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diff --git a/src/devices/sound/ym2203.h b/src/devices/sound/ym2203.h
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+
+#ifndef MAME_SOUND_YM2203_H
+#define MAME_SOUND_YM2203_H
+
+#pragma once
+
+#include "ymfm.h"
+#include "ay8910.h"
+
+
+// ======================> ym2203_device
+
+DECLARE_DEVICE_TYPE(YM2203, ym2203_device);
+
+class ym2203_device : public ay8910_device
+{
+public:
+ // constructor
+ ym2203_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ // configuration helpers
+ auto irq_handler() { return m_opn.irq_handler(); }
+
+ // read/write access
+ u8 read(offs_t offset);
+ void write(offs_t offset, u8 data);
+
+ // direct port access
+ u8 status_port_r() { return read(0); }
+ u8 read_port_r() { return read(1); }
+ void control_port_w(u8 data) { write(0, data); }
+ void write_port_w(u8 data) { write(1, data); }
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual void device_clock_changed() override;
+
+ // sound overrides
+ virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
+
+private:
+ // set a new prescale value and update clocks
+ void update_prescale(u8 newval);
+
+ // internal state
+ ymopn_engine m_opn; // core OPN engine
+ sound_stream *m_stream; // sound stream
+ attotime m_busy_duration; // precomputed busy signal duration
+ u8 m_address; // address register
+};
+
+#endif // MAME_SOUND_YM2203_H