How many different DOS discs were there?

[Buyatari]

In the 80s I had an Atari DOS disc that let me copy discs sector by sector in stead of file by file.

I think it was 2.0j or 2.5j

Can't find anything with this name so I might be wrong about the name.

I'm pretty sure it was a hacked version of an existing DOS.

[Rybags]

Long John's Dos probably. Not sure if there was ever a 2.5 compatible one.

 

To do entire disk sector copies it's better to use a dedicated program.

[Gunstar]

Although I have no info to back me up, I'd bet the Atari 8-bit line had more DOS types, versions and hacked variations than any other computer ever. I hazard a guess that I've encountered several dozen different DOS's myself, and I'm sure I've missed some.

Edited September 4, 2017 by Gunstar

[+DrVenkman]

Long John's Dos probably. Not sure if there was ever a 2.5 compatible one.

 

To do entire disk sector copies it's better to use a dedicated program.

 

I have a number of DOS variants including a "DOS 2.5f" that says "Modified by L J Silver"

 

 

In the same archive, there are variants called "DOS 2.6f" and "DOS 2.8f."

[DGS-Atari]

I put a ZIP file up containing DOS 1,3,4, and XE (the unusual and lesser known official DOS versions) in another thread a few months back if anyone needs copies of those:

 

http://atariage.com/forums/topic/265709-need-a-dos-disk/?p=3766500