UNICS                      1969 developed at Bell Labs in the Summer 1969 - Fall 1970
                           (for PDP-7)
(UNiplexed Information and Computing Service)
Unix V1 Bell Labs          1971 (for PDP-11/20)
Unix V2 Bell Labs          1972
Unix V3 Bell Labs      Feb 1973
Unix V5 Bell Labs     June 1974 (for PDP-11/40)
Unix V6 Bell Labs          1975
BSD 1.0              March 1978 (add-on to Unix V6)
Unix v6 port to Interdata  1978
Unix V7 Bell Labs          1979 (for PDP-11/45)
32V                        1979 V7 ported to Vax 11/780
BSD 2.0                May 1979 (add-on to v7, vi and cshell first appears)
Unix/32V              June 1979 (port of V7 to Vax)
BSD 3.0		           1979 (like 32V but with better virtual memory, ported to Vax)
Xenix                      1980 (originally derived from v7)
Unix V7M DEC               1981
4.1BSD                June 1981
UTS                        1981
4.2BSD                     1982 (tcp/ip is added)
Unix System III            1982
2.9BSD                     1983 (PDP-11 only)
Unix System V          Jan 1983
Ultrix x-11 v2.16          1984
Venix 2.0                  1984
Unix System V rel 2    Apr 1984
UWM first appears          1985
Ultrix V6	       Jan 1985
Unix V8 Bell Labs          1985 /proc is introduced, blit graphics terminal
                                based on 4.1cBSD 
UNICOS Cray                1985
Unix V9 Bell Labs          1986
4.3BSD                June 1986
Minix 1.0                  1987
Dell UNIX System V 1.x     1988
Apple A/UX                 1988
Unix System V R4           1988
4.3BSD-Tahoe          June 1988 (First version with X?)
Unix V10 Bell Labs         1989 (Last Unix from Bell)
SCO Unix 3.2.0             1990 (First SCO version with X and TCP/IP)
Ultrix 4.0	       May 1990
Net/2                      1990 (Networking Tape 2)
Minix 1.5                  1991
Solaris                    1991 Sun Microsystems, based on SVR4
Linux 0.01        Sept 17, 1991
2.11BSD                    1992 backport of 4.3BSD to the PDP-11
SLS (Softlanding Linux)May 1992
MCC Interim Linux      Nov 1992
Yggdrasil Linux   December 1992
BSD/386 1.0          March 1993
NetBSD 0.8           April 1993
Slackware 1.0     July 16, 1993
Debian 0.1          August 1993
FreeBSD 1.0       Nov   1, 1993
Darkstar Linux 0.99.14     1994
4.4BSD                June 1994
NetBSD 1.0         October 1994
Redhat 1.0        Nov   3, 1994
FreeBSD 2.0            Jan 1995
Ultrix V4.5       November 1995
OpenBSD 1.2	      July 1996
Minix 2.0                  1997
Linux Redhat 5.2       Nov 1998
Linux Redhat 6.1   October 1999 
Linux Redhat 7.2   October 2001
Linux Redhat 8.0  Sept 30, 2002
Fedora Core 1       Nov 6, 2003
Inferno 4th Edition        2004
Solaris 10                 2006 Sun mails out free DVDs
Basic Linux 3.5	       May 2007 (based on slackware 4.0)
FreeBSD 8         Nov  25, 2009
Illumos		           2010 fork of OpenSolaris
OpenBSD 4.7        May 19, 2010

Used:

Unix V5,V6,V7 (via simh)
2.11BSD (via simh)
4.3BSD (via simh)
Ultrix 4.0 (via simh)
Ultrix 4.5 (via gxemul)
Venix
Xenix 286 2.2.3
Xenix 386 2.3.4 (via qemu, last version)
FreeBSD 2.0
Linux Redhat 8
Linux FC1 2.4.22-1.2199
Vector Linux 2.6.27.29
Linux Fedora 10
Linux Fedora 14
Linux Fedora 16
OpenBSD 4.7
FreeBSD 8.1

Microsoft Licensed Unix source code from AT&T
Microsoft creates Xenix
Microsoft licenses Xenix to Intel, Tandy, Altos and SCO

Long ago, in Unix V6, there was a program /etc/glob that would expand wildcard
patterns

Xenix Notes
-----------

The PC/AT offered hardware memory protection, and
    SCO Xenix/286 took advantage of it.  SCO Xenix/386 added demand
    paged virtual memory.  These added features made multiuser PCs
    viable, and SCO Xenix popular.

BSD Notes
---------

BSD was originally an add-on to Unix v6
BSDs are direct derivatives of traditional Unix

Other Operating systems
-----------------------

KolibriOS