Very soon an IBM-compatible architecture became the goal, and before long all family computers closely emulated IBM's hardware , and only a single version of MS-DOS for a fixed hardware platform was needed for the market. Ironically, the dependence on IBM-compatible hardware caused major problems for the computer industry when the original design had to be changed.
For example, the original design could support no more than kilobytes of memory the KB barrier , because IBM's hardware design reserved the address space above this limit for peripheral devices and ROM.
Manufacturers had to develop complicated schemes EMS and XMS , and other minor proprietary ones to access additional memory. This limitation would not have been a problem if the original idea of interfacing with hardware through MS-DOS had endured. A number of beta versions have surfaced on the Internet, such as 5. An OEM source package for 6. These are not retail versions. MS-DOS originally supported the simple. COM files. MS-DOS version 2. 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 work 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: the Apple II , early Apple Macintosh , the Commodore 64 and others did not use the x processor; many x machines of different architectures used custom versions of MS-DOS. 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. MS-DOS 6. Stac successfully sued Microsoft for patent infringement regarding the compression algorithm used in DoubleSpace. Join or Sign In. Sign in to add and modify your software. Operating Systems Windows. Game added:, dj. That included adopting the Intel microprocessor as the heart of the computer.
PC DOS version 1. Microsoft then substantially rewrote the software to support subdirectories and hard disks; version 2. Microsoft retained the rights to the operating system and licensed it to other computer manufacturers, calling it MS-DOS. To access this material, you must agree to the terms of the license displayed here, which permits only non-commercial use and does not give you the right to license it to third parties by posting copies elsewhere on the web.
We are a c 3 non-profit organization. But they were not able to agree on licensing terms, so IBM left and pursued other options. Version 1. It was the main choice as an operating system for IBM PC-compatible computer systems during the s to mids. MS-DOS was originally designed to run on any computer with an Intel processor, but the various hardware versions on these computers made compatibility difficult. As a result, Microsft provided hardware equipment manufacturers with a development kit that could be used to tune the MS-DOS operating system for the computer's specific hardware.
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