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diff --git a/src/devices/bus/tanbus/tandos.h b/src/devices/bus/tanbus/tandos.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Tangerine TANDOS (MT0078)
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_TANBUS_TANDOS_H
+#define MAME_BUS_TANBUS_TANDOS_H
+
+#pragma once
+
+#include "bus/tanbus/tanbus.h"
+#include "imagedev/floppy.h"
+#include "machine/wd_fdc.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class tanbus_tandos_device :
+ public device_t,
+ public device_tanbus_interface
+{
+public:
+ static constexpr feature_type imperfect_features() { return feature::DISK; }
+
+ // construction/destruction
+ tanbus_tandos_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ DECLARE_FLOPPY_FORMATS(floppy_formats);
+
+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 uint8_t read(offs_t offset, int inhrom, int inhram, int be) override;
+ virtual void write(offs_t offset, uint8_t data, int inhrom, int inhram, int be) override;
+ virtual void set_inhibit_lines(offs_t offset, int &inhram, int &inhrom) override;
+
+private:
+ void control_w(uint8_t val);
+ uint8_t status_r();
+ DECLARE_WRITE_LINE_MEMBER(fdc_irq_w);
+ DECLARE_WRITE_LINE_MEMBER(fdc_drq_w);
+ DECLARE_WRITE_LINE_MEMBER(fdc_hld_w);
+
+ required_memory_region m_dos_rom;
+ required_device<fd1793_device> m_fdc;
+ required_device_array<floppy_connector, 4> m_floppies;
+ floppy_image_device *m_floppy;
+
+ uint8_t m_drive_control;
+ int m_irq_enable;
+ int m_drq_enable;
+
+ std::unique_ptr<uint8_t[]> m_ram;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(TANBUS_TANDOS, tanbus_tandos_device)
+
+
+#endif // MAME_BUS_TANBUS_TANDOS_H