// license:BSD-3-Clause // copyright-holders:Fabio Priuli /*********************************************************************************************************** Bally Astrocade cart emulation ***********************************************************************************************************/ #include "emu.h" #include "rom.h" //------------------------------------------------- // astrocade_rom_device - constructor //------------------------------------------------- DEFINE_DEVICE_TYPE(ASTROCADE_ROM_STD, astrocade_rom_device, "astrocade_rom", "Bally Astrocade Standard Carts") DEFINE_DEVICE_TYPE(ASTROCADE_ROM_256K, astrocade_rom_256k_device, "astrocade_rom_256k", "Bally Astrocade 256K Carts") DEFINE_DEVICE_TYPE(ASTROCADE_ROM_512K, astrocade_rom_512k_device, "astrocade_rom_512k", "Bally Astrocade 512K Carts") DEFINE_DEVICE_TYPE(ASTROCADE_ROM_CASS, astrocade_rom_cass_device, "astrocade_rom_cass", "Bally Astrocade AstroBASIC Cart") astrocade_rom_device::astrocade_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, type, tag, owner, clock), device_astrocade_cart_interface(mconfig, *this) { } astrocade_rom_device::astrocade_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_STD, tag, owner, clock) { } astrocade_rom_256k_device::astrocade_rom_256k_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_256K, tag, owner, clock), m_base_bank(0) { } astrocade_rom_512k_device::astrocade_rom_512k_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_512K, tag, owner, clock), m_base_bank(0) { } astrocade_rom_cass_device::astrocade_rom_cass_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_CASS, tag, owner, clock) , m_cassette(*this, "cassette") { } void astrocade_rom_256k_device::device_start() { save_item(NAME(m_base_bank)); } void astrocade_rom_256k_device::device_reset() { m_base_bank = 0; } void astrocade_rom_512k_device::device_start() { save_item(NAME(m_base_bank)); } void astrocade_rom_512k_device::device_reset() { m_base_bank = 0; } /*------------------------------------------------- mapper specific handlers -------------------------------------------------*/ uint8_t astrocade_rom_device::read_rom(offs_t offset) { if (offset < m_rom_size) return m_rom[offset]; else return 0xff; } uint8_t astrocade_rom_256k_device::read_rom(offs_t offset) { if (offset < 0x1000) // 0x2000-0x2fff return m_rom[offset + 0x1000 * 0x3f]; else if (offset < 0x1fc0) // 0x3000-0x3fbf return m_rom[(offset & 0xfff) + (0x1000 * m_base_bank)]; else // 0x3fc0-0x3fff return m_base_bank = offset & 0x3f; } uint8_t astrocade_rom_512k_device::read_rom(offs_t offset) { if (offset < 0x1000) // 0x2000-0x2fff return m_rom[offset + 0x1000 * 0x7f]; else if (offset < 0x1f80) // 0x3000-0x3fbf return m_rom[(offset & 0xfff) + (0x1000 * m_base_bank)]; else // 0x3fc0-0x3fff return m_base_bank = offset & 0x7f; } uint8_t astrocade_rom_cass_device::read_rom(offs_t offset) { if (offset < m_rom_size) return m_rom[offset]; else if ((offset & 0x1c00) == 0x1800) { m_cassette->output(+1); return 0xff; } else if ((offset & 0x1c00) == 0x1c00) { m_cassette->output(-1); return m_cassette->input() > 0.0 ? 0 : 1; } return 0xff; } /*------------------------------------------------- mapper specific device configuration -------------------------------------------------*/ void astrocade_rom_cass_device::device_add_mconfig(machine_config &config) { CASSETTE(config, m_cassette); m_cassette->set_default_state(CASSETTE_STOPPED); m_cassette->set_interface("astrocade_cass"); }