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Encyclopedia > XENIX
Xenix

Xenix under Bochs
Company/
developer:		 Microsoft
OS family: Unix
Source model: Closed source
Latest stable release: 2.3.4 / 1989
Kernel type: Monolithic kernel
Working state: Historic

Xenix was a version of the Unix operating system, licensed by Microsoft from AT&T in the late 1970s. The Santa Cruz Operation (SCO) later acquired exclusive rights to the software, and eventually began distributing it as SCO UNIX. Image File history File links Xenix_Screensnap. ... The term software company could be applied to; a) a company that produces software or b) a company that distributes software from a third party or c) a company that provides services for software. ... A software developer is a programmer who is concerned with one or more facets of the software development process, a somewhat broader scope of computer programming. ... This article is becoming very long. ... Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... The text below is generated by a template, which has been proposed for deletion. ... 1989 (MCMLXXXIX) was a common year starting on Sunday of the Gregorian calendar. ... A kernel connects the software and hardware of a computer. ... Graphical overview of a monolithic kernel A monolithic kernel defines a high-level virtual interface over the hardware, with a set of primitives or system calls to implement operating system services such as process management, concurrency, and memory management in several modules that run in supervisor mode. ... Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... This article is becoming very long. ... AT&T Inc. ... The 1970s decade refers to the years from 1970 to 1979, inclusive. ... Tarantella, Inc. ... Tarantella, Inc. ...


==History==g

4.3BSD UNIX
Enlarge
4.3BSD UNIX

Operating System Image File history File links Ms_xenix. ... Image File history File links Ms_xenix. ...


|year= 1989g |publisher= Addison-Wesley |id= ISBN 0-201-061961g |pages= page 7gg Pearson can mean Pearson PLC the media conglomerate. ...

Contents

Trusted Xenix

Trusted Xenix was a variant developed by Trusted Information Systems which incorporated the Bell-LaPadula model of multilevel security, and had a multilevel secure interface for the STU-III secure communications device (that is, an STU-III connection would only be made available to applications running at the same privilege level as the key loaded in the STU-III). It was evaluated by formal methods and achieved a B2 security rating under the NSA's Trusted Computer System Evaluation Criteria—the second highest rating ever achieved by an evaluated operating system. Version 2.0 was released in January 1991, version 3.0 in April 1992, and version 4.0 in September 1993. It was still in use at least as of 1995. Trusted Information Systems (TIS) was a computer security research and development organization during the 1980s and 1990s, performing computer security research for organizations such as NSA, DARPA, ARL, AFRL, SPAWAR, and others. ... The Bell-LaPadula Model was developed by David Bell and Len LaPadula in 1973 to formalize the U.S. Department of Defense multi-level security policy. ... A STU-III secure telephone; this model AT&T STU-III is a family of secure telephones introduced in 1987 by the NSA for use by the United States government, its contractors, and its allies . ... In computer science, formal methods refers to mathematically based techniques for the specification, development and verification of software and hardware systems. ... The National Security Agency/Central Security Service (NSA/CSS) is the United Statess cryptologic organization. ... The Orange Book Trusted Computer System Evaluation Criteria (TCSEC) is a United States Government Department of Defense (DoD) standard that sets basic requirements for assessing the effectiveness of computer security controls built into a computer system. ...


References

  1. ^ Terry Lambertg. "Re: Microsoft Source (fwd)gg". sol.lists.freebsd.chdf_usr08.primenet.com@nsg.sol.net. (Google Groups).

See also

The SCO Group, Inc. ... SINIX (later renamed to Reliant UNIX) was a version of the Unix operating system from Siemens Nixdorf Informationssysteme. ...

External links

v • d • e
Unix-like operating systems

A/UX • AIX • BSD • FreeBSD • GNU • HP-UX • IRIX • Linux • Mac OS X • NetBSD • NEXTSTEP • OpenBSD • Plan 9 • QNX • Research Unix • SCO OpenServer • Solaris • System V • Tru64 • Xenix • more ... A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A/UX (from Apple Unix) is Apple Computers implementation of the Unix operating system for some of their Macintosh computers. ... AIX (Advanced Interactive eXecutive) is a proprietary operating system developed by IBM based on UNIX System V. Before the product was ever marketed, the acronym AIX originally stood for Advanced IBM UNIX. The scalable AIX 5L 5. ... Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the Unix derivative distributed by the University of California, Berkeley, starting in the 1970s. ... FreeBSD is a Unix-like free operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD) branch through the 386BSD and 4. ... GNU (pronounced ) is a free operating system consisting of a kernel, libraries, system utilities, compilers, and end-user applications. ... HP-UX (Hewlett Packard UniX) is Hewlett-Packards proprietary implementation of the Unix operating system. ... IRIX is a System V-based Unix Operating System with BSD extensions developed by Silicon Graphics (SGI) to run natively on their 32- and 64-bit MIPS architecture workstations and servers. ... Linux (also known as GNU/Linux) is a Unix-like computer operating system. ... Mac OS X (official IPA pronunciation: ) is a line of proprietary, graphical operating systems developed, marketed, and sold by Apple Computer, the latest of which is pre-loaded on all currently shipping Macintosh computers. ... NetBSD is a freely redistributable, open source version of the Unix-like BSD computer operating system. ... NEXTSTEP is the original object-oriented, multitasking operating system that NeXT Computer, Inc. ... OpenBSD is a freely available Unix-like computer operating system descended from Berkeley Software Distribution (BSD), a Unix derivative developed at the University of California, Berkeley. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... QNX (pronounced either Q-N-X or Q-nix) is a commercial POSIX-compliant Unix-like real-time operating system, aimed primarily at the embedded systems market. ... Research Unix is a term commonly used to refer to versions of the Unix operating system for DEC PDP-7, PDP-9 PDP-11 and VAX and Interdata 7/32 and 8/32 computers, developed in the Bell Labs Computing Science Research Center. ... SCO OpenServer, previously SCO UNIX and SCO ODT, is a Unix-like computer operating system developed by Santa Cruz Operation (SCO) and now maintained by the SCO Group. ... Solaris is a computer operating system developed by Sun Microsystems. ... It has been suggested that Traditional Unix be merged into this article or section. ... Tru64 UNIX is HPs (formerly Compaq; formerly DEC) 64-bit Unix operating system for the DEC Alpha AXP platform. ...


  Results from FactBites:
 
Xenix (276 words)
Xenix was not sold directly to end users, rather than Microsoft licensing it to computer manufacturers who would then port it to their systems.
Xenix varied from its System 7 origins by incoporating elements from BSD, and soon possessed the most widely installed base of any UNIX flavor due to the popularity of the inexpensive x86 processor, although the port created for Tandy computers proved to be more robust.
Microsoft is said to have used Xenix on VAX minicomputers extensively within their company as late as 1992.
Xenix: Information from Answers.com (681 words)
Xenix was Microsoft's version of Unix intended for use on microcomputers; since Microsoft was not able to license the "UNIX" name itself, they gave it an original name ending in -ix, a convention followed by many other Unix-like operating systems.
Xenix varied from its 7th Edition origins by incorporating elements from BSD, and soon possessed the most widely installed base of any Unix flavour due to the popularity of the inexpensive x86 processor, even though the port created for Tandy Corporation computers proved to be more robust.
Microsoft is said to have used Xenix on Sun workstations [1] and VAX minicomputers extensively within their company as late as 1992.
  More results at FactBites »


 

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