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An older standard for connecting mice and keyboards. Generally superseded by USB

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A standard for wired Internet access, available on virtually all computers.

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used for connecting diferent peripherals including digital video cameras and external hard disks.

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A modern standard used for connecting a wide variety of perispherals.

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An older standard for connecting hard disk.

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A high speed standard for connecting hard disks, DVD and Blu-ray players.

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are used to connector digital displays to digital video sources.

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used for connecting a standard monitor, either CRT or LCD, to a computer or games console.

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Computers graphics are represented as bits and bytes just like all other computers data.

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ASCII and Unicode are both examples of plain text standards. They specify the characters that make up a text but they do not include ways to specify other formatting attributes such as the front , the front size, features like bold or underline, or coloured text.

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is a more modern coding scheme which aims to solve some of the problems of ASCII. Unicode uses up tp 4 bytes to represent each caracter, allowing many thousands of characters to be represented.

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American Standard Code for information Interchange, is a standard coding scheme for representing text using the English Alphabet.

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Eight bits are grouped together into more meaningful units called bytes. There are grouped into increasingly larger units called Kilobytes, megabytes, gigabytes and terabytes.

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Bits are not very useful because they only represent one of two states: on or off, yes or no, one or zero.

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There are two ways to ensure data is fully removed from your hard disk, by either physically destroying the hard disk or by using special disk wiping software

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output sound from multimedia presentations.Play download sound files.
Can be connected directly to a computer or are built into the monitor or casing.
Audio output of text on the screen helps users with disabilities

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are primarily used in computer-aided design(CAD) applications Can produce solid objects that actually work. Use additive manufacturing  Direct 3-D printing uses inkjet technology

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is very noisy.They can be used in environments. Are a type of impact printer where a print head presses againstan  inked ribbon.
Very cheap to run and maintain.

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are used to produce good quality hard copies.Don’t have large buffers. For use it low output volumes are required. Cheaper to buy than laser printers.

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produce very high quality hard-copy output. The print rate per page is very quick
They rely on large buffer memories where the data is store. For use it low noise is required.

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are plastic credit card style cards.Have a higher storage capacity. Have an embedded processor. The card is inserted in a smart card reader, and then you can access to the data stored on the card.

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are considered relatively secure. Store a small amount of data which is read using a magnetic stripe reader . Bank cards, credit cards and some frequent traveler cards         have magnetic stripe. Are also use to process passengers through automatic gates.

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uses a laser to shine light onto a bar-code label. Used on items in supermarkets. UPC is one standard which defines how a barcode stores its information. The thickness of the lines and the spacing between the lines on the barcode determine the amount of reflected light.

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input devices used by games players. Motion sensors interpret the user’s movement into actions in the game.
Are used in a variety of games. There are many different configurations available that include a variety of buttons and features.

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many laptops have microphones built in to them. Are often used with video-conferencing and voice over IP software. Is required voice recognition software to recognize the words being spoken.  Allows sound data to be input into the computer.

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allows users to interact with computers using their hand or a stylus.Are often used in airports. Also are used in self-service photo kiosks.  Banks use Automatic teller machines

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Are common input device on laptops. Multi-touch pads allow more complex actions to be performed.    using several fingers.
Users of Touch Pads can also use bars at the side to scroll text on the screen.
Are used where there is usually not enough space for a mouse.

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elatively large ball. Don`t move across the desk.
Some laptops had trackballs.Can be more usable than a mouse.

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additional buttons in the middle. Has two buttons
Standard pointing device on most desktop computers Many have a scroll wheel in the center
Can be programmed the bottoms  to perform customizable commands

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is also called software keyboard. Is represented by a series of buttons drawn on a monitor or screen. More accessible.
Users select an option using a pointing device.
They are also useful for small devices.

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each key is programmed to perform a custom function. Typically there are no pre-set keys such as numbers or letters.
They are often 7used in restaurants. Are useful in situation in where the users need to make a quick selection. Each key perform one compound task.

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Most users are familiars. Are present on virtually all laptop and desktop computers. Despite dating back to typewriters in 1870s. The Keyboard change very little over the years Multimedia keyboards are standard QWERTY keyboards with additional hotkeys for opening common applications.

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You can founded in cars, where they control the anti-lock breaking, also you can found in digital cameras, digital watches, and GPS systems. They are often required to run for very long periods without restarting. Many of this embedded systems are also real-time systems.

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Digital cameras, you can make voice calls and send text messages. Also you can run applications. The internet access is standard for smart phones and this sometimes have keyboards or soft keyboards.

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Are somewhere between mobile phones and Netbooks in terms of their size and functionally. Has a larger screen than mobile phones, Many of this not have a keyboard, the screen is used either for touch input using a soft keyboard.

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Has lower specifications than normal, designed for maximum portability. Has very slow processor, a small amount of RAM, and a small, low resolution screen, lower weight and more battery life. The hard disk may also be replaced with a solid state flash drive.

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This computers has simple internet access and word processing, to those powerful enough to replace an average desktop computer. Has standard keyboard and LCD screen of between 14 and 17 inches and a Wi-Fi card to allow wireless access to the internet. Needs additional cooling and this consumes more battery life. Are more easily to loss or to be stolen and if you don’t put any security it can be easy to see your data.

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Are relatively cheap compare with others computers. This computers are common in home, offices and schools. Desktop computers use generic parts with standard interfaces, this makes upgrading and repairing them easier.

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Very high speed, are very similar to supercomputers, this computers process the information very quickly and has a high data throughput. Also are very powerful computers.

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The supercomputers are very fast. This computers have multiprocessing with hundreds or even thousands of separate processors. Has a very big amount of data (thousands of gigabytes of primary store and many Terabytes in secondary store). Are very easily big enough to fill large rooms. Also this computers are very expensive.

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There are many types of computers.