// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*********************************************************************************************************** Epoch Super Cassette Vision cart emulation ***********************************************************************************************************/ #include "emu.h" #include "rom.h" //------------------------------------------------- // scv_rom_device - constructor //------------------------------------------------- const device_type SCV_ROM8K = &device_creator; const device_type SCV_ROM16K = &device_creator; const device_type SCV_ROM32K = &device_creator; const device_type SCV_ROM32K_RAM8K = &device_creator; const device_type SCV_ROM64K = &device_creator; const device_type SCV_ROM128K = &device_creator; const device_type SCV_ROM128K_RAM4K = &device_creator; scv_rom8_device::scv_rom8_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : device_t(mconfig, type, name, tag, owner, clock, shortname, source), device_scv_cart_interface( mconfig, *this ) { } scv_rom8_device::scv_rom8_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, SCV_ROM8K, "SCV 8K Carts", tag, owner, clock, "scv_rom8", __FILE__), device_scv_cart_interface( mconfig, *this ) { } scv_rom16_device::scv_rom16_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM16K, "SCV 16K Carts", tag, owner, clock, "scv_rom16", __FILE__) { } scv_rom32_device::scv_rom32_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM32K, "SCV 32K Carts", tag, owner, clock, "scv_rom32", __FILE__) { } scv_rom32ram8_device::scv_rom32ram8_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM32K_RAM8K, "SCV 32K + RAM 8K Carts", tag, owner, clock, "scv_rom32_ram8", __FILE__), m_ram_enabled(0) { } scv_rom64_device::scv_rom64_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM16K, "SCV 64K Carts", tag, owner, clock, "scv_rom64", __FILE__), m_bank_base(0) { } scv_rom128_device::scv_rom128_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM32K, "SCV 128K Carts", tag, owner, clock, "scv_rom128", __FILE__), m_bank_base(0) { } scv_rom128ram4_device::scv_rom128ram4_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : scv_rom8_device(mconfig, SCV_ROM128K_RAM4K, "SCV 128K + RAM 4K Carts", tag, owner, clock, "scv_rom128_ram4", __FILE__), 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 -------------------------------------------------*/ READ8_MEMBER(scv_rom8_device::read_cart) { return m_rom[offset & 0x1fff]; } READ8_MEMBER(scv_rom16_device::read_cart) { return m_rom[offset & 0x3fff]; } READ8_MEMBER(scv_rom32_device::read_cart) { return m_rom[offset]; } READ8_MEMBER(scv_rom32ram8_device::read_cart) { if (m_ram_enabled && offset >= 0x6000) return m_ram[offset & 0x1fff]; return m_rom[offset]; } WRITE8_MEMBER(scv_rom32ram8_device::write_cart) { if (m_ram_enabled && offset >= 0x6000) m_ram[offset & 0x1fff] = data; } WRITE8_MEMBER(scv_rom32ram8_device::write_bank) { m_ram_enabled = BIT(data, 5); } READ8_MEMBER(scv_rom64_device::read_cart) { return m_rom[offset + (m_bank_base * 0x8000)]; } WRITE8_MEMBER(scv_rom64_device::write_bank) { m_bank_base = BIT(data, 5); } READ8_MEMBER(scv_rom128_device::read_cart) { return m_rom[offset + (m_bank_base * 0x8000)]; } WRITE8_MEMBER(scv_rom128_device::write_bank) { m_bank_base = (data >> 5) & 0x03; } READ8_MEMBER(scv_rom128ram4_device::read_cart) { if (m_ram_enabled && offset >= 0x7000) return m_ram[offset & 0xfff]; return m_rom[offset + (m_bank_base * 0x8000)]; } WRITE8_MEMBER(scv_rom128ram4_device::write_cart) { if (m_ram_enabled && offset >= 0x7000) m_ram[offset & 0xfff] = data; } WRITE8_MEMBER(scv_rom128ram4_device::write_bank) { m_bank_base = (data >> 5) & 0x03; m_ram_enabled = BIT(data, 6); }