/* Emulation of the firmware mapper as found in Sony HB-F1XDJ and HB-F1XV machines. */ #include "emu.h" #include "sony08.h" const device_type MSX_SLOT_SONY08 = &device_creator; msx_slot_sony08_device::msx_slot_sony08_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, MSX_SLOT_SONY08, "MSX Internal SONY08", tag, owner, clock, "msx_slot_sony08", __FILE__) , msx_internal_slot_interface() , m_nvram(*this, "nvram") , m_region(NULL) , m_region_offset(0) , m_rom(NULL) { for (int i = 0; i < 8; i++) { m_selected_bank[i] = 0; m_bank_base[i] = NULL; } memset(m_sram, 0, sizeof(m_sram)); } static MACHINE_CONFIG_FRAGMENT( sony08 ) MCFG_NVRAM_ADD_0FILL("nvram") MACHINE_CONFIG_END machine_config_constructor msx_slot_sony08_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( sony08 ); } void msx_slot_sony08_device::set_rom_start(device_t &device, const char *region, UINT32 offset) { msx_slot_sony08_device &dev = downcast(device); dev.m_region = region; dev.m_region_offset = offset; } void msx_slot_sony08_device::device_start() { assert(m_region != NULL ); memory_region *m_rom_region = owner()->memregion(m_region); // Sanity checks if (m_rom_region == NULL ) { fatalerror("Rom slot '%s': Unable to find memory region '%s'\n", tag(), m_region); } if (m_rom_region->bytes() < m_region_offset + 0x100000) { fatalerror("Memory region '%s' is too small for the SONY08 firmware\n", m_region); } m_rom = m_rom_region->base() + m_region_offset; m_nvram->set_base(m_sram, 0x4000); save_item(NAME(m_selected_bank)); machine().save().register_postload(save_prepost_delegate(FUNC(msx_slot_sony08_device::restore_banks), this)); restore_banks(); } void msx_slot_sony08_device::map_bank(int bank) { if (bank < 2) { return; } // Special banks if (bank == 6 || bank == 7) { m_bank_base[bank] = m_rom + 0x80000 + (m_selected_bank[bank] * 0x800); return; } m_bank_base[bank] = m_rom + ((m_selected_bank[bank] * 0x2000) & 0xFFFFF); if (bank == 2) { if (m_selected_bank[bank] & 0x80) { m_bank_base[0] = m_sram; m_bank_base[1] = m_sram + 0x2000; } else { m_bank_base[0] = NULL; m_bank_base[1] = NULL; } } } void msx_slot_sony08_device::restore_banks() { for (int i = 0; i < 8; i++) { map_bank(i); } } READ8_MEMBER(msx_slot_sony08_device::read) { if (offset >= 0xc000) { return 0xFF; } if ((offset & 0xf000) == 0x7000 && (m_selected_bank[3] & 0x80)) { return m_bank_base[6 + ((offset >> 11) & 0x01)][offset & 0x7ff]; } const UINT8 *mem = m_bank_base[offset >> 13]; if (mem) { return mem[offset & 0x1fff]; } return 0xFF; } WRITE8_MEMBER(msx_slot_sony08_device::write) { if (offset < 0x4000) { if (m_bank_base[0] != NULL) { m_sram[offset & 0x3fff] = data; return; } } switch (offset) { case 0x4FFF: m_selected_bank[2] = data; map_bank(2); break; case 0x6FFF: // 6000-7FFF m_selected_bank[3] = data; map_bank(3); break; case 0x77FF: m_selected_bank[6] = data; map_bank(6); break; case 0x7FFF: m_selected_bank[7] = data; map_bank(7); break; case 0x8FFF: m_selected_bank[4] = data; map_bank(4); break; case 0xAFFF: m_selected_bank[5] = data; map_bank(5); break; default: logerror("Unhandled write %02x to %04x\n", data, offset); break; } }