Unit Description Bit Binary Digit A binary digit

ﻭﺣﺪﺍﺕ ﺍﻟﺬﺍﻛﺮﺓ Unit Description Bit (Binary Digit) A binary digit is logical 0 & 1 representing a passive or an active state of a component in an electric circuit. Nibble A group of 4 bits is called nibble. Byte A group of 8 bits is called byte. A byte is the smallest unit which can represent a data item or a character. Word A computer word like a byte, is a group of fixed number of bits processed as a unit which varies from computer but is fixed for each computer. The length of a computer word is called word-size or word length and it may be as small as 8 bits or may be as long as 96 bits. A computer stores the information in the form of the computer words. ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

ﺃﻨﻮﺍﻉ ﺍﻟﺸﺒﻜﺎﺕ ﻣﻦ ﺣﻴﺚ ﺍﻻﻣﺘﺪﺍﺩ ﻭﺍﻻﺳﺘﺨﺪﺍﻡ � Personal area network (PAN) : 20 to 30 feet. � Local area network (LAN) : small commercial area or in small computer labs. � Metropolitan area network (MAN) : MAN has many applications , it is most commonly used in banks, online reservation systems and in many military based services. � Storage area network (SAN) : a dedicated network that provides access to consolidated, block level data storage. � Wide area network (WAN) : Wide area network is commonly known as internet. The applications and availability of internet can be now seen in every building of commercial or other nature. � Campus area network (CAN) … ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … ﻟﻤﻦ ﻳﺮﻳﺪ ﺍﻟﺘﻮﺳﻊ ﻓﻘﻂ � � � 2400 BC to 300 BC. (technology to support mathematics begins) The first known portable calculator was the abacus. Some claim it originated with the Chinese, but most scholars argue that it was invented by the Babylonians (Encyclopædia Britannica). The concept was first implemented with pebbles and sand or dust on a rock, hence its origins in the Phoenician word abak or sand. Of course if it was a windy day, you couldn't calculate the big figures. As the technology of that period improved, carrying a bag of pebbles, waiting for the right weather, then finding a nice pile of dust or sand then placing a design on it was no longer necessary. The early Roman abacus (picture) to the right created a permanent sand pile grid, the clay tablet. This development led to something better to deal with the problem of easy to lose and displace pebbles. This tablet technology was improved on by putting the pebbles on a string or rod. This design put a number of thinking functions into one highly portable device where they could not get lost and made it easy to quickly move things to the beginning of the sequence. This was the first handheld computer. See thousands of images of different abacus models using Google image search for abacus or try out a simulation of one design of an abacus. 80 BC: the Antikythera mechanism, designed by Greek engineers, was the first known functioning analog computer that perhaps calculated the positions of the stars and planets (Google images) 1500 s AD: Leonardo da Vinci's designs a Mechanical Calculator (picture ; Google images) 1600 s: John Napier creates Napiers Bones (multiplication tables on wood or paper) and logarithms. (picture) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � 1621: William Oughtred invents the slide rule, an early analog computer (picture; Google images). 1642: Blaise Pascal, a French mathematician and philosopher, invents the first operating model of mechanical digital calculator using gears, called the Arithmetic Machine. It used addition to subtract, multiple and divide (picture). 1665: Robert Hooke writes in Micrographia of how our use of eye glasses suggests extensions for all senses (technology conceived to support sense of sight extended to all senses) 1804: Joseph Marie Jacquard used punch cards to automate a weaving loom (pictures; Google images). 1812: Charles P. Babbage, the "father of the computer", discovered that many long calculations involved many similar, repeated operations. Therefore, he designed a machine, the difference engine which would be steam powered, fully automatic and commanded by a fixed instruction program. In 1833, Babbage quit working on this machine to concentrate on the analytical engine (picture; Google images). 1840 s: Augusta Ada is known as "the first programmer" because she suggested that a binary system should be used for storage rather than a decimal system for Babbage's designs (Google images). ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � � 1850 s: George Boole developed Boolean logic which would later become significant to the design of computer circuitry and as a method for refining the searching of information (Google images). 1874: first commercial typewriter was released in 1874, having been patented in 1867 (Google images). 1890: Hollerith's tabulator 1890: Dr. Herman Hollerith introduced the first electromechanical, punched-card data-processing machine which was used to compile information for the 1890 U. S. census. Hollerith's tabulator became so successful that he started his own business to market it. His company would eventually become International Business Machines (IBM). (picture ; Google images) (this paper based machine represents the origin of computer database software) 1906: Lee De Forest invents the vacuum tube which is used as an early form of computer memory holding the values of zero and one by being on or off (picture ; Google pictures). 1910: first commercial implementation of teletype or teleprinters, between New York City and Boston (pictures; Google pictures) 1939: Dr. John V. Atanasoff and his graduate assistant Clifford Berry build the first electronic digital computer (Google images). ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � 1940: The first example of remote computing, using a teleprinter to reach across a telephone line to a computer in New Hampshire which returned answers to New York. The teleprinter is not a computer but connects with and displays interactions with the computer. (picture ; Google images). 1941: Konrad Zuse from Germany, introduced the first programmable computer which solved complex engineering equations. This machine, called the Z 3, was also the first to work on the binary system instead of the decimal system. (Google images) 1947: The giant ENIAC (Electrical Numerical Integrator and Calculator) machine was developed by John W. Mauchly and J. Presper Eckert, Jr. at the University of Pennsylvania. It used 18, 000 vacuum tubes, punch-card input, weighed thirty tons and occupied a thirty-by-fifty-foot space. It was only programmable by changing the wiring, not through software changes, but was productive from 1946 to 1955 and was used to compute artillery firing tables. (Google images) 1947: William Shockley, John Bardeen and Walter Brattain of Bell Labs invented the transistor. In the next decade, vacuum tubes will be replaced by transistors for which they will receive the Nobel Prize in physics in 1956. (images ; Google images) 1951: Mauchly and Eckert built the UNIVAC I, the first computer designed and sold commercially, specifically for business data-processing applications (Google images). 1950 s: Dr. Grace Murray Hopper developed the UNIVAC I compiler. (Google images)(computer supports composition with text) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � 1955 Hiller and Issacson compse the first piece of computer-generated music using the Univac computer, the Illiac String Quartet (computer supports composition with music). � 1957: FORTRAN (FORmula TRANslator), an early computer programming language that was the first to handle loops, repeating sets of computer directions(computer supports complex composition with text) � 1958: Jack St. Clair Kilby and Robert Noyce of Texas Instruments manufactured the first integrated circuit, or chip, which is made up of six components, a feat for which they eventually win a Nobel Prize for physics in the year 2000. This led to hundreds of tiny transistors that fit on a chip of silicon, then thousands, then millions over the next decade. (pictures ; picture 2 ; Google images) � 1960 s: Gene Amdahl designed the IBM System/360 series of mainframe (G) computers, the first general-purpose digital computers to use integrated circuits. (Google images) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � 1962: Ivan Sutherland produces software for drawing and manipulating images in real -time called Sketchpad (computer supports computer image composition) � 1964: IBM produces the MT/ST (the Magnetic Tape/Selectric Typewriter)(this typewriter becomes the first word processor) � 1965: BASIC (Beginners All-purpose Symbolic Instruction Code) programming language developed by Dr. Thomas Kurtz and Dr. John Kemeny. (Google images) � 1960's late: ATM machines introduced, but only allowed cash withdrawal. (Google images) � 1967: A Texas Instrument team of engineers created the Cal-Tech, the first handheld calculator design completed which is marketed three years later by Canon. TI begins to sell its own 4 function Datamath calculator in 1972 for $150. 00. (pictures ; Google images) � 1968: The movie 2001: A Space Odyssey is released. (Google images) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � 1969: A major internet is started as a U. S. government defense agency, ARPANET, needs to connect many machines on many smaller networks. (Google images) � 1970: intel introduces the first 1 k dynamic RAM on a chip which quickly replaces magnetic core memory. (Google images) � 1971: Intel released the first microprocessor, the 4004 (invented by Ted Hoff) a specialized integrated circuit chip which was able to process four bits of data at a time at 108 khz using some 2000 transistors (see 1958). What formerly required many computer chips with connecting wires for the arithmetic, logic and control components, was now on one chip, significantly reducing the complexity and cost of manufacturing the heart of a computer. Storage for data and programs remains on other chips and devices. Eventually, almost every device using electricity will be controlled by a microprocessor. (picture ; Google images) � 1971: PASCAL, a structured or modular programming language, was developed by Niklaus Wirth. (Google images) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � 1972: The first grocery store used computer read bar code on products, a Kroger in Cincinnati, Ohio. (Google images) 1972: The Atari Company invented the first commercially successful coin-operated video game called "Pong" starting the concept of software as simulation and game (Google images) 1973: Texas Instruments introduces the first dynamic random-access memory (DRAM) that is a 4 K-bit chip (Google images) 1973: The first sophisticated computer systems that could scan human tissue were installed at Massachusetts General and Mayo Clinic. Using x-rays, the process takes 4. 5 minutes of scan time then another 20 minutes to process the collected data. The Nobel Prize for the development of Computer Assisted Tomography was awarded to Cormack and Hounsfield in 1979. (Google images) 1973: Classrooms begin using teletype terminals (e. g. , keyboard types on paper) for instructional purposes to interact with remote computers using acoustic couplers (standard telephone handsets placed in an early type of modem to send and receive data), image courtesy of Grace Museum, University of Missouri-St. Louis. 1974: Hewlett-Packard introduces the HP-35, the first scientific handheld calculator (Google images) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � 1974: Robert Moog invented the first practical electronic synthesizer and introduced it to the public in 1964. (Google images)1975: Two young hackers, William Gates and Paul Allen approached MITS and promised to deliver a BASIC compiler. So they did and from the sale, Microsoft was born. � 1976: Cray developed the Cray-I supercomputer (Google images). � 1976: Jobs and Wozniak designed and built the Apple I; then the following year introduced the Apple II microcomputer during a year in which many other personal computer brands are marketed including the Commodore Pet, Tandy/Radio Shack TRS-80 Model I, Atari and Coleco and then more brands appear in the years to follow (Apple pictures ; other PC pictures). � 1978: Arcade video game arrives called Space Invaders. � 1979: Arcade video game by Atari called Asteroids which provided fast action and high score as challenge for others to beat. ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � 1979: Visicalc (a spreadsheet program) is first sold for the Apple II computer (Google images). (computer supports easy mathematical problem solving) � 1980: IBM offers Bill Gates the opportunity to develop the operating system called MS-DOS for its new IBM personal computer (Google images). � 1980: Radio Shack introduces the TRS-80 Pocket Computer. It features a 24 character display, QWERTY keyboard, and 1. 9 KB of programmable memory. Price is US$230. (Google images) � 1981: The IBM PC was introduced with a 16 -bit microprocessor. (Google images) � 1982: Time magazine chooses the computer instead of a person to be its "Machine of the Year. " (Google images) � 1982: CMX/Orrox shows a disc-based editing system for digital video (computer supports composition with video) � 1982: The MIDI (Musical Instrument Digital Interface) became a standard allowing digital electronic instruments to work efficiently with computers. (Google images) � 1982: first digital audio CD discs made available in the 5 -inch size (Google images). ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � � � 1983: The Internet is born when Advanced Research Projects Agency Network (Arpanet) of the US Department of Defense switched over to the TCP/IP protocol from the Network Control Protocol (NCP) on January 1, 1983. The ARPANET (forerunner to today's Internet) which was limited to just 1, 000 machines could now handle millions. Vinton Cerf and Robert Kahn designed the TCP/IP protocol. (Google images) 1983: The movie War Games is released in which a seeker of network computer access stumbles into playing a game that becomes a real prelude to thermonuclear war. (Google images) 1983: Aldus Corporation introduces Pagemaker software for desktop publishing(computer simplifies the merging of text and images, desktop publishing) 1984: Apple introduced the Macintosh computer, which uses a graphical interface instead of the usual text command interface, making the computer much easier to use. (Google images) 1984: The same year, IBM released the 286 -AT. (Google images) 1984: William Gibson authors the book Neuromancer which coins the term cyberspace. (Google images) 1984: Seiko Instruments U. S. A. Inc. displays the first wristwatch computer, with a 10 -character, 4 -line LCD. 1987: Hypercard distributed by Apple Computer, (the computer manages multimedia, integration of many media on one computer screen) 1988: A nondestructive worm was introduced into the Internet network bringing thousands of computers to a halt. ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � � � 1989: The Intel 486 became the world's first 1, 000 transistor microprocessor. (Google images) 1989: Virtual reality software appears from Autodesk and VPL(personal computer supports 3 dimensional (3 D) displays of imagery) By 1990, all known forms of composition can be edited and displayed on one relatively affordable device and on one screen, using the personal computer. 1992: Apple Computer chairman John Sculley coins the term Personal Digital Assistant, referring to handheld computers that typically operate via a stylus on a LCD display. Sculley announces that Apple Computer will enter the consumer electronics market by the end of the year. At the Consumer Electronics Show, Apple Computer announces the Newton pen input device. (Google images) 1992: The movie Lawnmower Man explores possible social consequences of virtual reality computing; Lawnmower Man 2 (due 2003). 1994: Commercialization of the Internet. 1995: Colombia Pictures released The Net, which explored the social issues of personal security and privacy with networked computers. 1995: The Copycat movie explored how computers could be used to animate images and to transmit them. (Google images) 1996: 3 Com debuts the Palm Pilot. 1996: first DVD players made available ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � � 1997: Nokia introduces the Nokia 9000 i Communicator, combining hand-held PC, digital cell phone, and fax: 4. 5 x 1. 4 inch LCD screen, QWERTY keyboard, Geo. Works operating system, Intel 24 -MHz 386 processor, and 8 -MB RAM. Price is US$850 -1000 plus monthly cell phone charge; weight is 14 ounces; size is 6. 5 x 2. 5 x 1. 5 inches. (Google images) 1998: Microsoft announced the Palm PC hand-held computer, running Windows CE 2. 0. (Google images) 1998: Pople and Kohn were awarded the Nobel Prize in Chemistry in this year for showing how to use computers to use the complex equations of quantum-chemical methods to accurately determine three-dimensional structure of molecules. One application of this is the development of new catalysts to generate very specific products such as drugs and plastics. Future applications will include nanomachines and nanocomputers (images). 1999: Palm Computing introduced the Palm VII Connected Organizer handheld computer: 2 MB RAM, and telephone modem port which can be connected to a separate cell phone. Price is US$599; size is 5. 25 x 3. 25 x 0. 75 inches; weight is 6. 7 ounces. Two AAA batteries power the unit for 2 -3 weeks. Connectivity via Palm for email and Internet access costs US$9. 99 for 50 KB transferred per month, or US$24. 99 for 150 KB. (Google images) 1999: The movie The Matrix is released, starring a big brother computer network that is controlling minds and the world. (Google images) 2001: Apple's i. Pod, a digital pocket sized music player is made available. (Google images) ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ

Brief timeline of computers … � � 2002: Crichton authors the book "Prey: A Novel" about a swarms of nanocomputers (the size of molecules) organizing to become new life forms, a work which speculates on and explains the merger of computer, nano, and bio technologies, artificial life, and emergent behavior. (Google images) 2003: First nanocomputer-DNA device designed to play tic-tac-toe and called MAYA; research is underway to make nanocomputing possible through developing quantum replacements for the idea of the transistor (see 1947). 2004: Sony and IBM begin production of cell computer chips, a supercomputer on a chip designed to also be part of teams of chips Other dates being sought ◦ First collections of inexpensive personal computers used to make a supercomputer: cluster or array computing. ◦ First all-in-one wireless handheld and first smart-phone. ◦ First consumer satellite digital access products, for radio and for Internet use. � � 2005 -06: the end of the digital divide is near; Nicholas Negroponte showed prototypes of a $100 laptop to conferences in the fall of 2005; Quantra Corporation won the bid to manufacture the device in January 2006. Mass production began, fall, 2007 with initial price near $200. First big order to Peru, 272, 000 computers. January, 2008, Birmingham, Alabama signed agreement to buy 15, 000 (Google images). 2008: IBM announced the Roadrunner computer, June, 2008, had reached 1 petaflop of computing speed (1, 000 trillion calculations per second). ﻛﻤﺎﻝ ﺍﻟﻤﺼﺮﻱ – ﻣﻘﺪﻣﺔ ﻓﻲ ﻋﻠﻮﻡ ﺍﻟﺤﺎﺳﻮﺏ – ﻏﺰﺓ ﻓﻠﺴﻄﻴﻦ. ﺩ