July 12, 2006 — -- Twenty five years ago this week, Prince Charles and Princess Diana were on their honeymoon, the Space Shuttle had one flight … and -- oh, by the way -- the world was changing.

The IBM PC-AT was introduced in 1984. The "AT" stood for "advanced technology." The machine was the first upgrade from IBMs original PC architecture introduced in 1981 (the XT expanded storage options ...