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Because Microsoft already sells in Europe a multitasking version of DOS, which is called DOS 4.0, it is not clear if Microsoft will use a different version number for the new operating system. [358] IBM also ships OS/2 Extended Edition 1.0, which adds the IBM-developed components Communications Manager and Database Manager.
MS-DOS went through eight versions, until development ceased in 2000; version 6.22 from 1994 was the final standalone version, with versions 7 and 8 serving mostly in the background for loading Windows 9x.
Each computer would have its own distinct hardware and its own version of MS-DOS, a situation similar to the one that existed for CP/M, with MS-DOS emulating the same solution as CP/M to adapt for different hardware platforms. So there were many different original equipment manufacturer (OEM) versions of MS-DOS for different hardware. But the ...
This version of DOS supports preemptive multitasking, shared memory, device helper services and New Executable ("NE") format executables. None of these features were used in later versions of DOS, but they were used to form the basis of the OS/2 1.0 kernel. This version of DOS is distinct from the widely released PC DOS 4.0 which was developed ...
Amiga Unix 2.01 (Latest stable release) AmigaOS 3.0; BSD/386, by BSDi and later known as BSD/OS. LGX; OpenVMS V1.0 (First OpenVMS AXP (Alpha) specific version, November 1992) OS/2 2.0 (First i386 32-bit based version) Plan 9 First Edition (First public release was made available to universities) RSTS/E 10.1 (Last stable release, September 1992) SLS
PC DOS remained a rebranded version of MS-DOS until 1993. IBM and Microsoft parted ways—MS-DOS 6 was released in March, and PC DOS 6.1 (separately developed) followed in June. Most of the new features from MS-DOS 6.0 appeared in PC DOS 6.1 including the new boot menu support and the new commands CHOICE, DELTREE, and MOVE.
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IBM PC DOS (since 1981), rebranded OEM version of MS-DOS sold by IBM. Identical or almost identical to MS-DOS until PC DOS version 6; DR-DOS (since 1988), MS-DOS-compatible operating system originally developed by Digital Research; ROM-DOS (1989), MS-DOS clone by Datalight; PTS-DOS (since 1993), MS-DOS clone developed in Russia by PhysTechSoft