COMPUTERS
what is a computer ?
a computer is any device which aids humans in performing various kinds of computations or calculations. the earliest computer was the abacus , used to perform basic arithmetic operations. every computer supports some form of input ,proccesing, and output.
a computer is any device which aids humans in performing various kinds of computations or calculations. the earliest computer was the abacus , used to perform basic arithmetic operations. every computer supports some form of input ,proccesing, and output.
HISTORY
2400 BC Abacus: the first known calculator, was invented in
Babylonia
1622 William Oughtred:
develops slide rules
1822 Charles Babbage: designs his first mechanical computer
1869 William Stanley Jevons:
William Stanley Jevons designs a practical logic machine
1878 Ramon Verea: Ramon Verea
invents a fast calculator with an internal multiplication table
1943 Enigma: Adolf Hitler uses the Enigma encryption machine Colossus: Alan Turing develops the the code-breaking machine Colossus
1964 Word processor: IBM introduces the first word processor
1967 Floppy Disk: IBM creates the first floppy disk
1975 Portable computers: Altair produces the first portable
computer
1976 Apple: Apple Computers was founded Steve Wozniak and Steve
Jobs
MODEM: Ward Christensen writes the programme "MODEM" allowing
two microcomputers to exchange files with each other over a phone line
1978 Magnetic tape: The first magnetic tape is developed in the
US
1979 Over half a million computers are in use in the United
States.
1987 Microsoft introduces Microsoft Works
1987 Microsoft introduces Microsoft Works
1991 The World Wide Web: The World Wide Web is launched to the public on
August 6,
Hotmail: Hotmail is started by Jack Smith and
Sabeer Bhatia.
1996 WebTV: WebTV is introduced
1997 Altavista introduces its free online translator Babel Fish
Microsoft acquires Hotmail
1998 Google: Google is founded by Sergey Brin and Larry Page on
September 7, 1998
PayPal is founded by Peter Thiel
and Max Levchin
2001 Xbox: Bill Gates introduces the Xbox on January 7th 2001.
2002 Approximately 1 billion PCs been sold
PayPal is acquired by eBay
2005 September 12: eBay acquires Skype
2006 Skype announces that it has over 100
million registered users.
EVOLUTIONS
first generation computers 1940s-1950s
first electronic computers used vacuum tubes,and they were huge and complex. the first general purpose electronic computer was the ENIAC electronic numerical integrator and computer .it was digital but it didn't operate with binary code .
second generation computers 1955 -1960
the second generation computers came about thanks to the invention of the transitor, which then started replacing vacuum tubes in computer design. transitor computers consumed far less power and were much smaller .
third generation computers 1960s
first appeared minicomputers that were still based on non microship transitors they were much smaller and cheaper than first and second generation of computers .
first electronic computers used vacuum tubes,and they were huge and complex. the first general purpose electronic computer was the ENIAC electronic numerical integrator and computer .it was digital but it didn't operate with binary code .
second generation computers 1955 -1960
the second generation computers came about thanks to the invention of the transitor, which then started replacing vacuum tubes in computer design. transitor computers consumed far less power and were much smaller .
third generation computers 1960s
first appeared minicomputers that were still based on non microship transitors they were much smaller and cheaper than first and second generation of computers .
fourth generation 1971-present
first microchips -based central processing units consisted of multiple microchips for different CPU components . where all of the neccesary cpu components were put onto a single microship , called a microprocessor.
portable computersfirst microchips -based central processing units consisted of multiple microchips for different CPU components . where all of the neccesary cpu components were put onto a single microship , called a microprocessor.
the first laptop that was commercialized was osborne 1 in 1981 with a small 5´CRT monitor and a keyboard that sits inside of the lid when closed
HOW IT WORK
A computer works by manipulation of binary coded symbols (numbers), according to lists of binary coded instruction symbols. Everything in an electronic (digital) computer is binary coded symbols, whether it is data or instructions.
EVALUATION
1-Who believe the mechanical computer?
a- William Oughtred
b- Charles Babbage
c- Ramon Verea
2-what is a computer ?
a- is any device which aids humans in performing various kinds of computations
b- the earliest computer was the abacus
c-develops slide rules
