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  • history - What were the differences between Xenix and Unix . . .
    Put another way, even if the reasoning behind the segmentation isn’t consistent compared to previous Xenix releases, there are technical differences between Xenix and SCO UNIX, which is what the question is about
  • Whats the relationship betweeen MS-DOS and XENIX?
    11 The major relationship between MS-DOS and Xenix is that both were Microsoft products MS-DOS was originally 86-DOS, from Seattle Computer Products, and was licensed by MS to develop PC-DOS Xenix was a version of Unix which Microsoft licensed from Bell Labs (which was legally prohibited from selling software to consumers) and re-sold
  • How POSIX-compliant is Xenix? - Retrocomputing Stack Exchange
    Xenix was the most popular Unix flavour of the 80's However, it was designed before the POSIX standards came to be, and its final version was released shortly after the first POSIX specification was
  • Why did so many OS names end in x?
    Xenix is a Unix distribution AIX, HP-UX and IRIX are Unix-derived operating systems Minix and Linux are indepently developed operating systems with the express goal of being compatible with Unix POSIX is an API specification for Unixoid operating systems In each case, the "x" is there to show that connection
  • Why was the DOS kernel discarded? - Retrocomputing Stack Exchange
    Microsoft’s other early operating system: Xenix At the time DOS was released, Microsoft already had another operating system, also bought in — Xenix, a licensed version of Unix
  • history - What were the Major Public Access Unix Systems Available in . . .
    There's actually pretty good information on the state of public access Unix systems in 80's and 90's in the form the "nixpub" list that was distributed on Usenet and other places The earliest version I could find is from November 1987 and listed 35 sites: 11 22 206-863-0453 * Sumner WA 12 24 Tandy 6000 - XENIX * Micro Magic BBS Fee $30 yr $5 setup shell access multiple lines 863-0454 5 6 11
  • What was the first Unix version to run on a microcomputer?
    35 In 1981, Microsoft released Xenix which could run on the x86, the 68000, and others As you know, Microsoft targets microcomputers above other markets; that was especially true in the 80s So this was perhaps the first unix, or at least among the first commercial unices, to be intended to run on high-end micros
  • Operating systems running programs in 286 16-bit protected mode
    As far as I know, Unix systems other than Xenix in the 1980s, before they gained support for 386 and 32-bit protected mode, ran 16-bit programs (and also the operating system) in real mode rather than 16-bit protected mode
  • Which operating systems for 80286 computers allowed a process to use . . .
    The process is detailed in section 9 2 2 of Gordon Letwin’s Inside OS 2 Xenix 286 also supported multiple text and data segments; processes with multiple segments were called “large model processes” (the same terminology as was used with C compilers under DOS) See Overview of the Xenix 286 Operating System
  • What should be put to the first 128 bytes of the code segment in Xenix 86?
    I suspect that the reason for this behavior is that after Xenix 86 or 286 loads the program, it changes the first 0x80 bytes of the code, so the int 5 is actually some other instruction What exactly is the behavior of the first 0x80 code bytes on Xenix 86, and where is it documented?





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