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diff --git a/private/ntos/inc/memprint.h b/private/ntos/inc/memprint.h
new file mode 100644
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+++ b/private/ntos/inc/memprint.h
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+/*++ BUILD Version: 0001    // Increment this if a change has global effects
+
+Copyright (c) 1990  Microsoft Corporation
+
+Module Name:
+
+    memprint.h
+
+Abstract:
+
+    Include file for in-memory DbgPrint function.  Including this file
+    will change DbgPrints to a routine which puts the display text in a
+    circular buffer in memory.  By default, the text is then sent to the
+    console via DbgPrint.  By changing the value of the MemPrintFlags
+    flag, however, the text may be routed to a file instead, thereby
+    significantly speeding up the DbgPrint operation.
+
+Author:
+
+    David Treadwell (davidtr) 05-Oct-1990
+
+Revision History:
+
+--*/
+
+#ifndef _MEMPRINT_
+#define _MEMPRINT_
+
+#define MEM_PRINT_FLAG_CONSOLE     0x01
+#define MEM_PRINT_FLAG_FILE        0x02
+#define MEM_PRINT_FLAG_HEADER      0x04
+
+extern ULONG MemPrintFlags;
+
+#ifdef MIPS
+#define MEM_PRINT_DEF_BUFFER_SIZE 16384
+#else
+#define MEM_PRINT_DEF_BUFFER_SIZE 65536
+#endif
+
+//
+// The subbuffer count is the number of subbuffers within the circular
+// buffer.  A subbuffer is the method used to buffer data between
+// MemPrint and writing to disk--when a subbuffer is filled, its
+// contents are written to the log file.  This value should be a power
+// of two between two and sixty-four (two is necessary to allow writing
+// to disk and RAM simultaneously, sixty-four is the maximum number of
+// things a thread can wait on at once).
+//
+//
+
+#define MEM_PRINT_DEF_SUBBUFFER_COUNT 16
+#define MEM_PRINT_MAX_SUBBUFFER_COUNT 64
+
+#define MEM_PRINT_LOG_FILE_NAME "\\SystemRoot\\Logfile"
+
+//
+// Exported routines.  MemPrintInitialize sets up the circular buffer
+// and other memory, MemPrint writes text to the console and/or a
+// log file, and MemPrintFlush writes the current subbuffer to disk
+// whether or not it is full.
+//
+
+VOID
+MemPrintInitialize (
+    VOID
+    );
+
+VOID
+MemPrint (
+    CHAR *Format, ...
+    );
+
+VOID
+MemPrintFlush (
+    VOID
+    );
+
+#define DbgPrint MemPrint
+
+#endif // def _MEMPRINT_