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-rw-r--r--src/devices/bus/pce/pce_slot.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/src/devices/bus/pce/pce_slot.c b/src/devices/bus/pce/pce_slot.c
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index 00000000000..bc124852c0c
--- /dev/null
+++ b/src/devices/bus/pce/pce_slot.c
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+// 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)
+{
+}