1984-01-12   IBM PC-IX - See document

1990-02-15   IBM AIX version 3

1994-07-26   IBM AIX Version 4.1

1995-01-16   Turning the AIX Operating System into an MP-capable OS  [PDF]
1995-06-19   IBM AIX Version 4.1.3  More 

1996-04-23   IBM AIX Version 4.2

2000-11-16   AIX 5L Technical Preview  Brochure  [PDFs]

2001-04-23   IBM AIX 5L Version 5.1  Brochure  [PDF]  Enhancements  [PDF]
2001-04-23   SCO, Caldera Release Technology Preview of AIX 5L -- 64 Bit Unix OS