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Diffstat (limited to 'src/devices/bus/msx_slot/sony08.cpp')
-rw-r--r--src/devices/bus/msx_slot/sony08.cpp190
1 files changed, 190 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..66a5f733e2d
--- /dev/null
+++ b/src/devices/bus/msx_slot/sony08.cpp
@@ -0,0 +1,190 @@
+// 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"
+
+
+const device_type MSX_SLOT_SONY08 = &device_creator<msx_slot_sony08_device>;
+
+
+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<msx_slot_sony08_device &>(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;
+ }
+}