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diff --git a/src/devices/bus/c64/4tba.h b/src/devices/bus/c64/4tba.h
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+// license:BSD-3-Clause
+// copyright-holders:smf
+/**********************************************************************
+
+ Starbyte Software Tie Break Adaptor emulation
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __C64_4TBA__
+#define __C64_4TBA__
+
+
+#include "emu.h"
+#include "user.h"
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> c64_4tba_device
+
+class c64_4tba_device : public device_t,
+ public device_pet_user_port_interface
+{
+public:
+ // construction/destruction
+ c64_4tba_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // optional information overrides
+ virtual ioport_constructor device_input_ports() const;
+
+ // device_pet_user_port_interface overrides
+ virtual WRITE_LINE_MEMBER( input_4 ) { output_6(state); }
+ virtual WRITE_LINE_MEMBER( input_6 ) { output_4(state); }
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+};
+
+
+// device type definition
+extern const device_type C64_4TBA;
+
+
+#endif