diff options
Diffstat (limited to 'src/devices/bus/msx/slot/sony08.cpp')
-rw-r--r-- | src/devices/bus/msx/slot/sony08.cpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/devices/bus/msx/slot/sony08.cpp b/src/devices/bus/msx/slot/sony08.cpp new file mode 100644 index 00000000000..e08efccf9cb --- /dev/null +++ b/src/devices/bus/msx/slot/sony08.cpp @@ -0,0 +1,90 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +/* + + Emulation of the firmware mapper as found in Sony HB-F1XDJ and HB-F1XV machines. + +*/ + +#include "emu.h" +#include "sony08.h" + + +DEFINE_DEVICE_TYPE(MSX_SLOT_SONY08, msx_slot_sony08_device, "msx_slot_sony08", "MSX Internal SONY08") + + +msx_slot_sony08_device::msx_slot_sony08_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_SLOT_SONY08, 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_view0(*this, "view0") + , m_view1(*this, "view1") + , m_region_offset(0) +{ +} + + +void msx_slot_sony08_device::device_add_mconfig(machine_config &config) +{ + NVRAM(config, m_nvram, nvram_device::DEFAULT_ALL_0); +} + +void msx_slot_sony08_device::device_start() +{ + // Sanity checks + if (m_rom_region->bytes() < m_region_offset + 0x100000) + { + fatalerror("Memory region '%s' is too small for the SONY08 firmware\n", m_rom_region.finder_tag()); + } + + m_sram.resize(SRAM_SIZE); + m_nvram->set_base(m_sram.data(), SRAM_SIZE); + + for (int i = 0; i < 4; i++) + m_rombank[i]->configure_entries(0, 0x80, m_rom_region->base() + m_region_offset, 0x2000); + m_rombank[4]->configure_entries(0, 0x100, m_rom_region->base() + m_region_offset + 0x80000, 0x800); + m_rombank[5]->configure_entries(0, 0x100, m_rom_region->base() + m_region_offset + 0x80000, 0x800); + + page(0)->install_view(0x0000, 0x3fff, m_view0); + m_view0[0]; + m_view0[1].install_ram(0x0000, 0x3fff, m_sram.data()); + + page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]); + page(1)->install_write_handler(0x4fff, 0x4fff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<0>))); + page(1)->install_view(0x6000, 0x7fff, m_view1); + m_view1[0].install_read_bank(0x6000, 0x7fff, m_rombank[1]); + m_view1[1].install_read_bank(0x6000, 0x6fff, m_rombank[1]); + m_view1[1].install_read_bank(0x7000, 0x77ff, m_rombank[4]); + m_view1[1].install_read_bank(0x7800, 0x7fff, m_rombank[5]); + page(1)->install_write_handler(0x6fff, 0x6fff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<1>))); + page(1)->install_write_handler(0x77ff, 0x77ff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<4>))); + page(1)->install_write_handler(0x7fff, 0x7fff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<5>))); + page(2)->install_read_bank(0x8000, 0x9fff, m_rombank[2]); + page(2)->install_write_handler(0x8fff, 0x8fff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<2>))); + page(2)->install_read_bank(0xa000, 0xbfff, m_rombank[3]); + page(2)->install_write_handler(0xafff, 0xafff, emu::rw_delegate(*this, FUNC(msx_slot_sony08_device::bank_w<3>))); +} + +void msx_slot_sony08_device::device_reset() +{ + m_view0.select(0); + m_view1.select(0); + for (int i = 0; i < 6; i++) + m_rombank[i]->set_entry(0); +} + +template <int Bank> +void msx_slot_sony08_device::bank_w(u8 data) +{ + if (Bank >= 4) + m_rombank[Bank]->set_entry(data); + else + m_rombank[Bank]->set_entry(data & 0x7f); + + if (Bank == 0) + m_view0.select(BIT(data, 7) ? 1 : 0); + if (Bank == 1) + m_view1.select(BIT(data, 7) ? 1 : 0); +} |