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David Bradley, an original member of the IBM PC team and the inventer of the control-alt-delete function, sits in front of one of the original PC computers and holds up a copy of the DOS software it used Friday, July 27, 2001, at the IBM office in Durham, N.C. IBM faced a problem in late 1979. Personal computers, once only the gadgets of hobbyists, were increasingly finding a place inside homes. Rather than forfeit the game to early players such as Apple Computer, Commodore and Radio Shack, IBM decided it was time for Big Blue to take a big jump. Twenty years ago, on August 12, 1981, International Business Machines Corp. unveiled the result: the IBM 5150 Personal Computer. (KEYSTONE/AP Photo/Bob Jordan)