// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "ascii.h" DEFINE_DEVICE_TYPE(MSX_CART_ASCII8, msx_cart_ascii8_device, "msx_cart_ascii8", "MSX Cartridge - ASCII8") DEFINE_DEVICE_TYPE(MSX_CART_ASCII16, msx_cart_ascii16_device, "msx_cart_ascii16", "MSX Cartridge - ASCII16") DEFINE_DEVICE_TYPE(MSX_CART_ASCII8_SRAM, msx_cart_ascii8_sram_device, "msx_cart_ascii8_sram", "MSX Cartridge - ASCII8 w/SRAM") DEFINE_DEVICE_TYPE(MSX_CART_ASCII16_SRAM, msx_cart_ascii16_sram_device, "msx_cart_ascii16_sram", "MSX Cartridge - ASCII16 w/SRAM") DEFINE_DEVICE_TYPE(MSX_CART_MSXWRITE, msx_cart_msxwrite_device, "msx_cart_msxwrite", "MSX Cartridge - MSXWRITE") msx_cart_ascii8_device::msx_cart_ascii8_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_ASCII8, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_bank_mask(0) { for (int i = 0; i < 4; i++) { m_selected_bank[i] = 0; m_bank_base[i] = nullptr; } } void msx_cart_ascii8_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_ascii8_device::device_post_load() { restore_banks(); } void msx_cart_ascii8_device::restore_banks() { for (int i = 0; i < 4; i++) { m_bank_base[i] = get_rom_base() + (m_selected_bank[i] & m_bank_mask ) * 0x2000; } } void msx_cart_ascii8_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_ascii8_device::initialize_cartridge() { uint32_t size = get_rom_size(); if ( size > 256 * 0x2000 ) { fatalerror("ascii8: ROM is too big\n"); } uint16_t banks = size / 0x2000; if (size != banks * 0x2000 || (~(banks - 1) % banks)) { fatalerror("ascii8: Invalid ROM size\n"); } m_bank_mask = banks - 1; restore_banks(); } uint8_t msx_cart_ascii8_device::read_cart(offs_t offset) { if ( offset >= 0x4000 && offset < 0xC000 ) { return m_bank_base[(offset - 0x4000) >> 13][offset & 0x1fff]; } return 0xff; } void msx_cart_ascii8_device::write_cart(offs_t offset, uint8_t data) { if (offset >= 0x6000 && offset < 0x8000) { uint8_t bank = (offset / 0x800) & 0x03; m_selected_bank[bank] = data; m_bank_base[bank] = get_rom_base() + (m_selected_bank[bank] & m_bank_mask ) * 0x2000; } } msx_cart_ascii16_device::msx_cart_ascii16_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_ASCII16, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_bank_mask(0) { for (int i = 0; i < 2; i++) { m_selected_bank[i] = 0; m_bank_base[i] = nullptr; } } void msx_cart_ascii16_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_ascii16_device::device_post_load() { restore_banks(); } void msx_cart_ascii16_device::restore_banks() { for (int i = 0; i < 2; i++) { m_bank_base[i] = get_rom_base() + (m_selected_bank[i] & m_bank_mask) * 0x4000; } } void msx_cart_ascii16_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_ascii16_device::initialize_cartridge() { uint32_t size = get_rom_size(); if ( size > 256 * 0x4000 ) { fatalerror("ascii16: ROM is too big\n"); } uint16_t banks = size / 0x4000; if (size != banks * 0x4000 || (~(banks - 1) % banks)) { fatalerror("ascii16: Invalid ROM size\n"); } m_bank_mask = banks - 1; restore_banks(); } uint8_t msx_cart_ascii16_device::read_cart(offs_t offset) { if ( offset >= 0x4000 && offset < 0xC000 ) { return m_bank_base[offset >> 15][offset & 0x3fff]; } return 0xff; } void msx_cart_ascii16_device::write_cart(offs_t offset, uint8_t data) { if (offset >= 0x6000 && offset < 0x6800) { m_selected_bank[0] = data; m_bank_base[0] = get_rom_base() + (m_selected_bank[0] & m_bank_mask) * 0x4000; } if (offset >= 0x7000 && offset < 0x7800) { m_selected_bank[1] = data; m_bank_base[1] = get_rom_base() + (m_selected_bank[1] & m_bank_mask) * 0x4000; } } msx_cart_ascii8_sram_device::msx_cart_ascii8_sram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_ASCII8_SRAM, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_bank_mask(0) , m_sram_select_mask(0) { for (int i = 0; i < 4; i++) { m_selected_bank[i] = 0; m_bank_base[i] = nullptr; } } void msx_cart_ascii8_sram_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_ascii8_sram_device::device_post_load() { restore_banks(); } void msx_cart_ascii8_sram_device::setup_bank(uint8_t bank) { if (m_selected_bank[bank] & ~(m_sram_select_mask | m_bank_mask)) { // Nothing is mapped m_bank_base[bank] = nullptr; } else if (m_selected_bank[bank] & m_sram_select_mask) { // SRAM is selected m_bank_base[bank] = get_sram_base(); } else { m_bank_base[bank] = get_rom_base() + (m_selected_bank[bank] & m_bank_mask ) * 0x2000; } } void msx_cart_ascii8_sram_device::restore_banks() { for (int i = 0; i < 4; i++) { setup_bank(i); } } void msx_cart_ascii8_sram_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_ascii8_sram_device::initialize_cartridge() { uint32_t size = get_rom_size(); if ( size > 128 * 0x2000 ) { fatalerror("ascii8_sram: ROM is too big\n"); } uint16_t banks = size / 0x2000; if (size != banks * 0x2000 || (~(banks - 1) % banks)) { fatalerror("ascii8_sram: Invalid ROM size\n"); } if (get_sram_size() != 0x2000) { fatalerror("ascii8_sram: Unsupported SRAM size\n"); } m_bank_mask = banks - 1; m_sram_select_mask = banks; restore_banks(); } uint8_t msx_cart_ascii8_sram_device::read_cart(offs_t offset) { if ( offset >= 0x4000 && offset < 0xC000 ) { uint8_t *bank_base = m_bank_base[(offset - 0x4000) >> 13]; if (bank_base != nullptr) { return bank_base[offset & 0x1fff]; } } return 0xff; } void msx_cart_ascii8_sram_device::write_cart(offs_t offset, uint8_t data) { if (offset >= 0x6000 && offset < 0x8000) { uint8_t bank = (offset / 0x800) & 0x03; m_selected_bank[bank] = data; setup_bank(bank); } else if (offset >= 0x8000 && offset < 0xc000) { uint8_t bank = (offset & 0x2000) ? 3 : 2; if ((m_selected_bank[bank] & m_sram_select_mask) && !(m_selected_bank[bank] & ~(m_sram_select_mask | m_bank_mask))) { // Write to SRAM m_bank_base[bank][offset & 0x1fff] = data; } } } msx_cart_ascii16_sram_device::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_bank_mask(0) , m_sram_select_mask(0) { for (int i = 0; i < 2; i++) { m_selected_bank[i] = 0; m_bank_base[i] = nullptr; } } void msx_cart_ascii16_sram_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_ascii16_sram_device::device_post_load() { restore_banks(); } void msx_cart_ascii16_sram_device::setup_bank(uint8_t bank) { if (m_selected_bank[bank] & ~(m_sram_select_mask | m_bank_mask)) { // Nothing is mapped m_bank_base[bank] = nullptr; } else if (m_selected_bank[bank] & m_sram_select_mask) { // SRAM is selected m_bank_base[bank] = get_sram_base(); } else { m_bank_base[bank] = get_rom_base() + (m_selected_bank[bank] & m_bank_mask) * 0x4000; } } void msx_cart_ascii16_sram_device::restore_banks() { for (int i = 0; i < 2; i++) { setup_bank(i); } } void msx_cart_ascii16_sram_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_ascii16_sram_device::initialize_cartridge() { uint32_t size = get_rom_size(); if ( size > 128 * 0x4000 ) { fatalerror("ascii16_sram: ROM is too big\n"); } uint16_t banks = size / 0x4000; if (size != banks * 0x4000 || (~(banks - 1) % banks)) { fatalerror("ascii16_sram: Invalid ROM size\n"); } if (get_sram_size() != 0x800) { fatalerror("ascii16_sram: Unsupported SRAM size\n"); } m_bank_mask = banks - 1; m_sram_select_mask = banks; restore_banks(); } uint8_t msx_cart_ascii16_sram_device::read_cart(offs_t offset) { if ( offset >= 0x4000 && offset < 0xC000 ) { uint8_t bank = offset >> 15; if (m_bank_base[bank] != nullptr) { if (m_selected_bank[bank] & m_sram_select_mask) { return m_bank_base[bank][offset & 0x7ff]; } else { return m_bank_base[bank][offset & 0x3fff]; } } } return 0xff; } void msx_cart_ascii16_sram_device::write_cart(offs_t offset, uint8_t data) { if (offset >= 0x6000 && offset < 0x6800) { m_selected_bank[0] = data; setup_bank(0); } if (offset >= 0x7000 && offset < 0x7800) { m_selected_bank[1] = data; setup_bank(1); } if (offset >= 0x8000 && offset < 0xc000) { if ((m_selected_bank[1] & m_sram_select_mask) && !(m_selected_bank[1] & ~(m_sram_select_mask | m_bank_mask))) { // Write to SRAM m_bank_base[1][offset & 0x7ff] = data; } } } msx_cart_msxwrite_device::msx_cart_msxwrite_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_MSXWRITE, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_bank_mask(0) { for (int i = 0; i < 2; i++) { m_selected_bank[i] = 0; m_bank_base[i] = nullptr; } } void msx_cart_msxwrite_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_msxwrite_device::device_post_load() { restore_banks(); } void msx_cart_msxwrite_device::restore_banks() { for (int i = 0; i < 2; i++) { m_bank_base[i] = get_rom_base() + (m_selected_bank[i] & m_bank_mask) * 0x4000; } } void msx_cart_msxwrite_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_msxwrite_device::initialize_cartridge() { uint32_t size = get_rom_size(); if ( size > 256 * 0x4000 ) { fatalerror("msxwrite: ROM is too big\n"); } uint16_t banks = size / 0x4000; if (size != banks * 0x4000 || (~(banks - 1) % banks)) { fatalerror("msxwrite: Invalid ROM size\n"); } m_bank_mask = banks - 1; restore_banks(); } uint8_t msx_cart_msxwrite_device::read_cart(offs_t offset) { if ( offset >= 0x4000 && offset < 0xC000 ) { return m_bank_base[offset >> 15][offset & 0x3fff]; } return 0xff; } void msx_cart_msxwrite_device::write_cart(offs_t offset, uint8_t data) { // The rom writes to 6fff and 7fff for banking, unknown whether // other locations also trigger banking. switch (offset) { case 0x6fff: m_selected_bank[0] = data; m_bank_base[0] = get_rom_base() + (m_selected_bank[0] & m_bank_mask) * 0x4000; break; case 0x7fff: m_selected_bank[1] = data; m_bank_base[1] = get_rom_base() + (m_selected_bank[1] & m_bank_mask) * 0x4000; break; } }