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diff --git a/src/devices/bus/spectrum/specdrum.h b/src/devices/bus/spectrum/specdrum.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Cheetah Marketing SpecDrum emulation
+
+**********************************************************************/
+
+#ifndef MAME_BUS_SPECTRUM_SPECDRUM_H
+#define MAME_BUS_SPECTRUM_SPECDRUM_H
+
+#pragma once
+
+
+#include "exp.h"
+#include "sound/dac.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> spectrum_specdrum_device
+
+class spectrum_specdrum_device :
+ public device_t,
+ public device_spectrum_expansion_interface
+{
+public:
+ // construction/destruction
+ spectrum_specdrum_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+
+ virtual void iorq_w(offs_t offset, uint8_t data) override;
+
+private:
+ required_device<dac_byte_interface> m_dac;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(SPECTRUM_SPECDRUM, spectrum_specdrum_device)
+
+
+#endif // MAME_BUS_SPECTRUM_SPECDRUM_H