This is the 25th anniversary of the IBM 5150. It was hardly the first personal computer -- insolent little startups such as Apple and Commodore had come first -- but IBM's entry into the P.C ...

That was in 1980. One year later, the IBM 5150 personal computer was selling out at stores such as Sears and ComputerLand for $1,565, not including a monitor.

UNITED STATES - DECEMBER 07: The IBM Personal Computer System was introduce in early 1981, at a ... More time when IBM was the world's largest mainframe computer manufacturer. Very early on in a ...