// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*********************************************************************************************************** Epoch Super Cassette Vision cart emulation ***********************************************************************************************************/ #include "emu.h" #include "rom.h" //------------------------------------------------- // scv_rom_device - constructor //------------------------------------------------- DEFINE_DEVICE_TYPE(SCV_ROM8K, scv_rom8_device, "scv_rom8", "SCV 8K Carts") DEFINE_DEVICE_TYPE(SCV_ROM16K, scv_rom16_device, "scv_rom16", "SCV 16K Carts") DEFINE_DEVICE_TYPE(SCV_ROM32K, scv_rom32_device, "scv_rom32", "SCV 32K Carts") DEFINE_DEVICE_TYPE(SCV_ROM32K_RAM8K, scv_rom32ram8_device, "scv_rom32_ram8", "SCV 32K + RAM 8K Carts") DEFINE_DEVICE_TYPE(SCV_ROM64K, scv_rom64_device, "scv_rom64", "SCV 64K Carts") DEFINE_DEVICE_TYPE(SCV_ROM128K, scv_rom128_device, "scv_rom128", "SCV 128K Carts") DEFINE_DEVICE_TYPE(SCV_ROM128K_RAM4K, scv_rom128ram4_device, "scv_rom128_ram4", "SCV 128K + RAM 4K Carts") scv_rom8_device::scv_rom8_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, type, tag, owner, clock), device_scv_cart_interface(mconfig, *this) { } scv_rom8_device::scv_rom8_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM8K, tag, owner, clock) { } scv_rom16_device::scv_rom16_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM16K, tag, owner, clock) { } scv_rom32_device::scv_rom32_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM32K, tag, owner, clock) { } scv_rom32ram8_device::scv_rom32ram8_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM32K_RAM8K, tag, owner, clock), m_ram_enabled(0) { } scv_rom64_device::scv_rom64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM64K, tag, owner, clock), m_bank_base(0) { } scv_rom128_device::scv_rom128_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM128K, tag, owner, clock), m_bank_base(0) { } scv_rom128ram4_device::scv_rom128ram4_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : scv_rom8_device(mconfig, SCV_ROM128K_RAM4K, tag, owner, clock), m_bank_base(0), m_ram_enabled(0) { } //------------------------------------------------- // mapper specific start/reset //------------------------------------------------- void scv_rom32ram8_device::device_start() { save_item(NAME(m_ram_enabled)); } void scv_rom32ram8_device::device_reset() { m_ram_enabled = 1; } void scv_rom64_device::device_start() { save_item(NAME(m_bank_base)); } void scv_rom64_device::device_reset() { m_bank_base = 0; } void scv_rom128_device::device_start() { save_item(NAME(m_bank_base)); } void scv_rom128_device::device_reset() { m_bank_base = 0; } void scv_rom128ram4_device::device_start() { save_item(NAME(m_bank_base)); save_item(NAME(m_ram_enabled)); } void scv_rom128ram4_device::device_reset() { m_bank_base = 0; m_ram_enabled = 1; } /*------------------------------------------------- mapper specific handlers -------------------------------------------------*/ uint8_t scv_rom8_device::read_cart(offs_t offset) { return m_rom[offset & 0x1fff]; } uint8_t scv_rom16_device::read_cart(offs_t offset) { return m_rom[offset & 0x3fff]; } uint8_t scv_rom32_device::read_cart(offs_t offset) { return m_rom[offset]; } uint8_t scv_rom32ram8_device::read_cart(offs_t offset) { if (m_ram_enabled && offset >= 0x6000) return m_ram[offset & 0x1fff]; return m_rom[offset]; } void scv_rom32ram8_device::write_cart(offs_t offset, uint8_t data) { if (m_ram_enabled && offset >= 0x6000) m_ram[offset & 0x1fff] = data; } void scv_rom32ram8_device::write_bank(uint8_t data) { m_ram_enabled = BIT(data, 5); } uint8_t scv_rom64_device::read_cart(offs_t offset) { return m_rom[offset + (m_bank_base * 0x8000)]; } void scv_rom64_device::write_bank(uint8_t data) { m_bank_base = BIT(data, 5); } uint8_t scv_rom128_device::read_cart(offs_t offset) { return m_rom[offset + (m_bank_base * 0x8000)]; } void scv_rom128_device::write_bank(uint8_t data) { m_bank_base = (data >> 5) & 0x03; } uint8_t scv_rom128ram4_device::read_cart(offs_t offset) { if (m_ram_enabled && offset >= 0x7000) return m_ram[offset & 0xfff]; return m_rom[offset + (m_bank_base * 0x8000)]; } void scv_rom128ram4_device::write_cart(offs_t offset, uint8_t data) { if (m_ram_enabled && offset >= 0x7000) m_ram[offset & 0xfff] = data; } void scv_rom128ram4_device::write_bank(uint8_t data) { m_bank_base = (data >> 5) & 0x03; m_ram_enabled = BIT(data, 6); }