ac> Looking over WindRiver's web site, I can't even find VxWorks 5.3. I'm ac> guessing that it was released sometime in the '90s? Some superficial googling for "vxworks 5.3 release" turns up: http://www.omimo.be/magazine/99q4/rtc.pdf This is a magazine review of 5.3.1 from 1999 q4. Michael C