// license:BSD-3-Clause // copyright-holders:Wilbert Pol /* Emulation of the firmware mapper in the Sanyo PHC-77. */ #include "emu.h" #include "msx_write.h" DEFINE_DEVICE_TYPE(MSX_SLOT_MSX_WRITE, msx_slot_msx_write_device, "msx_slot_msx_write", "MSX Internal MSX-Write") msx_slot_msx_write_device::msx_slot_msx_write_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, MSX_SLOT_MSX_WRITE, tag, owner, clock) , msx_internal_slot_interface(mconfig, *this) , m_rom_region(*this, finder_base::DUMMY_TAG) , m_switch_port(*this, "SWITCH") , m_rombank(*this, "rombank%u", 0U) , m_view{ {*this, "view1"}, {*this, "view2"} } , m_region_offset(0) , m_enabled(true) { } static INPUT_PORTS_START(msx_write) PORT_START("SWITCH") PORT_CONFNAME(0x01, 0x01, "Firmware is") PORT_CONFSETTING(0x00, "disabled") PORT_CONFSETTING(0x01, "enabled") INPUT_PORTS_END ioport_constructor msx_slot_msx_write_device::device_input_ports() const { return INPUT_PORTS_NAME(msx_write); } void msx_slot_msx_write_device::device_start() { // Sanity checks if (m_rom_region->bytes() != 0x80000) { fatalerror("Memory region '%s' is not the correct size for the MSX-Write firmware\n", m_rom_region.finder_tag()); } m_rombank[0]->configure_entries(0, 0x20, m_rom_region->base() + m_region_offset, 0x4000); m_rombank[1]->configure_entries(0, 0x20, m_rom_region->base() + m_region_offset, 0x4000); page(1)->install_view(0x4000, 0x7fff, m_view[0]); m_view[0][0].install_read_bank(0x4000, 0x7fff, m_rombank[0]); m_view[0][0].install_write_handler(0x6fff, 0x6fff, emu::rw_delegate(*this, FUNC(msx_slot_msx_write_device::bank_w<0>))); m_view[0][0].install_write_handler(0x7fff, 0x7fff, emu::rw_delegate(*this, FUNC(msx_slot_msx_write_device::bank_w<1>))); m_view[0][1]; page(2)->install_view(0x8000, 0xbfff, m_view[1]); m_view[1][0].install_read_bank(0x8000, 0xbfff, m_rombank[1]); m_view[1][1]; } void msx_slot_msx_write_device::device_reset() { m_enabled = BIT(m_switch_port->read(), 0); for (int i = 0; i < 2; i++) { m_rombank[i]->set_entry(i); m_view[i].select(m_enabled ? 0 : 1); } } template void msx_slot_msx_write_device::bank_w(u8 data) { m_rombank[Bank]->set_entry(data & 0x1f); }