What are Atari DOS 1, DOS 2.0S, DOS 3, DOS 2.5, and DOS XE?
Here are short descriptions of the various Disk Operating Systems (DOS) versions produced by Atari for use with their 8-bit computers. The original Atari DOS shipped with all 810 disk drives from 1979-1981. It consists of a single file, DOS.SYS, which is loaded into memory from disk on startup. At the top of the menu screen it reads: DISK OPERATING SYSTEM 9/24/79 COPYRIGHT 1979 ATARI Unless you are a collector, you probably have no reason to work with DOS 1. Trivia: The “N. DEFINE DEVICE” menu option does not work. The DOS 1 disk is labeled: Atari 810 Master Diskette (CX8101). DOS II Version 2.0S was shipped with all 810 disk drives, and early 1050 disk drives, from 1981-1983. It consists of two files: – DOS.SYS is loaded into memory from disk on startup – DUP.SYS, which contains the DOS menu, is loaded only when needed. MEM.SAV can be employed to preserve the contents of memory to disk when DUP.SYS is loaded, so that the data can be restored to memory when exiting from the DOS menu. D
