history - What were the differences between Xenix and Unix ...
Feb 25, 2021 · Xenix developed from being a System 7 over System III to System V related. Unlike often assumed, Unix does not need a fully fledged MMU, it only simplifies life. In fact, SCO's twist on Xenix was the low end market. Their Xenix 3.0 (System III alike at that time) was intended for IBM-PC (MS-Xenix did of course use 286 protected mode).
What's the relationship betweeen MS-DOS and XENIX?
XENIX used a forward slash as a separator, but versions 1.x of MS-DOS, borrowing from the tradition of DEC operating systems, already used the forward slash for switches in the command line, so Microsoft, at IBM's request, decided to use the backslash as the separator instead.
Why did so many OS names end in "x?"
Jan 31, 2025 · 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.
How POSIX-compliant is Xenix? - Retrocomputing Stack Exchange
Device drivers for Xenix more or less follow the model of V7/SysIII respectively SysV with various quirks and extensions. There are some subtle differences between different versions of Xenix. It is fairly easy to port drivers from e.g. another SysV Unix (or a different version of Xenix), but not without reading the Xenix Device Driver Guide first.
history - What were the Major Public Access Unix Systems …
07/22 213-376-5714 pnet02 Redondo Bch CA 3/12/24 24 XENIX (also 213-374-7404) no fee, 90 min limit, login: pnet id: new some USENET, net-work e-mail, multi-threaded conferencing DOWN 213-459-7231 stb Sta Monica CA 3/12/24 24 Tandy 16 no limits, no fee, Serial Tree bbs (home made), shell access 10/31 305-584-4440 pinn Ft. Laud. FL 3/12/24 24 IBM ...
What should be put to the first 128 bytes of the code segment in …
Jan 23, 2023 · I'm writing a hello-world program for Xenix 86 in NASM. See the full source code. If I only put this to the code segment, then it fails with segfault (Memory fault) on Xenix 286: mov ax, 4...
What was the first Unix version to run on a microcomputer?
Mar 29, 2019 · This was followed shortly by Xenix, Microsoft’s licensed port of Unix, which first shipped in January 1981 on a Z8001-based Central Data Corporation system (not to be confused with the more famous Control Data Corporation). 8086 systems running Xenix started shipping in …
Why was the DOS kernel discarded? - Retrocomputing Stack …
Nov 17, 2022 · History tells us that Xenix never replaced DOS, and by the end of 80s Microsoft had abandoned it (see What were the differences between Xenix and Unix?). By this time, Microsoft had embarked on two new operating systems: MS-DOS 4.0 and OS/2. Multi-tasking MS-DOS. There was one attempt to extended MS-DOS to produce a more capable operating …
What is the simplest UNIX system with a MMU?
Dec 29, 2021 · A good example for what a low end (non educational/research) system might be is Microsoft's XENIX. It's not an Unix-alike, but a fully licensed (*1) AT&T Unix. First based on genuine V7 sources, later upgraded to System III and System V. Microsoft sold it mostly to OEMs like Altos, Siemens or Tandy. A basic starter system may look like these:
Row locking on RM/COBOL-85 - Retrocomputing Stack Exchange
Oct 19, 2022 · The database where just one ISAM and one index file per table, all stored in a network share, mapped in the client computers as a networked drive (except in Xenix, but this is another history). There where no "database server", the client applications open directly the .DAT (ISAM file) and .IDX (index file) to read and store the data.