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diff --git a/src/devices/bus/cbus/pc9801_55.h b/src/devices/bus/cbus/pc9801_55.h
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+// license:BSD-3-Clause
+// copyright-holders:Angelo Salese
+/***************************************************************************
+
+ NEC PC-9801-55/-55U/-55L
+
+***************************************************************************/
+
+#ifndef MAME_BUS_CBUS_PC9801_55_H
+#define MAME_BUS_CBUS_PC9801_55_H
+
+#pragma once
+
+#include "bus/cbus/pc9801_cbus.h"
+#include "bus/nscsi/devices.h"
+#include "machine/nscsi_bus.h"
+#include "machine/wd33c9x.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> pc9801_118_device
+
+class pc9801_55_device : public device_t
+{
+public:
+ // construction/destruction
+ //pc9801_55_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ pc9801_55_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+ DECLARE_WRITE_LINE_MEMBER(scsi_irq_w);
+
+protected:
+ // device-level overrides
+ virtual void device_validity_check(validity_checker &valid) const override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ // optional information overrides
+// virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+
+private:
+ required_device<pc9801_slot_device> m_bus;
+ required_device<nscsi_bus_device> m_scsi_bus;
+ required_device<wd33c9x_base_device> m_wdc;
+
+ u8 comms_r(offs_t offset);
+ void comms_w(offs_t offset, u8 data);
+};
+
+class pc9801_55u_device : public pc9801_55_device
+{
+public:
+ pc9801_55u_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+private:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+};
+
+class pc9801_55l_device : public pc9801_55_device
+{
+public:
+ pc9801_55l_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+private:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+};
+
+// device type definition
+//DECLARE_DEVICE_TYPE(PC9801_55, pc9801_55_device)
+DECLARE_DEVICE_TYPE(PC9801_55U, pc9801_55u_device)
+DECLARE_DEVICE_TYPE(PC9801_55L, pc9801_55l_device)
+
+#endif // MAME_BUS_CBUS_PC9801_55_H