Abacus is cnsidered as the first known counting device and it was orginated from Asia. Abacus worked on a place-value notion meaning that the place of a bead or rock on the apparatus determined how much it was worth.
In 1642 a French mathematician and philosopher Blaise Pascal invented the first mechanical digital calculator using gears known as the Pascaline.
In 1812 Charles P. Babbage later known as the “father of the computer”,designed a machine, the difference engine which was steam-powered, fully automatic and commanded by a fixed instruction program.
In 1947 the giant calculating device ENIAC (Electrical Numerical Integrator and Calculator) machine was developped by John W. Mauchly and J. Presper Eckert, Jr. at the University of Pennsylvania.
In early 1960s Gene Amdahl designed the IBM System/360 series of mainframe computers, which considered as the first general purpose digital computers which uses intergrated circuits.
In 1961 Dr. Hopper developed the COBOL (Common Business Oriented Language) programming language.
In 1964 the International Business Machines (IBM) publishes and marketed the term “word processor
In 1965 Dr. Thomas Kurtz and Dr. John Kemeny developped BASIC (Beginners All-purpose Symbolic Instruction Code) programming language .
In 1969 the Internet was started.
In 1969, computers were first used to communicate synchronously.
In 1970 Dr. Ted Hoff developed the famous Intel 4004 microprocessor (G) chip.
In 1971 the Intel released the first microprocessor, a specialized integrated circuit which was able to process four bits of data at a time.
In 1976 Apple Computers was founded by Steven Jobs and Stephen Wozniak.
In 1981 the IBM PC was introduced with a 16-bit microprocessor.