// license:BSD-3-Clause // copyright-holders:Wilbert Pol /* Emulation for the internal firmware mapper in the National FS-4600. */ #include "emu.h" #include "fs4600.h" DEFINE_DEVICE_TYPE(MSX_SLOT_FS4600, msx_slot_fs4600_device, "msx_slot_fs4600", "MSX Internal FS4600 Firmware") msx_slot_fs4600_device::msx_slot_fs4600_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, MSX_SLOT_FS4600, tag, owner, clock) , msx_internal_slot_interface(mconfig, *this) , m_nvram(*this, "nvram") , m_rom_region(*this, finder_base::DUMMY_TAG) , m_rombank(*this, "rombank%u", 0U) , m_view{ {*this, "view0"}, {*this, "view1"}, {*this, "view2"} } , m_region_offset(0) , m_sram_address(0) { } void msx_slot_fs4600_device::device_add_mconfig(machine_config &config) { NVRAM(config, m_nvram, nvram_device::DEFAULT_ALL_0); } void msx_slot_fs4600_device::device_start() { // Sanity checks if (m_rom_region->bytes() < m_region_offset + 0x100000) { fatalerror("Memory region '%s' is too small for the FS4600 firmware\n", m_rom_region.finder_tag()); } m_sram = std::make_unique(SRAM_SIZE); m_nvram->set_base(&m_sram[0], SRAM_SIZE); save_item(NAME(m_sram_address)); save_pointer(NAME(m_sram), SRAM_SIZE); for (int i = 0; i < 3; i++) m_rombank[i]->configure_entries(0, 0x40, m_rom_region->base() + m_region_offset, 0x4000); page(0)->install_view(0x0000, 0x3fff, m_view[0]); m_view[0][0].install_read_bank(0x0000, 0x3fff, m_rombank[0]); m_view[0][1].install_read_bank(0x0000, 0x3fff, m_rombank[0]); m_view[0][1].install_write_handler(0x3ffa, 0x3ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_w))); m_view[0][1].install_read_handler(0x3ffd, 0x3ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_r))); page(1)->install_view(0x4000, 0x7fff, m_view[1]); m_view[1][0].install_read_bank(0x4000, 0x7fff, m_rombank[1]); m_view[1][0].install_write_handler(0x6000, 0x6000, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<1>))); m_view[1][0].install_write_handler(0x6400, 0x6400, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<0>))); m_view[1][0].install_write_handler(0x7000, 0x7000, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<2>))); m_view[1][1].install_read_bank(0x4000, 0x7fff, m_rombank[1]); m_view[1][1].install_write_handler(0x7ffa, 0x7ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_w))); m_view[1][1].install_read_handler(0x7ffd, 0x7ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_r))); m_view[1][2].install_read_bank(0x4000, 0x7fff, m_rombank[1]); m_view[1][2].install_write_handler(0x6000, 0x6000, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<1>))); m_view[1][2].install_write_handler(0x6400, 0x6400, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<0>))); m_view[1][2].install_write_handler(0x7000, 0x7000, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_w<2>))); m_view[1][2].install_read_handler(0x7ff0, 0x7ff5, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_r))); m_view[1][3].install_read_bank(0x4000, 0x7fff, m_rombank[1]); m_view[1][3].install_read_handler(0x7ff0, 0x7ff5, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::bank_r))); m_view[1][3].install_write_handler(0x7ffa, 0x7ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_w))); m_view[1][3].install_read_handler(0x7ffd, 0x7ffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_r))); page(1)->install_write_handler(0x7ff9, 0x7ff9, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::control_w))); page(2)->install_view(0x8000, 0xbfff, m_view[2]); m_view[2][0].install_read_bank(0x8000, 0xbfff, m_rombank[2]); m_view[2][1].install_read_bank(0x8000, 0xbfff, m_rombank[2]); m_view[2][1].install_write_handler(0xbffa, 0xbffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_w))); m_view[2][1].install_read_handler(0xbffd, 0xbffd, emu::rw_delegate(*this, FUNC(msx_slot_fs4600_device::sram_r))); } void msx_slot_fs4600_device::device_reset() { for (int i = 0; i < 3; i++) { m_view[i].select(0); m_rombank[i]->set_entry(0); } } u8 msx_slot_fs4600_device::sram_r() { u8 data = m_sram[m_sram_address & (SRAM_SIZE - 1)]; if (!machine().side_effects_disabled()) m_sram_address++; return data; } void msx_slot_fs4600_device::sram_w(offs_t offset, u8 data) { switch (offset) { case 0: m_sram_address = (m_sram_address & 0x00ffff) | (data << 16); break; case 1: m_sram_address = (m_sram_address & 0xff00ff) | (data << 8); break; case 2: m_sram_address = (m_sram_address & 0xffff00) | data; break; case 3: m_sram[m_sram_address++ & (SRAM_SIZE - 1)] = data; break; } } u8 msx_slot_fs4600_device::bank_r(offs_t offset) { return m_rombank[offset >> 1]->entry(); } template void msx_slot_fs4600_device::bank_w(u8 data) { m_rombank[Bank]->set_entry(data & 0x3f); } void msx_slot_fs4600_device::control_w(u8 data) { m_view[0].select((data >> 1) & 0x01); m_view[1].select((data >> 1) & 0x03); m_view[2].select((data >> 1) & 0x01); }