// license:BSD-3-Clause // copyright-holders:Sandro Ronco /*************************************************************************** K200 64K RAM expansion K202 192K RAM expansion K208 448K RAM expansion ***************************************************************************/ #include "emu.h" #include "ram.h" /*************************************************************************** IMPLEMENTATION ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type DMV_K200 = &device_creator; const device_type DMV_K202 = &device_creator; const device_type DMV_K208 = &device_creator; //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // dmv_ram_device - constructor //------------------------------------------------- dmv_ram_device::dmv_ram_device(const machine_config &mconfig, device_type type, UINT32 size, 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_dmvslot_interface( mconfig, *this ), m_size(size) { } //------------------------------------------------- // dmv_k200_device - constructor //------------------------------------------------- dmv_k200_device::dmv_k200_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : dmv_ram_device(mconfig, DMV_K200, 1, "K200 64K RAM expansion", tag, owner, clock, "dmv_k200", __FILE__) { } //------------------------------------------------- // dmv_k202_device - constructor //------------------------------------------------- dmv_k202_device::dmv_k202_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : dmv_ram_device(mconfig, DMV_K202, 3, "K202 192K RAM expansion", tag, owner, clock, "dmv_k202", __FILE__) { } //------------------------------------------------- // dmv_k208_device - constructor //------------------------------------------------- dmv_k208_device::dmv_k208_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : dmv_ram_device(mconfig, DMV_K208, 7 , "K208 448K RAM expansion", tag, owner, clock, "dmv_k208", __FILE__) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void dmv_ram_device::device_start() { m_ram = machine().memory().region_alloc( "expram", m_size * 0x10000, 1, ENDIANNESS_LITTLE )->base(); } //------------------------------------------------- // read //------------------------------------------------- void dmv_ram_device::ram_read(UINT8 cas, offs_t offset, UINT8 &data) { if (cas && cas <= m_size) data = m_ram[((cas - 1) << 16) | (offset & 0xffff)]; } //------------------------------------------------- // write //------------------------------------------------- void dmv_ram_device::ram_write(UINT8 cas, offs_t offset, UINT8 data) { if (cas && cas <= m_size) m_ram[((cas - 1) << 16) | (offset & 0xffff)] = data; }