Speech recognition wasn't a new prospect when Siri was revealed by Apple last year. But with the rapid proliferation of the iPhone 4S, its easy to forget about all the past attempts to bring talking computers into our lives.

Take a look back at some of the devices put to market in this video, as well as some lovely mustache'd fellows from the 80's and 90's. The clips come from the PBS show Computer Chronicles, which aired in the US from 1984-2002.