diff --git a/hdr/debug.h b/hdr/debug.h
new file mode 100644
index 0000000..f2ef7f3
--- /dev/null
+++ b/hdr/debug.h
@@ -0,0 +1,110 @@
+/****************************************************************/
+/*                                                              */
+/*                           debug.h                            */
+/*                                                              */
+/*            Routines to assist in debugging the kernel        */
+/*                                                              */
+/*                       January, 2005                          */
+/*                                                              */
+/*                      Copyright (c) 2005                      */
+/*                      FreeDOS kernel dev.                     */
+/*                      All Rights Reserved                     */
+/*                                                              */
+/* This file is part of DOS-C.                                  */
+/*                                                              */
+/* DOS-C is free software; you can redistribute it and/or       */
+/* modify it under the terms of the GNU General Public License  */
+/* as published by the Free Software Foundation; either version */
+/* 2, or (at your option) any later version.                    */
+/*                                                              */
+/* DOS-C is distributed in the hope that it will be useful, but */
+/* WITHOUT ANY WARRANTY; without even the implied warranty of   */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See    */
+/* the GNU General Public License for more details.             */
+/*                                                              */
+/* You should have received a copy of the GNU General Public    */
+/* License along with DOS-C; see the file COPYING.  If not,     */
+/* write to the Free Software Foundation, 675 Mass Ave,         */
+/* Cambridge, MA 02139, USA.                                    */
+/****************************************************************/
+
+#ifndef __DEBUG_H
+#define __DEBUG_H
+
+/* #define DEBUG (usually via 'build debug') to
+   enable debug support.
+   NOTE: this file included by INIT time code and normal
+         resident code, so use care for all memory references
+ */
+ 
+ 
+/* use to limit output to debug builds */
+#ifdef DEBUG
+#define DebugPrintf(x) printf x
+#else
+#define DebugPrintf(x)
+#endif
+
+/* use to disable a chunk of debug output, but
+   keep around for later use.  */
+#define DDebugPrintf(x)
+
+
+/* enable or disable various chunks of debug output */
+
+/* show stored IRQ vectors */
+/* #define DEBUGIRQ */
+
+/* display output during kernel config processing phase */
+/* #define DEBUGCFG */
+#ifdef DEBUGCFG
+#define CfgDbgPrintf(x) printf x
+#else
+#define CfgDbgPrintf(x)
+#endif
+
+/* display info on various DOS functions (dosfns.c) */
+/* #define DEBUGDOSFNS */
+#ifdef DEBUGDOSFNS
+#define DFnsDbgPrintf(x) printf x
+#else
+#define DFnsDbgPrintf(x)
+#endif
+
+/* extra debug output related to chdir */
+/* #define CHDIR_DEBUG */
+
+/* extra debug output related to findfirst */
+/* #define FIND_DEBUG */
+
+/* display info on various DOS directory functions (fatdir.c) */
+/* #define DEBUGFATDIR */
+#ifdef DEBUGFATDIR
+#define FDirDbgPrintf(x) printf x
+#else
+#define FDirDbgPrintf(x)
+#endif
+
+/* extra debug output marking sections */
+/* #define DISPLAY_GETBLOCK */
+
+/* display info on various FAT handling functions (fatfs.c) */
+/* #define DEBUGFATFS */
+#ifdef DEBUGFATFS
+#define FatFSDbgPrintf(x) printf x
+#else
+#define FatFSDbgPrintf(x)
+#endif
+
+
+/* just to be sure printf is declared */
+#if defined(DEBUG) || defined(DEBUGIRQ) || defined(DEBUGCFG) || \
+    defined(DEBUGDOSFNS) || defined(CHDIR_DEBUG) || defined(FIND_DEBUG) || \
+    defined(DEBUGFATDIR) || defined(DEBUGFATFS)
+#ifndef DEBUG_NEED_PRINTF
+#define DEBUG_NEED_PRINTF
+void printf(const char *, ...);
+#endif
+#endif
+
+#endif /* __DEBUG_H */