diff options
Diffstat (limited to 'src/devices/bus/msx/cart/ascii.cpp')
-rw-r--r-- | src/devices/bus/msx/cart/ascii.cpp | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/src/devices/bus/msx/cart/ascii.cpp b/src/devices/bus/msx/cart/ascii.cpp new file mode 100644 index 00000000000..9beb17197fc --- /dev/null +++ b/src/devices/bus/msx/cart/ascii.cpp @@ -0,0 +1,366 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "ascii.h" + +namespace { + +class msx_cart_ascii8_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_ascii8_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_CART_ASCII8, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_rombank(*this, "rombank%u", 0U) + , m_bank_mask(0) + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override { } + virtual void device_reset() override ATTR_COLD; + +private: + static constexpr size_t BANK_SIZE = 0x2000; + + template <int Bank> void bank_w(u8 data); + + memory_bank_array_creator<4> m_rombank; + u8 m_bank_mask; +}; + +void msx_cart_ascii8_device::device_reset() +{ + for (int i = 0; i < 4; i++) + m_rombank[i]->set_entry(0); +} + +std::error_condition msx_cart_ascii8_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_ascii8_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + const u32 size = cart_rom_region()->bytes(); + const u16 banks = size / BANK_SIZE; + + if (size > 256 * BANK_SIZE || size != banks * BANK_SIZE || (~(banks - 1) % banks)) + { + message = "msx_cart_ascii8_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + m_bank_mask = banks - 1; + + for (int i = 0; i < 4; i++) + m_rombank[i]->configure_entries(0, banks, cart_rom_region()->base(), BANK_SIZE); + + page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]); + page(1)->install_read_bank(0x6000, 0x7fff, m_rombank[1]); + page(1)->install_write_handler(0x6000, 0x67ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii8_device::bank_w<0>))); + page(1)->install_write_handler(0x6800, 0x6fff, emu::rw_delegate(*this, FUNC(msx_cart_ascii8_device::bank_w<1>))); + page(1)->install_write_handler(0x7000, 0x77ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii8_device::bank_w<2>))); + page(1)->install_write_handler(0x7800, 0x7fff, emu::rw_delegate(*this, FUNC(msx_cart_ascii8_device::bank_w<3>))); + page(2)->install_read_bank(0x8000, 0x9fff, m_rombank[2]); + page(2)->install_read_bank(0xa000, 0xbfff, m_rombank[3]); + + return std::error_condition(); +} + +template <int Bank> +void msx_cart_ascii8_device::bank_w(u8 data) +{ + m_rombank[Bank]->set_entry(data & m_bank_mask); +} + + + +class msx_cart_ascii16_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_ascii16_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_CART_ASCII16, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_rombank(*this, "rombank%u", 0U) + , m_bank_mask(0) + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override { } + virtual void device_reset() override ATTR_COLD; + +private: + static constexpr size_t BANK_SIZE = 0x4000; + + template <int Bank> void bank_w(u8 data); + + memory_bank_array_creator<2> m_rombank; + u8 m_bank_mask; +}; + +void msx_cart_ascii16_device::device_reset() +{ + m_rombank[0]->set_entry(0); + m_rombank[1]->set_entry(0); +} + +std::error_condition msx_cart_ascii16_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_ascii16_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + const u32 size = cart_rom_region()->bytes(); + const u16 banks = size / BANK_SIZE; + + if (size > 256 * BANK_SIZE || size != banks * BANK_SIZE || (~(banks - 1) % banks)) + { + message = "msx_cart_ascii16_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + m_bank_mask = banks - 1; + + for (int i = 0; i < 2; i++) + m_rombank[i]->configure_entries(0, banks, cart_rom_region()->base(), BANK_SIZE); + + page(1)->install_read_bank(0x4000, 0x7fff, m_rombank[0]); + page(1)->install_write_handler(0x6000, 0x67ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii16_device::bank_w<0>))); + page(1)->install_write_handler(0x7000, 0x77ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii16_device::bank_w<1>))); + page(2)->install_read_bank(0x8000, 0xbfff, m_rombank[1]); + + return std::error_condition(); +} + +template <int Bank> +void msx_cart_ascii16_device::bank_w(u8 data) +{ + m_rombank[Bank]->set_entry(data & m_bank_mask); +} + + + + + +class msx_cart_ascii8_sram_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_ascii8_sram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_CART_ASCII8_SRAM, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_rombank(*this, "rombank%u", 0U) + , m_view{ {*this, "view2"}, {*this, "view3"} } + , m_bank_mask(0) + , m_sram_select_mask(0) + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override { } + virtual void device_reset() override ATTR_COLD; + +private: + static constexpr size_t BANK_SIZE = 0x2000; + + void mapper_write(offs_t offset, u8 data); + + memory_bank_array_creator<4> m_rombank; + memory_view m_view[2]; + u8 m_bank_mask; + u8 m_sram_select_mask; +}; + +void msx_cart_ascii8_sram_device::device_reset() +{ + for (int i = 0; i < 4; i++) + m_rombank[i]->set_entry(0); + m_view[0].select(0); + m_view[1].select(0); +} + +std::error_condition msx_cart_ascii8_sram_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_ascii8_sram_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + if (!cart_sram_region()) + { + message = "msx_cart_ascii8_sram_device: Required region 'sram' was not found."; + return image_error::INTERNAL; + } + + const u32 size = cart_rom_region()->bytes(); + const u16 banks = size / BANK_SIZE; + + if (size > 128 * BANK_SIZE || size != banks * BANK_SIZE || (~(banks - 1) % banks)) + { + message = "msx_cart_ascii8_sram_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + if (cart_sram_region()->bytes() < 0x2000) + { + message = "msx_cart_ascii8_sram_device: Region 'sram' has unsupported size."; + return image_error::BADSOFTWARE; + } + + m_bank_mask = banks - 1; + m_sram_select_mask = banks; + + for (int i = 0; i < 4; i++) + m_rombank[i]->configure_entries(0, banks, cart_rom_region()->base(), BANK_SIZE); + + page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]); + page(1)->install_read_bank(0x6000, 0x7fff, m_rombank[1]); + page(1)->install_write_handler(0x6000, 0x7fff, emu::rw_delegate(*this, FUNC(msx_cart_ascii8_sram_device::mapper_write))); + page(2)->install_view(0x8000, 0x9fff, m_view[0]); + m_view[0][0].install_read_bank(0x8000, 0x9fff, m_rombank[2]); + m_view[0][1].install_ram(0x8000, 0x9fff, cart_sram_region()->base()); + page(2)->install_view(0xa000, 0xbfff, m_view[1]); + m_view[1][0].install_read_bank(0xa000, 0xbfff, m_rombank[3]); + m_view[1][1].install_ram(0xa000, 0xbfff, cart_sram_region()->base()); + + return std::error_condition(); +} + +void msx_cart_ascii8_sram_device::mapper_write(offs_t offset, u8 data) +{ + u8 bank = (offset / 0x800) & 0x03; + if (data & m_sram_select_mask) + { + if (BIT(bank, 1)) + m_view[BIT(bank, 0)].select(1); + } + else + { + if (BIT(bank, 1)) + m_view[BIT(bank, 0)].select(0); + + m_rombank[bank]->set_entry(data & m_bank_mask); + } +} + + + + +class msx_cart_ascii16_sram_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_ascii16_sram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, MSX_CART_ASCII16_SRAM, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_rombank(*this, "rombank%u", 0U) + , m_view(*this, "view") + , m_bank_mask(0) + , m_sram_select_mask(0) + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override { } + virtual void device_reset() override ATTR_COLD; + +private: + static constexpr size_t BANK_SIZE = 0x4000; + + void mapper_write_6000(u8 data); + void mapper_write_7000(u8 data); + + memory_bank_array_creator<2> m_rombank; + memory_view m_view; + u8 m_bank_mask; + u8 m_sram_select_mask; +}; + +void msx_cart_ascii16_sram_device::device_reset() +{ + m_rombank[0]->set_entry(0); + m_view.select(0); + m_rombank[1]->set_entry(0); +} + +std::error_condition msx_cart_ascii16_sram_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_ascii16_sram_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + if (!cart_sram_region()) + { + message = "msx_cart_ascii16_sram_device: Required region 'sram' was not found."; + return image_error::INTERNAL; + } + + const u32 size = cart_rom_region()->bytes(); + const u16 banks = size / BANK_SIZE; + + if (size > 128 * BANK_SIZE || size != banks * BANK_SIZE || (~(banks - 1) % banks)) + { + message = "msx_cart_ascii16_sram_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + if (cart_sram_region()->bytes() < 0x800) + { + message = "msx_cart_ascii16_sram_device: Region 'sram' has unsupported size."; + return image_error::BADSOFTWARE; + } + + m_bank_mask = banks - 1; + m_sram_select_mask = banks; + + for (int i = 0; i < 2; i++) + m_rombank[i]->configure_entries(0, banks, cart_rom_region()->base(), BANK_SIZE); + + page(1)->install_read_bank(0x4000, 0x7fff, m_rombank[0]); + page(1)->install_write_handler(0x6000, 0x67ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii16_sram_device::mapper_write_6000))); + page(1)->install_write_handler(0x7000, 0x77ff, emu::rw_delegate(*this, FUNC(msx_cart_ascii16_sram_device::mapper_write_7000))); + page(2)->install_view(0x8000, 0xbfff, m_view); + m_view[0].install_read_bank(0x8000, 0xbfff, m_rombank[1]); + m_view[1].install_ram(0x8000, 0x87ff, 0x3800, cart_sram_region()->base()); + + return std::error_condition(); +} + +void msx_cart_ascii16_sram_device::mapper_write_6000(u8 data) +{ + m_rombank[0]->set_entry(data & m_bank_mask); +} + +void msx_cart_ascii16_sram_device::mapper_write_7000(u8 data) +{ + if (data & m_sram_select_mask) + { + m_view.select(1); + } + else + { + m_view.select(0); + m_rombank[1]->set_entry(data & m_bank_mask); + } +} + +} // anonymous namespace + +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ASCII8, msx_cart_interface, msx_cart_ascii8_device, "msx_cart_ascii8", "MSX Cartridge - ASCII8") +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ASCII16, msx_cart_interface, msx_cart_ascii16_device, "msx_cart_ascii16", "MSX Cartridge - ASCII16") +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ASCII8_SRAM, msx_cart_interface, msx_cart_ascii8_sram_device, "msx_cart_ascii8_sram", "MSX Cartridge - ASCII8 w/SRAM") +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ASCII16_SRAM, msx_cart_interface, msx_cart_ascii16_sram_device, "msx_cart_ascii16_sram", "MSX Cartridge - ASCII16 w/SRAM") |