diff options
Diffstat (limited to 'src/devices/bus/msx/slot/rom.cpp')
-rw-r--r-- | src/devices/bus/msx/slot/rom.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/devices/bus/msx/slot/rom.cpp b/src/devices/bus/msx/slot/rom.cpp new file mode 100644 index 00000000000..783e4313f30 --- /dev/null +++ b/src/devices/bus/msx/slot/rom.cpp @@ -0,0 +1,37 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "rom.h" + + +DEFINE_DEVICE_TYPE(MSX_SLOT_ROM, msx_slot_rom_device, "msx_slot_rom", "MSX Internal ROM") + + +msx_slot_rom_device::msx_slot_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : msx_slot_rom_device(mconfig, MSX_SLOT_ROM, tag, owner, clock) +{ +} + +msx_slot_rom_device::msx_slot_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, type, tag, owner, clock) + , msx_internal_slot_interface(mconfig, *this) + , m_rom_region(*this, finder_base::DUMMY_TAG) + , m_region_offset(0) +{ +} + +void msx_slot_rom_device::device_start() +{ + // Sanity checks + if (m_rom_region->bytes() < m_region_offset + m_size) + { + fatalerror("Memory region '%s' is too small for rom slot '%s'\n", m_rom_region.finder_tag(), tag()); + } + + u8 *rom = m_rom_region->base() + m_region_offset; + for (int i = m_start_address >> 14; i < 4 && i * 0x4000 < m_end_address; i++) + { + page(i)->install_rom(i * 0x4000, std::min<u32>((i + 1) * 0x4000, m_end_address) - 1, rom); + rom += 0x4000; + } +} |