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DeveloperSequent Computer Systems
OS familyUnix-like (BSD or SysV)
Working stateDiscontinued
Initial release1984; 40 years ago (1984)
Available inEnglish
Succeeded byDYNIX/ptx

DYNIX (DYNamic UnIX) was a Unix-like operating system developed by Sequent Computer Systems, based on 4.2BSD and modified to run on Intel-based[1] symmetric multiprocessor hardware. The third major (Dynix 3.0) version was released May, 1987;[2] by 1992 DYNIX was succeeded by DYNIX/ptx,[3] which was based on UNIX System V.[4]

IBM obtained rights to DYNIX/ptx in 1999, when it acquired Sequent[5] for $810 million.[6]

IBM's subsequent Project Monterey was an attempt, circa 1999, "to unify AIX with Sequent's Dynix/ptx operating system and UnixWare." By 2001, however, "the explosion in popularity of Linux ... prompted IBM to quietly ditch" this.[7][8]

A version was named Dynix 4.1.4.[9]


  1. ^ "New Version of IBM DB2 Universal Database". May 17, 1999.
  2. ^ "Emerging Technologies Multi/Parallel Processing" (PDF).
  3. ^ DYNIX/ptx System Administration Guide, Volume 1 (1003-59809-00). Sequent Computer Systems, Inc.
  4. ^ "The system we investigated was a NUMA-Q 2000 System from IBM running a proprietary, System V based, operating system DYNIX/ptx."Mohamed Ibrahim; Josef Küng; Norman Revell (2000). Database and Expert Systems Applications: 11th International. ISBN 3540679782.
  5. ^ "SCO pulls second IBM Unix license". CNET.
  6. ^ "IBM drops Intel high-end server". Computerworld. May 13, 2002.
  7. ^ "Sequent "Project Monterey" Road Map". Computerworld. February 1, 1999. p. 28.
  8. ^ "Caldera loads Linux apps on UnixWare". ZDNet.
  9. ^ "Problems managing Sequent Dynix 4.1.4". Retrieved July 5, 2019.