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diff --git a/src/devices/machine/m3002.h b/src/devices/machine/m3002.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/**********************************************************************
+
+ EM Microelectronic-Marin (µem) M 3002 Real Time Clock
+
+***********************************************************************
+ ____ ____
+ Vbb 1 |* \__/ | 16 Vdd
+ XI 2 | | 15 _PULSE
+ XO 3 | | 14 _BUSY
+ _SYNC 4 | | 13 _IRQ
+ R/_W 5 | M 3002 | 12 I/O 3
+ _OE 6 | | 11 I/O 2
+ _CS 7 | | 10 I/O 1
+ Vss 8 |____________| 9 I/O 0
+
+**********************************************************************/
+
+#ifndef MAME_MACHINE_M3002_H
+#define MAME_MACHINE_M3002_H
+
+#pragma once
+
+#include "dirtc.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> m3002_device
+
+class m3002_device : public device_t, public device_nvram_interface, public device_rtc_interface
+{
+public:
+ // device type constructor
+ m3002_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ auto irq_out() { return m_irq_callback.bind(); }
+
+ // 4-bit read/write handlers
+ u8 read();
+ void write(u8 data);
+
+ // status output polling
+ int busy_r() { return internal_busy() ? 0 : 1; }
+ int irq_r() { return m_irq_active ? 0 : 1; }
+
+protected:
+ m3002_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+ // device_t implementation
+ virtual void device_start() override;
+ virtual void device_clock_changed() override;
+
+ // device_nvram_interface implementation
+ virtual bool nvram_read(util::read_stream &file) override;
+ virtual bool nvram_write(util::write_stream &file) override;
+ virtual void nvram_default() override;
+
+ // device_rtc_interface implementation
+ virtual bool rtc_feature_y2k() const override { return false; }
+ virtual bool rtc_feature_leap_year() const override { return true; }
+ virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
+
+private:
+ static const char *const s_register_names[0x10];
+
+ enum class mux_state : u8
+ {
+ INIT,
+ TENS,
+ UNITS
+ };
+
+ // internal helpers
+ bool internal_busy() const;
+ void bcd_increment(u8 location);
+ u8 max_date() const;
+ void watch_update();
+ void alarm_update();
+ void timer_update();
+ void irq_update();
+ void update();
+ TIMER_CALLBACK_MEMBER(second_timer);
+ void set_init_state();
+
+ // callback objects
+ devcb_write_line m_irq_callback;
+
+ // internal state
+ u8 m_ram[16];
+ u8 m_address;
+ mux_state m_mux_state;
+ bool m_irq_active;
+ bool m_update_deferred;
+ emu_timer *m_second_timer;
+};
+
+// ======================> m3000_device
+
+class m3000_device : public m3002_device
+{
+public:
+ // device type constructor
+ m3000_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+};
+
+// device type declarations
+DECLARE_DEVICE_TYPE(M3002, m3002_device)
+DECLARE_DEVICE_TYPE(M3000, m3000_device)
+
+#endif // MAME_MACHINE_M3002_H