Silicon Valley's shrine to the computer has finally upgraded to version 2.0.

On Thursday, the 35-year-old Computer History Museum unveiled a $19 million overhaul, making this small city some 40 miles south of San Francisco a destination for anyone interested in the evolution from the abacus to the iPhone.

"We are living through the time of transition, from there being no computers anywhere to there being computers in everything that we touch," said Leonard J. Shustek, a venture capitalist and chairman of the museum's board. "We owe it to the future to preserve the artifacts and stories of how that happened."