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Developer Sequent Computer Systems
OS family Unix-like (BSD)
Working state Discontinued
Initial release 1984
Succeeded by DYNIX/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]


  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".