diff options
Diffstat (limited to 'src/emu/bus/scv/rom.c')
-rw-r--r-- | src/emu/bus/scv/rom.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/emu/bus/scv/rom.c b/src/emu/bus/scv/rom.c new file mode 100644 index 00000000000..39d33a86ee8 --- /dev/null +++ b/src/emu/bus/scv/rom.c @@ -0,0 +1,203 @@ +/*********************************************************************************************************** + + + Epoch Super Cassette Vision cart emulation + + + ***********************************************************************************************************/ + + +#include "emu.h" +#include "rom.h" + + +//------------------------------------------------- +// scv_rom_device - constructor +//------------------------------------------------- + +const device_type SCV_ROM8K = &device_creator<scv_rom8_device>; +const device_type SCV_ROM16K = &device_creator<scv_rom16_device>; +const device_type SCV_ROM32K = &device_creator<scv_rom32_device>; +const device_type SCV_ROM32K_RAM8K = &device_creator<scv_rom32ram8_device>; +const device_type SCV_ROM64K = &device_creator<scv_rom64_device>; +const device_type SCV_ROM128K = &device_creator<scv_rom128_device>; +const device_type SCV_ROM128K_RAM4K = &device_creator<scv_rom128ram4_device>; + + +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__) +{ +} + +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__) +{ +} + +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__) +{ +} + +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__) +{ +} + + +//------------------------------------------------- +// 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); +} |