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Definition of Xenix (operating system)

(Microsoft Xenix).Xenix is ​​an old and obsolete UNIX-type operating system developed by Microsoft, which acquired it from AT&T.Finally, its rights were acquired by Santa Cruz Operation and launched under the name of SCO UNIX.

History of Xenix

Microsoft purchased a version 7 license of the Unix operating system from AT&T (the UNIX System V) in 1979, and named it Xenix.The company announced on August 25, 1980 that this system It would be available for 16-bit microcomputers, but it was not very successful.

Microsoft did not sell Xenix directly to end users, but instead licensed companies such as Intel, Tandy, Altos and SCO, who carried it as OEMs.to their respective computer architectures.For example, Xenix was only available for Intel 8086/8088 architecture when the Santa Cruz Operation (SCO) company ported it that way.

The original Microsoft Xenix was only running on PDP-11 computers, then behaved towards the pr 16-bit Zilog Z8001 processor.Meanwhile, Altos ported it for its Intel 8086 computers in early 1982.While Tandy ported it for its Motorola 68000-based systems under the name TRS-XENIX in early 1983; while SCO ported it to the IBM PC in September 1983.There was also a version for Apple Lisa based on 68000.

In 1985, version 2.0 of Xenix was released, based on UNIX System V.The upgrade to version 2.1.1 added support for Intel 80286 processors.The following releases improved compatibility with System V.

By 1986, the company SCO ported Xenix to the 386 32-bit processors.Version 2.3.1 introduced support for i386, SCSI and TCP/IP processors.

The SCO Xenix System 5/386 system was the first 32-bit operating system available on the market for architectural computers x86.SCO renamed Xenix under the name of SCO UNIX in 1989.Its market price was 1200 US dollars and it came in a large box with 40 floppy disks of 5.25 inches.It would require a minimum of 1 MB of RAM.

Meanwhile, AT&T and Sun Microsystems merged the Xenix, BSD, SunOS and System V systems into System V Release 4.

By the end of the 80s, it was probably the most extended UNIX version of the moment, according to the number of machines that were running it (according to The Design and Implementation of the 4.3BSD UNIX Operating System).

Microsoft lost interest in developing the Xenix system when it reached an agreement with IBM to develop the OS/2 system; Xenix transferred to SCO and the agreement kept 25% of the company.

Microsoft continued to use Xenix internally at Sun workstations and VAX minicomputers until the end of 1992.I continued using Xenix 68000 until 1993 for the transport of your internal e-mails.

The latest version of Xenix was the 2.3.4 released in 1989.

External links: • Images of Xenix and related products • Downloads by Xenix Tandy

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