1965-1975 Third generation is characterized by the emergence of integrated circuits made based on silicon, increasing the speed, the greater number of programs and languages: Cobol, Fortran and the emergence of the terminals to transmit data to the central processor to distance, or vice versa. Appear for the control of computer operating systems, central data stores that can be accessed from multiple users at the same time. The first appliance-based fully integrated circuits is the IBM series 360 which incorporated in addition an operating system for the control of the machine. In the mid-1970s appear the first minicomputers. Fourth generation 1975-1990 the most important characteristic of this generation is the emergence of Chip microprocessors, which are large amount of transistors integrated circuits in a small space. Other features are the increase of input and output of data capacity, longer duration of components, new languages of Logo programming, Pascal, Basic, databases. Intelligent terminals with own memory and word processors emerge.
It reduces the size and cost of computers and improves the speed of calculation. A new era opens with the emergence of the personal computers or Personal Computer. The early microcomputers had a price higher than the two billion pesetas. At the end of the 1980s, the price was about two hundred thousand pesetas and its performance was 100 times greater. This time emphasizes the development of operating systems, seeking an integration between the user and the computer, through the use of graphics. Fifth generation 1990-today the revolution arrives with new generation microprocessors.
Speed fires and they occur the successive generations of microprocessors, the personal computer is generalized. Alliances between rival companies are the tonic of this era, IBM signed agreements with Apple and Motorola, for the production of a new series of microprocessor called PowerPC. Intel releases the Pentium as a response to this Alliance microprocessor. As the years advance speed and the performance of microprocessors is higher thanks to advances in microelectronics. It should be noted that on the other hand other companies continue to work on supercomputers that incorporate several microprocessors on the same machine. According to Moore’s law, the number of transistors per microprocessor doubles every 18 months. He has met in the past 30 years and is expected to meet during the next 20 years.