// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Bondwell 2 RAMCARD emulation **********************************************************************/ #include "emu.h" #include "ramcard.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(BW2_RAMCARD, bw2_ramcard_device, "bw2_ramcard", "Bondwell 2 RAMCARD") //------------------------------------------------- // ROM( bw2_ramcard ) //------------------------------------------------- ROM_START( bw2_ramcard ) ROM_REGION( 0x4000, "rom", 0 ) ROM_LOAD( "ramcard-10.ic10", 0x0000, 0x4000, CRC(68cde1ba) SHA1(a776a27d64f7b857565594beb63aa2cd692dcf04) ) ROM_END //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *bw2_ramcard_device::device_rom_region() const { return ROM_NAME( bw2_ramcard ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // bw2_ramcard_device - constructor //------------------------------------------------- bw2_ramcard_device::bw2_ramcard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, BW2_RAMCARD, tag, owner, clock), device_bw2_expansion_slot_interface(mconfig, *this), m_rom(*this, "rom"), m_ram(*this, "ram", 512*1024, ENDIANNESS_LITTLE) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void bw2_ramcard_device::device_start() { // state saving save_item(NAME(m_en)); save_item(NAME(m_bank)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void bw2_ramcard_device::device_reset() { m_en = 0; m_bank = 0; ram_select(); } void bw2_ramcard_device::slot_w(offs_t offset, uint8_t data) { m_en = 1; m_bank = data & 0xf; ram_select(); } void bw2_ramcard_device::ram_select() { if (m_slot->ram2()) { m_rom_tap = m_slot->memspace()->install_read_tap(0x0000, 0x3fff, 0x4000, "rom", [this] (offs_t offset, u8 &data, u8) { data &= m_rom->base()[offset]; }, &m_rom_tap); } else { m_rom_tap.remove(); } if (m_en && m_slot->ram5()) { m_ram_tap = m_slot->memspace()->install_readwrite_tap(0x0000, 0x7fff, "ram", [this] (offs_t offset, u8 &data, u8) { data &= m_ram[m_bank << 15 | offset]; }, [this] (offs_t offset, u8 &data, u8) { m_ram[m_bank << 15 | offset] = data; }, &m_ram_tap); } else { m_ram_tap.remove(); } }