| 21. | The marketing positioned it as an additional option between DOS 3 . x for workstations, and Xenix for higher-end servers and multiuser systems.
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| 22. | SCO Xenix for the PC XT shipped sometime in 1984 and contained some enhancement from 4.2BSD; it also supported the Micnet local area networking.
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| 23. | Microsoft omitted multi-user support from MS-DOS because Microsoft's Unix-based operating system, Xenix, was fully multi-user.
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| 24. | Microsoft, in turn, did not sell Xenix directly to end users; instead, they licensed it to ported it to their own proprietary computer architectures.
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| 25. | This included processor boards like iSBC 86 / 12 and also MMU boards such as the iSBC 309 . The first Intel Xenix systems shipped in July 1982.
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| 26. | It agreed with IBM to develop OS / 2, and the Xenix team ( together with the best MS-DOS developers ) was assigned to that project.
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| 27. | In the meantime, AT & T and Sun Microsystems completed the merge of Xenix, BSD, SunOS and System V . 3 into System V Release 4.
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| 28. | During the following years, versions were developed for OS / 2, Xenix, SCO Unix and QNX . On QNX, Vedit was supplied as standard editor.
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| 29. | Only one DOS partition is allowed, the others are intended for other operating systems such as CP / M-86, UCSD p-System and Xenix.
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| 30. | At the same time, AT & T completed its merge of Xenix, BSD, SunOS, and UNIX System V Release 3 features into UNIX System V Release 4.
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