The first "portable" computer fit in two trailer vans and weighed 20 tons

The first electromechanical computers occupied whole buildings, making them rather unwieldy; in the 1950s, an effort to create a "portable" computer called the DYSEAC bore fruit in the form of a computer on wheels that could be relocated, provided you had the trucking logistics to move two trailers with a combined weight of 20 tons. Read the rest