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diff --git a/trunk/src/emu/machine/cdp1852.h b/trunk/src/emu/machine/cdp1852.h
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+/**********************************************************************
+
+ RCA CDP1852 Byte-Wide Input/Output Port emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+ _____ _____
+ CSI/_CSI 1 |* \_/ | 24 Vdd
+ MODE 2 | | 23 _SR/SR
+ DI0 3 | | 22 DI7
+ DO0 4 | | 21 DO7
+ DI1 5 | | 20 DI6
+ DO1 6 | CDP1852 | 19 DO6
+ DI2 7 | | 18 DI5
+ DO2 8 | | 17 DO5
+ DI3 9 | | 16 DI4
+ DO3 10 | | 15 DO4
+ CLOCK 11 | | 14 _CLEAR
+ Vss 12 |_____________| 13 CS2
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __CDP1852__
+#define __CDP1852__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define CDP1852_CLOCK_HIGH 0
+
+#define CDP1852_MODE_INPUT \
+ DEVCB_LINE_GND
+
+#define CDP1852_MODE_OUTPUT \
+ DEVCB_LINE_VCC
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_CDP1852_ADD(_tag, _clock, _config) \
+ MCFG_DEVICE_ADD(_tag, CDP1852, _clock) \
+ MCFG_DEVICE_CONFIG(_config)
+
+
+#define CDP1852_INTERFACE(name) \
+ const cdp1852_interface (name)=
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> cdp1852_interface
+
+struct cdp1852_interface
+{
+ devcb_read_line m_in_mode_cb;
+
+ devcb_read8 m_in_data_cb;
+ devcb_write8 m_out_data_cb;
+
+ devcb_write_line m_out_sr_cb;
+};
+
+
+// ======================> cdp1852_device
+
+class cdp1852_device : public device_t,
+ public cdp1852_interface
+{
+public:
+ // construction/destruction
+ cdp1852_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_READ8_MEMBER( read );
+ DECLARE_WRITE8_MEMBER( write );
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete();
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+ int get_mode();
+ inline void set_sr_line(int state);
+
+ devcb_resolved_read_line m_in_mode_func;
+ devcb_resolved_write_line m_out_sr_func;
+ devcb_resolved_read8 m_in_data_func;
+ devcb_resolved_write8 m_out_data_func;
+
+ int m_new_data; // new data written
+ UINT8 m_data; // data latch
+ UINT8 m_next_data; // next data
+
+ int m_sr; // service request flag
+ int m_next_sr; // next value of service request flag
+
+ // timers
+ emu_timer *m_scan_timer;
+};
+
+
+// device type definition
+extern const device_type CDP1852;
+
+
+
+#endif