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Showing posts with label Computer Fundamental. Show all posts
Showing posts with label Computer Fundamental. Show all posts

Sunday, 6 May 2012

What Are Input And Output Devices Of Computer?

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Input Devices
Within processing, input/output, or maybe I/O output device, appertains to the connection between an details processing system (such being computer), and also the outside world, probably a runner, or input device other details digesting program. Inputs would be the signs or maybe data received through the system, as well input device as components would be the signs or maybe data sent as a result. The term may also be used input device during an action; in order to "perform I/O" would be to execute an understanding or maybe result procedures. I/O input device tools are utilized by an individual (or extra system) in order to correspond with education output device. For example, a pc keyboard or perhaps a mouse might be an insight gadget to obtain a pc, while shows as well input device as machines are thought result input device products to obtain a pc. Products concerning connection between pcs, such as modems as well as network credit cards, generally functionality concerning the two insight as well as outcome.

Remember that the specific designation of the device since each insight or maybe result depends on the angle. Mouse as well as keyboards consider because insight bodily actions input device the person customer components as well as convert it straight into signs that the pc can comprehend. The outcome from the product is insight for the pc. In the same manner output device, machines as well as displays consider because insight signs that the pc components. Then they convert these symptoms straight into representations that each users input device can easily see or maybe read. To obtain a individual customer the reading or maybe seeing these illustrations receives insight. These types of connections between pcs as well as humans is researched in an exceedingly industry known as human–computer discussion output device.

Output Devices
Within pc buildings, the specific mixture of the specific CPU as well input device as physical memory (i. electronic. storage the actual CPU can go through as well as compose in order to directly, along with individual instructions) is definitely the mental faculties of the pc, as well as input device from there regarding take a look at any exchange info from or that mixture, for instance in order to or maybe from the drive press, is known as I/O. The specific CPU along with supporting circuitry provide memory-mapped I/O which is used in low-level computer-programming, like the implementation input device regarding gadget drivers. A good I/O protocol is only one made to exploit locality as well as execute efficiently whenever data place secondary storage space, like a drive press.

User interface An I/O input device user interface is essential whenever the specific I/O device is actually input device input device motivated through the processor. The specific interface should have essential logic in order to interpret the device cope with created by the processor chip. Handshaking should be integrated through the interface using appropriate instructions (like ENERGETIC, PREPARED, as well as WAIT), and also input device the processor input device can match having an I/O device through the interface. Whenever different data types are purchased, the specific interface should be effective at convert serial information in order to parallel form as well as vice-versa output device. There has to be provision regarding making interrupts and also the corresponding type quantities for more digesting through the processor when it is necessary.

Education that utilizes memory-mapped I/O has access to hardware by simply writing and reading in order to specific storage areas, utilizing the same assemblage vocabulary recommendations that pc would likely normally use for entry storage space.

Higher-level execution Higher-level os as well as encoding input device amenities utilize distinct, much more fuzy I/O concepts as well as primitives output device. Like most systems supply program programs with the idea of files. The specific Chemical as well as C++ development dialects, as well as systems within the Unix family members, typically fuzy files as well as products since areas, which may be read or maybe composed, or maybe sometimes both. The specific Chemical standard brochure provides capabilities concerning manipulating fields concerning insight as well as input device outcome output device.

Within the context from the ALGOL 68 development vocabulary, the specific insight as well as result amenities are often each known as transput. The specific ALGOL sixty-eight transput catalogue identifies these regular files/devices: wait in, stand out, stay mistakes as well as stay back again.

A substitute for specific primitive abilities would be the I/O monad, that allows plans in order to explain I/O, and also the actions are often completed beyond the plan. This really input device is notable since the I/O capabilities would likely present side-effects to the encoding terminology output device, but this enables strictly useful development to become practical.

Dealing with setting There are lots of ways by which data input device could be read or maybe saved in the specific storage. Every technique is an handling setting, and it has its advantages as well as restrictions.

There are lots of kind of handling modes such as primary dealing with, indirect dealing with, immediate dealing with, index dealing with, centered dealing with, based-index dealing with, implied dealing with, and so on
Main dealing with Within this particular kind of cope with from the data is really a part of the guidelines by yourself. Once the processor interprets the specific training, this has got the storage cope with from just wherever it may be read/written the necessary information output device.

Oblique dealing with Based on the above example, the specific cope with could be saved in another sign-up. For that reason the specific guidelines may have input device the specific sign-up representing the specific cope with. To retrieve crucial computer data, the specific training should be interpreted appropriate creating an account selected. The significance of the specific sign-up to be used regarding handling suitable storage place after output device that data is going to be read/written. This particular handling strategy posseses a benefit against the main mode the creating an account value is flexible therefore the appropriate storage location may also be dynamically chosen.

Port-mapped I/O usually demands the usage of guidelines that are created specifically to do I/O features.

Wednesday, 1 February 2012

Examples Of Input Output Devices

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A fundamental pc program has a pc, keep track of, computer keyboard, as well as computer mouse. There's also a lot of add-ons as well as peripherals that may be additional. Let us check out that they just about all interact.

Should you had been to create a good example in order to the body, the actual pc will be such as the mind, the actual keep track of -- the actual mouth area, the actual computer keyboard as well as computer mouse -  eye as well as ear.... The actual pc regulates all of the performance within the program. Another products exist to provide the actual pc advices and also to supply this along with results.

Let us tell you a good example, let's imagine the consumer squeezes the computer keyboard crucial - ESC. The actual computer keyboard goes by which enter to the pc (the brain). The actual pc after that chooses upon how to proceed with this particular transmission - that depends upon exactly what the actual pc happens to be performing. State the actual pc made the decision which ESC implies that it will leave from what ever software it's presently within. This leaves the applying as well as transmits an indication towards the keep track of (output) to exhibit a brand new image, 1 exactly where which software is actually shut.

You will find loads associated with additional products that may be blocked into the pc, a number of them tend to be enter products, a few result products, plus some tend to be each. A good just about all in a single printer/scanner could be each a good enter as well as a good result gadget, print(output) as well as scan(input).

Occasionally the actual splitting up associated with products is not everything obvious, such as inside a laptop computer. The actual pc, keep track of, as well as computer keyboard are within the exact same container. However the splitting up associated with elements nevertheless is available, even though they do not possess room in between all of them. Within the laptop computer, the actual pc continues to be individual in the computer keyboard as well as in the keep track of, also it nevertheless views these phones end up being input/output products it may contact.

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Some type of computer may be the modernity's essential gadget and also the tag associated with technologies delivered to the actual public. This consists of complicated as well as elaborate buildings however it's very simple to use. The actual plainest description of the pc is actually it signifies the device which gets enter, procedures this after which creates result. The actual system is straightforward within idea however offers huge possible within exactly what issues the different outcomes which come because result. The actual operating theory is actually made with the formula "the enter is available in as well as creates output". Consequently, to comprehend the actual technical procedures which happen within the pc, 1 has to understand concerning the romantic relationship input-output (I/O), thoughts associated with digesting as well as storage space.

Input Devices
The very first concept- I/O- is in the foundation from the exercise of the pc. Some type of computer consists of elements which are split in to 2 courses based on their own perform. Both of these courses tend to be enter components as well as result types. By way of enter products which are attached to the actual pc, the info makes its way into the machine. The actual computer keyboard, the actual computer mouse, scanning devices as well as digital camera models deliver info towards the pc and therefore are types of enter elements. When the pc gets the info, this transmits this in order to result products which create various outcomes. Consequently, the actual picture about the display, the actual seem in the speaker-boxes, the actual webpages imprinted tend to be pictures from the idea result. The actual keep track of, the actual loudspeakers, the actual inkjet printer are thought result products.

The actual modem is really a gadget which deals with each enter as well as result since it gets but additionally transmits info. The actual pc's storage space program is actually an additional instance associated with each input-output working element. The info delivered to the actual pc is actually prepared prior to it's delivered to the actual result products. With no digesting phase, the info would not end up being appropriate any longer and also the pc will be just like a pipe. The actual processor chip accounts for the game associated with changing the actual enter information within result. The actual processor chip works based on a few directions organised as the program.

Output Devices
The final component within the pc formula may be the storage space, that signifies the actual "space" in which the processor chip works it's exercise. Pc storage space is actually associated with 2 types: short-term as well as long-term.

Short-term storage space, also known as MEMORY, materials the actual pc along with storage, exactly where applications operate and also the info is actually saved although it is actually done. Once the microprocessor is not straight focusing on the info, long-term storage space enables the actual pc in order to save information upon storage space press. Hard disk drives, press credit cards, expensive hard disks, optical dvds, Compact disks as well as Dvd disks tend to be this kind of storage space press. These people conserve info which may be remembered with regard to later on make use of.

Producing a good example between your pc as well as the body, MEMORY (random entry memory) is the same as a person's storage. All of us briefly shop info within our mind. To ensure all of us remember this, all of us create this lower. The actual mat associated with document accustomed to create the actual obtained info is the same as long-term storage space.

The actual pc by itself -- the actual equipment -- offers numerous components. However the crucial elements fall under among the 4 groups: processor chip, storage, enter as well as result, as well as storage space.

The actual Processor chip. Digesting may be the process which changes uncooked information in to helpful info. To do this particular change, the actual pc utilizes 2 elements: the actual processor chip as well as storage. The actual processor chip is much like the mind from the pc. This sets up as well as bears away directions which come through possibly the consumer or even the program. Inside a pc, the actual processor chip includes a number of microprocessors that are silvers associated with silicon or even additional materials etch along with numerous small digital circuits. In order to procedure information or even total a good coaching from the person or perhaps a plan, the actual pc goes by electrical power with the circuits.

An individual pc's processor chip is generally a solitary nick or even some potato chips included on the signal panel. In certain effective computer systems, the actual processor chip includes numerous potato chips and also the signal planks which the actual potato chips tend to be installed.

Storage. It's as an digital the begining mat within the pc. Whenever you release a course, it's packed in to storage with regard to quick entry. Because brand new information is actually joined to the pc, it's also saved within storage, however just briefly. The most typical kind of storage is known as arbitrary entry storage or even MEMORY. Consequently, the word storage is often accustomed to imply MEMORY. Information is actually each created in order to as well as study out of this storage. Possibly it is important to consider regarding MEMORY is actually that it's unstable, therefore it requires a continuous way to obtain energy. Whenever you switch off some type of computer, every thing within MEMORY vanishes. Therefore, you need to save your valuable documents to some storage space gadget often.

Enter as well as Result Products. Some type of computer will be ineffective should you couldn't connect to this since the device couldn't obtain directions or even do the trick associated with it's function. Enter products take information as well as directions in the person or even through an additional pc program (such like a pc about the Internet). Result products come back prepared information towards the person in order to an additional pc program.

The most typical enter gadget may be the computer keyboard, that allows characters, amounts, as well as instructions in the person. An additional essential kind of enter gadget may be the computer mouse, that enables you to choose choices through on-screen selections. You utilize the computer mouse through shifting this throughout a set area as well as pushing it's control keys. Virtually every pc offered these days features a computer mouse. Additional well-liked enter products tend to be trackballs, contact patches, joysticks, scanning devices, digital camera models, as well as microphones.

The most typical result products would be the keep track of and also the inkjet printer. The actual pc transmits result towards the keep track of (the show screen) once the person requirements and then begin to see the result. This transmits result towards the inkjet printer once the person demands the document copy- also known as a tough copy- of the record. There are many ink jet printers you are able to select from based on your own require. Study a few on the internet publishing evaluations upon ink jet printers to help you a concept associated with which kind of inkjet printer is actually perfect for you in order to your company. Publishing organization evaluations additionally display what sort of inkjet printer is definitely the peripheral gadget required inside a pc.

Storage space. Some type of computer may perform along with just digesting, storage, enter as well as result products. The same as a few ink jet printers available on on the internet publishing evaluations, these people usually execute a multiple perform work for example inkjet printer, scanning device as well as photo copier. To become truly helpful nevertheless, some type of computer additionally requires a spot to maintain plan documents as well as associated information once they aren't being used. The objective of storage space would be to maintain information completely.

They are points you have to be acquainted with to ensure that whenever you purchase your pc, you'll have a concept exactly how every element functions, as well as therefore, have the ability to deal with all of them.

Examples of Input and output devices of computer

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A basic computer system comes with a computer, monitor, keyboard, and mouse. There are also tons of accessories and peripherals that can be added. Let's take a look at how they all work together.

If you were to make an analogy to the human body, the computer would be like the brain, the monitor - the mouth, the keyboard and mouse - eyes and ears.... The computer controls all the functionality in the system. The other devices are there to give the computer inputs and to provide it with outputs.

Let's run through an example, let's say the user presses a keyboard key - ESC. The keyboard passes that input on to the computer (the brain). The computer then decides on what to do with this signal - which depends on what the computer is currently doing. Say the computer decided that ESC means that it should exit out of whatever application it is currently in. It exits the application and sends a signal to the monitor (output) to show a new picture, one where that application is closed.

There are tons of other devices that can be plugged in to the computer, some of them are input devices, some output devices, and some are both. An all in one printer/scanner can be both an input and an output device, print(output) and scan(input).

Sometimes the separation of devices isn't all that clear, like in a laptop. The computer, monitor, and keyboard are all in the same box. But the separation of components still exists, even if they don't have space between them. Inside the laptop, the computer is still separate from the keyboard and from the monitor, and it still considers them to be input/output devices that it can communicate with.

A computer is the modernity's indispensable device and the mark of technology brought to the masses. It is made of complex and intricate structures but it is very easy to use. The plainest definition of a computer is that it represents a gadget that receives input, processes it and then produces output. The mechanism is simple in concept but has enormous potential in what concerns the various results that come as output. The working principle is rendered through the equation "the input comes in and produces output". Therefore, to understand the technological processes that occur inside the computer, one has to know about the relationship input-output (I/O), notions of processing and storage.

The first concept- I/O- lies at the basis of the activity of a computer. A computer is made of components that are divided into two classes according to their function. These two classes are input parts and output ones. By means of input devices that are connected to the computer, the information enters the system. The keyboard, the mouse, scanners and digital cameras send information to the computer and are examples of input components. Once the computer receives the information, it sends it to output devices that produce different results. Therefore, the image on the screen, the sound from the speaker-boxes, the pages printed are illustrations of the notion output. The monitor, the speakers, the printer are considered output devices.

The modem is a device that handles both input and output because it receives but also sends information. The computer's storage system is another example of both input-output functioning component. The information sent to the computer is processed before it is sent to the output devices. Without the processing stage, the information wouldn't be relevant anymore and the computer would be like a tube. The processor is responsible for the activity of transforming the input data in output. The processor operates on the basis of some instructions structured in the form of the software.

The last part in the computer equation is the storage, which represents the "space" where the processor performs its activity. Computer storage is of two kinds: temporary and long-term.

Temporary storage, also called RAM, supplies the computer with memory, where programs run and the information is stored while it is worked on. When the microprocessor isn't directly working on the information, long-term storage allows the computer to save data on storage media. Hard drives, media cards, flash drives, optical discs, Cds and Dvds are such storage media. They save information which can be recalled for later use.

Making an analogy between the computer and the human body, RAM (random access memory) is equivalent to an individual's memory. We temporarily store information in our head. To make sure we don't forget it, we write it down. The pad of paper used to write the received information is equivalent to long-term storage.

The computer itself - the hardware - has many parts. But the critical components fall into one of the four categories: processor, memory, input and output, and storage.

The Processor. Processing is the procedure that transforms raw data into useful information. To perform this transformation, the computer uses two components: the processor and memory. The processor is like the brain of the computer. It organizes and carries out instructions that come from either the user or the software. In a personal computer, the processor consists of one or more microprocessors which are silvers of silicon or other material etched with many tiny electronic circuits. To process data or complete an instruction from a user or a program, the computer passes electricity through the circuits.

A personal computer's processor is usually a single chip or a set of chips contained on a circuit board. In some powerful computers, the processor consists of many chips and the circuit boards on which the chips are mounted.

Memory. It is like an electronic scratch pad inside the computer. When you launch a program, it is loaded into memory for fast access. As new data is entered into the computer, it is also stored in memory, but only temporarily. The most common type of memory is called random access memory or RAM. As a result, the term memory is commonly used to mean RAM. Data is both written to and read from this memory. Perhaps the most important thing to remember about RAM is that it is volatile, so it needs a constant supply of power. When you turn off a computer, everything inside RAM disappears. Thus, you should save your data files to a storage device frequently.

Input and Output Devices. A computer would be useless if you could not interact with it because the machine could not receive instructions or deliver the results of its work. Input devices accept data and instructions from the user or from another computer system (such as a computer on the Internet). Output devices return processed data to the user or to another computer system.

The most common input device is the keyboard, which accepts letters, numbers, and commands from the user. Another important type of input device is the mouse, which lets you select options from on-screen menus. You use a mouse by moving it across a flat surface and pressing its buttons. Nearly every computer sold today includes a mouse. Other popular input devices are trackballs, touch pads, joysticks, scanners, digital cameras, and microphones.

The most common output devices are the monitor and the printer. The computer sends output to the monitor (the display screen) when the user needs only to see the output. It sends output to the printer when the user requests a paper copy- also called a hard copy- of a document. There are plenty of printers you can choose from depending on your need. Read some online printing reviews on printers to guide you an idea of what type of printer is ideal to you or to your business. Printing company reviews also show how a printer is indeed a peripheral device needed in a computer.

Input And Output Devices
Storage. A computer can function with only processing, memory, input and output devices. Just like some printers found on online printing reviews, they typically perform a multi function job such as printer, scanner and copier. To be really useful however, a computer also needs a place to keep program files and related data when they are not in use. The purpose of storage is to hold data permanently.

These are things you need to be familiar with so that when you buy your personal computer, you will have an idea how each component works, and thereby, be able to take care of them.

Thursday, 19 January 2012

What If Your Windows Taskbar Disappeared?

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One of the most annoying problems with Windows is a missing taskbar. If your taskbar disappeared, the problem stems from human error or other factors. However, it is not too hard to recover your taskbar. The taskbar usually exist at the bottom of your Windows screen. However, you may have positioned it on the left or right side of the screen. It may also be "hiding". However, if it hasn't reappeared after a Windows' restart, here are some reasons why the taskbar disappeared.

Reason 1: Taskbar is hiding
A missing taskbar can be the result of the "hide" feature in the taskbar properties menu. Often the taskbar properties can quickly solve your problem, You can use the taskbar properties by using the Windows search feature. Go to the Start menu, type "taskbar" into the search bar then choose Customize the Taskbar. Simply uncheck the Auto-Hide feature.
If your taskbar disappeared, try pressing CRTL-ESC. This will immediately give you access to the taskbar and Start menu, once you have forced the taskbar to appear, you can use the properties menu. Remove the check from Auto-hide feature.

Reason 2: Taskbar has moved
You can sometimes find the task bar hanging out in other positions such as the top and side of your desktop. Move your mouse pointer to see if the taskbar reappears at extreme locations on your desktop. If it's reappears, you can simply click and drag it to other parts of the screen. Once it's in the desired position, lock it by right clicking the taskbar and choosing properties. Finally, choose the lock the taskbar feature by right-clicking to bring up the properties menu.

Reason 3: Taskbar is too small
The bar can reduce and enlarge with ease. However, if it's too thin, it's difficult to see. So if your taskbar disappeared, try searching for a thin line at the previous taskbar site. You can "fatten" the task bar by clicking the edge of the taskbar and dragging it to a larger scale. Be sure that the taskbar isn't locked. If it is, you cannot do this action.
Using the Task Manager
Using the task manager to restart or restore the taskbar is often a viable option. You can open the task manager by simply pressing Ctrl-Alt-Del This will bring up the task manager utility. Once the program opens, choose file then the Run New Task option, type "taskbar" to reset explorer and the taskbar.

Reason 4: You have a virus
One thing to remember about a missing taskbar is that it may just be hiding or obstructed. However, there are some cases were a virus will remove the taskbar completely, in this case, you should run your security software and try to detect the culprit. Often in this case, using system restore may also give you a quick solution to a missing taskbar.

Saturday, 7 January 2012

What is computer Hardware?

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Computer Hardware : In a simple way - What you can touch or see called as computer hardware. This is the simplest definition of computer hardware.  
Here I am going to give you some more examples of computer hardware.

Computer Hardware Parts
Hardware is any part of your computer that has a physical structure, such as the computer monitor or keyboard.

Wiki definition of computer hardware : 

Personal computer hardware are component devices which are typically installed into or peripheral to a computer case to create a personal computer upon which system software is installed including a firmware interface such as a BIOS and an operating system supporting application software that performs the operator's desired functions. Operating systems usually communicate with devices through hardware buses by using software device drivers.
Computer Hardware
Computer accessories which you can define as  a computer hardware are listed below.
  1. C.PU (Central Processing Unit) 
  2. Monitor
  3. Keyword
  4. Printer
  5. Scanner
  6. Joystick
  7. Motherboard 
  9. Mouse
  10. Microphone
  11. Speaker
  12. Light Pen
  13. Touch pad
  14. Hard Disk
  15. SMPS (Switch Mode Power Supply)

Sunday, 1 January 2012

Input and Output Devices of computer.

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In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it. The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation. I/O devices are used by a person (or other system) to communicate with a computer. For instance, a keyboard or a mouse may be an input device for a computer, while monitors and printers are considered output devices for a computer. Devices for communication between computers, such as modems and network cards, typically serve for both input and output.

Here are some images of Computer's Input and Output Devices.

Input and Output Devices

Printer - An Output Device

Images of Input and Output devices

Keyboard - A input device of computer

Mouse - A input device of computer

Monitor - A input device of computer

Printer - A input device of computer
For detailed HTML tutorials, you can visit my another blog called My Computer Tuts.

Thursday, 29 December 2011


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The CRT or display that shows the words, graphics, etc., to the user. It is a critical part of a user’s interface.
A printed circuit board that has (at least) slots to connect cards into.
Often, they also include a CPU and memory.
An input device which has one to three buttons and when you move it, it causes the arrow in a Windows display to move.
An external device that takes commands and data from the computer to place on paper. There are several types of printers: daisy-wheel, matrix, laser, thermal, inkjet, and plotter.
“Random Access Memory“. A pool of storage for the CPU. It can be
written to/read from in any order (unlike a VCR tape which is serial—
you have to wind to the place you want). There are several types of
“Read Only Memory“. Memory that has imprinted in it data and
programs for the CPU which cannot be erased or written to.
An external device that is able to optically read in printed material—kind of like a copier, but it stores the image on the computer instead.
“Uninterruptable Power Supply”. This is a box that is like a surge
protector but will keep you going even if you lose power. You can plug your computer into. If you have a brown- or black-out, this unit will keep you running for 3 minutes to an hour (certainly enough time to save your work and shutdown the computer).
A disk made of plastic and aluminum which can store up to 650MB of
data. Usually these disks cannot be written to, instead they often are
used to distribute software from companies.
Central Processing Unit. The “brain” of the computer. It executes
commands which, eventually, we see as a response to our input.
Without the CPU, the computer is nothing.
Hard disk
A medium to store data for the computer while the power is out. It uses a hard material (typically aluminum).
A typewriter-like tool that has keys. Sends letters or commands to the computer.
A CPU that composes only one chip. Some CPUs may actually be
several square feet is size; but, the microprocessor is designed to be
100% self-contained in a single chip.
A device that will let your computer talk to other computers through the telephone line.
The next generation CD-ROM which will store 10-20x the current
Card Slot
The slots found on the PC motherboard may be one of five types: ISA EISA, MCA, VESA & PCI.. Slower adapters (like I/O boards) can be ISA. But for the best performance, use VESA or PCI for hard drives, CD-ROMs or Video adapters.
Cable Cache
A thick wire that connects the computer to the external device or power. An interface between the CPU and the memory (RAM and ROM). It helps the CPU keep running even though the RAM may be too slow. It does this by keeping a copy of what the processor has read/written.
Most of the time it refers to a card that plugs into the motherboard
adding special capabilities not originally found on the computer. Other times it refers to tools to convert one connector type to another.

Tuesday, 27 December 2011

What are Output Devices Of Computer?

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Output Devices: Output Devices of computer are those devices which are used to communicate the computer for displaying process data to the user which is operating the computer. These days many devices are used as output devices of a computer. Most of the computer users only aware of Monitor and Printer as output devices of computer. There are also other output devices which we are using as output devices of a computer. Below are the list of computer output devices.

Output Devices Of Computer
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.

In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world. Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the outside.
Examples of output devices:
Headphone - Output Device
  • Speakers
  • Headphones
  • Screen (Monitor)
  • Printer
Some more images of Output Devices :

Monitor - Output Device

Printer - Output Device

Speakers - Output Device

What Are Input Devices Of Computer?

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In the world of computing, input devices are any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or other information appliance. Input and output devices make up the hardware interface between a computer and a scanner. Normally, Input devices of computers are used to give instructions to the computer and output has to be processed through processing devices to output devices. Keyboard and mouse are two famous input devices of a computer which is used in every computer. These days we are also using some latest input devices like Light Pen, Trackball Mouse, and pen drives. Below are some images of input devices of computer:
Keyboard - Input Device

Mouse - Input Device

Scanner - Input Device
Input Devices - Keyboard And Mouse

USB/Pen Drive - Input Device

Many input devices can be classified according to:
  • modality of input (e.g. mechanical motion, audio, visual, etc.)
  • the input is discrete (e.g. key presses) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous)
  • the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CAD applications)
Pointing devices, which are input devices used to specify a position in space, can further be classified according to:
  • Whether the input is direct or indirect. With direct input, the input space coincides with the display space, i.e. pointing is done in the space where visual feedback or the pointer appears. Touchscreens and light pens involve direct input. Examples involving indirect input include the mouse and trackball.
  • Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g. with a mouse that can be lifted and repositioned)
Mouse - Input Device

Direct input is almost necessarily absolute, but indirect input may be either absolute or relative. For example, digitizing graphics tablets that do not have an embedded screen involve indirect input and sense absolute positions and are often run in an absolute input mode, but they may also be set up to simulate a relative input mode where the stylus or puck can be lifted and repositioned.

Read detailed article about Input Devices here :

Sunday, 6 November 2011

What is Operating System?

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Operating System:-  Operating System is an interface between user and hardware.
  It is used to manage the resources of a system and to create an environment where a user can work.
Operating System

Write down the task of an  Operating System:
Task of an Operating System:-
  • I/O Management
  • Power Management
  • Resources Management
  • File Management
  • Process Management