Many people may be surprised at when the first computer was invented. A computer, in its most basic form, is a tool to perform computations. So with this in mind, the first computer could be a a counting board or an abacus. However, since we commonly think of a computer as those things sitting on our laps or desktops, we'll go with that, more modern invocation. For more on the first computer
. invented, go here: http://inventors.about.com/library/blcoindex.htm