DOS 4.0 / QDOS and Source Code

DOS 4.0 (C) 1984 Atari inc.
DOS 4.0 Source Code

Dos 4.0 – Screenshot 01

Dos 4.0 – Screenshot 02

Dos 4.0 – Screenshot 03

Dos 4.0 Source – Screenshot 01

• Also known as “QDOS” or “Antic-DOS”
• Written by Atari, released by Antic
• Menu driven
• XL/XE only
• D0: – D9:
• Supports drive redirection
• Single, enhanced, double, and quad density
• Lacks compatibility with about any DOS
• Feature to read DOS 2 and DOS 3 disks
• Official Source Code

System disk (ATR): DOS 4.0
MyDOS 360KB format (ATR / 7-Zip): Dos 4.0 sources