// license:BSD-3-Clause // copyright-holders:Sandro Ronco /*************************************************************************** rom.c Z88 ROM cartridges emulation ***************************************************************************/ #include "emu.h" #include "rom.h" /*************************************************************************** IMPLEMENTATION ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(Z88_32K_ROM, z88_32k_rom_device, "z88_32k_rom", "Z88 32KB ROM") DEFINE_DEVICE_TYPE(Z88_128K_ROM, z88_128k_rom_device, "z88_128k_rom", "Z88 128KB ROM") DEFINE_DEVICE_TYPE(Z88_256K_ROM, z88_256k_rom_device, "z88_256k_rom", "Z88 256KB ROM") //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // z88_32k_rom_device - constructor //------------------------------------------------- z88_32k_rom_device::z88_32k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : z88_32k_rom_device(mconfig, Z88_32K_ROM, tag, owner, clock) { } z88_32k_rom_device::z88_32k_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, type, tag, owner, clock) , device_nvram_interface(mconfig, *this) , device_z88cart_interface(mconfig, *this) , m_rom(nullptr) , m_vpp_state(0) , m_modified(false) { } //------------------------------------------------- // z88_128k_rom_device - constructor //------------------------------------------------- z88_128k_rom_device::z88_128k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : z88_32k_rom_device(mconfig, Z88_128K_ROM, tag, owner, clock) { } //------------------------------------------------- // z88_256k_rom_device - constructor //------------------------------------------------- z88_256k_rom_device::z88_256k_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : z88_32k_rom_device(mconfig, Z88_256K_ROM, tag, owner, clock) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void z88_32k_rom_device::device_start() { m_rom = machine().memory().region_alloc(tag(), get_cart_size(), 1, ENDIANNESS_LITTLE)->base(); std::fill_n(m_rom, get_cart_size(), 0xff); save_item(NAME(m_vpp_state)); save_item(NAME(m_modified)); } /*------------------------------------------------- get_cart_base -------------------------------------------------*/ uint8_t* z88_32k_rom_device::get_cart_base() { return m_rom; } /*------------------------------------------------- read -------------------------------------------------*/ uint8_t z88_32k_rom_device::read(offs_t offset) { return m_rom[offset & (get_cart_size() - 1)]; } /*------------------------------------------------- write -------------------------------------------------*/ void z88_32k_rom_device::write(offs_t offset, uint8_t data) { if (m_vpp_state) { const uint32_t offset_mask = get_cart_size() - 1; if (m_rom[offset & offset_mask] & ~data) m_modified = true; m_rom[offset & offset_mask] &= data; } }