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diff --git a/src/mame/machine/pc80s31k.h b/src/mame/machine/pc80s31k.h
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+// license:BSD-3-Clause
+// copyright-holders:Angelo Salese
+/***************************************************************************
+
+NEC PC-80S31K
+
+***************************************************************************/
+
+#ifndef MAME_MACHINE_PC80S31K_H
+#define MAME_MACHINE_PC80S31K_H
+
+#pragma once
+
+#include "cpu/z80/z80.h"
+#include "imagedev/floppy.h"
+#include "machine/gen_latch.h"
+#include "machine/i8255.h"
+#include "machine/upd765.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class pc80s31_device : public device_t
+{
+public:
+ // construction/destruction
+ pc80s31_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ void host_map(address_map &map);
+
+protected:
+ pc80s31_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ // device-level overrides
+ //virtual void device_validity_check(validity_checker &valid) const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+ virtual void fdc_io(address_map &map);
+
+ required_device<upd765a_device> m_fdc;
+ required_device_array<floppy_connector, 2> m_floppy;
+ u8 m_irq_vector;
+
+private:
+ required_device<z80_device> m_fdc_cpu;
+ required_memory_region m_fdc_rom;
+ required_device<i8255_device> m_ppi_host;
+ required_device<i8255_device> m_ppi_fdc;
+ required_device_array<generic_latch_8_device, 6> m_latch;
+
+ void fdc_map(address_map &map);
+
+ template <unsigned N> u8 latch_r();
+ template <unsigned N> void latch_w(u8 data);
+
+ u8 terminal_count_r(address_space &space);
+ void motor_control_w(u8 data);
+
+ emu_timer *m_tc_zero_timer;
+
+ IRQ_CALLBACK_MEMBER(irq_cb);
+};
+
+class pc80s31k_device : public pc80s31_device
+{
+public:
+ pc80s31k_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void fdc_io(address_map &map) override;
+
+private:
+ void drive_mode_w(u8 data);
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(PC80S31, pc80s31_device)
+DECLARE_DEVICE_TYPE(PC80S31K, pc80s31k_device)
+
+#endif // MAME_MACHINE_PC80S31K_H