There were many variations with DOS 2. Here are just the most used ones.
; original single density Atari DOS II
; Atari DOS II colored and with new functions
; original double density Atari DOS II for the Atari 815 dual disk drive
; original Atari DOS II version D2.0S (german)
; original Atari DOS II version 2.5
; original Atari DOS II version 2.5 (german)
; Atari DOS II version 2.75 on a SD diskette
; Atari DOS II version 2.75 on a MD diskette
; blank formatted disk with single density and single sided: 90 KB
; blank formatted disk with enhanced density and single sided: 130 KB
; blank formatted disk with double density and single sided: 180 KB
; blank formatted disk with double density and double sided: 360 KB (Atari XF 551 only)
; blank formatted disk with double density and single sided: 180 KB, with 128 byte header for Atari DOS XE
; blank formatted disk with double density and single sided: 180 KB, with 256 byte header for Atari DOS XE
; blank formatted disk for MyDOS: 720 KB
; blank formatted disk SpartaDOS: 720 KB
Version 2.0S (english)
Version 2.5 Atari DOS II manual, text only (english)
Version 2.5 (english)
Version 2.0S (german)
Version 2.5 (german)
Version 2.5 (german) from Erwin Reuss
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