Generation of Computers – Computers were developed in different phases known as generations of computer. Depending upon the technologies used the development of electronic computers can be divided into five generations. 1. First generation The duration lasted from 1946-1959 was based on vacuum tubes . Because thousands of such bulbs were used, the computers were very large and generate a large amount of heat, causing many problems in temperature regulation. Magnetic drums were used for memory purpose and instruction and data was given through punch cards . Computer were operated manually and instruction given in machine language . E.g. – UNIVAC (Universal automatic computer), ENIAC (Electronic Numerical Integrator And Calculator ) , Mark I etc. Main Features – 1. Vacuum tube technology used 2. ...