Updated MINIX and Unix directories

disks/pc/unix/ibm/xenix/1.0/README.md

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+---
+layout: page
+title: IBM PC XENIX 1.0
+permalink: /disks/pc/unix/ibm/xenix/1.0/
+---
+
+IBM PC XENIX 1.0
+---
+
+From [OS/2 Museum](http://www.os2museum.com/wp/ibm-pc-xenix/):
+
+> The IBM PC XENIX was based on AT&T’s UNIX System III (rather than the newer System V) with a number of BSD
+enhancements. The latter included vi, C shell, and termcap/curses. Microsoft also implemented several enhancements,
+such as the ability to read and write DOS file systems.
+
+> Much like other Xenix variants before and after, IBM PC XENIX was optionally shipped with Text Formatting System
+(TFS) and Software Development System (SDS) packages. The TFS was based on the classic nroff/troff formatters and
+associated utilities. The SDS included a compiler, assembler, debugger, and assorted development tools like SCCS and
+make.
+
+> One of the Microsoft-specific enhancements was the ability to cross-compile to DOS using the SDS. The XENIX to DOS
+cross-development capability was likely frequently used internally at Microsoft in the mid-1980s.
+
+> The IBM PC XENIX came with rudimentary networking capabilities, namely uucp and micnet, though little is known about
+their specifications.

disks/pc/unix/ibm/xenix/README.md

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+---
+layout: page
+title: XENIX Operating Systems from IBM
+permalink: /disks/pc/unix/ibm/xenix/
+---
+
+XENIX Operating Systems from IBM
+---
+
+Information is available for these versions of XENIX from IBM:
+
+* [IBM PC XENIX 1.0](1.0/)