Atari DOS 2
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Atari DOS 2 or DOS II Version 2.x
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There were many variations with DOS 2. Here are just the most used ones.
Reference
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Wikipedia: Atari DOS
Manuals
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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
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Atari DOS II Vers. 2.0S.atr
original single density Atari DOS II
Atari DOS II Vers. 2.0D.atr
original double density Atari DOS II for the Atari 815 dual disk drive
Atari DOS II Vers. 2.5.atr
original Atari DOS version 2.5
Atari DOS II Vers. 2.5 deutsch.atr
original Atari DOS version 2.5 (german)
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