// license:BSD-3-Clause // copyright-holders:Sandro Ronco // thanks-to:rfka01 /*************************************************************************** K200 64K RAM expansion K202 192K RAM expansion K208 448K RAM expansion ***************************************************************************/ #include "emu.h" #include "ram.h" /*************************************************************************** IMPLEMENTATION ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(DMV_K200, dmv_k200_device, "dmv_k200", "K200 64K RAM expansion") DEFINE_DEVICE_TYPE(DMV_K202, dmv_k202_device, "dmv_k202", "K202 192K RAM expansion") DEFINE_DEVICE_TYPE(DMV_K208, dmv_k208_device, "dmv_k208", "K208 448K RAM expansion") //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // dmv_ram_device_base - constructor //------------------------------------------------- dmv_ram_device_base::dmv_ram_device_base(const machine_config &mconfig, device_type type, uint32_t size, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, type, tag, owner, clock) , device_dmvslot_interface(mconfig, *this) , m_ram(nullptr) , m_size(size) { } //------------------------------------------------- // dmv_k200_device - constructor //------------------------------------------------- dmv_k200_device::dmv_k200_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : dmv_ram_device_base(mconfig, DMV_K200, 1, tag, owner, clock) { } //------------------------------------------------- // dmv_k202_device - constructor //------------------------------------------------- dmv_k202_device::dmv_k202_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : dmv_ram_device_base(mconfig, DMV_K202, 3, tag, owner, clock) { } //------------------------------------------------- // dmv_k208_device - constructor //------------------------------------------------- dmv_k208_device::dmv_k208_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : dmv_ram_device_base(mconfig, DMV_K208, 7, tag, owner, clock) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void dmv_ram_device_base::device_start() { m_ram = machine().memory().region_alloc( "expram", m_size * 0x10000, 1, ENDIANNESS_LITTLE )->base(); // register for state saving save_pointer(NAME(m_ram), m_size * 0x10000); } //------------------------------------------------- // read //------------------------------------------------- void dmv_ram_device_base::ram_read(uint8_t cas, offs_t offset, uint8_t &data) { if (cas && cas <= m_size) data = m_ram[((cas - 1) << 16) | (offset & 0xffff)]; } //------------------------------------------------- // write //------------------------------------------------- void dmv_ram_device_base::ram_write(uint8_t cas, offs_t offset, uint8_t data) { if (cas && cas <= m_size) m_ram[((cas - 1) << 16) | (offset & 0xffff)] = data; }