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diff --git a/trunk/src/emu/machine/ds1302.h b/trunk/src/emu/machine/ds1302.h
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+++ b/trunk/src/emu/machine/ds1302.h
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+/**********************************************************************
+
+ Dallas DS1302 Trickle-Charge Timekeeping Chip emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+ _____ _____
+ Vcc2 1 |* \_/ | 8 Vcc1
+ X1 2 | | 7 SCLK
+ X2 3 | | 6 I/O
+ GND 4 |_____________| 5 CE
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __DS1302_H__
+#define __DS1302_H__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_DS1302_ADD(_tag, _clock) \
+ MCFG_DEVICE_ADD(_tag, DS1302, _clock)
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> ds1302_device
+
+class ds1302_device : public device_t,
+ public device_rtc_interface,
+ public device_nvram_interface
+{
+public:
+ // construction/destruction
+ ds1302_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_WRITE_LINE_MEMBER( ce_w );
+ DECLARE_WRITE_LINE_MEMBER( sclk_w );
+ DECLARE_WRITE_LINE_MEMBER( io_w );
+ DECLARE_READ_LINE_MEMBER( io_r );
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+ // device_nvram_interface overrides
+ virtual void nvram_default();
+ virtual void nvram_read(emu_file &file);
+ virtual void nvram_write(emu_file &file);
+
+ // 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);
+ virtual bool rtc_feature_leap_year() { return true; }
+
+private:
+ void load_shift_register();
+ void input_bit();
+ void output_bit();
+
+ int m_ce;
+ int m_clk;
+ int m_io;
+ int m_state;
+ int m_bits;
+ UINT8 m_cmd;
+ UINT8 m_data;
+ int m_addr;
+
+ UINT8 m_reg[9];
+ UINT8 m_user[9];
+ UINT8 m_ram[0x20];
+
+ // timers
+ emu_timer *m_clock_timer;
+};
+
+
+// device type definition
+extern const device_type DS1302;
+
+
+
+#endif