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diff --git a/src/devices/sound/gt155.h b/src/devices/sound/gt155.h
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+// license:BSD-3-Clause
+// copyright-holders: Devin Acker
+
+/***************************************************************************
+ Casio GT155 (HG51B155FD)
+***************************************************************************/
+
+#ifndef MAME_SOUND_GT155_H
+#define MAME_SOUND_GT155_H
+
+#pragma once
+
+#include "dirom.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class gt155_device : public device_t,
+ public device_sound_interface,
+ public device_rom_interface<23>
+{
+public:
+ static constexpr feature_type imperfect_features() { return feature::SOUND; }
+
+ // construction/destruction
+ gt155_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
+
+ void write(offs_t offset, u8 data);
+ u8 read(offs_t offset);
+
+protected:
+ // device_t overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+ virtual void device_clock_changed() override;
+
+ // device_sound_interface overrides
+ virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
+
+ // device_rom_interface overrides
+ virtual void rom_bank_pre_change() override;
+
+private:
+ static constexpr unsigned CLOCKS_PER_SAMPLE = 512;
+ static constexpr unsigned ENV_SHIFT = 8;
+
+ struct voice_t
+ {
+ u8 m_enable = 0;
+ u8 m_format = 0;
+
+ u32 m_addr = 0;
+ u32 m_addr_frac = 0;
+ u32 m_addr_end = 0;
+ u32 m_addr_loop = 0;
+ u32 m_addr_loop_frac = 0;
+
+ u32 m_pitch = 0;
+
+ u32 m_filter_gain = 0;
+ u16 m_filter = 0;
+ s16 m_filter_out = 0;
+ u16 m_filter_unk = 0;
+
+ s16 m_sample_last = 0;
+ s16 m_sample = 0;
+
+ u32 m_env_current = 0;
+ u32 m_env_target = 0;
+ u16 m_env_level = 0;
+ u8 m_env_scale = 0;
+ u16 m_env_rate = 0;
+
+ u8 m_balance[2] = {0};
+ u8 m_dsp_send[2] = {0};
+
+ void update_envelope();
+ };
+
+ void mix_sample(voice_t &voice, s64 &left, s64 &right);
+ void update_sample(voice_t &voice);
+
+ u16 reg16(u8 num) const;
+ u32 reg24(u8 num) const;
+ u32 reg32(u8 num) const;
+
+ void voice_command(u8 data);
+
+ sound_stream *m_stream;
+
+ u16 m_volume[0x800];
+
+ u8 m_data[6];
+ u32 m_dsp_data[128];
+ u32 m_rom_addr;
+
+ voice_t m_voices[32];
+};
+
+DECLARE_DEVICE_TYPE(GT155, gt155_device)
+
+#endif // MAME_SOUND_GT155_H