A History of Information Technology and Systems Four basic periods Characterized by a principal technology used to solve the input, processing, output and communication problems of the time: Premechanical, Mechanical, Electromechanical, and Electronic A. The Premechanical Age: 3000 B.C. – 1450 A.D. Writing and Alphabets–communication. First humans communicated only through speaking and picture drawings. 3000 […]