History of computer 1. abacus 2.A pre-electronic computer . . .

1. HISTORY OF COMPUTER
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2.  The Abacus
 The First Computers were invented by the
Chinese about 2500 years ago.
 The abacus shown in Figure 1.1, is a
calculator,
 The Chinese used it to add, subtract, multiply,
and divide.
 (Find by archeological department)

3.  The Analytical Engine (A Pre-Electronic
computer)
 The first mechanical computer was the analytical
engine, conceived and partially constructed by Charles
Babbage in London, England, between 1822 and
1871.
 People called Father of Computer’s to Charles
Babbage.
 It was designed to receive instructions from punched
cards, make the calculations with the aid of a memory
bank, and print out solutions to math problems.

4.  The First Electrically Driven
Computer
 The first computer designed expressly for data processing was
patented on January 8, 1889, By Dr. Herman Hollerith of New York.
 The prototype model of this electrically operated tabulator was built
for the U.S. Census Bureau to compute results of the 1980 census.
Using punched cards containing information submitted by
respondents to the census questionnaire, the Hollerith machine made
instant tabulations from electrical impulses actuated by each hole.
 It then printed out the processed data on tape. Dr. Hollerith left the
Census Bureau in 1896 to establish the Tabulating Machine Company
to manufacture and sell his equipment. The company eventually
become IBM. And 80-column punched card used by the company.

5.  The Digital Electronic Computer
 The first modern digital computer, the ABC
(Atanasoff-Berry Computes), was built in a basement
on the lowa State University campus in Ames. Lowa,
between 1939 to 1942.
 The development team was led by john Atanasoff, a
professor of physics and mathematics, and Clifford
Berry, a graduate student.
 This machine utilized concepts still in use today:
Binary, arithmetic, parallel processing, regenerative
memory, separate memory, and computer functions.
 When completed, it weighed 750 pounds and could
store 3000 bits. (4 KB) of data

6.  In 1945 ENIAC (Electronic Numerical Integrator
and Computer)
 Begun as a classified military project, ENIAC was designed to prepare
firing and bombing tables for U.S. army and Navy.
 It weighed 30 tons. And used 19,000 vacuum tubes, 1500 relays, and
hundreds of thousands of resistors, capacitors, inductors, it required 200
kilowatts of electrical power to operate.

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