diff options
Diffstat (limited to 'src/devices/bus/msx/slot/msx_write.cpp')
-rw-r--r-- | src/devices/bus/msx/slot/msx_write.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/devices/bus/msx/slot/msx_write.cpp b/src/devices/bus/msx/slot/msx_write.cpp new file mode 100644 index 00000000000..dca08d30f10 --- /dev/null +++ b/src/devices/bus/msx/slot/msx_write.cpp @@ -0,0 +1,77 @@ +// 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 <int Bank> +void msx_slot_msx_write_device::bank_w(u8 data) +{ + m_rombank[Bank]->set_entry(data & 0x1f); +} |