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diff --git a/src/i_system.h b/src/i_system.h
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+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// $Id: i_system.h 4 2005-07-23 16:19:41Z fraggle $
+//
+// Copyright (C) 1993-1996 by id Software, Inc.
+//
+// This source is available for distribution and/or modification
+// only under the terms of the DOOM Source Code License as
+// published by id Software. All rights reserved.
+//
+// The source is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
+// for more details.
+//
+// DESCRIPTION:
+//	System specific interface stuff.
+//
+//-----------------------------------------------------------------------------
+
+
+#ifndef __I_SYSTEM__
+#define __I_SYSTEM__
+
+#include "d_ticcmd.h"
+#include "d_event.h"
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+
+// Called by DoomMain.
+void I_Init (void);
+
+// Called by startup code
+// to get the ammount of memory to malloc
+// for the zone management.
+byte*	I_ZoneBase (int *size);
+
+
+// Called by D_DoomLoop,
+// returns current time in tics.
+int I_GetTime (void);
+
+
+//
+// Called by D_DoomLoop,
+// called before processing any tics in a frame
+// (just after displaying a frame).
+// Time consuming syncronous operations
+// are performed here (joystick reading).
+// Can call D_PostEvent.
+//
+void I_StartFrame (void);
+
+
+//
+// Called by D_DoomLoop,
+// called before processing each tic in a frame.
+// Quick syncronous operations are performed here.
+// Can call D_PostEvent.
+void I_StartTic (void);
+
+// Asynchronous interrupt functions should maintain private queues
+// that are read by the synchronous functions
+// to be converted into events.
+
+// Either returns a null ticcmd,
+// or calls a loadable driver to build it.
+// This ticcmd will then be modified by the gameloop
+// for normal input.
+ticcmd_t* I_BaseTiccmd (void);
+
+
+// Called by M_Responder when quit is selected.
+// Clean exit, displays sell blurb.
+void I_Quit (void);
+
+
+// Allocates from low memory under dos,
+// just mallocs under unix
+byte* I_AllocLow (int length);
+
+void I_Tactile (int on, int off, int total);
+
+
+void I_Error (char *error, ...);
+
+
+#endif
+//-----------------------------------------------------------------------------
+//
+// $Log$
+// Revision 1.1  2005/07/23 16:20:39  fraggle
+// Initial revision
+//
+//
+//-----------------------------------------------------------------------------