// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*********************************************************************************************************** Magnavox Odyssey 2 cart emulation (through slot devices) ***********************************************************************************************************/ #include "emu.h" #include "slot.h" #include //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(O2_CART_SLOT, o2_cart_slot_device, "o2_cart_slot", "Odyssey 2 Cartridge Slot") //************************************************************************** // Odyssey 2 Cartridges Interface //************************************************************************** //------------------------------------------------- // device_o2_cart_interface - constructor //------------------------------------------------- device_o2_cart_interface::device_o2_cart_interface(const machine_config &mconfig, device_t &device) : device_interface(device, "odyssey2cart"), m_rom_size(0), m_exrom_size(0), m_voice_size(0) { } device_o2_cart_interface::~device_o2_cart_interface() { } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // o2_cart_slot_device - constructor //------------------------------------------------- o2_cart_slot_device::o2_cart_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, O2_CART_SLOT, tag, owner, clock), device_cartrom_image_interface(mconfig, *this), device_single_card_slot_interface(mconfig, *this), m_type(O2_STD), m_cart(nullptr), m_conf(*this, "CONF"), m_b(0) { } o2_cart_slot_device::~o2_cart_slot_device() { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void o2_cart_slot_device::device_start() { m_cart = get_card_device(); } //------------------------------------------------- // O2 PCB //------------------------------------------------- struct o2_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 o2_slot slot_list[] = { { O2_STD, "o2_rom" }, { O2_4IN1, "o2_4in1" }, { O2_RALLY, "o2_rally" }, { O2_KTAA, "o2_ktaa" }, { O2_CHESS, "o2_chess" }, { O2_HOMECOMP, "o2_homecomp" }, { O2_TEST, "o2_test" }, { O2_TESTPL, "o2_testpl" }, { O2_VOICE, "o2_voice" } }; static int o2_get_pcb_id(const char *slot) { if (slot) { for (auto & elem : slot_list) { if (!strcmp(elem.slot_option, slot)) return elem.pcb_id; } } return 0; } static const char *o2_get_slot(int type) { for (auto & elem : slot_list) { if (elem.pcb_id == type) return elem.slot_option; } return "o2_rom"; } /*------------------------------------------------- call load -------------------------------------------------*/ std::pair o2_cart_slot_device::call_load() { std::error_condition err; if (m_cart) { if (loaded_through_softlist()) { load_software_region("rom", m_cart->m_rom); load_software_region("exrom", m_cart->m_exrom); load_software_region("voice", m_cart->m_voice); m_cart->m_rom_size = get_software_region_length("rom"); m_cart->m_exrom_size = get_software_region_length("exrom"); m_cart->m_voice_size = get_software_region_length("voice"); m_type = o2_get_pcb_id(get_feature("slot")); // Videopac+ determines whether the screen should have a border, with a gate connected // to the cartridge B pin. This way, old Videopac games can still run in full screen. const char *b_pin = get_feature("b_pin"); m_b = b_pin && strtoul(b_pin, nullptr, 0) ? 1 : 0; } else { u32 const size = length(); size_t actual; std::tie(err, m_cart->m_rom, actual) = read(image_core_file(), size); if (!err && (actual != size)) err = std::errc::io_error; if (!err) { m_cart->m_rom_size = size; m_cart->m_exrom_size = 0; m_cart->m_voice_size = 0; m_b = 0; m_type = (size == 0x4000) ? O2_RALLY : O2_STD; } } if (m_cart->get_rom_size() > 0) m_cart->cart_init(); else if (!err) err = image_error::UNSPECIFIED; } else { err = image_error::UNSPECIFIED; } return std::make_pair(err, std::string()); } /*------------------------------------------------- get default card software -------------------------------------------------*/ std::string o2_cart_slot_device::get_default_card_software(get_default_card_software_hook &hook) const { if (hook.image_file()) { uint64_t size; hook.image_file()->length(size); // FIXME: check error return int const type = (size == 0x4000) ? O2_RALLY : O2_STD; char const *const slot_string = o2_get_slot(type); return std::string(slot_string); } return software_get_default_slot("o2_rom"); } /*------------------------------------------------- read_rom** -------------------------------------------------*/ u8 o2_cart_slot_device::read_rom04(offs_t offset) { if (m_cart) return m_cart->read_rom04(offset); else return 0xff; } u8 o2_cart_slot_device::read_rom0c(offs_t offset) { if (m_cart) return m_cart->read_rom0c(offset); else return 0xff; } /*------------------------------------------------- io -------------------------------------------------*/ void o2_cart_slot_device::io_write(offs_t offset, u8 data) { if (m_cart) m_cart->io_write(offset, data); } u8 o2_cart_slot_device::io_read(offs_t offset) { return (m_cart) ? m_cart->io_read(offset) : 0xff; } void o2_cart_slot_device::bus_write(u8 data) { if (m_cart) m_cart->bus_write(data); } u8 o2_cart_slot_device::bus_read() { return (m_cart) ? m_cart->bus_read() : 0xff; } int o2_cart_slot_device::t0_read() { return (m_cart) ? m_cart->t0_read() : 0; } int o2_cart_slot_device::b_read() { int b_user = m_conf->read() & 3; int b = b_user & 1; if (m_cart) { // cartridge may override pin B setting int b_cart = m_cart->b_read(); if (b_cart >= 0) b = b_cart; else if (b_user & 2) b = m_b; } return b; } /*------------------------------------------------- input ports -------------------------------------------------*/ // Pin B only affects Videopac+ consoles: cartridges can decide whether to mask display edges or not, // by wiring the pin to either VCC or GND. static INPUT_PORTS_START( o2_cart_slot ) PORT_START("CONF") PORT_CONFNAME( 0x03, 0x02, "Cartridge Pin B" ) PORT_CONFSETTING( 0x02, "Auto" ) // get setting from softwarelist PORT_CONFSETTING( 0x00, "0" ) PORT_CONFSETTING( 0x01, "1" ) INPUT_PORTS_END ioport_constructor o2_cart_slot_device::device_input_ports() const { return INPUT_PORTS_NAME(o2_cart_slot); } #include "bus/odyssey2/rom.h" #include "bus/odyssey2/4in1.h" #include "bus/odyssey2/rally.h" #include "bus/odyssey2/ktaa.h" #include "bus/odyssey2/chess.h" #include "bus/odyssey2/homecomp.h" #include "bus/odyssey2/test.h" #include "bus/odyssey2/voice.h" void o2_cart(device_slot_interface &device) { device.option_add_internal("o2_rom", O2_ROM_STD); device.option_add_internal("o2_4in1", O2_ROM_4IN1); device.option_add_internal("o2_rally", O2_ROM_RALLY); device.option_add_internal("o2_ktaa", O2_ROM_KTAA); device.option_add_internal("o2_chess", O2_ROM_CHESS); device.option_add_internal("o2_homecomp", O2_ROM_HOMECOMP); device.option_add_internal("o2_test", O2_ROM_TEST); device.option_add_internal("o2_testpl", O2_ROM_TESTPL); device.option_add_internal("o2_voice", O2_ROM_VOICE); }