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diff --git a/v1.25/source/STDDOS.ASM b/v1.25/source/STDDOS.ASM
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+        TITLE   MS-DOS version 1.25 by Tim Paterson     March 3, 1982
+        PAGE    60,132
+; Use the following booleans to set the switches 
+FALSE   EQU     0
+TRUE    EQU     NOT FALSE
+
+; Use the switches below to produce the standard Microsoft version of the IBM
+; version of the operating system
+MSVER   EQU     TRUE
+IBM     EQU     FALSE
+
+; Set this switch to cause DOS to move itself to the end of memory
+HIGHMEM EQU     FALSE
+
+; Turn on switch below to allow testing disk code with DEBUG. It sets
+; up a different stack for disk I/O (functions > 11) than that used for
+; character I/O which effectively makes the DOS re-entrant.
+
+DSKTEST EQU     FALSE
+
+        INCLUDE MSDOS.ASM
+
+
\ No newline at end of file