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diff --git a/src/devices/sound/ym2610.h b/src/devices/sound/ym2610.h
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+
+#ifndef MAME_SOUND_YM2610_H
+#define MAME_SOUND_YM2610_H
+
+#pragma once
+
+#include "ymfm.h"
+#include "ymadpcm.h"
+#include "ay8910.h"
+
+
+// ======================> ym2610_device
+
+DECLARE_DEVICE_TYPE(YM2610, ym2610_device);
+
+class ym2610_device : public ay8910_device, public device_memory_interface
+{
+public:
+ // constructor
+ ym2610_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type = YM2610, u8 opn_mask = 0x36);
+
+ // 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);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual void device_clock_changed() override;
+
+ // memory space configuration
+ virtual space_config_vector memory_space_config() const 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:
+ // ADPCM read/write callbacks
+ u8 adpcm_a_read(offs_t address);
+ u8 adpcm_b_read(offs_t address);
+
+ // internal state
+ address_space_config const m_adpcm_a_config; // address space 0 config (ADPCM-A)
+ address_space_config const m_adpcm_b_config; // address space 1 config (ADPCM-B)
+ std::string const m_adpcm_b_region_name; // name of ADPCM-B memory region
+ optional_memory_region m_adpcm_a_region; // ADPCM-A memory region
+ optional_memory_region m_adpcm_b_region; // ADPCM-B memory region
+ ymopna_engine m_opn; // core OPNA engine
+ ymadpcm_a_engine m_adpcm_a; // ADPCM-A engine
+ ymadpcm_b_engine m_adpcm_b; // ADPCM-B engine
+ sound_stream *m_stream; // sound stream
+ attotime m_busy_duration; // precomputed busy signal duration
+ u16 m_address; // address register
+ u8 const m_opn_mask; // OPN channel mask
+ u8 m_eos_status; // end-of-sample signals
+ u8 m_flag_mask; // flag mask control
+};
+
+
+// ======================> ym2610b_device
+
+DECLARE_DEVICE_TYPE(YM2610B, ym2610b_device);
+
+class ym2610b_device : public ym2610_device
+{
+public:
+ // constructor
+ ym2610b_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+};
+
+
+#endif // MAME_SOUND_YM2610_H