DR-DOS

DR-DOS

DeviceLogics DR-DOS 8.0
Developer	Digital Research Novell Caldera DeviceLogics[1]
OS family	DOS
Working state	Discontinued
Source model	Mixed; primarily closed-source, some versions open-source
Initial release	28 May 1988; 36 years ago (1988-05-28)
Latest release	7.01.08 / 21 July 2011; 13 years ago (2011-07-21)
Available in	English, older versions also in German, French, Italian, Spanish, Japanese
Platforms	x86
Kernel type	Monolithic kernel
Default user interface	Command-line interface (COMMAND.COM)
License	Proprietary
Official website	drdos.com (dead since 2018)

DR-DOS (written as DR DOS, without a hyphen, in versions up to and including 6.0) 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 (which were the same product sold under different names ^{[citation needed]}).

DR-DOS was developed by Gary A. Kildall's Digital Research and derived from Concurrent PC DOS 6.0, which was an advanced successor of CP/M-86. As ownership changed, various later versions were produced with names including Novell DOS and Caldera OpenDOS.