1.ABACUS (ADDITION AND CALCULATION UTILITY SYSTEM)
This was the first mechanical device developed in about
600B.C. . A modern ABACUS developed by John Napier,
this is called (Napier’s bones ABACUS Machine / Scottish Mathematician
calculator). ABACUS was consists of wooden frame with vends on parallel wires
and cross bar oriented perpendicular to the wire that is, each wire represents
one could represent decimal system. By the moving beds one could represent
various number ABACUS could perform simple addition, subtraction. The ABACUS
used in China and Japan.
2.PASCAL'S ADDING MACHINE:
The first mechanical device developed by
baize PASCAL’S known as PASCL’S Adding
Machine in 1642. Baron Got reified with
Frovonleibiz of Germany invented the first
calculator.
3.HOLLERITH PUNCH CARD:
Dr. Herman Hollerith came up with the concept of punch cards, which as invention and very company later became words large it computer manufacturing the IBM (International Business Machine).
4. ANALYTICAL ENGINE:
In 1842, Babbage came up with Analytical Engine has intended basic
Arithmetic function. But these machines were difficult manufacturing at the
precision engineering required manufacturing at that time. Charles Babbage
nineteen century professor Cambridge university, is the consider the father of
modern digital computer. During the periods mathematical and statistical tables
were prepared by a group clerks could not eliminate errors. The designed
“difference engine” in 1822.
5. MARK-1 COMPUTER (1937-1944):
This was the first holly automatically calculating machine
designed by Howard A. Aiken. The design
of based on the technique of punching card machinery. In this technique both mechanical
and electronically computer used.
6. ABC 91939-1942) (Atansoff – Berry computer)
This computer was developed by Dr. John Atansoff of solve certain
mathematical education. It is used in 45 volt vacuum tubes for internal logic
and capacitors for store.
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7. ENIAC (Electronic Numerical Integrated and Computer) (1943-1946)
It was the first electronic computer. It was introduced by two
electronically engineer. John W. Mache and J. Presses Eckert. Eckert of
Pennsylvania developed the first electronic computer transition for U.S Army.
It was the capacity of to do 30 multiplications per second.
8. EDVAC (Electronic Discrete variable Atomic Computer) (1946-1952)
Evian was the program wired on board made it difficult to change
then. To overcome the eniac was designing. The basic idea of concept that
sequence of instructions of stored in the memory of computer for automatically
directing the flow of operation.
9. UNIVAC (Universal Automatic Computer) (1951-1951)
The UNIVAC was first digital computer to be install in the census
bureau in 1951, was used continuously for 10 years. 1952 IBM (International
Business Machine) introduced 701 commercial computers. These computers used in
scientific business purpose.
10. MANCHESTER MARK- 1
Manchester mark-1 was developed in Manchester University (Store program concept). It was developed MHA Newman. (store capacity 32 words Each 32 binary digit).
11. LOGARITHMS
A logarithm was developed by Napier.
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