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3DA was an alliance formed between The Santa Cruz Operation (SCO) and Hewlett Packard (HP) in September 1995.[1] Its purpose was to unify SCO's OpenServer product, UnixWare (newly acquired from Novell), and HP-UX from HP; the resulting product would then become the de facto Unix standard for both existing x86 systems and the upcoming IA-64 processor architecture from Intel.

In September 1996, SCO announced that they were offering a "code-level preview" of the system, codenamed Gemini.[2]

By 1998 the alliance had ground to a halt, setting the stage for Project Monterey.[3]


  1. ^ "HP, Novell and SCO To Deliver High-Volume UNIX OS With Advanced Network And Enterprise Services" (Press release). Hewlett Packard Company; Novell; SCO. September 20, 1995. Archived from the original on 23 January 2007. Retrieved 2007-01-23. 
  2. ^ Atanu Roy (1996-09-24). "SCO Previews Gemini, The SCO-HP 64-bit Unix". Newsbytes. Retrieved 2011-03-20. 
  3. ^ "SCO Admits Past Mistakes, Seeks Glory In Merced". Computergram International. 1998-03-16. Retrieved 2007-01-23. Santa Cruz Operation Inc SVP marketing Ray Anderson's frank about mistakes the company made since it acquired Unix from Novell Inc - including the corpse of the grand 3DA Unix alliance with Hewlett-Packard Co ... 
  • "UNIXWARE TECHNOLOGY GROUP INC. (UTG) CHANGES NAME" (Press release). UTG, Inc. March 27, 1996. Retrieved 2007-01-23. ...announcing [...] new marketing and technical programs aimed at supporting the joint UNIX System development initiatives announced by the Santa Cruz Operation (SCO) and Hewlett-Packard Company (HP) in September 1995. 
  • "New Unix is no two-bit act". CNET News.com. 1997-01-08. Retrieved 2007-01-23. The new OS will combine SCO's OpenServer and UnixWare operating systems with HP's HP-UX OS platform.