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diff --git a/src/devices/machine/mm58174.h b/src/devices/machine/mm58174.h
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+// license:BSD-3-Clause
+// copyright-holders:Raphael Nabet,Sergey Svishchev
+
+#ifndef MAME_MACHINE_MM58174_H
+#define MAME_MACHINE_MM58174_H
+
+#pragma once
+
+#include "dirtc.h"
+
+/***************************************************************************
+ MACROS
+***************************************************************************/
+
+class mm58174_device : public device_t, public device_rtc_interface
+{
+public:
+ mm58174_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ uint8_t read(offs_t offset);
+ void write(offs_t offset, uint8_t data);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+ // device_rtc_interface overrides
+ virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
+ virtual bool rtc_feature_leap_year() const override { return true; }
+
+ void update_rtc();
+
+private:
+ // internal state
+
+ attotime interrupt_period_table(int val);
+
+ int m_control; /* control register (write to address 14) */
+
+ int m_int_ctl; /* interrupt control register */
+
+ int m_years;
+ int m_wday; /* day of the week (1-7 (1=day1 as set in init)) */
+ int m_months1; /* months (BCD: 1-12) */
+ int m_months2;
+ int m_days1; /* days (BCD: 1-31) */
+ int m_days2;
+ int m_hours1; /* hours (BCD : 0-23) */
+ int m_hours2;
+ int m_minutes1; /* minutes (BCD : 0-59) */
+ int m_minutes2;
+ int m_seconds1; /* seconds (BCD : 0-59) */
+ int m_seconds2;
+ int m_tenths; /* tenths of second (BCD : 0-9) */
+
+ emu_timer *m_increment_rtc;
+ emu_timer *m_interrupt_timer;
+};
+
+DECLARE_DEVICE_TYPE(MM58174, mm58174_device)
+
+#endif // MAME_MACHINE_MM58174_H