// license: BSD-3-Clause // copyright-holders: Dirk Best /*************************************************************************** mc-68000-Computer RAM Expansion Card ***************************************************************************/ #include "emu.h" #include "ram.h" DEFINE_DEVICE_TYPE(MC68000_RAM, mc68000_ram_device, "mc68000_ram", "mc-68000 2 MB RAM Expansion") mc68000_ram_device::mc68000_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MC68000_RAM, tag, owner, clock), device_mc68000_sysbus_card_interface(mconfig, *this) { } void mc68000_ram_device::device_start() { // allocate ram m_ram = std::make_unique(0x200000 / 2); // register for save states save_pointer(NAME(m_ram), 0x200000 / 2); } void mc68000_ram_device::device_reset() { } uint16_t mc68000_ram_device::slot_r(offs_t offset, uint16_t mem_mask) { return m_ram[offset & (0x1fffff >> 1)] & mem_mask; } void mc68000_ram_device::slot_w(offs_t offset, uint16_t data, uint16_t mem_mask) { COMBINE_DATA(&m_ram[offset & (0x1fffff >> 1)]); }