DoubleDOS was a

computer program A computer program is a sequence or set of instructions in a programming language for a computer to execute. Computer programs are one component of software, which also includes documentation and other intangible components. A computer program ...

that extended the

IBM PC DOS IBM PC DOS, an acronym for IBM Personal Computer Disk Operating System, is a discontinued disk operating system for IBM PC compatibles. It was manufactured and sold by IBM from the early 1980s into the 2000s. Developed by Microsoft, it was also ...

operating system with limited multitasking capabilities. The program partitioned the computer's memory in two, running an instance of DOS in both, and allowed users to switch between the two. DoubleDOS was announced in 1984 by a firm called Softlogic Solutions, and sold for

USD The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official ...

299. In a 1987 ad, the company offered the software for USD49.99, pitting it against competitors

TopView TopView is the first object-oriented, multitasking, and windowing, personal computer operating environment for PC DOS developed by IBM, announced in August 1984 and shipped in March 1985. TopView provided a text-mode (although it also ran in gr ...

and

Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for serv ...

. A review in 1986's ''Business Software'' found programs running under DoubleDOS ran considerably slower, "even when nothing is running in the other partition".

References

DOS extenders {{DOS-stub

See also

References