Atari DOS
disk operating system
Atari DOS is the disk operating system used with the Atari 8-bit computers. Operating system extensions loaded into memory were required in order for an Atari computer to manage files stored on a disk drive. These extensions to the operating system added the disk handler and other file management features.
The most important extension is the disk handler. In Atari DOS 2.0, this was the File Management System (FMS), an implementation of a file system loaded from a floppy disk. This meant at least an additional 32 KB RAM was needed to run with DOS loaded.
It is accessed by typing "DOS" at the BASIC or Assembler/Editor prompt to exit the cartridge, If DOS isn't loaded, on the 400 and 800, this exits to the memo pad, which is a text editor built into the firmware of those computers, or on XL and XE machines, the self test.
Versions
There were several versions of Atari DOS available, with the first version released in 1979. Atari was using a cross assembler with Data General AOS.
DOS 1.0
In the first version of DOS from Atari, all commands were only accessible from the menu. It was bundled with the Atari 810 disk drives.
“Atari DOS” enters the record as disk operating system. Crown Archives preserves that source wording while asking what Atari, disk and operating can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Aug 19, 2026. The linked authority identifier is Q753609. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1979.
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This entry incorporates text from “Atari DOS” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.