// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*********************************************************************************************************** Epoch Super Cassette Vision cart emulation (through slot devices) ***********************************************************************************************************/ #include "emu.h" #include "slot.h" //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(SCV_CART_SLOT, scv_cart_slot_device, "scv_cart_slot", "SCV Cartridge Slot") //************************************************************************** // SCV cartridges Interface //************************************************************************** //------------------------------------------------- // device_scv_cart_interface - constructor //------------------------------------------------- device_scv_cart_interface::device_scv_cart_interface(const machine_config &mconfig, device_t &device) : device_interface(device, "scvcart"), m_rom(nullptr), 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_t size, const char *tag) { if (m_rom == nullptr) { m_rom = device().machine().memory().region_alloc(std::string(tag).append(SCVSLOT_ROM_REGION_TAG).c_str(), 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_t 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_t clock) : device_t(mconfig, SCV_CART_SLOT, tag, owner, clock), device_cartrom_image_interface(mconfig, *this), device_single_card_slot_interface(mconfig, *this), m_type(SCV_8K), m_cart(nullptr) { } //------------------------------------------------- // 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 = get_card_device(); } //------------------------------------------------- // 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 (auto & elem : slot_list) { if (!strcmp(elem.slot_option, slot)) return elem.pcb_id; } return 0; } static const char *scv_get_slot(int type) { for (auto & elem : slot_list) { if (elem.pcb_id == type) return elem.slot_option; } return "rom8k"; } /*------------------------------------------------- call load -------------------------------------------------*/ image_init_result scv_cart_slot_device::call_load() { if (m_cart) { uint8_t *ROM; uint32_t len = !loaded_through_softlist() ? length() : get_software_region_length("rom"); bool has_ram = loaded_through_softlist() && get_software_region("ram"); if (len > 0x20000) { seterror(image_error::INVALIDIMAGE, "Unsupported cartridge size"); return image_init_result::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 (!loaded_through_softlist()) fread(ROM, len); else memcpy(ROM, get_software_region("rom"), len); if (!loaded_through_softlist()) 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_result::PASS; } return image_init_result::PASS; } /*------------------------------------------------- get_cart_type - code to detect NVRAM type from fullpath -------------------------------------------------*/ int scv_cart_slot_device::get_cart_type(const uint8_t *ROM, uint32_t 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 -------------------------------------------------*/ std::string scv_cart_slot_device::get_default_card_software(get_default_card_software_hook &hook) const { if (hook.image_file()) { uint64_t len; hook.image_file()->length(len); // FIXME: check error return, guard against excessively large files std::vector rom(len); size_t actual; hook.image_file()->read(&rom[0], len, actual); // FIXME: check error return or read returning short int const type = get_cart_type(&rom[0], len); char const *const slot_string = scv_get_slot(type); //printf("type: %s\n", slot_string); return std::string(slot_string); } return software_get_default_slot("rom8k"); } /*------------------------------------------------- read -------------------------------------------------*/ uint8_t scv_cart_slot_device::read_cart(offs_t offset) { if (m_cart) return m_cart->read_cart(offset); else return 0xff; } /*------------------------------------------------- write -------------------------------------------------*/ void scv_cart_slot_device::write_cart(offs_t offset, uint8_t data) { if (m_cart) m_cart->write_cart(offset, data); } /*------------------------------------------------- write_bank -------------------------------------------------*/ void scv_cart_slot_device::write_bank(uint8_t data) { if (m_cart) m_cart->write_bank(data); }