Interactive Systems Corporation

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Interactive Systems Corporation (styled INTERACTIVE Systems Corporation, abbreviated ISC) was a US-based software company and the first vendor of the Unix operating system outside AT&T, operating from Santa Monica, CA. It was founded in 1977 by Peter G. Weiner, a RAND Corporation researcher who had previously founded the Yale University computer science department.[1]

PC/IX for the IBM PC

ISC's 1977 offering, IS/1, was a Version 6 Unix variant enhanced for office automation for the PDP-11. IS/3 and IS/5 were enhanced versions of Unix System III and System V for PDP-11 and VAX. ISC Unix ports to the IBM PC included a variant of System III, developed under contract to IBM, known as PC/IX (Personal Computer Interactive eXecutive), with later versions branded 386/ix and finally Interactive Unix System V/386 (based on System V Release 3.2). ISC was AT&T's "Principal Publisher" for System V.4 on the Intel platform.[2]

ISC was also involved in the development of VM/IX (Unix as a guest OS in VM/CMS), IX/360 (native Unix on the System/360) and AIX, again under contract to IBM. Several former ISC staff founded Segue Software which partnered with Lotus Development to develop the Unix version of Lotus 1-2-3 and with Peter Norton Computing to develop the Unix version of the Norton Utilities.

ISC was acquired by Eastman Kodak Company in 1988, [3] which sold its ISC Unix operating system assets to Sun Microsystems on September 26, 1991.[4] Kodak sold the remaining parts of ISC to SHL Systemhouse Inc in 1993.[5] Final support for Interactive System V/386 from Sun ended on July 23, 2006.


  1. ^ Ware, Willis H. (2008), Rand and the Information Evolution: A History in Essays and Vignettes, RAND Corporation, p. 123, ISBN 978-0-8330-4513-3 
  2. ^ "INTERACTIVE Systems Corp. of Reston, Va., has inked a distribution agreement with Government Micro Resources". Software Industry Report. 1991-03-18. Retrieved 2006-04-12. [dead link]
  3. ^ Sten A. O. Thore. The diversity, complexity, and evolution of high tech capitalism. Kluwer Academic Publishers. p. 78. ISBN 9780792396390. 
  4. ^ "SunSoft To Acquire INTERACTIVE Intel-Software Division Of Kodak, SunFLASH Vol 33 #26". Sun Microsystems. 1991-09-26. Retrieved 2006-04-12. 
  5. ^ "Kodak sells Interactive to US subsidiary of Canada's SHL Systemhouse.". Retrieved 2008-09-30 Dead link 2013-09-16.