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diff --git a/src/devices/machine/upd4991a.h b/src/devices/machine/upd4991a.h
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+// license:BSD-3-Clause
+// copyright-holders: Angelo Salese
+/***************************************************************************
+
+ uPD4991a RTC
+
+***************************************************************************/
+
+#ifndef MAME_MACHINE_UPD4991A_H
+#define MAME_MACHINE_UPD4991A_H
+
+#pragma once
+
+#include "dirtc.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> upd4991a_device
+
+class upd4991a_device : public device_t, public device_rtc_interface
+{
+public:
+ // construction/destruction
+ upd4991a_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ // I/O operations
+ void address_w(offs_t offset, u8 data);
+ u8 data_r(offs_t offset);
+ void data_w(offs_t offset, u8 data);
+
+protected:
+ // device-level overrides
+ virtual void device_validity_check(validity_checker &valid) const override;
+ virtual void device_start() override;
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+ virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
+
+private:
+ enum
+ {
+ TIMER_CLOCK
+ //TIMER_TP,
+ //TIMER_DATA_OUT,
+ //TIMER_TEST_MODE
+ };
+
+ emu_timer *m_timer_clock;
+ u8 m_rtc_regs[8];
+ u8 m_address;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(UPD4991A, upd4991a_device)
+
+#endif // MAME_MACHINE_UPD4991A_H