UNIX AND ITS DERIVATIVES

This section lists variants of the UNIX operating system, including the standard versions from AT&T and The University of California at Berkeley, and various commercial implementations that bear different names but are substantially similar. Fully identical implementations are not listed. Systems that are based on UNIX but include substantial differences, such as distributed processing, real-time facilities, or simplified versions for microcomputers, are listed in other sections as appropriate.

Berkeley UNIX
Version of UNIX for VAX, developed at the University of California at Berkeley. Late 1970s through early 1990s. Latest version is 4.4.[Quarterman et al 1985].
BSD UNIX
Berkeley Standard Distribution. Official name for Berkeley UNIX.
COHERENT
Version of UNIX. Mark Williams Corp. Early 1980s.
CROMIX
UNIX System V port for Cromemco (68000 CPU). Cromemco Corp., Late 1970s.
DRM System
UNIX-Compatible system for 68000. NV Philips. [Mini-Micro 1985].
GENIX
UNIX version for the NSC 32016. National Semiconductor [Mini-Micro 1985].
GNU
A public domain OS under development by Richard Stallman and the Free Software Foundation. Expected to be fully compatible with UNIX. The name stands for "Gnu is Not UNIX."
IDRIS
Version of UNIX. 68000, 8086, PDP-11, VAX. Whitesmiths, Ltd. Late 1970s [Plauger & Krieger 1980].
INOS
UNIX lookalike for the Artisan DP-09 (6809 CPU). Based partly on Uniflex. Introl Corp., Mid 1980s.
IS/3
Version of UNIX (System 3) for PDP-11 and VAX. Interactive Systems [Digital 1984].
Linux
ONIX
Version of UNIX. Onyx Corp.
OSF/1
OSx
Operating System for Pyramid Computers. Supports UNIX System V and BSD 4.2 concurrently. Early 1980s.
PC/IX
Version of UNIX for 8086. IBM. [Mini-Micro 1985].
PCUNIX
Small, inexpensive UNIX lookalike. Wendin Corp. Mid 1980s.
QNX
Unix lookalike for 80286 and others. Quantum Software Systems. Early 1980s (?).
REGULUS
Version of UNIX. Alcyon Corp. 68000 family.
RT/EMT
UNIX compatible OS for the PDP-11. Human Computing Resources.
SCO UNIX
SUNIX
Version of UNIX for Z8002. SGS-Ates. [Mini-Micro 1985].
System V
Standard version of UNIX licensed and distributed by AT&T. Early 1980s.
ULTRIX
Version of UNIX for DEC PDP-11 and VAX. Digital Equipment Corp. Early 1980's. [Digital 1984].
UniPlus
Version of UNIX for the 68000 family. Unisoft Systems Corp.
Uniq
Version of UNIX for PDP-11. Uniq Digital Technologies. [Digital 1984].
Unity
Version of UNIX for the DEC PDP-11 and VAX. Human Computing Resources. [Digital 1984].
UNIX
Widely used OS developed by Ken Thompson and Dennis Ritchie at Bell Laboratories around 1970. Based somewhat on MULTICS. Name probably derived from MULTICS, with "uni" signifying a single-user system. Many versions and imitators. Originally on DEC PDP-7 and PDP-11. Ported to VAX, M68000, and various other processors. Early 1970s [Ritchie & Thompson 1974, Thompson 1978, Bach 1986].
UNOS
UNIX-compatible real-time OS. Charles River Data Systems [Mini-Micro 1985].
VENIX
Version of UNIX (System V) for 8086 family, LSI-11. Venturcom [Mini-Micro 1985].
XENIX
Version of UNIX for various CPUs. Microsoft Corp.
ZEUS
Version of UNIX. Zilog Corp. Late 1970s [Zarella 1982].