Initial commit

Initial import of the transcribed source code from Tim Paterson's
DOS listings.

Co-authored-by: RichCini <rich.cini@gmail.com>

3_source_code/MS-DOS_1.25/STDDOS.ASM

@@ -0,0 +1,23 @@
+	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
+
+