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vanished DEC Ultrix was actually based on Berkeley Unix (BSD), and therefore only indirectly on AT&T Unix. (Does anyone really care?

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vanished DEC Ultrix was actually based on Berkeley Unix (BSD), and therefore only indirectly on AT&T Unix. (Does anyone really care?

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[9] Xenix was a very limited and much-derided Unix variant for 80286 (AT-class) machines, written by a team at Microsoft, whose division immediately split off as Santa Cruz Operation (SCO), taking the product (such as it was) with them in exchange for giving Microsoft (if memory serves) 40% of their stock — a kind of reverse acquisition. I hadn’t forgotten this history in writing my essay; it’s just one of many fine details that I saw no need to get into. (That “SCO” company, based in Santa Cruz, California, which eventually renamed itself to Tarantella, sold off its unwanted OS business division, and was merged into Sun Microsystems, should not be confused with the more recent SCO Group of Lindon, Utah. The latter company, which had started life as Linux firm Caldera Systems, Inc., in 2001 purchased the “SCO” name and related unwanted OS division, exited the Linux business, and since then has attempted rather poorly to be a proprietary Unix company, but has become better known for it

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