// license:BSD-3-Clause // copyright-holders:Sandro Ronco /*************************************************************************** z88.c Z88 RAM cartridges emulation ***************************************************************************/ #include "emu.h" #include "ram.h" namespace { //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> z88_32k_ram_device class z88_32k_ram_device : public device_t, public device_nvram_interface, public device_z88cart_interface { public: // construction/destruction z88_32k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: z88_32k_ram_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); // device_t implementations virtual void device_start() override ATTR_COLD; // device_nvram_interface implementation virtual void nvram_default() override { } virtual bool nvram_read(util::read_stream &file) override { auto const [err, actual] = util::read(file, get_cart_base(), get_cart_size()); return !err && (actual == get_cart_size()); } virtual bool nvram_write(util::write_stream &file) override { auto const [err, actual] = util::write(file, get_cart_base(), get_cart_size()); return !err; } // z88cart_interface implementation virtual uint8_t read(offs_t offset) override; virtual void write(offs_t offset, uint8_t data) override; virtual uint8_t* get_cart_base() override; virtual uint32_t get_cart_size() override { return 0x8000; } protected: // internal state uint8_t * m_ram; }; // ======================> z88_128k_ram_device class z88_128k_ram_device : public z88_32k_ram_device { public: // construction/destruction z88_128k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // z88cart_interface implementation virtual uint32_t get_cart_size() override { return 0x20000; } }; // ======================> z88_512k_ram_device class z88_512k_ram_device : public z88_32k_ram_device { public: // construction/destruction z88_512k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // z88cart_interface implementation virtual uint32_t get_cart_size() override { return 0x80000; } }; // ======================> z88_1024k_ram_device class z88_1024k_ram_device : public z88_32k_ram_device { public: // construction/destruction z88_1024k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); protected: // z88cart_interface overrides virtual uint32_t get_cart_size() override { return 0x100000; } }; /*************************************************************************** IMPLEMENTATION ***************************************************************************/ //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // z88_32k_ram_device - constructor //------------------------------------------------- z88_32k_ram_device::z88_32k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : z88_32k_ram_device(mconfig, Z88_32K_RAM, tag, owner, clock) { } z88_32k_ram_device::z88_32k_ram_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_nvram_interface(mconfig, *this) , device_z88cart_interface(mconfig, *this) , m_ram(nullptr) { } //------------------------------------------------- // z88_128k_ram_device - constructor //------------------------------------------------- z88_128k_ram_device::z88_128k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : z88_32k_ram_device(mconfig, Z88_128K_RAM, tag, owner, clock) { } //------------------------------------------------- // z88_512k_ram_device - constructor //------------------------------------------------- z88_512k_ram_device::z88_512k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : z88_32k_ram_device(mconfig, Z88_512K_RAM, tag, owner, clock) { } //------------------------------------------------- // z88_1024k_ram_device - constructor //------------------------------------------------- z88_1024k_ram_device::z88_1024k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : z88_32k_ram_device(mconfig, Z88_1024K_RAM, tag, owner, clock) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void z88_32k_ram_device::device_start() { m_ram = machine().memory().region_alloc(tag(), get_cart_size(), 1, ENDIANNESS_LITTLE)->base(); memset(m_ram, 0, get_cart_size()); } /*------------------------------------------------- get_cart_base -------------------------------------------------*/ uint8_t* z88_32k_ram_device::get_cart_base() { return m_ram; } /*------------------------------------------------- read -------------------------------------------------*/ uint8_t z88_32k_ram_device::read(offs_t offset) { return m_ram[offset & (get_cart_size() - 1)]; } /*------------------------------------------------- write -------------------------------------------------*/ void z88_32k_ram_device::write(offs_t offset, uint8_t data) { m_ram[offset & (get_cart_size() - 1)] = data; } } // anonymous namespace //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE_PRIVATE(Z88_32K_RAM, device_z88cart_interface, z88_32k_ram_device, "z88_32k_ram", "Z88 32KB RAM") DEFINE_DEVICE_TYPE_PRIVATE(Z88_128K_RAM, device_z88cart_interface, z88_128k_ram_device, "z88_128k_ram", "Z88 128KB RAM") DEFINE_DEVICE_TYPE_PRIVATE(Z88_512K_RAM, device_z88cart_interface, z88_512k_ram_device, "z88_512k_ram", "Z88 512KB RAM") DEFINE_DEVICE_TYPE_PRIVATE(Z88_1024K_RAM, device_z88cart_interface, z88_1024k_ram_device, "z88_1024k_ram", "Z88 1024KB RAM")