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Diffstat (limited to 'src/devices/bus/pce/pce_slot.cpp')
-rw-r--r-- | src/devices/bus/pce/pce_slot.cpp | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/src/devices/bus/pce/pce_slot.cpp b/src/devices/bus/pce/pce_slot.cpp new file mode 100644 index 00000000000..bc124852c0c --- /dev/null +++ b/src/devices/bus/pce/pce_slot.cpp @@ -0,0 +1,395 @@ +// license:BSD-3-Clause +// copyright-holders:Fabio Priuli +/*********************************************************************************************************** + + + PC-Engine / Turbografx-16 cart emulation + (through slot devices) + + TODO: + - reimplement cart mirroring in a better way + + ***********************************************************************************************************/ + + +#include "emu.h" +#include "pce_slot.h" + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type PCE_CART_SLOT = &device_creator<pce_cart_slot_device>; + +//************************************************************************** +// PCE cartridges Interface +//************************************************************************** + +//------------------------------------------------- +// device_pce_cart_interface - constructor +//------------------------------------------------- + +device_pce_cart_interface::device_pce_cart_interface(const machine_config &mconfig, device_t &device) + : device_slot_card_interface(mconfig, device), + m_rom(NULL), + m_rom_size(0) +{ +} + + +//------------------------------------------------- +// ~device_pce_cart_interface - destructor +//------------------------------------------------- + +device_pce_cart_interface::~device_pce_cart_interface() +{ +} + +//------------------------------------------------- +// rom_alloc - alloc the space for the cart +//------------------------------------------------- + +void device_pce_cart_interface::rom_alloc(UINT32 size, const char *tag) +{ + if (m_rom == NULL) + { + m_rom = device().machine().memory().region_alloc(std::string(tag).append(PCESLOT_ROM_REGION_TAG).c_str(), size, 1, ENDIANNESS_LITTLE)->base(); + m_rom_size = size; + } +} + + +//------------------------------------------------- +// ram_alloc - alloc the space for the ram +//------------------------------------------------- + +void device_pce_cart_interface::ram_alloc(UINT32 size) +{ + m_ram.resize(size); + device().save_item(NAME(m_ram)); +} + +//------------------------------------------------- +// rom_map_setup - setup map of rom banks in 128K +// blocks, so to simplify ROM access to mirror +//------------------------------------------------- + +void device_pce_cart_interface::rom_map_setup(UINT32 size) +{ + if (size == 0x60000) + { + // HuCard 384K are mapped with mirrored pieces + rom_bank_map[0] = 0; + rom_bank_map[1] = 1; + rom_bank_map[2] = 0; + rom_bank_map[3] = 1; + rom_bank_map[4] = 2; + rom_bank_map[5] = 2; + rom_bank_map[6] = 2; + rom_bank_map[7] = 2; + } + else if (size == 0x30000) + { + // 192K images (some demos) + rom_bank_map[0] = 0; + rom_bank_map[1] = 1; + rom_bank_map[2] = 2; + rom_bank_map[3] = 2; + rom_bank_map[4] = 0; + rom_bank_map[5] = 1; + rom_bank_map[6] = 2; + rom_bank_map[7] = 2; + } + else + { + int i; + + // setup the rom_bank_map array to faster ROM read + for (i = 0; i < size / 0x20000 && i < 8; i++) + rom_bank_map[i] = i; + + // fill up remaining blocks with mirrors + while (i % 8) + { + int j = 0, repeat_banks; + while ((i % (8 >> j)) && j < 3) + j++; + repeat_banks = i % (8 >> (j - 1)); + for (int k = 0; k < repeat_banks; k++) + rom_bank_map[i + k] = rom_bank_map[i + k - repeat_banks]; + i += repeat_banks; + } + } + // check bank map! +// for (i = 0; i < 8; i++) +// { +// printf("bank %3d = %3d\t", i, rom_bank_map[i]); +// } +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// pce_cart_slot_device - constructor +//------------------------------------------------- +pce_cart_slot_device::pce_cart_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, PCE_CART_SLOT, "PCE & TG16 Cartridge Slot", tag, owner, clock, "pce_cart_slot", __FILE__), + device_image_interface(mconfig, *this), + device_slot_interface(mconfig, *this), + m_interface("pce_cart"), + m_type(PCE_STD) +{ +} + + +//------------------------------------------------- +// pce_cart_slot_device - destructor +//------------------------------------------------- + +pce_cart_slot_device::~pce_cart_slot_device() +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void pce_cart_slot_device::device_start() +{ + m_cart = dynamic_cast<device_pce_cart_interface *>(get_card_device()); +} + +//------------------------------------------------- +// device_config_complete - perform any +// operations now that the configuration is +// complete +//------------------------------------------------- + +void pce_cart_slot_device::device_config_complete() +{ + // set brief and instance name + update_names(); +} + + +//------------------------------------------------- +// PCE PCB +//------------------------------------------------- + +struct pce_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 pce_slot slot_list[] = +{ + { PCE_STD, "rom" }, + { PCE_CDSYS3U, "cdsys3u" }, + { PCE_CDSYS3J, "cdsys3j" }, + { PCE_POPULOUS, "populous" }, + { PCE_SF2, "sf2" }, +}; + +static int pce_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 *pce_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 "rom"; +} + + +/*------------------------------------------------- + call load + -------------------------------------------------*/ + +bool pce_cart_slot_device::call_load() +{ + if (m_cart) + { + UINT32 offset = 0; + UINT32 len = (software_entry() == NULL) ? length() : get_software_region_length("rom"); + UINT8 *ROM; + + // From fullpath, check for presence of a header and skip it + if (software_entry() == NULL && (len % 0x4000) == 512) + { + logerror("Rom-header found, skipping\n"); + offset = 512; + len -= offset; + fseek(offset, SEEK_SET); + } + + m_cart->rom_alloc(len, tag()); + ROM = m_cart->get_rom_base(); + + if (software_entry() == NULL) + fread(ROM, len); + else + memcpy(ROM, get_software_region("rom"), len); + + // check for encryption (US carts) + if (ROM[0x1fff] < 0xe0) + { + UINT8 decrypted[256]; + + /* Initialize decryption table */ + for (int i = 0; i < 256; i++) + decrypted[i] = ((i & 0x01) << 7) | ((i & 0x02) << 5) | ((i & 0x04) << 3) | ((i & 0x08) << 1) | ((i & 0x10) >> 1) | ((i & 0x20 ) >> 3) | ((i & 0x40) >> 5) | ((i & 0x80) >> 7); + + /* Decrypt ROM image */ + for (int i = 0; i < len; i++) + ROM[i] = decrypted[ROM[i]]; + } + + m_cart->rom_map_setup(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 = pce_get_pcb_id(pcb_name); + } + //printf("Type: %s\n", pce_get_slot(m_type)); + + if (m_type == PCE_POPULOUS) + m_cart->ram_alloc(0x8000); + if (m_type == PCE_CDSYS3J || m_type == PCE_CDSYS3U) + m_cart->ram_alloc(0x30000); + + return IMAGE_INIT_PASS; + } + + return IMAGE_INIT_PASS; +} + + +/*------------------------------------------------- + call_unload + -------------------------------------------------*/ + +void pce_cart_slot_device::call_unload() +{ +} + + +/*------------------------------------------------- + call softlist load + -------------------------------------------------*/ + +bool pce_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 pce_cart_slot_device::get_cart_type(UINT8 *ROM, UINT32 len) +{ + int type = PCE_STD; + + /* Check for Street fighter 2 */ + if (len == 0x280000) + type = PCE_SF2; + + /* Check for Populous */ + if (len >= (0x1f26 + 8) && !memcmp(ROM + 0x1f26, "POPULOUS", 8)) + type = PCE_POPULOUS; + + // Check for CD system card v3 which adds on-cart RAM to the system + if (len >= (0x3ffb6 + 23) && !memcmp(ROM + 0x3ffb6, "PC Engine CD-ROM SYSTEM", 23)) + { + /* Check if 192KB additional system card ram should be used */ + if (!memcmp(ROM + 0x29d1, "VER. 3.", 7)) { type = PCE_CDSYS3J; } // JP version + else if (!memcmp(ROM + 0x29c4, "VER. 3.", 7 )) { type = PCE_CDSYS3U; } // US version + } + + return type; +} + + +/*------------------------------------------------- + get default card software + -------------------------------------------------*/ + +void pce_cart_slot_device::get_default_card_software(std::string &result) +{ + if (open_image_file(mconfig().options())) + { + const char *slot_string = "rom"; + UINT32 len = core_fsize(m_file); + dynamic_buffer rom(len); + int type; + + core_fread(m_file, &rom[0], len); + + type = get_cart_type(&rom[0], len); + slot_string = pce_get_slot(type); + + //printf("type: %s\n", slot_string); + clear(); + + result.assign(slot_string); + return; + } + + software_get_default_slot(result, "rom"); +} + +/*------------------------------------------------- + read + -------------------------------------------------*/ + +READ8_MEMBER(pce_cart_slot_device::read_cart) +{ + if (m_cart) + return m_cart->read_cart(space, offset); + else + return 0xff; +} + +/*------------------------------------------------- + write + -------------------------------------------------*/ + +WRITE8_MEMBER(pce_cart_slot_device::write_cart) +{ + if (m_cart) + m_cart->write_cart(space, offset, data); +} + + +/*------------------------------------------------- + Internal header logging + -------------------------------------------------*/ + +void pce_cart_slot_device::internal_header_logging(UINT8 *ROM, UINT32 len) +{ +} |