!!!Atari DOS II 2.0S Assembly Source Listing
!!Source Code
Thanks to MR.ATARI for scanning and UNIXCOFFEE from AtariAge for editing :-)
\\
{{{
DISK OPERATING SYSTEM (DOS) 19/08/80
;-------------------------------------------------------------------------
;COPYRIGHT (C) 1978,1979,1980,1982
;OPTIMIZED SYSTEMS SOFTWARE,              
;CUPERTINO, CA.                           
;                                         
;THIS PROGRAM MAY NOT BE REPRODUCED,
;STORED IN A RETRIEVAL SYSTEM, OR         
;TRANSMITTED IN WHOLE OR IN PART,         
;IN ANY FORM, OR BY ANY MEANS, BE IT      
;ELECTRONIC, MECHANICAL, PHOTOCOPYING,    
;RECORDING, OR OTHERWISE WITHOUT THE      
;PRIOR WRITTEN PERMISSION OF:             
;                                         
;  OPTIMIZED SYSTEMS SOFTWARE, INC.       
;  10379 LANSDALE AVENUE                  
;  CUPERTINO, CALIFORNIA 95014 (U.S.A.)   
;  PHONE: (408) 446-3099
;
;-------------------------------------------------------------------------
;PROGRAMMER: PAUL LAUGHTON                                                 
;UPDATED:    19-AUG-80                                                     
;------------------------------------------------------------------------- 
;SCANNED:    MR.ATARI   JAN-2004                                           
;------------------------------------------------------------------------- 
;EDITED:     UNIXCOFFEE 16-JUN-2011 (PRETTY PRINTED & FIXED ALL COMMENTS)
;-------------------------------------------------------------------------
}}}

 * [Atari DOS II 2.0S DOS.SYS Assembly Source Listing.txt]

{{{
!!DISK UTILITY PROGRAMS (DUP) 11/18/80 ; VER 2.9
;*************************************************************************
;               THIS IS FINAL VERSION OF DUP  ---- 2.0S ----
;*************************************************************************
;                   FILENAME = DOS2.DUP29Q ON TANDEM
;-------------------------------------------------------------------------
;CHANGED FOR SYSTEM RESET:            DUPFLG                               
;ADDED INTERRUPT ROUTINES FROM SIO:   KB
;ADDED SAVE/RESTORE OF DOSINI VECTOR: KB
;-------------------------------------------------------------------------
;SCANNED BY:                          MR.ATARI   JAN-2004 
;PRETTY PRINTED & FIXED ALL COMMENTS: UNIXcoffee 16-JUN-2011 
;-------------------------------------------------------------------------
}}}

 * [Atari DOS II 2.0S DUP.SYS Assembly Source Listing.txt]

!!ATR-Image
* [Atari DOS II 2.0S Source Listing in MAC/65-format|ATARI_DOS_II_3.0S_with_modified_DUP.SYS.atr] ; DD-format disk with 184 KB ; little modifications for the use with several DD-disk-drives. Please see References below for more details. ; Thanks to AGiambra from AtariAge :-)))

!!TXT-Files
* [Same as above, but as single TXT-files all in one archive|AGiambra.zip] ; size: 37 KB ; Thanks to AGiambra from AtariAge :-)))

!!References
* [Atari DOS II Source Listing on AtariAge|http://atariage.com/forums/topic/221538-dos-20s-dupsys-source-code/page-2]

!!Manuals
* [Atari 810 DOS Utilities Source Listing (DOS II)-DUP.20S C017894.pdf|http://ftp.pigwa.net/stuff/collections/Atari%20documents/Technical%20Documents/] ; size: 46 MB
* [Atari Disk Utilities-Source Listing|http://www.atarimania.com/documents/] ; size: 8.3 MB
!!Images
[{Image src='Atari DOS II Assembly Source Listing 3.jpg' width=429 height=558 }]
Atari DOS II 2.0S Assembly Source Listing - Cover 1 

[{Image src='Atari DOS II Assembly Source Listing 2.jpg' width=323 height=308 }]
Atari DOS II 2.0S Assembly Source Listing - Cover 2