diff options
Diffstat (limited to 'src/emu/bus/scv/slot.c')
-rw-r--r-- | src/emu/bus/scv/slot.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/src/emu/bus/scv/slot.c b/src/emu/bus/scv/slot.c new file mode 100644 index 00000000000..1696051b013 --- /dev/null +++ b/src/emu/bus/scv/slot.c @@ -0,0 +1,318 @@ +/*********************************************************************************************************** + + Epoch Super Cassette Vision cart emulation + (through slot devices) + + ***********************************************************************************************************/ + + +#include "emu.h" +#include "slot.h" + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type SCV_CART_SLOT = &device_creator<scv_cart_slot_device>; + +//************************************************************************** +// SCV cartridges Interface +//************************************************************************** + +//------------------------------------------------- +// device_scv_cart_interface - constructor +//------------------------------------------------- + +device_scv_cart_interface::device_scv_cart_interface(const machine_config &mconfig, device_t &device) + : device_slot_card_interface(mconfig, device), + m_rom(NULL), + m_rom_size(0) +{ +} + + +//------------------------------------------------- +// ~device_scv_cart_interface - destructor +//------------------------------------------------- + +device_scv_cart_interface::~device_scv_cart_interface() +{ +} + +//------------------------------------------------- +// rom_alloc - alloc the space for the cart +//------------------------------------------------- + +void device_scv_cart_interface::rom_alloc(UINT32 size, const char *tag) +{ + if (m_rom == NULL) + { + astring tempstring(tag); + tempstring.cat(SCVSLOT_ROM_REGION_TAG); + m_rom = device().machine().memory().region_alloc(tempstring, size, 1, ENDIANNESS_LITTLE)->base(); + m_rom_size = size; + } +} + + +//------------------------------------------------- +// ram_alloc - alloc the space for the ram +//------------------------------------------------- + +void device_scv_cart_interface::ram_alloc(UINT32 size) +{ + m_ram.resize(size); +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// scv_cart_slot_device - constructor +//------------------------------------------------- +scv_cart_slot_device::scv_cart_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, SCV_CART_SLOT, "SCV Cartridge Slot", tag, owner, clock, "scv_cart_slot", __FILE__), + device_image_interface(mconfig, *this), + device_slot_interface(mconfig, *this), + m_type(SCV_8K) +{ +} + + +//------------------------------------------------- +// scv_cart_slot_device - destructor +//------------------------------------------------- + +scv_cart_slot_device::~scv_cart_slot_device() +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void scv_cart_slot_device::device_start() +{ + m_cart = dynamic_cast<device_scv_cart_interface *>(get_card_device()); +} + +//------------------------------------------------- +// device_config_complete - perform any +// operations now that the configuration is +// complete +//------------------------------------------------- + +void scv_cart_slot_device::device_config_complete() +{ + // set brief and instance name + update_names(); +} + + +//------------------------------------------------- +// SCV PCB +//------------------------------------------------- + +struct scv_slot +{ + int pcb_id; + const char *slot_option; +}; + +// Here, we take the feature attribute from .xml (i.e. the PCB name) and we assign a unique ID to it +static const scv_slot slot_list[] = +{ + { SCV_8K, "rom8k" }, + { SCV_16K, "rom16k" }, + { SCV_32K, "rom32k" }, + { SCV_32K_RAM, "rom32k_ram" }, + { SCV_64K, "rom64k" }, + { SCV_128K, "rom128k" }, + { SCV_128K_RAM, "rom128k_ram" } +}; + +static int scv_get_pcb_id(const char *slot) +{ + for (int i = 0; i < ARRAY_LENGTH(slot_list); i++) + { + if (!core_stricmp(slot_list[i].slot_option, slot)) + return slot_list[i].pcb_id; + } + + return 0; +} + +static const char *scv_get_slot(int type) +{ + for (int i = 0; i < ARRAY_LENGTH(slot_list); i++) + { + if (slot_list[i].pcb_id == type) + return slot_list[i].slot_option; + } + + return "rom8k"; +} + + +/*------------------------------------------------- + call load + -------------------------------------------------*/ + +bool scv_cart_slot_device::call_load() +{ + if (m_cart) + { + UINT8 *ROM; + UINT32 len = (software_entry() == NULL) ? length() : get_software_region_length("rom"); + bool has_ram = (software_entry() != NULL) && get_software_region("ram"); + + if (len > 0x20000) + { + seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size"); + return IMAGE_INIT_FAIL; + } + + m_cart->rom_alloc(len, tag()); + if (has_ram) + m_cart->ram_alloc(get_software_region_length("ram")); + + ROM = m_cart->get_rom_base(); + + if (software_entry() == NULL) + fread(ROM, len); + else + memcpy(ROM, get_software_region("rom"), len); + + if (software_entry() == NULL) + m_type = get_cart_type(ROM, len); + else + { + const char *pcb_name = get_feature("slot"); + if (pcb_name) + m_type = scv_get_pcb_id(pcb_name); + } + + // for the moment we only support RAM from softlist and in the following configurations + // 1) 32K ROM + 8K RAM; 2) 128K ROM + 4K RAM + if (m_type == SCV_32K && has_ram) + m_type = SCV_32K_RAM; + if (m_type == SCV_128K && has_ram) + m_type = SCV_128K_RAM; + + //printf("Type: %s\n", scv_get_slot(m_type)); + + return IMAGE_INIT_PASS; + } + + return IMAGE_INIT_PASS; +} + + +/*------------------------------------------------- + call softlist load + -------------------------------------------------*/ + +bool scv_cart_slot_device::call_softlist_load(software_list_device &swlist, const char *swname, const rom_entry *start_entry) +{ + load_software_part_region(*this, swlist, swname, start_entry); + return TRUE; +} + + + +/*------------------------------------------------- + get_cart_type - code to detect NVRAM type from + fullpath + -------------------------------------------------*/ + +int scv_cart_slot_device::get_cart_type(UINT8 *ROM, UINT32 len) +{ + int type = SCV_8K; + + // TO DO: is there any way to identify carts with RAM?!? + switch (len) + { + case 0x2000: + type = SCV_8K; + break; + case 0x4000: + type = SCV_16K; + break; + case 0x8000: + type = SCV_32K; + break; + case 0x10000: + type = SCV_64K; + break; + case 0x20000: + type = SCV_128K; + break; + } + + return type; +} + + +/*------------------------------------------------- + get default card software + -------------------------------------------------*/ + +void scv_cart_slot_device::get_default_card_software(astring &result) +{ + if (open_image_file(mconfig().options())) + { + const char *slot_string = "rom8k"; + UINT32 len = core_fsize(m_file); + dynamic_buffer rom(len); + int type; + + core_fread(m_file, rom, len); + + type = get_cart_type(rom, len); + slot_string = scv_get_slot(type); + + //printf("type: %s\n", slot_string); + clear(); + + result.cpy(slot_string); + return; + } + + software_get_default_slot(result, "rom8k"); +} + +/*------------------------------------------------- + read + -------------------------------------------------*/ + +READ8_MEMBER(scv_cart_slot_device::read_cart) +{ + if (m_cart) + return m_cart->read_cart(space, offset); + else + return 0xff; +} + +/*------------------------------------------------- + write + -------------------------------------------------*/ + +WRITE8_MEMBER(scv_cart_slot_device::write_cart) +{ + if (m_cart) + m_cart->write_cart(space, offset, data); +} + + +/*------------------------------------------------- + write_bank + -------------------------------------------------*/ + +WRITE8_MEMBER(scv_cart_slot_device::write_bank) +{ + if (m_cart) + m_cart->write_bank(space, offset, data); +} + |