irq_clear_w(uint8_t data)
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{
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// writes here at the start of irq routine
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m_maincpu->set_input_line(0, CLEAR_LINE);
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}
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void chessking_state::unk_5f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 5f write %02x\n", machine().describe_context(), data);
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}
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void chessking_state::unk_6f_w(uint8_t data)
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{
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logerror("%s: 6f write %02x\n", machine().describe_context(), data);
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}
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void chessking_state::cart_bank_w(uint8_t data)
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{
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// writes values from 0x07 to 0x00 before checking cartridge
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//logerror("%s: 7f write %02x\n", machine().describe_context(), data);
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m_mainbank->set_bank(data & 0x7);
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}
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// sound
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void chessking_state::beeper_freq_low_w(uint8_t data)
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{
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//logerror("%s: 8f write %02x\n", machine().describe_context(), data);
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@ -240,8 +167,93 @@ void chessking_state::beeper_enable_w(uint8_t data)
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void chessking_state::update_beeper()
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{
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uint16_t freq = (~m_beeper_freq & 0x1ff) + 1;
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double step = (9.6_MHz_XTAL).dvalue() / 0x100000;
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m_beeper->set_clock(((0xffff ^ m_beeper_freq) + 1) * step);
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m_beeper->set_clock(freq * step);
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}
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/******************************************************************************
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Cartridge
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******************************************************************************/
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DEVICE_IMAGE_LOAD_MEMBER(chessking_state::cart_load)
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{
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uint32_t size = m_cart->common_get_size("rom");
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m_cart->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
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m_cart->common_load_rom(m_cart->get_rom_base(), size, "rom");
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return image_init_result::PASS;
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}
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uint8_t chessking_state::cartridge_r(offs_t offset)
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{
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// bank 1 selects main rom
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if (m_cart_bank == 1)
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return m_mainrom[offset & 0x1ffff];
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else if (m_cart_bank & 4)
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return m_cart->read_rom(offset | (m_cart_bank & 3) << 19);
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return 0;
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}
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void chessking_state::cart_bank_w(uint8_t data)
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{
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m_cart_bank = data & 0x7;
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}
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/******************************************************************************
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Misc I/O
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******************************************************************************/
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INTERRUPT_GEN_MEMBER(chessking_state::interrupt)
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{
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device.execute().set_input_line_and_vector(0, ASSERT_LINE, 0x20/4);
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}
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void chessking_state::irq_clear_w(uint8_t data)
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{
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// writes here at the start of irq routine
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m_maincpu->set_input_line(0, CLEAR_LINE);
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}
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void chessking_state::unk_1f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 1f write %02x\n", machine().describe_context(), data);
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}
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void chessking_state::unk_2f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 2f write %02x\n", machine().describe_context(), data);
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}
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uint8_t chessking_state::unk_3f_r()
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{
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return m_3f_data;
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}
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void chessking_state::unk_3f_w(uint8_t data)
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{
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// writes frequently, at the same times as 7f/8f/9f/af writes, note address is also read
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//logerror("%s: 3f write %02x\n", machine().describe_context(), data);
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m_3f_data = data;
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}
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void chessking_state::unk_5f_w(uint8_t data)
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{
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// writes at start-up only
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logerror("%s: 5f write %02x\n", machine().describe_context(), data);
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}
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void chessking_state::unk_6f_w(uint8_t data)
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{
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logerror("%s: 6f write %02x\n", machine().describe_context(), data);
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}
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@ -252,12 +264,12 @@ void chessking_state::update_beeper()
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void chessking_state::chesskng_map(address_map &map)
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{
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map(0x00000, 0x7ffff).mirror(0x80000).r(FUNC(chessking_state::cartridge_r));
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map(0x00000, 0x1ffff).unmapr();
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map(0x00000, 0x07fff).ram().share(m_mainram); // SRM20256, battery-backed
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map(0x08000, 0x0ffff).ram().share(m_videoram); // SRM20256
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map(0x20000, 0x9ffff).m(m_mainbank, FUNC(address_map_bank_device::amap8));
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// gap in memory space?
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map(0xe0000, 0xfffff).rom().region("maincpu", 0x20000);
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}
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@ -276,26 +288,6 @@ void chessking_state::chesskng_io(address_map &map)
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map(0xaf, 0xaf).w(FUNC(chessking_state::beeper_enable_w));
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}
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void chessking_state::mainbank_map(address_map &map)
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{
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// map(0x000000, 0x07ffff);
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// map(0x060000, 0x07ffff).rom().region("maincpu", 0x000000);
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// map(0x080000, 0x0fffff);
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map(0x0e0000, 0x0fffff).rom().region("maincpu", 0x000000);
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map(0x200000, 0x25ffff).rom().region("cart", 0x020000);
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map(0x260000, 0x27ffff).rom().region("cart", 0x000000);
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map(0x280000, 0x2dffff).rom().region("cart", 0x0a0000);
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map(0x2e0000, 0x2fffff).rom().region("cart", 0x080000);
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map(0x300000, 0x35ffff).rom().region("cart", 0x120000);
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map(0x360000, 0x37ffff).rom().region("cart", 0x100000);
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map(0x380000, 0x3dffff).rom().region("cart", 0x1a0000);
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map(0x3e0000, 0x3fffff).rom().region("cart", 0x180000);
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}
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/******************************************************************************
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@ -320,11 +312,6 @@ INPUT_PORTS_END
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Machine Configs
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******************************************************************************/
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INTERRUPT_GEN_MEMBER(chessking_state::interrupt)
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{
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device.execute().set_input_line_and_vector(0, ASSERT_LINE, 0x20/4);
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}
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void chessking_state::chesskng(machine_config &config)
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{
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// Basic machine hardware
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@ -351,9 +338,7 @@ void chessking_state::chesskng(machine_config &config)
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m_beeper->add_route(ALL_OUTPUTS, "mono", 0.5);
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// Cartridge
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ADDRESS_MAP_BANK(config, "mainbank").set_map(&chessking_state::mainbank_map).set_options(ENDIANNESS_LITTLE, 8, 26, 0x80000);
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GENERIC_CARTSLOT(config, m_cart, generic_plain_slot, "chessking_cart");
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GENERIC_CARTSLOT(config, m_cart, generic_linear_slot, "chessking_cart");
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m_cart->set_device_load(FUNC(chessking_state::cart_load));
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SOFTWARE_LIST(config, "cart_list").set_original("chessking_cart");
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@ -368,8 +353,6 @@ void chessking_state::chesskng(machine_config &config)
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ROM_START( chesskng )
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ROM_REGION( 0x040000, "maincpu", 0 )
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ROM_LOAD( "etmate-cch.u6", 0x000000, 0x040000, CRC(a4d1764b) SHA1(ccfae1e985f6ad316ff192206fbc0f8bcd4e44d5) )
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ROM_REGION( 0x200000, "cart", ROMREGION_ERASE00 )
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ROM_END
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} // anonymous namespace
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