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diff --git a/src/emu/bus/gamegear/gear2gear.h b/src/emu/bus/gamegear/gear2gear.h
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+/**********************************************************************
+
+ Sega Game Gear "Gear to Gear Port" emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************
+
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __GG_GEAR2GEAR_PORT__
+#define __GG_GEAR2GEAR_PORT__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_GG_GEAR2GEAR_PORT_ADD(_tag, _slot_intf, _def_slot) \
+ MCFG_DEVICE_ADD(_tag, GG_GEAR2GEAR_PORT, 0) \
+ MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+#define MCFG_GG_GEAR2GEAR_PORT_MODIFY(_tag) \
+ MCFG_DEVICE_MODIFY(_tag)
+
+
+#define MCFG_GG_GEAR2GEAR_PORT_TH_INPUT_HANDLER(_devcb) \
+ devcb = &gg_gear2gear_port_device::set_th_input_handler(*device, DEVCB_##_devcb);
+
+
+#define MCFG_GG_GEAR2GEAR_PORT_PIXEL_HANDLER(_devcb) \
+ devcb = &gg_gear2gear_port_device::set_pixel_handler(*device, DEVCB_##_devcb);
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> gg_gear2gear_port_device
+
+class device_gg_gear2gear_port_interface;
+
+class gg_gear2gear_port_device : public device_t,
+ public device_slot_interface
+{
+public:
+ // construction/destruction
+ gg_gear2gear_port_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+ virtual ~gg_gear2gear_port_device();
+
+ // static configuration helpers
+ template<class _Object> static devcb_base &set_th_input_handler(device_t &device, _Object object) { return downcast<gg_gear2gear_port_device &>(device).m_th_pin_handler.set_callback(object); }
+
+ template<class _Object> static devcb_base &set_pixel_handler(device_t &device, _Object object) { return downcast<gg_gear2gear_port_device &>(device).m_pixel_handler.set_callback(object); }
+
+ // Currently, only the support for SMS Controller Adaptor is emulated,
+ // for when SMS Compatibility mode is enabled. In that mode, the 10
+ // pins of the Gear to Gear Port follows the same numbering of a SMS
+ // Control port.
+
+ // Data returned by the port_r methods:
+ // bit 0 - pin 1 - Up
+ // bit 1 - pin 2 - Down
+ // bit 2 - pin 3 - Left
+ // bit 3 - pin 4 - Right
+ // bit 4 - pin 5 - Vcc (no data)
+ // bit 5 - pin 6 - TL (Button 1/Light Phaser Trigger)
+ // bit 6 - pin 7 - TH (Light Phaser sensor)
+ // pin 8 - GND
+ // bit 7 - pin 9 - TR (Button 2)
+ // pin 10 - Not connected
+ //
+ UINT8 port_r();
+ void port_w( UINT8 data );
+
+ void th_pin_w(int state);
+ UINT32 pixel_r();
+
+//protected:
+ // device-level overrides
+ virtual void device_start();
+
+ device_gg_gear2gear_port_interface *m_device;
+
+private:
+ devcb_write_line m_th_pin_handler;
+ devcb_read32 m_pixel_handler;
+};
+
+
+// ======================> device_gg_gear2gear_port_interface
+
+// class representing interface-specific live sms_expansion card
+class device_gg_gear2gear_port_interface : public device_slot_card_interface
+{
+public:
+ // construction/destruction
+ device_gg_gear2gear_port_interface(const machine_config &mconfig, device_t &device);
+ virtual ~device_gg_gear2gear_port_interface();
+
+ virtual UINT8 peripheral_r() { return 0xff; };
+ virtual void peripheral_w(UINT8 data) { };
+
+protected:
+ gg_gear2gear_port_device *m_port;
+};
+
+
+// device type definition
+extern const device_type GG_GEAR2GEAR_PORT;
+
+
+SLOT_INTERFACE_EXTERN( gg_gear2gear_port_devices );
+
+
+#endif