Editing IBM PC DOS (section)

==History==
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. This radical break from company tradition of in-house development was one of the key decisions that made the IBM PC an industry standard. [[Microsoft]], founded five years earlier by [[Bill Gates]], was eventually selected for the operating system.

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. According to task force member Jack Sams: 
<blockquote>The reasons were internal. We had a terrible problem being sued by people claiming we had stolen their stuff. 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 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. We went to Microsoft on the proposition that we wanted this to be their product.<ref name="Jakobsen"/>{{Citation needed|date=July 2016|reason=Parts of this source can be found in at least two books published in 2015 ([https://books.google.com/books?id=B1SNBQAAQBAJ&pg=PT269&lpg=PT269] [https://books.google.com/books?id=a2l9DwAAQBAJ&pg=PA34&lpg=PA34]), but they don't cite the origin of their source, so it's possible that they sourced Jack Sams's citation from Wikipedia.}}</blockquote>

IBM first contacted Microsoft to look the company over in July 1980. Negotiations continued over the months that followed, and the paperwork was officially signed in early November.<ref name="Wallace_1992"/>

Although IBM expected that most customers would use PC&nbsp;DOS,<ref name="Bunnell_1982"/> the IBM PC also supported [[CP/M-86]], which became available six months after PC&nbsp;DOS,<ref name="Edlin_1982"/> and [[UCSD p-System]] operating systems.<ref name="Lemmons_1981"/> IBM's expectation proved correct: one survey found that 96.3% of PCs were ordered with the $40 PC&nbsp;DOS compared to 3.4% with the $240 CP/M-86.<ref name="Pcommuniques_1983"/>

Over the history of IBM PC&nbsp;DOS, various versions were developed by IBM and Microsoft. By the time PC&nbsp;DOS 3.0 was completed, IBM had a team of developers covering the full OS. At that point in time, either IBM or Microsoft completely developed versions of IBM PC&nbsp;DOS going forward. By 1985, the joint development agreement (JDA) between IBM and Microsoft for the development of PC&nbsp;DOS had each company giving the other company a completely developed version. 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. 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 [[Computer multitasking|multitasking]].

===Version history===
{| class="wikitable"
|-
! Version !! Release date !! References
|-
| 1.0 || August 12, 1981 || <ref>{{cite press release |url=https://minuszerodegrees.net/5150/doco/IBM%20Product%20Announcement%20-%20IBM%20PC%205150.pdf |title=Product Announcement: The IBM Personal Computer |publisher=[[IBM]] |location=White Plains, New York |date=August 12, 1981 |access-date=February 8, 2023}}</ref>
|-
| 1.1 (1.10) || May 7, 1982 || <ref>{{cite web |url=https://thestarman.pcministry.com/DOS/ibm110 |title=IBM Personal Computer DOS Version 1.1.0 (1982) |first=Daniel |last=Sedory |publisher=The Starman's Realm |date=August 13, 2008 |access-date=February 8, 2023}}</ref>
|-
| 2.0 || March 8, 1983 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS283-034 |type=Announcement letter |id=283-034 |title=IBM Personal Computer DOS Version 2 And IBM Personal Computer BASIC Language Extensions Version 2 Are Now Available 6024061 |publisher=[[IBM]] |date=March 8, 1983 |access-date=January 19, 2025}}</ref>
|-
| 2.1 (2.10) || November 1, 1983 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS283-389 |type=Announcement letter |id=283-389 |title=IBM Personal Computer DOS Version 2.1 Announced And Available |publisher=[[IBM]] |date=November 1, 1983 |access-date=January 19, 2025}}</ref>
|-
| 3.0 || September 14, 1984 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS284-283 |type=Announcement letter |id=284-283 |title=IBM Personal Computer DOS Version 3.0 |publisher=[[IBM]] |date=August 14, 1984 |access-date=January 19, 2025}}</ref>
|-
| 3.1 (3.10) || April 2, 1985 || <ref>{{cite web |url=https://www.pcjs.org/software/pcx86/sys/dos/ibm/3.10 |title=IBM PC DOS 3.10 |publisher=PCjs Machines |access-date=February 8, 2023}}</ref>
|-
| 3.2 (3.20) || April 2, 1986 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS286-129 |type=Announcement letter |id=286-129 |title=IBM Personal Computer Disk Operating System Version 3.2 On 3.5-Inch Diskette And IBM Personal Computer BASIC Reference Version 3.2 Available |publisher=[[IBM]] |date=April 2, 1986 |access-date=January 19, 2025}}</ref>
|-
| 3.3 (3.30) || April 2, 1987 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS287-098 |type=Announcement letter |id=287-098 |title=IBM Disk Operating System (DOS) Version 3.30 |publisher=[[IBM]] |date=April 2, 1987 |access-date=January 19, 2025}}</ref>
|-
| 4.0 || July 19, 1988 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS288-380 |type=Announcement letter |id=288-380 |title=IBM Disk Operating System (DOS) Version 4.00 |publisher=[[IBM]] |date=July 19, 1988 |access-date=January 19, 2025}}</ref>
|-
| 5.0 || June 11, 1991 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUSZP91-0432 |type=Announcement letter |id=ZP91-0432 |title=IBM DOS Version 5.00 and Upgrade |publisher=[[IBM]] |date=June 11, 1991 |access-date=January 19, 2025}}</ref>
|-
| 6.1 || July 26, 1993 || <ref name="version-6.1">{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS293-347 |type=Announcement letter |id=293-347 |title=IBM PC DOS Version 6.1 |publisher=[[IBM]] |date=June 29, 1993 |access-date=January 19, 2025}}</ref>
|-
| 6.3 || April 27, 1994 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS294-263 |type=Announcement letter |id=294-263 |title=IBM PC DOS Version 6.3 |publisher=[[IBM]] |date=April 27, 1994 |access-date=January 19, 2025}}</ref>
|-
| 7.0 || February 28, 1995 || <ref name="version-7">{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUSZP95-0102 |type=Announcement letter |id=ZP95-0102 |title=IBM PC DOS Version 7 |date=February 28, 1995 |access-date=January 19, 2025}}</ref>
|-
| 2000 || May 29, 1998 || <ref>{{cite web |url=https://www.ibm.com/docs/en/announcements/archive/ENUS298-169 |type=Announcement letter |id=298-169 |publisher=[[IBM]] |title=IBM PC DOS 2000 Can Ease Your Transition to the Year 2000 |date=May 26, 1998 |access-date=January 19, 2025}}</ref>
|}