// license:BSD-3-Clause // copyright-holders:etabeta /*********************************************************************************************************** Bally Astrocade cart emulation ***********************************************************************************************************/ #include "emu.h" #include "rom.h" //------------------------------------------------- // astrocade_rom_device - constructor //------------------------------------------------- const device_type ASTROCADE_ROM_STD = &device_creator; const device_type ASTROCADE_ROM_256K = &device_creator; const device_type ASTROCADE_ROM_512K = &device_creator; astrocade_rom_device::astrocade_rom_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : device_t(mconfig, type, name, tag, owner, clock, shortname, source), device_astrocade_cart_interface(mconfig, *this) { } astrocade_rom_device::astrocade_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, ASTROCADE_ROM_STD, "Bally Astrocade Standard Carts", tag, owner, clock, "astrocade_rom", __FILE__), device_astrocade_cart_interface(mconfig, *this) { } astrocade_rom_256k_device::astrocade_rom_256k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_256K, "Bally Astrocade 256K Carts", tag, owner, clock, "astrocade_256k", __FILE__) { } astrocade_rom_512k_device::astrocade_rom_512k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : astrocade_rom_device(mconfig, ASTROCADE_ROM_512K, "Bally Astrocade 512K Carts", tag, owner, clock, "astrocade_512k", __FILE__) { } 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 -------------------------------------------------*/ READ8_MEMBER(astrocade_rom_device::read_rom) { if (offset < m_rom_size) return m_rom[offset]; else return 0xff; } READ8_MEMBER(astrocade_rom_256k_device::read_rom) { 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; } READ8_MEMBER(astrocade_rom_512k_device::read_rom) { 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; }