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Diffstat (limited to 'src/devices/bus/msx/slot/msx_write.cpp')
-rw-r--r--src/devices/bus/msx/slot/msx_write.cpp77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/devices/bus/msx/slot/msx_write.cpp b/src/devices/bus/msx/slot/msx_write.cpp
new file mode 100644
index 00000000000..dca08d30f10
--- /dev/null
+++ b/src/devices/bus/msx/slot/msx_write.cpp
@@ -0,0 +1,77 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+/*
+
+ Emulation of the firmware mapper in the Sanyo PHC-77.
+
+*/
+
+#include "emu.h"
+#include "msx_write.h"
+
+
+DEFINE_DEVICE_TYPE(MSX_SLOT_MSX_WRITE, msx_slot_msx_write_device, "msx_slot_msx_write", "MSX Internal MSX-Write")
+
+
+msx_slot_msx_write_device::msx_slot_msx_write_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, MSX_SLOT_MSX_WRITE, tag, owner, clock)
+ , msx_internal_slot_interface(mconfig, *this)
+ , m_rom_region(*this, finder_base::DUMMY_TAG)
+ , m_switch_port(*this, "SWITCH")
+ , m_rombank(*this, "rombank%u", 0U)
+ , m_view{ {*this, "view1"}, {*this, "view2"} }
+ , m_region_offset(0)
+ , m_enabled(true)
+{
+}
+
+static INPUT_PORTS_START(msx_write)
+ PORT_START("SWITCH")
+ PORT_CONFNAME(0x01, 0x01, "Firmware is")
+ PORT_CONFSETTING(0x00, "disabled")
+ PORT_CONFSETTING(0x01, "enabled")
+INPUT_PORTS_END
+
+ioport_constructor msx_slot_msx_write_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(msx_write);
+}
+
+void msx_slot_msx_write_device::device_start()
+{
+ // Sanity checks
+ if (m_rom_region->bytes() != 0x80000)
+ {
+ fatalerror("Memory region '%s' is not the correct size for the MSX-Write firmware\n", m_rom_region.finder_tag());
+ }
+
+ m_rombank[0]->configure_entries(0, 0x20, m_rom_region->base() + m_region_offset, 0x4000);
+ m_rombank[1]->configure_entries(0, 0x20, m_rom_region->base() + m_region_offset, 0x4000);
+
+ page(1)->install_view(0x4000, 0x7fff, m_view[0]);
+ m_view[0][0].install_read_bank(0x4000, 0x7fff, m_rombank[0]);
+ m_view[0][0].install_write_handler(0x6fff, 0x6fff, emu::rw_delegate(*this, FUNC(msx_slot_msx_write_device::bank_w<0>)));
+ m_view[0][0].install_write_handler(0x7fff, 0x7fff, emu::rw_delegate(*this, FUNC(msx_slot_msx_write_device::bank_w<1>)));
+ m_view[0][1];
+
+ page(2)->install_view(0x8000, 0xbfff, m_view[1]);
+ m_view[1][0].install_read_bank(0x8000, 0xbfff, m_rombank[1]);
+ m_view[1][1];
+}
+
+void msx_slot_msx_write_device::device_reset()
+{
+ m_enabled = BIT(m_switch_port->read(), 0);
+
+ for (int i = 0; i < 2; i++)
+ {
+ m_rombank[i]->set_entry(i);
+ m_view[i].select(m_enabled ? 0 : 1);
+ }
+}
+
+template <int Bank>
+void msx_slot_msx_write_device::bank_w(u8 data)
+{
+ m_rombank[Bank]->set_entry(data & 0x1f);
+}