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500 BCE
Abacus
The abacus is a percussion instrument used to carry out simple1 arithmetic (addition, subtraction, division and multiplication) and more complex ones (such as calculating roots). It consists of a wooden box with parallel bars running movable balls, also useful for teaching these simple calculations. -
Pascaline
The pascaline was the first calculator that worked on wheels and gears, invented in 1642 by the French philosopher and mathematician Blaise Pascal (1623-1662). The first name he gave to his invention was 'arithmetic machine'. Then he called it "pascaline wheel", and finally "pascaline". This invention is the remote ancestor of today's computer. -
Tabulate
In 1890, Herman Hollerith (1860-1929) had developed an electric punch card system based on Boolean logic, applying it to a tabulating machine of his invention. Hollerith's machine was used to tabulate the census of that year in the United States, during the total process no more than two and a half years -
Z3
The electromechanical Z3 was built with 2,300 relays, had a ~ 5 Hz clock frequency, and a 22-bit word length. The calculations were performed with purely binary floating point arithmetic. The machine was completed in 1941 (on May 12 of that same year it was presented to an audience of scientists in Berlin). The original Z3 was destroyed in 1943 during a bombing raid in Berlin. -
IBM 1401
The IBM 1401 computer, the first member of the IBM 1400 series, was a variable word length decimal computer, which was released by the IBM company on October 5, 1959, and was withdrawn on February 8, 1971. -
IBM PC
The IBM Personal Computer (in Spanish, IBM personal computer or IBM personal computer), commonly known as IBM PC, is the original version and the progenitor of the IBM PC compatible hardware platform. It is the IBM model 5150, and it was introduced on August 12, 1981 as part of the fifth generation of computers. It was created by a team of engineers and designers under the direction of Don Estridge and William C. Lowe of the IBM Entry Systems Division in Boca Raton, Florida. -
Intel 80386
The Intel 80386, also known as i386 or just 386, is a 32-bit microprocessor introduced in 1985.[2] The first versions had 275,000 transistors[3] and were the CPU of many workstations and high-end personal computers of the time.
