From f627895caff0fadc9e85991447bff050ed1a18ad Mon Sep 17 00:00:00 2001
From: Olivier Galibert <galibert@pobox.com>
Date: Fri, 8 Dec 2023 08:54:31 +0100
Subject: [PATCH] waveblaster: add the db50xg [O. Galibert, Phil Bennett]

---
 scripts/src/bus.lua                         |  2 +
 src/devices/bus/waveblaster/db50xg.cpp      | 76 +++++++++++++++++++++
 src/devices/bus/waveblaster/db50xg.h        | 35 ++++++++++
 src/devices/bus/waveblaster/waveblaster.cpp |  2 +
 4 files changed, 115 insertions(+)
 create mode 100644 src/devices/bus/waveblaster/db50xg.cpp
 create mode 100644 src/devices/bus/waveblaster/db50xg.h

diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 30eb2131b30..a593430ee7d 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -5376,5 +5376,7 @@ if (BUSES["WAVEBLASTER"]~=null) then
 		MAME_DIR .. "src/devices/bus/waveblaster/waveblaster.h",
 		MAME_DIR .. "src/devices/bus/waveblaster/omniwave.cpp",
 		MAME_DIR .. "src/devices/bus/waveblaster/omniwave.h",
+		MAME_DIR .. "src/devices/bus/waveblaster/db50xg.cpp",
+		MAME_DIR .. "src/devices/bus/waveblaster/db50xg.h",
 	}
 end
diff --git a/src/devices/bus/waveblaster/db50xg.cpp b/src/devices/bus/waveblaster/db50xg.cpp
new file mode 100644
index 00000000000..6f69ac960fd
--- /dev/null
+++ b/src/devices/bus/waveblaster/db50xg.cpp
@@ -0,0 +1,76 @@
+// license:BSD-3-Clause
+// copyright-holders: Olivier Galibert
+
+// Yamaha DB50XG
+
+// PCB name: XQ791
+
+// It's in large part a mu50 on a board, same swp00, same wave roms.
+// CPU and program are different though, and obvsiously there's no
+// LCD.  The are also no analog inputs, which were half-assed in the
+// mu50 anyway.
+
+#include "emu.h"
+#include "db50xg.h"
+
+DEFINE_DEVICE_TYPE(DB50XG, db50xg_device, "db50xg", "Yamaha DB50XG")
+
+db50xg_device::db50xg_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+	device_t(mconfig, DB50XG, tag, owner, clock),
+	device_waveblaster_interface(mconfig, *this),
+	m_cpu(*this, "cpu"),
+	m_swp00(*this, "swp00")
+{
+}
+	
+db50xg_device::~db50xg_device()
+{
+}
+
+void db50xg_device::midi_rx(int state)
+{
+	m_cpu->sci_rx_w<0>(state);
+}
+
+void db50xg_device::map(address_map &map)
+{
+	map(0x000000, 0x07ffff).rom().region("cpu", 0);
+	map(0x400000, 0x4007ff).m(m_swp00, FUNC(swp00_device::map));
+	map(0x600000, 0x607fff).ram();
+}
+
+void db50xg_device::device_add_mconfig(machine_config &config)
+{
+	H83002(config, m_cpu, 12_MHz_XTAL);
+	m_cpu->set_addrmap(AS_PROGRAM, &db50xg_device::map);
+	m_cpu->write_sci_tx<0>().set([this](int state) { m_connector->do_midi_tx(state); } );
+
+	SWP00(config, m_swp00);
+	m_swp00->add_route(0, "^", 1.0, AUTO_ALLOC_INPUT, 0);
+	m_swp00->add_route(1, "^", 1.0, AUTO_ALLOC_INPUT, 1);
+}
+
+ROM_START( db50xg )
+	ROM_REGION( 0x80000, "cpu", 0 )
+	ROM_LOAD16_WORD_SWAP( "xr253a0.ic7", 0x000000, 0x080000, CRC(6c2a2c49) SHA1(61a80e066c7ff40dcba01b796d9faff3b9952a5b) )
+
+	ROM_REGION( 0x400000, "swp00", 0 )
+	ROM_LOAD( "xq730b0.ic9", 0x000000, 0x200000, CRC(d4adbc7e) SHA1(32f653c7644d060f5a6d63a435ae3a7412386d92) )
+	ROM_LOAD( "xq731b0.ic10", 0x200000, 0x200000, CRC(7b68f475) SHA1(adf68689b4842ec5bc9b0ea1bb99cf66d2dec4de) )
+ROM_END
+
+void db50xg_device::device_start()
+{
+}
+
+void db50xg_device::device_reset()
+{
+	// Active-low, wired to gnd
+	m_cpu->set_input_line(0, ASSERT_LINE);
+}
+
+const tiny_rom_entry *db50xg_device::device_rom_region() const
+{
+	return ROM_NAME(db50xg);
+}
+
diff --git a/src/devices/bus/waveblaster/db50xg.h b/src/devices/bus/waveblaster/db50xg.h
new file mode 100644
index 00000000000..db32e8ded7f
--- /dev/null
+++ b/src/devices/bus/waveblaster/db50xg.h
@@ -0,0 +1,35 @@
+#ifndef MAME_BUS_WAVEBLASTER_DB50XG_H
+#define MAME_BUS_WAVEBLASTER_DB50XG_H
+
+// Yamaha DB50XG
+
+#pragma once
+
+#include "waveblaster.h"
+#include "cpu/h8/h83002.h"
+#include "sound/swp00.h"
+
+DECLARE_DEVICE_TYPE(DB50XG, db50xg_device)
+
+class db50xg_device : public device_t, public device_waveblaster_interface
+{
+public:
+	db50xg_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	virtual ~db50xg_device();
+
+	virtual void midi_rx(int state) override;
+
+protected:
+	virtual void device_start() override;
+	virtual void device_reset() override;
+	const tiny_rom_entry *device_rom_region() const override;
+	virtual void device_add_mconfig(machine_config &config) override;
+
+private:
+	required_device<h83002_device> m_cpu;
+	required_device<swp00_device> m_swp00;
+
+	void map(address_map &map);
+};
+
+#endif // MAME_BUS_WAVEBLASTER_DB50XG_H
diff --git a/src/devices/bus/waveblaster/waveblaster.cpp b/src/devices/bus/waveblaster/waveblaster.cpp
index add80223521..402b641a06f 100644
--- a/src/devices/bus/waveblaster/waveblaster.cpp
+++ b/src/devices/bus/waveblaster/waveblaster.cpp
@@ -5,6 +5,7 @@
 #include "waveblaster.h"
 
 #include "omniwave.h"
+#include "db50xg.h"
 
 
 DEFINE_DEVICE_TYPE(WAVEBLASTER_CONNECTOR, waveblaster_connector, "waveblaster_connector", "Waveblaster extension connector")
@@ -32,6 +33,7 @@ void waveblaster_connector::midi_rx(int state)
 void waveblaster_intf(device_slot_interface &device)
 {
 	device.option_add("omniwave", OMNIWAVE);
+	device.option_add("db50xg", DB50XG);
 }
 
 device_waveblaster_interface::device_waveblaster_interface(const machine_config &mconfig, device_t &device) :