UNIX

Unix
Type:	Time-sharing
Creator:	Ken Thompson, Dennis Ritchie and Douglas McIlroy at Bell Labs
Multitasking:	Multitasking with paging/swap
Architecture:	Originally PDP-7, then PDP-11 now cross-platform.
Date Released:	1969

Unix (officially trademarked as UNIX®) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy. Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations.

Versions of relevance for hobbyists include:

• Unix System 1 - The first version of UNIX that has been recently made to run on the PDP-11
• Unix System 5 - One of first version with known source and binaries available.
• Unix System 6
• Unix System 7 - One of the most complete and the last generally available and PDP-11 version of Research UNIX
• 2.11 BSD - A still-maintained version for PDP-11s
• 4.2 BSD - The first shipping version of BSD with TCP/IP, FFS & termcap for the VAX.
• 4.3 BSD - A version of pre-POSIX BSD, for the VAX.
• 4.4 BSD
• Net/1
• Net/2

386 BSD This is the first Net/2 derived OS that then spawned the Net/FreeBSD os's.

FreeBSD focuses on providing a system geared towards a single user.

NetBSD will run on a variety of 32-bit older systems from the VAX to the Amiga.

OpenBSD derived from the NetBSD project will run on all kinds of systems.