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A computer is a machine for manipulating data according to a list of instructions known as a program. In the 1960s, computers were in wide industrial use for many purposes,mainly performing scientific calculations,often to support military objectives. Computer engineers at research institutions throughout the US began to link their computers together using telecommunications technology in the 70's. As computers have become smaller,computers for individual use, called personal computers, and their portable equivalent,the laptop computer,are ubiquitous information-processing and communication tools and are perhaps what most non-experts think of as (a computer). In the 1980s,

Personal Computers

became popular for many tasks,including book-keeping,writing and printing documents,calculating forecasts and other repetitive mathematical tasks involving spreadsheets.

The most common form of computer in use today is the embedded computer, small computers used to control another device. Embedded computers control machines from fighter aircraft to digital cameras.

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On a
Typical Personal Computer
Input devices include objects like the keyboard and mouse, and output devices include computer monitors, printers. Typically, on each clock cycle, the computer fetches instructions and data from its memory. The instructions are executed, the results are stored, and the next instruction is fetched. Instructions, like data, are represented within the computer as binary code,a base two system of counting. More powerful computers such as minicomputers, mainframe computers and servers may differ from the model above by dividing their work between more than one main CPU. Multiprocessor and multicore personal and laptop computers are also beginning to become available. Computer programs are simply lists of instructions for the computer to execute. These can range from just a few instructions which perform a simple task, to a much more complex instruction.

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Computer hardware is the physical part of a computer.

Most computer hardware is not seen by normal users. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. Personal computers, the computer hardware familiar to most people, form only a small minority of computers. A typical personal computer consists of a case,motherboard,Central processing unit (CPU),Random Access Memory,(BIOS),PCI bus PCI-E or AGP bus,USB,Power supply,CD - the most common type of removable media, cheap but fragile. CD-ROM Drive CD Writer DVD DVD-ROM Drive DVD Writer DVD-RAM Drive Floppy disk Zip drive USB Flash Drive Tape drive,Hard disk - for medium-term storage of data. Disk array controller Sound card - translates signals from the system board into analog voltage levels, and has terminals to plug in speakers. Networking - to connect the computer to the Internet and/or other computers Modem - for dial-up connections Network card - for DSL/Cable internet, and/or connecting to other computers. Other peripherals such as a keyboard.Pointing devices Mouse Trackball Gaming devices Joystick Gamepad Game controller Image, Video input devices Image scanner Webcam Audio input devices Microphone Output or Output devices Image, Video output devices Printer Monitor Audio output devices Speakers headset
Computer software is an alternative term for computer programs.
Going from the extremely simple capabilities of a single machine language instruction to the myriad capabilities of application programs means that many computer programs are extremely large and complex. A typical example is Windows XP, created from roughly 40 million lines of computer code in the C++ programming language. Software engineering has attempted, with some success, to make the process quicker and more productive and improve the quality of the end product. Many of the most powerful supercomputers available today July 22th 2006,are also used for nuclear weapons. Sound, still pictures, and video are now routinely created ,i use cakewalk music studio. Perhaps the most famous computer-controlled mechanical devices are robots. Robots have become commonplace in mass production. A very large proportion of personal computers regularly connect to the Internet to communicate and receive information including wireless. Final Summary. A virus is a small piece of malicious software,An e-mail virus replicates itself by automatically mailing itself to dozens of people on your mailing list,A worm or security hole,A Trojan horse may erase your hard disk. Viruses pass from computer to computer so don't get one. Protect yourself against computer viruses. A quick and easy way to do that is through various software applications.

Next Generation Media Center Super Computers You can Get Microsoft's Media Center Edition operating system on a notebook,although it had its start on a desktop PC. The new Macintosh Media Center desktop computer. Many Media Center PCs have dual-core processors fast enough to handle DVR, music, and other tasks simultaneously. A gigabyte of system memory should be considered a minimum for a Media Center PC. Offered for under $800.

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