Originally posted by adwb I'm sure my first digital had a generator driven by a steam traction engine so it was portable.
Actual fact: Early 'computers' were groups of humans, sometimes with mechanical numerating devices like adding machines or abacus's, sometimes with just pencil and paper. When Prof Petzval designed the first modern lens, only the military used 'advanced' math regularly (for calculating artillery ballistics), so the local Archduke loaned him a team of gunners to crunch the numbers. This is considered the first example of parallel computing. Actual truth -- see Wikipedia.
Thus we can conclude that early computer networks were beer-powered. (I can think of more recent systems shops that were/are driven by rather more illegal substances, but that's another story.)