diff options
Diffstat (limited to 'src/devices/bus/msx_slot/fs4600.cpp')
-rw-r--r-- | src/devices/bus/msx_slot/fs4600.cpp | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/src/devices/bus/msx_slot/fs4600.cpp b/src/devices/bus/msx_slot/fs4600.cpp deleted file mode 100644 index 0f328985f6f..00000000000 --- a/src/devices/bus/msx_slot/fs4600.cpp +++ /dev/null @@ -1,142 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Wilbert Pol -/* - Emulation for the internal firmware mapper in the National FS-4600. -*/ - -#include "emu.h" -#include "fs4600.h" - - -DEFINE_DEVICE_TYPE(MSX_SLOT_FS4600, msx_slot_fs4600_device, "msx_slot_fs4600", "MSX Internal FS4600 Firmware") - - -msx_slot_fs4600_device::msx_slot_fs4600_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : device_t(mconfig, MSX_SLOT_FS4600, tag, owner, clock) - , msx_internal_slot_interface(mconfig, *this) - , m_nvram(*this, "nvram") - , m_rom_region(*this, finder_base::DUMMY_TAG) - , m_region_offset(0) - , m_rom(nullptr) - , m_selected_bank{ 0, 0, 0, 0 } - , m_bank_base{ nullptr, nullptr, nullptr, nullptr } - , m_sram_address(0) - , m_control(0) -{ - memset(m_sram, 0, sizeof(m_sram)); -} - - -void msx_slot_fs4600_device::device_add_mconfig(machine_config &config) -{ - NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0); -} - - -void msx_slot_fs4600_device::device_start() -{ - // Sanity checks - if (m_rom_region->bytes() < m_region_offset + 0x100000) - { - fatalerror("Memory region '%s' is too small for the FS4600 firmware\n", m_rom_region.finder_tag()); - } - - m_rom = m_rom_region->base() + m_region_offset; - m_nvram->set_base(m_sram, 0x1000); - - save_item(NAME(m_selected_bank)); - save_item(NAME(m_sram_address)); - save_item(NAME(m_control)); - - restore_banks(); -} - - -void msx_slot_fs4600_device::device_post_load() -{ - restore_banks(); -} - - -void msx_slot_fs4600_device::restore_banks() -{ - for (int i = 0; i < 4; i++) - { - m_bank_base[i] = m_rom + ( ( m_selected_bank[i] * 0x4000 ) & 0x0fffff ); - } -} - - -uint8_t msx_slot_fs4600_device::read(offs_t offset) -{ - if ((m_control & 0x02) && ((offset & 0x3fff) == 0x3ffd)) - { - return m_sram[m_sram_address++ & 0xfff]; - } - if ((m_control & 0x04) && (offset& 0x7ff8) == 0x7ff0) - { - return m_selected_bank[(offset >> 1) & 0x03]; - } - return m_bank_base[offset >> 14][offset & 0x3fff]; -} - - -void msx_slot_fs4600_device::write(offs_t offset, uint8_t data) -{ - if (offset == 0x7ff9) - { - m_control = data; - } - else - { - if (m_control & 0x02) - { - switch (offset & 0x3fff) - { - case 0x3ffa: - m_sram_address = (m_sram_address & 0x00ffff) | (data << 16); - break; - - case 0x3ffb: - m_sram_address = (m_sram_address & 0xff00ff) | (data << 8); - break; - - case 0x3ffc: - m_sram_address = (m_sram_address & 0xffff00) | data; - break; - - case 0x3ffd: - m_sram[m_sram_address++ & 0xfff] = data; - break; - - default: - logerror("msx_slot_fs4600: Unhandled write %02x to %04x\n", data, offset); - break; - } - } - else - { - switch (offset) - { - case 0x6000: - m_selected_bank[1] = data; - m_bank_base[1] = m_rom + ( ( m_selected_bank[1] * 0x4000 ) & 0x0fffff ); - break; - - case 0x6400: - m_selected_bank[0] = data; - m_bank_base[0] = m_rom + ( ( m_selected_bank[0] * 0x4000 ) & 0x0fffff ); - break; - - case 0x7000: - m_selected_bank[2] = data; - m_bank_base[2] = m_rom + ( ( m_selected_bank[2] * 0x4000 ) & 0x0fffff ); - break; - - default: - logerror("msx_slot_fs4600: Unhandled write %02x to %04x\n", data, offset); - break; - } - } - } -} |