Characteristics Four Generations of Computer Points : explain what electronic technology characteristics each of the four generations of computer contained Vacuum Tubes: (1st Generation of Computer) Vacuum tubes are used as internal component in first generation. Lot of heat d by vacuum tubes. Size of computer was very larger. Solid State Circuit: (2nd Generation of Computer) Solid state circuit (transistor) was used as internal (transistor) component of computer in second generation. Size of computer becomes small, due to transistors main memory was increased. Integrated Circuit: (3rd Generation of Computer) Integrated circuit was Introduced in third generation. An integrated circuit s many electronic components on a single chip. High level language was used. Large Scale Integrated Circuits: (4th Generation of Computer) Very large scale integrated circuit and micro processors were used as internal computer components in the fourth generation.