MS-DOS was the main operating system for IBM PC compatible personal computers during the s and the early s, when it was gradually superseded by operating systems offering a graphical user interface GUIin various generations of the graphical Microsoft Windows operating system. Microsoft acquired the rights to meet IBM specifications.
During its lifetime, several competing products were released for the x86 platform,  and MS-DOS went through eight versions, until development ceased in 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. Ultimately it was the key product in Microsoft's growth 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.
It is a flexible operating system, and consumes negligible installation space. This first version was shipped in August To this end, MS-DOS was designed with a modular structure with internal device drivers, 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.
However, in MS-DOS's 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 family computers closely emulated IBM's hardwareand 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 PC—often the same-numbered version, but not always, since some OEMs used their own proprietary version numbering schemes e.
MS-DOS originally supported the simple. EXE executable file format. Most of the machines in the early days of MS-DOS had differing system architectures and there was a certain degree of incompatibility, and subsequently vendor lock-in.
Users who began using MS-DOS with their machines were compelled to continue using the version customized for their hardware, or face trying to get all of their proprietary hardware and software to Que es el sistema operativo ms dos yahoo dating with the new system. In the business world the x-based machines that MS-DOS was tied to faced competition from the Unix operating system which ran on many different hardware architectures. Microsoft itself sold a version of Unix for the PC called Xenix.
In the emerging world of home users, a variety of other computers based on various other processors were in serious competition with the IBM PC: At first all these machines were in competition. In time the IBM PC hardware configuration became dominant in the x market as software written to communicate directly with the PC hardware without using standard operating system calls ran much faster, but on true PC-compatibles only.
Most clones cost much less than IBM-branded machines of similar performance, and became widely used by home users, while IBM PCs had a large share of the business computer market.
MS-DOS had grown in spurts, with many significant features being taken or duplicated from Microsoft's other products and operating systems. There will be some similar features. In the due diligence process, Stac engineers had shown Microsoft part of the Stacker source code. Stac was unwilling to meet Microsoft's terms for licensing Stacker and withdrew from the negotiations. Microsoft chose to license Vertisoft's DoubleDisk, using it as the core for its DoubleSpace disk compression.
Stac successfully sued Microsoft for patent infringement regarding the compression algorithm used in DoubleSpace. Shortly afterwards came version 6.
The largest manufacturers used the per-processor arrangement, which had the lowest fee. This arrangement made it expensive for the large manufacturers to migrate to any other operating system, such as DR DOS.