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Microsoft first licensed, then purchased 86-DOS from Seattle Computer Products (SCP), which was modified for the IBM PC by Microsoft employee Bob O'Rear with assistance from SCP (later Microsoft) employee Tim Paterson.
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User manual and diskette for IBM PC DOS 1.1
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In the fall of 1984, IBM gave all the source code and documentation of the internally developed IBM TopView for DOS to Microsoft so that Microsoft could more fully understand how to develop an object-oriented operating environment, overlapping windows (for its development of Windows 2.0) and multitasking. Most of the time branded versions were identical, but there were some cases in which each of the companies made minor modifications to their version of DOS. By 1985 the joint development agreement (JDA) between IBM and Microsoft for the development of PC DOS had each company giving the other company a completely developed version.
At that point in time, either IBM or Microsoft completely developed versions of IBM PC DOS going forward.
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By the time PC DOS 3.0 was completed, IBM had a team of developers covering the full OS. Over the history of IBM PC DOS, various versions were developed by IBM and Microsoft. IBM's expectation proved correct: one survey found that 96.3% of PCs were ordered with the US$40 PC DOS compared to 3.4% with the US$240 CP/M-86. Īlthough IBM expected that most customers would use PC DOS, the IBM PC also supported CP/M-86, which became available six months after PC DOS, and UCSD p-System operating systems. Negotiations continued over the months that followed, and the paperwork was officially signed in early November. IBM first contacted Microsoft to look the company over in July 1980. We went to Microsoft on the proposition that we wanted this to be their product. We had lost a series of suits on this, and so we didn't want to have a product which was clearly someone else's product worked on by IBM people. It could be horribly expensive for us to have our programmers look at code that belonged to someone else because they would then come back and say we stole it and made all this money. We had a terrible problem being sued by people claiming we had stolen their stuff. According to task force member Jack Sams:
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IBM wanted Microsoft to retain ownership of whatever software it developed, and wanted nothing to do with helping Microsoft, other than making suggestions from afar. Microsoft, founded five years earlier by Bill Gates, was eventually selected for the operating system. This radical break from company tradition of in-house development was one of the key decisions that made the IBM PC an industry standard. The IBM task force assembled to develop the IBM PC decided that critical components of the machine, including the operating system, would come from outside vendors. The collective shorthand for PC DOS and MS-DOS was DOS, which is also the generic term for disk operating system, and is shared with dozens of disk operating systems called DOS. Both operating systems were identical or almost identical until 1993, when IBM began selling PC DOS 6.1 with new features. Developed by Microsoft, it was also sold by that company as MS-DOS. It was manufactured and sold by IBM from the early 1980s into the 2000s. IBM PC DOS, an acronym for IBM Personal Computer Disk Operating System, is a discontinued disk operating system for IBM PC compatibles. PC DOS 2000 / April 1998 24 years ago ( 1998-04)Įnglish (US), English (UK), Danish, Dutch, Finnish, French, German, Italian, Norwegian, Portuguese, Russian, Spanish, Swedish