Category: Education

Presentation Description

The various input , output and secondary storage devices are presented here...


Presentation Transcript

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Input devices

Keyboard : 


Keyboard : 

Keyboard A keyboard has many small buttons on it called keys . There are 101 keys ( app.) available in a keyboard . It is used to give the input . The keyboard is connected to the CPU by a wire .

Keyboards : 

Keyboards Keyboards are of FOUR types Normal keyboard Flexible keyboard Ergonomics keyboard Virtual Keyboard

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Normal keyboard

Flexible keyboard : 

Flexible keyboard

Ergonomics keyboard : 

Ergonomics keyboard

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Ergonomics keyboard & mouse

Virtual Keyboard : 

Virtual Keyboard

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Working using Bluetooth network

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Mechanical mouse:

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Optical mouse

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Infrared (IR) or radio frequency cordless mouse:

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A mouse with many buttons

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Trackball mouse

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Stylus mouse

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Cordless 3-D mouse

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Flatbed Scanners

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Transparency Scanners

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Handheld Scanners

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Drum Scanners

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Barcode reader A barcode is an optical machine-readable representation of data relating to the object to which it is attached. Originally barcodes represented data by varying the widths and spacing's of parallel lines, and may be referred to as linear or one-dimensional (1D) A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes

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Digital camera

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Touch screen

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MICR Magnetic Ink Character Recognition, or MICR, is a character recognition technology used primarily by the banking industry to facilitate the processing of cheque and makes up the routing number and account number at the bottom of a cheque. The technology allows computers to read information (such as account numbers) of printed documents. Unlike barcodes or similar technologies, however, MICR codes can be easily read by humans.

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OCR Optical character recognition, usually abbreviated to OCR, is the mechanical or electronic conversion of scanned images of handwritten, typewritten or printed text into machine-encoded text. It is widely used as a form of data entry from some sort of original paper data source, whether documents, sales receipts, mail, or any number of printed records

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OCR The dual illumination OCR reader captures code lines from Machine

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OMR Optical Mark Recognition  (also called Optical Mark Reading and OMR) is the process of capturing human-marked data from document forms such as surveys and tests. OMR machine is used in evaluating MCQ

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LIGHT PENS A light pen is a computer input device in the form of a light-sensitive and used in conjunction with the computer's CRT monitor. It allows the user to point to displayed objects, or draw on the screen, in a similar way to a touch screen but with greater positional accuracy. A light pen can work with any CRT-based monitor, but not with LCD screens, projectors or other display devices. However, due to the fact that the user was required to hold his or her arm in front of the screen for long periods of time, the light pen fell out of use as a general purpose input device

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MAGNETIC READER The Universal Magnetic Swipe Reader can read any combination of up to three tracks of magnetic information with a single swipe in either direction. An audible tone and a visual LED signal indicate a successful read. The Universal Magnetic Swipe Reader accepts both high and low coactivity magnetic cards, and can read all ISO 7811, AAMVA and California Driver's license, and custom data formats.

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SMART CARD READER Smart reader/writers make access control and read/write applications more powerful, more versatile, and most importantly, offer-enhanced security through encryption and mutual authentication.

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NOTES TAKER Smart note taker (or digital pen)--- portable handwriting capture device using handwriting recognition technology to capture your hand writing notes, drawings, sketches anytime, anywhere then upload, file, email your handwriting notes, drawings, sketches once connected to computer.

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A microphone  a mic or mike is an acoustic-to-electric  transducer or sensor that converts sound into an electrical signal. Microphone

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Output devices

Monitor : 


Monitor : 

Monitor The screen of the computer is known as Monitor. It looks like TV , But it is not a TV. It displays alphabets ,numbers , pictures & movies . The size of the monitor is measured in INCHES


TYPES OF MONITORS CRT (Cathode Ray Tube) LCD (Liquid Crystal Display) Plasma Touch Screen OLED (Organic Light Emitting Diode)

CRT Monitor : 

CRT Monitor Now-a-days this kind of monitors are no more in production.

LCD (Liquid Crystal Display) : 

LCD (Liquid Crystal Display)

Plasma : 


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Speakers, or multimedia speakers, are speakers  external to a computer, that disable the lower fidelity built-in speaker. They often have a low-power internal amplifier. SPEAKERS

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PRINTER A printer is a peripheral which produces a text or graphics of documents stored in electronic form, usually on physical print media such as paper or transparencies.


TYPES OF PRINTERS IMPACT PRINTERS Dot-Matrix Printers Daisy-Wheel Printers Line Printers NON – IMPACT PRINTERS Inkjet printers Laser printers Solid ink printers Dye-sublimation printers Thermal wax printers Thermal auto chrome printers

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IMPACT PRINTERS Impact printers are the oldest printing technologies still in active production. Some of the largest printer vendors continue to manufacture, market, and support impact printers, parts, and supplies. Impact printers are most functional in specialized environments where low-cost printing is essential.

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1. Dot-Matrix Printers Here the paper is pressed against a drum (a rubber-coated cylinder) and is intermittently pulled forward as printing progresses. The electromagnetically-driven print head moves across the paper and strikes the printer ribbon situated between the paper and print head pin. The impact of the print head against the printer ribbon imprints ink dots on the paper which form human-readable characters. Most dot-matrix printers have a maximum resolution of around 240 dpi (dots per inch). It is ideal for environments that must produce carbon copies.

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Dot-Matrix Printers

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If you have ever worked with a manual typewriter before, then you understand the technological concept behind daisy-wheel printers. These printers have print heads composed of metallic or plastic wheels cut into petals. Each petal has the form of a letter (in capital and lower-case), number, or punctuation mark on it. When the petal is struck against the printer ribbon, the resulting shape forces ink onto the paper. Daisy-wheel printers are loud and slow. They cannot print graphics, and cannot change fonts unless the print wheel is physically replaced. 2. Daisy-Wheel Printers

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Metal Daisy Wheel for Xerox & Diablo printers Daisy-Wheel Printers

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3. Line Printers It is somewhat similar to the daisy-wheel is the line printer. Line printers allow multiple characters to be simultaneously printed on the same line. The mechanism may use a large spinning print drum or a looped print chain. As the drum or chain is rotated over the paper's surface, electromechanical hammers behind the paper push the paper (along with a ribbon) onto the surface of the drum or chain, marking the paper with the shape of the character on the drum or chain. line printers are much faster than dot-matrix or daisy-wheel printers. But tend to be quite loud, have limited multi-font capability, and often produce lower print quality than more recent printing technologies. Because line printers are used for their speed, they use special tractor-fed paper with pre-punched holes along each side. This arrangement makes continuous unattended high-speed printing possible, with stops only required when a box of paper runs out.

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Line Printers

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Non-IMPACT PRINTERS All the impact printers print slow due to the slow mechanical movement of the print head. Efforts were made to eliminate the mechanical motion of the print head to increase the speed of the printers and as a result non-impact printers were developed. Nonimpact printers use methods for creating an image that don't involve actually touching the paper

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1. Inkjet printers Inkjet printers spray tiny drops of ink onto the paper.

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2. Laser printers Laser printers use static electricity to arrange toner on paper to form an image. The toner is then bonded to the paper with heat.

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3. Solid ink printers Solid Ink color printers and MFPs are also very efficient with the use of the ink. Because there is no cartridge virtually all the ink gets used so customers get more out of their printer. Solid Ink sticks are easy to store. T he packaging is so small you can store your extra set of ink sticks in your desk drawer

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4. Dye-sublimation  printers dye sublimation ink for digital inkjet printer Dye-sublimation printers use rolls of transparent film that are embedded with solid dyes. The film is heated to vaporize the dye, which then permeates the paper's surface and returns to solid form.

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5. Thermal wax printers Thermal Ribbons Thermal wax printers use a ribbon that passes in front of tiny heated pins that melt the wax from a ribbon onto the paper.

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6. Thermal auto chrome printers Thermal auto chrome printers use paper embedded with dye.

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Plotter A Plotter is sometimes confused with a printer, but a plotter uses line drawings to form an image instead of using dots.A common type of plotter is one that uses a pen or pencil. usually held by a mechanical “arm,” to draw lines on paper as images are typed. It may be a component that is added to a computer system or it may have its own internal computer.It can be used to create layouts, diagrams, specs, and banners.

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A hard disk drive (HDD; also hard drive, hard disk, or disk drive)[2] is a device for storing and retrieving digital information, primarily computer data. Hard Disk Drive It consists of one or more rigid (hence "hard") rapidly rotating discs (platters) coated with magnetic material, and with magnetic heads arranged to write data to the surfaces and read it from them.

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Magnetic tape is a medium for magnetic recording, made of a thin magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany, based on magnetic wire recording. Devices that record and play back audio and video using magnetic tape are tape recorders and video tape recorders. A device that stores computer data on magnetic tape is a tape drive (tape unit, streamer). MAGNETIC TAPE

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Compact Cassette 7-inch reel of ¼-inch-wide audio recording tape, typical of consumer use in the 1950s–70s. MAGNETIC TAPE

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FLOPPY DISK A floppy disk, or diskette, is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. They are read and written by a floppy disk drive (FDD). Floppy disks, initially as 8-inch (200 mm) media and later in 5.25-inch (133 mm) and 3.5-inch (89 mm) sizes, were a ubiquitous form of data storage and exchange from the mid-1970s well into the first decade of the 21st century.

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8-inch, 5 1⁄4-inch, and 3 1⁄2-inch floppy disks with respective drives

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n 1971, IBM introduced the 8-inch floppy disk, initial capacity was about 100K bytes (100,000 characters) In 1980, Sony introduced the3 1/2-inch floppy disk. Initially holding about 400K, current capacity is 1.4Meg per disk. In 1984, the Apple Macintosh had an internal 3 1/2-inchfloppy drive capable of storing 400K of data.

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An optical disc (OD) is a flat, usually circular disc which encodes binary data (bits) in the form of pits (binary value of 0 or off, due to lack of reflection when read) and lands (binary value of 1 or on, due to a reflection when read) on a special material ( often aluminium )on one of its flat surfaces OPTICAL DISK

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The end

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