diff options
Diffstat (limited to 'src/devices/bus/msx_slot/ram_mm.cpp')
-rw-r--r-- | src/devices/bus/msx_slot/ram_mm.cpp | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/src/devices/bus/msx_slot/ram_mm.cpp b/src/devices/bus/msx_slot/ram_mm.cpp deleted file mode 100644 index 84498f9afe1..00000000000 --- a/src/devices/bus/msx_slot/ram_mm.cpp +++ /dev/null @@ -1,82 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Wilbert Pol -#include "emu.h" -#include "ram_mm.h" - -DEFINE_DEVICE_TYPE(MSX_SLOT_RAM_MM, msx_slot_ram_mm_device, "msx_slot_ram_mm", "MSX Internal Memory Mapped RAM") - -msx_slot_ram_mm_device::msx_slot_ram_mm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : device_t(mconfig, MSX_SLOT_RAM_MM, tag, owner, clock) - , msx_internal_slot_interface(mconfig, *this) - , m_total_size(0) - , m_bank_mask(0) - , m_ramio_set_bits(0) -{ -} - -void msx_slot_ram_mm_device::device_start() -{ - // Valid mapper sizes are 64KB, 128KB, 256KB, 512KB, 1MB, 2MB, and 4MB */ - switch (m_total_size) - { - case 64*1024: m_bank_mask = 0x03; break; - case 128*1024: m_bank_mask = 0x07; break; - case 256*1024: m_bank_mask = 0x0F; break; - case 512*1024: m_bank_mask = 0x1F; break; - case 1024*1024: m_bank_mask = 0x3F; break; - case 2048*1024: m_bank_mask = 0x7F; break; - case 4096*1024: m_bank_mask = 0xFF; break; - default: fatalerror("Invalid memory mapper size specified\n"); - } - - m_ram.resize(m_total_size); - - for ( int i = 0; i < 4; i++ ) - { - m_bank_selected[i] = 3 -i; - m_bank_base[i] = &m_ram[0x4000 * m_bank_selected[i]]; - } - - save_item(NAME(m_ram)); - save_item(NAME(m_bank_selected)); - - // Install IO read/write handlers - io_space().install_read_handler(0xFC, 0xFF, read8sm_delegate(*this, FUNC(msx_slot_ram_mm_device::read_mapper_bank))); - io_space().install_write_handler(0xFC, 0xFF, write8sm_delegate(*this, FUNC(msx_slot_ram_mm_device::write_mapper_bank))); -} - -void msx_slot_ram_mm_device::device_post_load() -{ - restore_banks(); -} - -void msx_slot_ram_mm_device::restore_banks() -{ - for ( int i = 0; i < 3; i++ ) - { - m_bank_base[i] = &m_ram[0x4000 * ( m_bank_selected[i] & m_bank_mask )]; - } -} - -uint8_t msx_slot_ram_mm_device::read(offs_t offset) -{ - return m_bank_base[offset >> 14][offset & 0x3fff]; -} - -void msx_slot_ram_mm_device::write(offs_t offset, uint8_t data) -{ - m_bank_base[offset >> 14][offset & 0x3fff] = data; -} - -uint8_t msx_slot_ram_mm_device::read_mapper_bank(offs_t offset) -{ - return m_bank_selected[offset & 3] | m_ramio_set_bits; -} - -void msx_slot_ram_mm_device::write_mapper_bank(offs_t offset, uint8_t data) -{ - offset &= 3; - - m_bank_selected[offset] = data; - m_bank_base[offset] = &m_ram[0x4000 * ( m_bank_selected[offset] & m_bank_mask )]; -} |