!!! Atari DOS 2 or DOS II Version 2.x There were many variations with DOS 2. Here are just the most used ones. !!Reference * [Wikipedia: Atari DOS|http://en.wikipedia.org/wiki/Atari_DOS] !!Manuals * [The Atari 810 Disk Drive-An Introduction To The Disk Operating System.pdf] Version 2.0S (english) * [Atari DISK OPERATING SYSTEM 2.5 Manual.txt] Version 2.5 Atari DOS II manual, text only (english) * [Atari DOS 2.5-XF551.pdf] Version 2.5 (english) * [Das Atari 810 Plattenlaufwerk.pdf] Version 2.0S (german) * [Atari Diskettenlaufwerk-DOS 2.5-XF551.pdf] Version 2.5 (german) * [XF551 Formate.pdf] Version 2.5 (german) from Erwin Reuss !!ATR-Images * [Atari DOS II Vers. 2.0S.atr] ; original single density Atari DOS II * [Atari DOS II Vers. 2.0S enhanced|DOS 2.0S enhanced.atr] ; Atari DOS II colored and with new functions * [Atari DOS II Vers. 2.0D.atr] ; original double density Atari DOS II for the Atari 815 dual disk drive * [Atari_DOS_II_D2.0S-offizielles_deutsches_Atari_DOS.atr] ; original Atari DOS II version D2.0S (german) * [Atari DOS II Vers. 2.5.atr] ; original Atari DOS II version 2.5 * [Atari DOS II Vers. 2.5 deutsch.atr] ; original Atari DOS II version 2.5 (german) * [Atari DOS II Vers. 2.75 SD|DOS_2.75_SD.atr] ; Atari DOS II version 2.75 on a SD diskette * [Atari DOS II Vers. 2.75 MD|DOS_2.75_MD.atr] ; Atari DOS II version 2.75 on a MD diskette * [90KB.atr] ; blank formatted disk with single density and single sided: 90 KB * [130KB.atr] ; blank formatted disk with enhanced density and single sided: 130 KB * [180KB.atr] ; blank formatted disk with double density and single sided: 180 KB * [360KB.atr] ; blank formatted disk with double density and double sided: 360 KB (Atari XF 551 only) * [SSDD128 DOS XE.atr] ; blank formatted disk with double density and single sided: 180 KB, with 128 byte header for Atari DOS XE * [SSDD256 DOS XE.atr] ; blank formatted disk with double density and single sided: 180 KB, with 256 byte header for Atari DOS XE * [720K MyDOS-2.atr] ; blank formatted disk for MyDOS: 720 KB * [720K SpartaDOS.atr] ; blank formatted disk SpartaDOS: 720 KB