From c1b0bf352bf01586eac6f4fb5afcf8afc839a156 Mon Sep 17 00:00:00 2001
From: wilbertpol <wilbertpol@users.noreply.github.com>
Date: Fri, 10 Mar 2023 18:33:19 +0000
Subject: bus/msx: Added Yamaha UCN-01 cartridge-to-module slot adapter.
 (#10972)

---
 scripts/src/bus.lua                       |  2 +
 src/devices/bus/msx/cart/cartridge.cpp    |  2 +
 src/devices/bus/msx/cart/yamaha_ucn01.cpp | 64 +++++++++++++++++++++++++++++++
 src/devices/bus/msx/cart/yamaha_ucn01.h   | 12 ++++++
 4 files changed, 80 insertions(+)
 create mode 100644 src/devices/bus/msx/cart/yamaha_ucn01.cpp
 create mode 100644 src/devices/bus/msx/cart/yamaha_ucn01.h

diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index b026cf16ba2..7dbc96e79c1 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -1947,6 +1947,8 @@ if (BUSES["MSX_SLOT"]~=null) then
 		MAME_DIR .. "src/devices/bus/msx/cart/super_swangi.h",
 		MAME_DIR .. "src/devices/bus/msx/cart/yamaha.cpp",
 		MAME_DIR .. "src/devices/bus/msx/cart/yamaha.h",
+		MAME_DIR .. "src/devices/bus/msx/cart/yamaha_ucn01.cpp",
+		MAME_DIR .. "src/devices/bus/msx/cart/yamaha_ucn01.h",
 		MAME_DIR .. "src/devices/bus/msx/softcard/softcard.cpp",
 		MAME_DIR .. "src/devices/bus/msx/softcard/softcard.h",
 	}
diff --git a/src/devices/bus/msx/cart/cartridge.cpp b/src/devices/bus/msx/cart/cartridge.cpp
index 1ac5d458371..da745073fa9 100644
--- a/src/devices/bus/msx/cart/cartridge.cpp
+++ b/src/devices/bus/msx/cart/cartridge.cpp
@@ -32,6 +32,7 @@
 #include "superloderunner.h"
 #include "super_swangi.h"
 #include "yamaha.h"
+#include "yamaha_ucn01.h"
 
 #include "bus/msx/slot/cartridge.h"
 
@@ -80,6 +81,7 @@ void msx_cart(device_slot_interface &device, bool is_in_subslot)
 	device.option_add("beepack", MSX_CART_BEEPACK);
 	device.option_add("bm_012", MSX_CART_BM_012);
 	device.option_add("moonsound", MSX_CART_MOONSOUND);
+	device.option_add("ucn01", MSX_CART_UCN01);
 	if (!is_in_subslot)
 	{
 		device.option_add("slotexp", MSX_CART_SLOTEXPANDER);
diff --git a/src/devices/bus/msx/cart/yamaha_ucn01.cpp b/src/devices/bus/msx/cart/yamaha_ucn01.cpp
new file mode 100644
index 00000000000..39aa35a9e46
--- /dev/null
+++ b/src/devices/bus/msx/cart/yamaha_ucn01.cpp
@@ -0,0 +1,64 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+#include "emu.h"
+#include "yamaha_ucn01.h"
+
+/*
+Emulation of Yamaha UCN-01.
+
+Converts a regular MSX cartridge slot into a Yamaha module slot.
+
+The extra pins are not connected so modules that make use of the
+video out or sound out pins would not work. This limitation is
+currently not emulated.
+
+*/
+
+namespace {
+
+class msx_cart_ucn01_device : public device_t, public msx_cart_interface
+{
+public:
+	msx_cart_ucn01_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+		: device_t(mconfig, MSX_CART_UCN01, tag, owner, clock)
+		, msx_cart_interface(mconfig, *this)
+		, m_module(*this, "module")
+	{ }
+
+protected:
+	virtual void device_start() override { }
+	virtual void device_add_mconfig(machine_config &config) override;
+	virtual void device_resolve_objects() override;
+	virtual void device_config_complete() override;
+
+private:
+	required_device<msx_slot_yamaha_expansion_device> m_module;
+};
+
+void msx_cart_ucn01_device::device_add_mconfig(machine_config &mconfig)
+{
+	MSX_SLOT_YAMAHA_EXPANSION(mconfig, m_module, 0);
+	m_module->option_reset();
+	msx_yamaha_60pin(*m_module, false);
+	m_module->set_default_option(nullptr);
+	m_module->set_fixed(false);
+	m_module->irq_handler().set(*this, FUNC(msx_cart_ucn01_device::irq_out));
+}
+
+void msx_cart_ucn01_device::device_config_complete()
+{
+	if (parent_slot())
+	{
+		auto target = m_module.finder_target();
+		parent_slot()->configure_subslot(*target.first.subdevice<msx_slot_yamaha_expansion_device>(target.second));
+	}
+}
+
+void msx_cart_ucn01_device::device_resolve_objects()
+{
+	m_module->install(page(0), page(1), page(2), page(3));
+}
+
+} // anonymous namespace
+
+DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_UCN01, msx_cart_interface, msx_cart_ucn01_device, "msx_cart_ucn01", "Yamaha UCN-01")
diff --git a/src/devices/bus/msx/cart/yamaha_ucn01.h b/src/devices/bus/msx/cart/yamaha_ucn01.h
new file mode 100644
index 00000000000..469f4a7eb8f
--- /dev/null
+++ b/src/devices/bus/msx/cart/yamaha_ucn01.h
@@ -0,0 +1,12 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+#ifndef MAME_BUS_MSX_CART_YAMAHA_UCN01_H
+#define MAME_BUS_MSX_CART_YAMAHA_UCN01_H
+
+#pragma once
+
+#include "bus/msx/slot/cartridge.h"
+
+DECLARE_DEVICE_TYPE(MSX_CART_UCN01, msx_cart_interface)
+
+#endif // MAME_BUS_MSX_CART_YAMAHA_UCN01_H
-- 
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