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diff --git a/src/devices/bus/spectrum/beta.h b/src/devices/bus/spectrum/beta.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/*********************************************************************
+
+ Technology Research Beta 128 Disk interface
+
+*********************************************************************/
+#ifndef MAME_BUS_SPECTRUM_BETA_H
+#define MAME_BUS_SPECTRUM_BETA_H
+
+#include "exp.h"
+#include "softlist.h"
+#include "imagedev/floppy.h"
+#include "machine/wd_fdc.h"
+#include "formats/trd_dsk.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class spectrum_beta128_device :
+ public device_t,
+ public device_spectrum_expansion_interface
+
+{
+public:
+ // construction/destruction
+ spectrum_beta128_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ DECLARE_FLOPPY_FORMATS(floppy_formats);
+ DECLARE_INPUT_CHANGED_MEMBER(magic_button);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual ioport_constructor device_input_ports() const override;
+
+ virtual void opcode_fetch(offs_t offset) override;
+ virtual uint8_t mreq_r(offs_t offset) override;
+ virtual void mreq_w(offs_t offset, uint8_t data) override;
+ virtual uint8_t iorq_r(offs_t offset) override;
+ virtual void iorq_w(offs_t offset, uint8_t data) override;
+ virtual DECLARE_READ_LINE_MEMBER(romcs) override;
+
+ required_memory_region m_rom;
+ required_device<fd1793_device> m_fdc;
+ required_device_array<floppy_connector, 4> m_floppy;
+ required_device<spectrum_expansion_slot_device> m_exp;
+ required_ioport m_switch;
+
+ int m_romcs;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(SPECTRUM_BETA128, spectrum_beta128_device)
+
+
+#endif // MAME_BUS_SPECTRUM_BETA_H