Education

Putting Data in Computers: Input Devices

  • Putting Data in Computers: Input Devices A computer cannot deal with data unless it is coded (translated) in a language it understands. The input unit is provided to translate all data into electronic pulses so that computers (more exactly,......More

Computer Off-line Data Input/Entry

  • Computer Off-line Data Input/Entry Data entered directly into a computer system from on-line terminals can be accumulated in batches for later processing. But that data for batch processing may be transferred from source documents to a......More

Computer On-line Data Input Devices

  • Computer On-line Data Input Devices   Computer Terminals: A computer terminal generally combines input and output functions. It consists of" a keyboard for inputting information direct to the computer, and either a printer or a......More

Computer Keyboard

  • Computer Keyboard Previously data was fed into computer with the help of punched cards only. But due to the advent of microcomputer, it became possible to enter data directly into computer with the help of a keyboard. Keyboard assembly is......More

Computer Joystick and Tracker Ball

  • Computer Joystick and Tracker Ball The computer was originally designed as a device which was meant for only data processing, i.e. for dealing with information and calculations. Later on, it was made possible that a computer could be used......More

Computer Mouse

  • Computer Mouse The most popular pointing device. Graphical interfaces (GUIs) are designed to be used with pointing devices, but key commands may be substituted. However, graphics applications, such as CAD and image editing, demand a......More

Computer Light Pen

  • Computer Light Pen Using a light pen, you can draw sketches or diagrams directly on the screen. The light pen interacts with the screen of microcomputer (VDU: "Visual Display Unit) and thus, can be used to draw on a screen or alter a......More

Computer Graphic Input

  • Computer Graphic Input Information in the form of drawings can be put into the computer by using a graphic pad. A designer uses a graphic pad to produce' a drawing of an electronic circuit board.   A graphic pad has a......More

Computer Graphic Pad

  • Computer Graphic Pad   While it's convenient to maneuver around the desktop using a mouse, anyone who has tried to draw something in Adobe Photoshop or a similar graphics program will attest to certain limitations of the mouse.......More

Computer Scanners

  • Computer Scanners   Scanner is a device that converts the image or document it sees into a digital format that the computer understands. In simpler words, you can use a scanner to put that picture of Antonio Banderas from the......More

Computer Voice Input/Recognition Devices

  • Computer Voice Input/Recognition Devices Input devices do nothing more than convert human language into machine language. Why, does not someone invent a machine that will get a person talk to the computer in English? As a matter of fact,......More

Computer Source Data Input (or Data Capturing)

  • Computer Source Data Input (or Data Capturing)                  The ultimate in data collection 'is to have the computer linked directly to the source of the data.......More

Computer Point-of-Sale (POS) & Financial Transaction Terminals

  • Computer Point-of-Sale (POS) & Financial Transaction Terminals The retail trade in western countries has made increasing use of computers to help process sales of goods at the point-of-sale. Typically, a terminal is situated on the shop......More

Computer Optical Marks Reader (OMR)

  • Computer Optical Marks Reader (OMR)   It is a device for checking the documents and question papers. Nowadays, it is quite a common practice to judge the knowledge and IQ level of a candidate by multiple-choice objective-type......More

Computer Optical Character Reader (OCR)

  • Computer Optical Character Reader (OCR)   This is also a device for reading the documents. It can read alphanumeric characters created in a particular style or good quality paper using special inks. The shape of character is......More

Computer Magnetic Ink Character Reader (MICR)

  • Computer Magnetic Ink Character Reader (MICR)   It uses a special ink that can be magnetized so that the individual characters can be recognized by the reader from the shape of the 'wave form' of the electrical pulse induced......More

Computer Remote Terminal

  • Computer Remote Terminal   A terminal may be situated at the computer site or situated at a place where the data to be input is more readily available. Terminals within 500 feet (150m) or so of the computer are frequently linked to......More

Computer Data Recording Media and Memories

  • Computer Data Recording Media and Memories These can take several forms as shown below: 1. Punched cards and paper tapes 2. Magnetic tapes 3. Magnetic disk and drums 4. Floppy and Winchester disks 5. Tape cassettes 6.......More

Computer Punched cards

  • Computer Punched cards Using punch card is the earliest method of feeding data into a computer. Punched card came into existence in 1887. It was introduced by Herman Hollerith, the father of modern computer. This has been indicated in the......More

Computer Punch Paper Tape

  • Computer Punch Paper Tape This tape is a continuous paper strip rolled on reels and of arbitrary length, says 90m to 300m long. Its width may vary from 12.5 to 75 mm. In this strip, circular holes are punched instead of rectangular. Its......More

Computer Magnetic Tape

  • Computer Magnetic Tape Magnetic tapes and other devices are used to store binary digits. If electricity (electric pulse in fact) is passed through a magnetic material's code then it becomes an electromagnet. If a magnetic tape (i.e. the......More

Computer Magnetic Disks

  • Computer Magnetic Disks Magnetic disk can also be used as input or output device and for auxiliary computer's memory. Magnetic disks are getting very popular with the modem computer. A magnetic disk is similar to the gramophone record......More

Computer Magnetic Drum Memory

  • Computer Magnetic Drum Memory Drum memory is a cyclic memory system. Magnetic drums provide relatively inexpensive means of storing information and have reasonably short access time. The magnetic drum is a cylinder, which is 30 cm in......More

Computer Floppy Disk

  • Computer Floppy Disk   A floppy disk is made of plastic material 20 cm in diameter and coated with minute coating of ferrite of 0075 centimetre thickness. It is called 'floppy , because it is made of flexible plastic. Since the......More

Computer Floppy Drive

  • Computer Floppy Drive We all know diskettes. Small flat disks, irritatingly slow and with too limited storage capacity. Yet, we cannot live without them. Very few PCs are without a floppy drive. Diskettes were developed as a low cost......More

Computer Hard Disk

  • Computer Hard Disk A hard disk is a permanent storage device on your computer. The size of these disks are measured in Megabytes (MB). Typical hard disk sizes range from 850 MB to 2.5 Gigabytes to 6 Gigabytes to 12 Gigabytes. A Disk......More

Computer Receiving the Results (Output Devices)

  • Computer Receiving the Results (Output Devices) When the data has been processed by the CPU and converted into information, the results are in the form of electronic signals. The output unit converts them into a form which could be easily......More

Screens (Visual Display Unit or Monitor)

  • Screens (Visual Display Unit or Monitor) This unit is also capable of acting as 'input' or output' device and is increasingly becoming popular. It consists of keyboard Gust identical to the ordinary typewriter's keyboard) for......More

Computer Printers

  • Computer Printers The printing can be impact-printing, in which a type head produces an impact on a piece of paper on which information is to be typed, or it can be non-impact printing. Non-impact printing machines utilize optical or......More

Computer Graphic Output

  • Computer Graphic Output Modern output graphic can also provide colourful and vivid images for the engineers, architects and businessmen. The computer specifies the X and Y coordinates of the point on the display screen. These numerical......More

Computer Plotters (Tracers)

  • Computer Plotters (Tracers) Plotters, for instance, will draw you a graph or map out the world by tapping pens up and down on a sheet of paper until every patch is appropriately coloured. The bar stretching across. the paper moves......More

Computer Photographic Output: COM

  • Computer Photographic Output: COM   Modern high-resolution photographic film is capable of storing large quantities of data in read- able character form in a relatively small space, arid is consequently useful as an output medium......More

Computer Audio Response Unit

  • Computer Audio Response Unit Just as a voice recognition system will allow you to talk to a computer, so will a voice response system permit a computer to talk back to you. In fact; a computer has probably talked to you many times. For......More

Computer Speech Synthesizer: Sound Output

  • Computer Speech Synthesizer: Sound Output       When a voice is recorded, the component sounds ,'" of the words are broken down into a digital form, i.e. in a series of 'O's and "l 's and stored......More

Computer Tele-Typewriter Terminal (TT Unit)

  • Computer Tele-Typewriter Terminal (TT Unit)   This unit can also be used both as input and output device, and can be connected to a computer either directly by cable or by data communication network, if far away. Such units are used......More

Computer Robotic Arms

  • Computer Robotic Arms   It is only recently that microcomputers have been able to use robotic arms. It is very difficult to make a program for instructing a mass of metal how to move. Imagine all the tin>,' details involved......More

Computer Selection of Devices for Data Feeding and Retrieval Devices

  • Computer Selection of Devices for Data Feeding and Retrieval Devices   The data feeding and retrieval devices are selected based on requirement of information transfer rate and data accessing or retrieval rate....More

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