Atari Dos 4 - QDOS?

[+Larry]

The recent thread about the Turbo Basic 2.0/2.1 on a Dos 4 image got me thinking about this, so I'm curious about this Atari "step child". I have the docs from Carsten's site + the online HELP screens. Is anyone aware of any other history, documentation, utilities, etc.? I'm specifically curious about how the file system is set up, other than it uses blocks as do some other Dos versions like Dos 3 and I think Dos XE. IIRC there is a system utility to read Dos 2.0 disks, but I see nothing about writing directly to a Dos 2 disk.

 

-Larry

[MrFish]

Here are the sources: QDOS - Sources.zip

 

[flashjazzcat]

Seems to use a FAT-like linked list structure but with 8-bit cluster numbers. Interestingly, it also appears to keep a linked list of free sectors in the VTOC, and just pops the first one off the list when it needs to allocate - at least that's how it looks to me.