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Virtual DOS machines can operate either exclusively through typical software emulation methods (e.g. dynamic recompilation) or can rely on the virtual 8086 mode of the Intel 80386 processor, which allows real mode 8086 software to run in a controlled environment by catching all operations which involve accessing protected hardware and forwarding them to the normal operating system (as exceptions).
Phar Lap Software, Inc., was a software company specializing in software development tools for DOS operating systems. The company was named after the champion New Zealand racehorse Phar Lap . They were most noted for their software allowing developers to access memory beyond the 640 KiB limit of DOS ( DOS extenders ) and were an author of the ...
Multiuser DOS is a real-time multi-user multi-tasking operating system for IBM PC-compatible microcomputers.. An evolution of the older Concurrent CP/M-86, Concurrent DOS and Concurrent DOS 386 operating systems, it was originally developed by Digital Research and acquired and further developed by Novell in 1991.
In other words, Phar Lap created an OS/2 compatibility box for DOS. A 16-bit protected-mode DOS application can be built by compiling it with Microsoft C under DOS, specifying that an OS/2 program should be built, and then executing the resulting file on DOS with the aid of 286|DOS-Extender. With Lotus and Microsoft using DOS extenders, an ...
Concurrent DOS 286, Concurrent DOS 68K and FlexOS were designed by Francis "Frank" R. Holsworth (using siglum FRH). [5] [6] Like Portable CP/M, Concurrent DOS 286, Concurrent DOS 68K and Concurrent DOS V60, [1] [7] FlexOS was written in C for higher portability across hardware platforms, and it featured very low interrupt latency and fast context switching.
The Multiuser DOS Federation (MDOS) was an industry alliance to promote the growth and acceptance of multi-user DOS-based solutions on 286, 386 and 486 computers. [1] [2] It was formed in July 1990. [1] Initially among them were Digital Research, Theos Software, SunRiver, DigiBoard, Alloy, Viewport International and others. [2]
DOS (/ d ɒ s /, / d ɔː s /) is a family of disk-based operating systems for IBM PC compatible computers. [1] The DOS family primarily consists of IBM PC DOS and a rebranded version, Microsoft's MS-DOS, both of which were introduced in 1981.
Concurrent DOS 286 1.x FlexOS 1.00-2.34 (derivative of Concurrent DOS 286) FlexOS 186 (variant of FlexOS for terminals) FlexOS 286 (variant of FlexOS for hosts) Siemens S5-DOS/MT (industrial control system based on FlexOS) IBM 4680 OS (POS operating system based on FlexOS) IBM 4690 OS (POS operating system based on FlexOS)