DR-DOS
Operating system
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DR-DOS is a disk operating system for IBM PC compatibles. Upon its introduction in 1988, it was the first DOS that attempted to be compatible with IBM PC DOS and MS-DOS.
DR-DOS was developed by Gary A. Kildall's Digital Research and derived from... Wikipedia
Available in: English, older versions also in German, French, Italian, Spanish, Japanese
Default user interface: Command-line interface (COMMAND.COM)
Latest release: 7.01.08 / 21 July 2011; 12 years ago
License: Proprietary
OS family: DOS
Source model: Mixed; primarily closed-source, some versions open-source