History of Computers

History of Computers. Ancient Times In the beginning, man used his fingers and toes to perform simple computations such as addition and subtraction. 0 th Generation(before 1939). - PowerPoint PPT Presentation

Slide 1toes to perform simple computations such as
addition and subtraction.
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3000 BC - The first man-made computing device is the “Abacus”. In the Abacus, small beads are arranged on a series of vertical rods in a manner that by manipulating them, it is possible with some skill and practice, to make rapid calculations.
0th Generation(before 1939)
1614AD – Napier's bones
John Napier (1550-1617), a Scottish mathematician, invented the Napier’s Bones - an aid to multiplication.
A set of bones consisted of nine (9) rods, one for each digit 1 through 9. A rod is essentially one column of a multiplication table.
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John Napier
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adopted partly the principles of the abacus but
did away with the use of the hand to move the
beads or counters. Instead, Pascal used wheels
to move counters.
improvements on Pascal’s machine. With
Leibnitz’s improvements, it was possible for
the machine to divide and multiply as easily
as it could add and subtract.
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Charles Babbage
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Charles Babbage made ANALYTICAL ENGINE (In 1833) DIFFERENTIAL ENGINE (In 1883)
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Analytical Engine
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Difference Engine
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data storage rather than decimal.
1880 – Dr.Herman Hollerith developed the punched
card that would contain data coded in form of punched
holes.
Herman Hollerith
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Fourth Generation (1971-1990) - microprocessor
Fifth Generation (from 1991 )
1939 – Dr. John Vincent Atanasoft produced the first prototype electronic computer.
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1944 – Aitken built Mark 1 the first automatic, sequence controlled calculator; used by military to compute ballistic data.
1947 – Mauchy and Eckert built ENIAC – 2nd Electronic digital computer.
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1949 – Maurice, Eckert and Von Neumann built EDVAC the -1st stored program computer.
1950 – Turing built Ace – 1st programmable computer.
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commercially sold.
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Integrated circuits.
produced PDP-1 – 1st Mini computer.
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Intel 4004.
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Apple Microcomputer.
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Present state
Palm Top
Multiple users; time- sharing
Multiple users; distributed  systems