Xenix: Difference between revisions

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The later 286 version of Xenix used the integrated MMU present on this chip, by running in [[Protected mode#The 286|286 protected mode]].<ref>[http://www.tenox.net/docs/microsoft_xenix_30_286_press_release.pdf Microsoft Xenix 3.0 ready for 286] {{webarchive |url=https://web.archive.org/web/20140107072346/http://www.tenox.net/docs/microsoft_xenix_30_286_press_release.pdf |date=January 7, 2014}}</ref> The 286 Xenix was accompanied by new hardware from Xenix OEMs. For example, the [[Sperry Corporation|Sperry]] PC/IT, an [[IBM Personal Computer/AT|IBM PC AT]] clone, was advertised as capable of supporting eight simultaneous [[dumb terminal]] users under this version.
 
While Xenix 2.0 was still based on Version 7 Unix,<ref>{{cite book |first=Ellie |last=Cutler |display-authors=etal |title=SCO Unix in a Nutshell |url=https://archive.org/details/scounixinnutshel00elli |url-access=registration |date=1994 |publisher=[[O'Reilly Media, Inc.]] |isbn=978-1-56592-037-8 |pages=[https://archive.org/details/scounixinnutshel00elli/page/312 312]–}}</ref> version 3.0 was upgraded to a [[Unix System III]] code base,<ref name="dir83"/>{{rp|9}}<ref name="Frisch2002">{{cite book |author-first=Æleen |author-last=Frisch |title=Essential System Administration: Tools and Techniques for Linux and Unix Administration |url=https://archive.org/details/essentialsystema00fris_0 |url-access=registration |date=2002 |publisher=[[O'Reilly Media, Inc.]] |isbn=978-0-596-55049-3 |page=xiii}}</ref><ref name="KentWilliams1990">{{cite book |author-first1=Allen |author-last1=Kent |author-link1=Allen Kent |author-first2=James G. |author-last2=Williams |title=Encyclopedia of Computer Science and Technology |volume=22 - Supplement 7 |chapter=Artificial Intelligence to Vector SPate Model in Information Retrieval |chapter-url=https://books.google.com/books?id=L7NOABDqaMcC&pg=PA404 |date=May 15, 1990 |publisher=[[CRC Press]] |isbn=978-0-8247-2272-2 |pages=404–}}</ref> a 1984 Intel manual for Xenix 286 noted that the Xenix kernel had about 10,000 lines at this time.<ref name="intel"/>{{rp|1–7}} It was followed by a [[Unix System V|System V R2]] codebase in Xenix 5.0 (a.k.a. Xenix System V).<ref name="Lapin1987">{{cite book |author-first=Juraj E. |author-last=Lapin |title=Portable C and Unix System Programming |date=1987 |publisher=[[Pearson Education]] |isbn=978-0-13-686494-3 |page=106 |quote=The Xenix 2.3 version generally resembles V7's [ABI]; the Xenix 3.0 version resembles SIII's, and the Xenix 5.0 version resembles SV2's.}}</ref>
 
"Microsoft hopes that Xenix will become the preferred choice for software production and exchange", the company stated in 1981.<ref name="greenberg198106">{{Cite magazine |author-last=Greenberg |author-first=Robert B. |date=June 1981 |title=The Unix Operating System and the Xenix Standard Operating Environment |url=https://archive.org/stream/byte-magazine-1981-06/1981_06_BYTE_06-06_Operating_Systems#page/n249/mode/2up |magazine=[[Byte (magazine)|Byte]] |pages=248–264}}</ref> Microsoft referred to its own [[MS-DOS]] as its "single-user, single-tasking operating system",<ref name="byte198207">{{cite news |url=https://archive.org/stream/byte-magazine-1982-07/1982_07_BYTE_07-07_Computers_in_the_Arts_and_Sciences#page/n321/mode/2up |title=Upward Migration / Part 2: A Comparison of CP/M-86 and MS-DOS |newspaper=[[BYTE]] |date=July 1982 |access-date=23 March 2016 |author-last1=Taylor |author-first1=Roger |author-last2=Lemmons |author-first2=Phil |pages=330}}</ref> and advised customers that wanted [[multiuser]] or [[Computer multitasking|multitasking]] support to buy Xenix.<ref name="byte198207"/><ref name="swaine19820823">{{cite news |url=https://books.google.com/books?id=VDAEAAAAMBAJ&pg=PA24 |title=MS-DOS: examining IBM PC's disk-operating system |newspaper=[[InfoWorld]] |date=August 23, 1982 |access-date=January 29, 2015 |author-last=Swaine |author-first=Michael |author-link=Michael Swaine (technical author) |pages=24}}</ref> It planned to over time improve MS-DOS so it would be almost indistinguishable from single-user Xenix, or '''XEDOS''', which would also run on the 68000, Z8000, and LSI-11; they would be [[upward compatible|upwardly compatible]] with Xenix, which ''[[Byte (magazine)|Byte]]'' in 1983 described as "the multi-user MS-DOS of the future".<ref name="morgan198201">{{cite news |url=https://archive.org/stream/byte-magazine-1982-01/1982_01_BYTE_07-01_The_IBM_Personal_Computer#page/n7/mode/2up |title=Of IBM, Operating Systems, and Rosetta Stones |newspaper=[[Byte (magazine)|Byte]] |date=January 1982 |access-date=October 19, 2013 |author-last=Morgan |author-first=Chris |page=6}}</ref><ref name="fiedler198310">{{cite news |url=https://archive.org/stream/byte-magazine-1983-10/1983_10_BYTE_08-10_UNIX#page/n133/mode/2up |title=The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace |newspaper=[[BYTE]] |date=October 1983 |access-date=January 30, 2015 |author-last=Fiedler |author-first=Ryan |pages=132}}</ref> Microsoft's Chris Larson described MS-DOS 2.0's Xenix compatibility as "the second most important feature".<ref name="larson198311">{{cite news |url=https://archive.org/stream/byte-magazine-1983-11/1983_11_BYTE_08-11_Inside_the_IBM_PC#page/n291/mode/2up |title=MS-DOS 2.0: An Enhanced 16-Bit Operating System |newspaper=[[BYTE]] |date=November 1983 |access-date=19 March 2016 |author-last=Larson |author-first=Chris |pages=285}}</ref> His company advertised DOS and Xenix together, describing MS-DOS 2.0 (its "single-user OS") as sharing features and [[system call]]s with Xenix ("the multi-user, multi-tasking, Unix-derived operating system"), and promising easy porting between them.<ref name="iw19830627">{{cite news |url=https://books.google.com/books?id=yy8EAAAAMBAJ&pg=PA44 |title=Before you bet your business software on an OS, look who's betting on MS-DOS and Xenix. |newspaper=[[InfoWorld]] |date= June 27, 1983 |access-date= January 31, 2015 |pages=44 |type=advertisement}}</ref>