Lesson 4 Four Basic Period of Computer History 131108141425 Phpapp02
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Transcript of Lesson 4 Four Basic Period of Computer History 131108141425 Phpapp02
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Four Basic Periods
ofComputer History
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• Pre-mechanical Age
•
Mechanical Age• Electromechanical Age
• Electronic Age
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Writing and Alphabets
• Petroglyths (signs or
simple figures carved in
rock)
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Petroglyths
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Cave painting from Lascaux, France
(15,000-10,000 B.C.)
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• Ideographs (symbols to
represent ideas andconcept)
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Mayan Ideograph
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• Cuneiform – the first true
written language and the first
real information system. (coo-
nay-eh-form)
• Star – heaven or God
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Cuneiform
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• At around 2000 BC the Phoenicians
created symbols that expressedsingle syllables and consonants
(the first true alphabet)
• Greek adopted the Phoenician
alphabet and added vowels
• Romans gave the letters Latinname to create the alphabet we
use today.
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Papers and pens
• Sumerians – stylus and wet clay
• Egyptians – papyrus plants
(2600 BC)
• Chinese – made paper from rags
(100 AD)
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Stylus and wet clay
Papyrus Plant
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Chinese
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Books and Libraries
(permanent storage device)• Mesopotamia – religious leaders
kept the earliest book• Egyptians – kept scrolls
• Greeks – (600 BC) fold sheets of
Papyrus vertically into leaves and
bind them together.
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First Numbering System
• Egyptian – Vertical lines (|)for numbers 1 – 9
- U or O – 10
- coiled rope – 100- lotus blossom for 1000
• Hindus – (100 – 200 AD) 9 digit numbering
• 875 AD the concept of zero was developed.
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The First Calculator• Abacus – was man’s first recorded
adding machine. Invented in
Babylonia and popularized in China.
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Mechanical Age(1450 – 1840)
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First Information Explosion
• Johann Guttenberg – Movable metal-
type printing process in 1450.
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The first general purpose
computers• John Napier – (1614) a Baron of Merchiston,
Scotland invented LOGS (Logarithm).
•LOGS – allows multiplication and division tobe reduce in addition and subtraction.
• 1614 – Arabian Lattice – lays out a specialversion of the multiplication tables on a set offour-sided wooden rods.(multiply, divide largenumbers and find square and cube root)
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John NapierNapier’s Bone
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• Wilhelm Shickard – 1623 - (Professor at
University of Tubingen, Germany) – invented
the first mechanical calculator that can workwith six digits and can carries digits across
columns.
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• William Oughtred – (1575 – 1660) invented
the slide rule.
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• Blaise Pascal (1642) – invented the Pascaline.
(made of clock gears and levers) that could
solve mathematical problems like addition andsubtraction.
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• Gottfried Leibniz – (1617) invented Stepped
Reckoner that could multiply 5 digit and 12
digit numbers yielding up to 16 digit numbers.
Stepped Reckoner
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• Joseph-Marie Jacquard (1801) developed the
automatic loom (weaving loom) that was
controlled by punched cards.
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• Charles Xavier Thomas de Colmar -1820 –
developed Arithmometer (the first mass
produced calculator)
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• Charles Babbage – invented the difference
engine (1821) and analytical engine (1832).
- Father of modern computer.
Difference Engine Analytical Engine
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• Lady Ada Augusta Lovelace Byron –
1842 – the first computer programmer.
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Electromechanical Age(1840 1940)
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The Beginning of Telecommunications
• Voltaic Battery – first electric battery known
as voltaic pile
- invented by Alessandro Volta
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• Telegraph
Samuel F.B. Morse – conceived of hisversion of an Electromagnetic Telegraph
(1832)
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Morse Code
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• Telephone and Radio
Alexander Graham Bell – 1879 - developedthe first working telephone.
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Guglielmo Marconi – 1894 – (RADIO)discovered that electrical waves travel through
space and can produce and effect far from the
point at which it originated.
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• George Boole – 1852 – developed
the binary algebra known as Boolean Algebra
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Electromechanical Computing
• Pehr and Edward Scheutz – 1853 -
completed a Tabulating Machine,
capable of processing fifteen digitnumbers, printing out result and
rounding off to eight digits.
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Dorr Felt – 1885 – devises the comptometer , a
key driven adding and subtracting calculator.
Comptograph containing a built in printer
Comptometer Comptograph
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Herman Hollerith – father of information
processing.
Punched Card – provided computer
programmers with a new way to put
information into their machines.
He founded the Tabulating Machine Company ,
later became the Computer Tabulating
Recording Company and International
Business Machines Corporation (IBM)
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Herman Hollerith Tabulating Machine
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Otto Shweiger – 1893 – invented the first
efficient four function calculator calledMillionaire.
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Lee de Forest – 1906 – developed vacuum tubes
This is important for it provided electricallycontrolled switch.
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Electronic ge (1941 – present)
Konrad Zuse – 1941 – built the first
programmable computer called Z3.
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Howard Aiken – 1942 – developed Mark I the
first stored program computer.
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John Atanasoff and Clifford Berry – 1942 –
completed the first all electronic computer
called ABC or Atanasoff-Berry Computer
John AtanasoffClifford Berry
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