The SHARE command was not needed anymore for old DOS 1.x style FCB file API to partitions over 32 MB. 61 60 First version to get the HIMEM.SYS driver and load portions of the operating system into the upper memory area and high memory area.

For other compatible operating systems of the DOS family, see DOS.

Collectively, MS-DOS, its rebranding as IBM PC DOS, and some operating systems attempting to be compatible with MS-DOS, are sometimes referred to as DOS (which is also the generic acronym for disk operating system ).

Although MS-DOS and PC DOS were initially developed in parallel by Microsoft and IBM, the two products diverged after twelve years, in 1993, with recognizable differences in compatibility, syntax, and capabilities.

Progressive version releases delivered support for other mass storage media in ever greater sizes and formats, along with added feature support for newer processors and rapidly evolving computer architectures.

Powermenu For Msdos Software Development Firm

Ultimately, it was the key product in Microsofts development from a programming language company to a diverse software development firm, providing the company with essential revenue and marketing resources.

It was also the underlying basic operating system on which early versions of Windows ran as a GUI.

Development of 86-DOS took only six weeks, as it was basically a clone of Digital Research s CPM (for 8080Z80 processors), ported to run on 8086 processors and with two notable differences compared to CPM: an improved disk sector buffering logic, and the introduction of FAT12 instead of the CPM filesystem.

This first version was shipped in August 1980.

Microsoft, which needed an operating system for the IBM Personal Computer, 8 9 hired Tim Paterson in May 1981 and bought 86-DOS 1.10 for US 75,000 in July of the same year.

Each computer would have its own distinct hardware and its own version of MS-DOS, similar to the situation that existed for CPM, and with MS-DOS emulating the same solution as CPM to adapt for different hardware platforms.

To this end, MS-DOS was designed with a modular structure with internal device drivers (the DOS BIOS ), minimally for primary disk drives and the console, integrated with the kernel and loaded by the boot loader, and installable device drivers for other devices loaded and integrated at boot time.

The OEM would use a development kit provided by Microsoft to build a version of MS-DOS with their basic IO drivers and a standard Microsoft kernel, which they would typically supply on disk to end users along with the hardware.

Thus, there were many different versions of MS-DOS for different hardware, and there is a major distinction between an IBM-compatible (or ISA) machine and an MS-DOS compatible machine.

Some machines, like the Tandy 2000, were MS-DOS compatible but not IBM-compatible, so they could run software written exclusively for MS-DOS without dependence on the peripheral hardware of the IBM PC architecture.

However, in MS-DOSs early days, the greater speed attainable by programs through direct control of hardware was of particular importance, especially for games, which often pushed the limits of their contemporary hardware.

Very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBMs hardware, and only a single version of MS-DOS for a fixed hardware platform was needed for the market.

This version is the version of MS-DOS that is discussed here, as the dozens of other OEM versions of MS-DOS were only relevant to the systems they were designed for, and in any case were very similar in function and capability to some standard version for the IBM PCoften the same-numbered version, but not always, since some OEMs used their own proprietary version numbering schemes (e.g.

MS-DOS 1.x as 2.0 or vice versa)with a few notable exceptions.

Believing that it could not compete with ATT in the Unix market, Microsoft abandoned Xenix, and in 1987 transferred ownership of Xenix to the Santa Cruz Operation (SCO).

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They were produced by the East German electronics manufacturer VEB Robotron.

It is unrelated to any later versions, including versions 4.00 and 4.01 listed below.

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First version to introduce volume serial number when formatting hard disks and floppy disks (Disk duplication also nb 3 and when using SYS to make a floppy disk or a partition of a hard drive bootable); 63 Release date: April, 1989 64.

First version to support 3.5-inch, 2.88 MB floppy drives and diskettes.

The SHARE command was not needed anymore for old DOS 1.x style FCB file API to partitions over 32 MB.

First version to get the HIMEM.SYS driver and load portions of the operating system into the upper memory area and high memory area.