diff options
Diffstat (limited to 'src/emu/bus/msx_cart/ascii.c')
-rw-r--r-- | src/emu/bus/msx_cart/ascii.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/src/emu/bus/msx_cart/ascii.c b/src/emu/bus/msx_cart/ascii.c new file mode 100644 index 00000000000..fa8d7a51d12 --- /dev/null +++ b/src/emu/bus/msx_cart/ascii.c @@ -0,0 +1,442 @@ +#include "emu.h" +#include "ascii.h" + + +const device_type MSX_CART_ASCII8 = &device_creator<msx_cart_ascii8>; +const device_type MSX_CART_ASCII16 = &device_creator<msx_cart_ascii16>; +const device_type MSX_CART_ASCII8_SRAM = &device_creator<msx_cart_ascii8_sram>; +const device_type MSX_CART_ASCII16_SRAM = &device_creator<msx_cart_ascii16_sram>; + + +msx_cart_ascii8::msx_cart_ascii8(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_ASCII8, "MSX Cartridge - ASCII8", tag, owner, clock, "msx_cart_ascii8", __FILE__) + , 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] = NULL; + } +} + + +void msx_cart_ascii8::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_ascii8::restore_banks), this)); +} + + +void msx_cart_ascii8::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_reset() +{ + for (int i = 0; i < 4; i++) + { + m_selected_bank[i] = 0; + } +} + + +void msx_cart_ascii8::initialize_cartridge() +{ + UINT32 size = get_rom_size(); + + if ( size > 256 * 0x2000 ) + { + fatalerror("ascii8: ROM is too big\n"); + } + + UINT16 banks = size / 0x2000; + + if (size != banks * 0x2000 || (~(banks - 1) % banks)) + { + fatalerror("ascii8: Invalid ROM size\n"); + } + + m_bank_mask = banks - 1; + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_ascii8::read_cart) +{ + if ( offset >= 0x4000 && offset < 0xC000 ) + { + return m_bank_base[(offset - 0x4000) >> 13][offset & 0x1fff]; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_ascii8::write_cart) +{ + if (offset >= 0x6000 && offset < 0x8000) + { + UINT8 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::msx_cart_ascii16(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_ASCII16, "MSX Cartridge - ASCII16", tag, owner, clock, "msx_cart_ascii16", __FILE__) + , 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] = NULL; + } +} + + +void msx_cart_ascii16::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_ascii16::restore_banks), this)); +} + + +void msx_cart_ascii16::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_reset() +{ + for (int i = 0; i < 2; i++) + { + m_selected_bank[i] = 0; + } +} + + +void msx_cart_ascii16::initialize_cartridge() +{ + UINT32 size = get_rom_size(); + + if ( size > 256 * 0x4000 ) + { + fatalerror("ascii16: ROM is too big\n"); + } + + UINT16 banks = size / 0x4000; + + if (size != banks * 0x4000 || (~(banks - 1) % banks)) + { + fatalerror("ascii16: Invalid ROM size\n"); + } + + m_bank_mask = banks - 1; + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_ascii16::read_cart) +{ + if ( offset >= 0x4000 && offset < 0xC000 ) + { + return m_bank_base[offset >> 15][offset & 0x3fff]; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_ascii16::write_cart) +{ + 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::msx_cart_ascii8_sram(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_ASCII8_SRAM, "MSX Cartridge - ASCII8 w/SRAM", tag, owner, clock, "msx_cart_ascii8_sram", __FILE__) + , 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] = NULL; + } +} + + +void msx_cart_ascii8_sram::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_ascii8_sram::restore_banks), this)); +} + + +void msx_cart_ascii8_sram::setup_bank(UINT8 bank) +{ + if (m_selected_bank[bank] & ~(m_sram_select_mask | m_bank_mask)) + { + // Nothing is mapped + m_bank_base[bank] = NULL; + } + 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::restore_banks() +{ + for (int i = 0; i < 4; i++) + { + setup_bank(i); + } +} + + +void msx_cart_ascii8_sram::device_reset() +{ + for (int i = 0; i < 4; i++) + { + m_selected_bank[i] = 0; + } +} + + +void msx_cart_ascii8_sram::initialize_cartridge() +{ + UINT32 size = get_rom_size(); + + if ( size > 128 * 0x2000 ) + { + fatalerror("ascii8_sram: ROM is too big\n"); + } + + UINT16 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(); +} + + +READ8_MEMBER(msx_cart_ascii8_sram::read_cart) +{ + if ( offset >= 0x4000 && offset < 0xC000 ) + { + UINT8 *bank_base = m_bank_base[(offset - 0x4000) >> 13]; + + if (bank_base != NULL) + { + return bank_base[offset & 0x1fff]; + } + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_ascii8_sram::write_cart) +{ + if (offset >= 0x6000 && offset < 0x8000) + { + UINT8 bank = (offset / 0x800) & 0x03; + + m_selected_bank[bank] = data; + setup_bank(bank); + } + else if (offset >= 0x8000 && offset < 0xc000) + { + UINT8 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::msx_cart_ascii16_sram(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_ASCII16_SRAM, "MSX Cartridge - ASCII16 w/SRAM", tag, owner, clock, "msx_cart_ascii16_sram", __FILE__) + , 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] = NULL; + } +} + + +void msx_cart_ascii16_sram::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_ascii16_sram::restore_banks), this)); +} + + +void msx_cart_ascii16_sram::setup_bank(UINT8 bank) +{ + if (m_selected_bank[bank] & ~(m_sram_select_mask | m_bank_mask)) + { + // Nothing is mapped + m_bank_base[bank] = NULL; + } + 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::restore_banks() +{ + for (int i = 0; i < 2; i++) + { + setup_bank(i); + } +} + + +void msx_cart_ascii16_sram::device_reset() +{ + for (int i = 0; i < 2; i++) + { + m_selected_bank[i] = 0; + } +} + + +void msx_cart_ascii16_sram::initialize_cartridge() +{ + UINT32 size = get_rom_size(); + + if ( size > 128 * 0x4000 ) + { + fatalerror("ascii16_sram: ROM is too big\n"); + } + + UINT16 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(); +} + + +READ8_MEMBER(msx_cart_ascii16_sram::read_cart) +{ + if ( offset >= 0x4000 && offset < 0xC000 ) + { + UINT8 bank = offset >> 15; + + if (m_bank_base[bank] != NULL) + { + 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; +} + + +WRITE8_MEMBER(msx_cart_ascii16_sram::write_cart) +{ + 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; + } + } +} + |