A: It is generally accepted that San Jose is the original Silicon Valley, but the boundaries shifted during the big techie boom, and pretty much include all of the San Francisco/Central-West California area. — IxnayOnTheTimmay [add comment]

A: the core of it-development was there, end of the nineties, in california — O. van der Zee [add comment]

A: Silicon Valley is an area that "located on the San Francisco, California, peninsula, radiates outward from Stanford University. It is contained by the San Francisco Bay on the east, the Santa Cruz Mountains on the west, and the Coast Range to the southeast. At the turn of the century, when fruit orchards predominated, the area was known as the Valley of Heart's Delight " — Iana [add comment]

A: still don't — gaugefield [add comment]