DOCSLIB.ORG

Input, Output & Storage

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Input, Output & Storage Computer Basics 1 Identify and describe the most common input devices Identify and describe the most common output devices Identify and describe storage devices Identify and describe how input and output devices are connected to the computer 2 However, it needs help! Input, which is the data or instructions, must be entered into the computer. After the data is entered and processed, it needs to be “presented” to the user. We have special devices for these tasks and refer to them as input and output devices. 3 •Input devices enable you to input data and commands into the computer. •Output devices enable the computer to give you the results for the processed data. •Some devices can perform both of these tasks. The fax machine and modems are examples of this, as both these devices send (output) and receive (input) data over communications media. 4 Input devices enable you to input data and commands into the computer. The type of input device used is determined by the task to be completed. An input device can be as simple as the keyboard or as sophisticated as those used for specialized applications such as voice or retinal recognition. 5 • The Keyboard is the most commonly used input device for entering numeric and alphabetic data into the computer • A wide variety of computers are available: Ergonomic Wireless Specialized Security Flexible Biometric fingerprint reader 6 A pointing device is an input device that allows a user to position the pointer on the screen. The pointer can have several shapes, but the most common is an arrow. You can use the pointing device to select objects, click buttons, icons, menu items and links. 7 The mouse is the most commonly used pointing device for personal computers. It moves around on a flat surface and controls the pointer (arrow) on the computer screen. The mouse fits conveniently in the palm of your hand. There are four types of mice 8 This type of mouse has a ball located on the bottom that rolls on a flat surface as the mouse is moved. Sensors inside the mouse determines the direction and distance of movement. A mouse pad generally is used with a mechanical mouse. 9 This mouse is the same as the mechanical mouse, but uses optical sensors to detect motion of the ball. 10 An optical mouse uses a laser to detect the mouse’s movement. Optical mice have no mechanical moving parts. They respond more quickly and precisely than mechanical and optomechanical mice. 11 A wireless mouse is a battery- powered device that relies on infrared or radio waves to communicate with the computer. 12 You will use the left button for mouse operations. Generally, clicking the right button displays the context window. The type of actions will depend on the program you are currently using. 13 Pointing: placing the on-screen pointer at a designated location Clicking: pressing and releasing the mouse button to select a specific location within a document Dragging: pressing down the mouse button and moving while continuing to hold down the button to highlight a selected portion of text Double-clicking: pressing and releasing the mouse button two times in rapid successions to select a word 14 Triple-clicking: pressing and releasing the mouse button three times in rapid succession to select a paragraph Right-clicking: pressing the right mouse button to display a menu Rotate wheel: rotating wheel on the mouse forward or backward to scroll vertically through a document screen Tilt wheel: pressing the mouse’s rotate wheel right or left to scroll horizontally 15 The trackball is a pointing device that works like a mouse turned upside down, as the ball is on the top of the device. Trackballs You use your thumb or fingers to operate the ball, thus controlling the pointer on the screen. 16 The joystick is also pointing devices mainly used in games. The joystick consists of plastic or metal rod mounted on a base. You can move the rod in any directions. Some joysticks have switches or buttons that can input data in an on/off response. 17 The wheel is a steering- wheel type of pointing device used to simulate driving a vehicle. Most wheels also include foot pedals used for braking and acceleration actions. 18 Pointing Stick A pointing stick is a pressure-sensitive device that looks like a pencil eraser. It is locate on the keyboard, generally between the G, H and B keys. It is moved with the forefinger, while the thumb is used to press related keys. 19 There are a variety of other input devices available, most of which are used for special application. 20 Graphic Tablet, also called a digitizing tablet, is a flat drawing surface on which the user can draw figures or write something freehand. Touch Display Screen is a special screen with pictures or shapes. You use your fingers to “point” to the desired object to make a selection 21 Stylus and digital pen are pen-like writing instruments. These devices allow the user to input information by writing on a PDA or other mobile device or to use the pen as a pointer. 22 Audio Input is the process of inputting sound into the computer. This could include speech, sound effects and music. Audio Input includes microphones, CD/DVD players, radios, and other devices such as electronic keyboards. 23 Voice input is a category of audio input. Voice recognition devices are used to “speak” commands into the computer and to enter text. The computer must have some type of voice recognition software installed. 24 Touchpad is a device commonly used on laptop computers. To move the pointer, you slide your fingertips across the surface of the pad. To imitate the mouse operations, clicking, tap or double-tap the surface of the touchpad. 25 A scanner is a device that can change images into codes for input into the computer. Scanners come in a variety of sizes, shapes and types, including the following: 26 Image Scanners convert images into an electronic form that can be stored in a computer’s memory. The image can then be manipulated. Bar Code Scanners read bar lines that are printed on products in a store. 27 These devices read coded information on the back of credit cards. The magnetic strip on the back of the cards contains the encoded user’s account number. 28 These devices use a light source to read characters, marks, and Optical codes. Scanner The data is converted into digital data. Banks use OCR technology to scan checks. Bluetooth OMR can be used for Scanner testing purposes. 29 The pictures taken with a digital camera are stored digitally and then transferred to the computer’s memory. Digital cameras use a variety of mobile storage media to store the images including: • Flash Memory Card • Memory Stick • USB • Mini-disc 30 Consists of solid-state storage devices. After the pictures are transferred to the computer, they can be viewed quickly and any imperfections can be edited with photo- editing software. 31 Video Input is the process of capturing full-motion images with a type of video camera and then saving the video on a storage medium such as a hard drive, CD or DVD. After the video is saved, you can view and edit it. 32 A digital video (DV) camera records video as digital signals: some cameras also capture still images. Some are just a little larger than a credit card. 33 The PC Video Camera is a type of digital cameras that allows the user to send live images over the Internet, make video telephone calls, and send e-mail messages with video attachments. 34 A Web camera, or Webcam is a real-time camera that displays images through the World Wide Web. The camera may be built into your monitor, or you can attach one an existing monitor. 35 Biometrics is an authentication technique using automated methods of recognizing a person based on a physiological or behavioral characteristics. Biometric devices consist of a reader or scanning device, and software that converts scanned information into a digital format. The scanned information is then compared to a database of stored biometric data. 36 Some of the more common types of recognition are: Fingerprint Face Handwriting Voice 37 Retina (analysis of the capillary vessels located at the back of an eye) Hand Geometry (analysis of the shape of the hand and length of the fingers) Vein (analysis of the pattern of veins on the back of the hand and the wrist) 38 Enrollment: The user enrolls in the system by establishing a baseline measurement for comparison. Submission: The user presents biological proof of his or her identity to the capture system. Verification: The system compares the submitter sample with the stored sample. 39 Privacy and civil liberties advocates ‘s are concerned about the widespread adoption of biometric systems. • Concerns that third parties can access the data without an individual’s consent • Eroding of an individual’s control over the uses of their information 40 Several companies now offer biometric computer keyboards and USB flash drives with fingerprint authentication that can be used for personal applications. 41 Visual Devices uses the synchronized position of light emitting and sensing devices to detect user impact. Virtual Piano Keyboard Virtual computer keyboard 42 The Touch-Sensitive Pad on a portable device, such as an iPod, enables the user to scroll through and adjust the volume, play music, view videos or pictures, and customize settings. 43 As data is entered in the computer and processed, it is stored in RAM (temporary memory).
Load more

Recommended publications
  • A275 User Guide
    A275 User Guide Note: Before using this information and the product it supports, ensure that you read and understand the following: • Safety and Warranty Guide • Setup Guide • “Important safety information” on page v Lenovo® makes constant improvement on the documentation of your computer, including this User Guide. To get all the latest documents, go to: https://support.lenovo.com Second Edition (February 2018) © Copyright Lenovo 2017, 2018. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS- 35F-05925. Contents Important safety information . v Using the ThinkPad pointing device . 20 Read this first. v ThinkPad pointing device overview . 20 Important information about using your computer . v Using the TrackPoint pointing device. 21 Conditions that require immediate action . vii Using the trackpad. 22 Service and upgrades . viii Using the trackpad touch gestures . 23 Power cords and power adapters . ix Customizing the ThinkPad pointing device . 24 Extension cords and related devices. ix Replacing the cap on the pointing stick . 24 Plugs and outlets . x Power management . 25 Power supply statement . x Using the ac power adapter . 25 External devices . xi Using the battery . 25 General battery notice . xi Managing the battery power . 27 Notice for removable rechargeable battery . xi Power-saving modes . 27 Notice for built-in rechargeable battery. xii Cabled Ethernet connections . 28 Notice for non-rechargeable coin-cell battery . xii Wireless connections . 28 Heat and product ventilation . xiii Using the wireless-LAN connection . 28 Electrical current safety information .
    [Show full text]
  • Siouxland Fabricating Inc.: Windows USB Devices List All Detected USB Devices (56 Items) Generated on Oct 02, 2014 @ 08:28 Am
    Siouxland Fabricating Inc.: Windows USB Devices List all detected USB devices (56 items) Generated on Oct 02, 2014 @ 08:28 am Name Product Identifier Manufacturer Vendor Identifier Number of Instances Service 3Dconnexion Space Pilot 3D Mouse C625 Logitech, Inc. 046D 1 Input 3Dconnexion SpacePilot PRO C629 Logitech, Inc. 046D 1 Unknown (LGPBTDD) 3Dconnexion SpacePilot Pro 3D Mouse C629 Logitech, Inc. 046D 1 Input ActiveJet K-2024 Multimedia Keyboard 0103 Elan Microelectronics Corp. 04F3 1 Input ASIX AX88772 USB2.0 to Fast Ethernet Adapter 7720 ASIX Electronics Corp. 0B95 1 Unknown (AX88772) Audio Adapter 000C C-Media Electronics, Inc. 0D8C 1 Input Bar Code Scanner 1200 Symbol Technologies 05E0 9 Input Basic Optical Mouse v2.0 00CB Microsoft Corp. 045E 1 Input Benq X120 Internet Keyboard Pro 001C Darfon Electronics Corp. 0D62 2 Input C-Media USB Headphone Set 000C C-Media Electronics, Inc. 0D8C 1 Audio Comfort Curve Keyboard 2000 V1.0 00DD Microsoft Corp. 045E 1 Input Cordless Mouse Receiver C50E Logitech, Inc. 046D 2 Input Cordless Mouse Receiver C521 Logitech, Inc. 046D 1 Input Dell N889 Optical Mouse 4D81 Primax Electronics, Ltd 0461 1 Input Intel(R) Centrino(R) Wireless Bluetooth(R) 3.0 + High Speed Adapter 0189 Intel Corp. 8086 1 Bluetooth Keyboard 2003 Dell Computer Corp. 413C 3 Input Keyboard 2010 Dell Computer Corp. 413C 1 Input Keyboard K120 for Business C31C Logitech, Inc. 046D 1 Input Laptop Integrated Webcam 63E0 Microdia 0C45 1 Unknown (OEM13VID) Logitech Unifying USB receiver C52B Logitech, Inc. 046D 1 Unknown (LEQDUSB) M-BT96a Pilot Optical Mouse C03D Logitech, Inc. 046D 1 Input Microsoft USB Wheel Mouse Optical 0040 Microsoft Corp.
    [Show full text]
  • The How of Computers
    THE HOW OF COMPUTERS A computer is an electronic device, operating under the control of instructions stored in its own memory, that can accept data, process the data according to specified rules, produce results, and store the results for future use. Data and Information Computers process data into information. Data is a collection of unprocessed items, which can include text, numbers, images, audio, and video. Information conveys meaning and is useful to people. Many daily activities either involve the use of or depend on information from a computer. Computers process several data items to print information in the form of a cash register receipt. A computer processes data into information. In this simplified example, the item ordered, item price, quantity ordered, and amount received all represent data. The computer processes the data to produce the cash register receipt (information). Information Processing Cycle Computers process data (input) into information (output). Computers carry out processes using instructions, which are the steps that tell the computer how to perform a particular task. A collection of related instructions organized for a common purpose is referred to as software. A computer often holds data, information, and instructions in storage for future use. Some people refer to the series of input, process, output, and storage activities as the information processing cycle. Most computers today communicate with other computers. As a result, communications also has become an essential element of the information processing cycle. The Components of a Computer A computer contains many electric, electronic, and mechanical components known as hardware. These components include input devices, output devices, a system unit, storage devices, and communications devices.
    [Show full text]
  • Evaluating the Effect of Four Different Pointing Device Designs on Upper Extremity Posture and Muscle Activity During Mousing Tasks
    Applied Ergonomics 47 (2015) 259e264 Contents lists available at ScienceDirect Applied Ergonomics journal homepage: www.elsevier.com/locate/apergo Evaluating the effect of four different pointing device designs on upper extremity posture and muscle activity during mousing tasks * Michael Y.C. Lin a, Justin G. Young b, Jack T. Dennerlein a, c, a Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115, USA b Department of Industrial & Manufacturing Engineering, Kettering University, 1700 University Avenue, Flint, MI 48504, USA c Department of Physical Therapy, Movements, and Rehabilitation Sciences, Bouve College of Health Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA article info abstract Article history: The goal of this study was to evaluate the effect of different types of computer pointing devices and Received 10 January 2014 placements on posture and muscle activity of the hand and arm. A repeated measures laboratory study Accepted 3 October 2014 with 12 adults (6 females, 6 males) was conducted. Participants completed two mouse-intensive tasks Available online while using a conventional mouse, a trackball, a stand-alone touchpad, and a rollermouse. A motion analysis system and an electromyography system monitored right upper extremity postures and muscle Keywords: activity, respectively. The rollermouse condition was associated with a more neutral hand posture (lower Pointing device inter-fingertip spread and greater finger flexion) along with significantly lower forearm extensor muscle Computer tasks fi Musculoskeletal disorders activity. The touchpad and rollermouse, which were centrally located, were associated with signi cantly more neutral shoulder postures, reduced ulnar deviation, and lower forearm extensor muscle activities than other types of pointing devices.
    [Show full text]
  • INFORMATION SHEET 1.1.5 Storage, Input and Output Devices LEARNING OBJECTIVES
    INFORMATION SHEET 1.1.5 Storage, Input and Output Devices LEARNING OBJECTIVES: After reading this INFORMATION SHEET, STUDENT(S) MUST be able to: 1. identify the output and input device 2. explain, elaborate and classify the different computer peripherals and its components INTRODUCTION A peripheral is a piece of computer hardware that is added to a computer in order to expand its abilities. The term peripheral is used to describe those devices that are optional in nature, as opposed to hardware that is either demanded or always required in principle. There are all different kinds of peripherals you can add your computer. The main distinction among peripherals is the way they are connected to your computer. They can be connected internally or externally. A computer peripheral is any external device that provides either input or output. Peripherals typically fall into the hardware category and include optional system components. Computer peripherals are add-on hardware to the computer to expand its abilities or improve its performance. By adding memory, computers are able to perform a lot better, or by adding video cards, the computers graphics create more detail. These are just some of the peripherals, although there is a lot more you can put on your PC some of them may not be compatible. Compatibility maybe an issue to some of the peripherals and may even cause the worst outcome –the PC refuses to boot or the PC refuses to recognize the peripheral being added. The easiest way to solve that would be figuring out where it started and you can start from there.
    [Show full text]
  • Track Ball → It Is Pointing Device That Is Used to Control the Positions Of
    Department Of Computer Application (BBA) Dr. Rakesh Ranjan BCA Sem - 2 Input devices Track ball it is pointing device that is used to control the positions of the cursor on the screen. It is usually used in notebook computers where it is placed on the keyboard . It is nothing but an upside down mouse where the ball rotates in place within a socket. The user can rolls the ball to position the cursor at the appropriate position on the screen and then clicks one of the buttons near the track ball either to select the objects or to position the cursor. The working of a track ball is identical to mouse Touch pad it is small flat rectangular stationary pointing device with a sensitive surface of 1.5 to 2 inch. The user has to slide his or her figure tips across the surface of the pad to point to specific objects on the object. The surface translate the motion and position of the user’s figures to a relative position on the screen The touch pad are widely used in laptop and other handheld devices . The working of the touchpad is similar to that of mouse or a trackball. The pressure of the finger on the surface leads to a capacitance effect, which is detected by the sensors . the sensors send appropriate signals to cpu which interprets them and display the pointer on the screen . Joy stick it is widely used in computer games and computer aided design and manufacturing (CAD/CAM) applications. It has one or more push buttons called switches .
    [Show full text]
  • Evo Notebook N600c Series
    229045-002.book Page 1 Friday, September 21, 2001 11:16 AM b Hardware Guide Evo Notebook N600c Series Document Part Number: 229045-002 November 2001 This guide identifies computer hardware features and provides procedures for using them. It also includes instructions for setting up the computer, information about connecting external devices, and computer specifications. 229045-002.book Page 2 Friday, September 21, 2001 11:16 AM © 2001 Compaq Computer Corporation Compaq and the Compaq logo Registered in U. S. Patent and Trademark Office. Evo is a trademark of Compaq Information Technologies Group, L.P. Microsoft, MS-DOS, Windows, Windows NT are trademarks of Microsoft Corporation. All other product names mentioned herein may be trademarks of their respective companies. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is provided “as is” without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty. Hardware Guide Second Edition November 2001 First Edition June 2001 Document Part Number: 229045-002 229045-002.book Page iii Friday, September 21, 2001 11:16 AM Contents 1 Hardware and Software Setup Setting Up the Hardware. 1–1 Setting Up the Software . 1–4 Installing Optional Applications. 1–4 After Software Setup . 1–5 2 A Look at the Computer Display Components . 2–1 Pointing Device Components (Pointing Stick Models) . 2–2 Pointing Device Components (TouchPad Models). 2–3 Pointing Device Components (Dual Models) .
    [Show full text]
  • An Isometric Joystick As a Pointing Device for Handheld Information Terminals
    An Isometric Joystick as a Pointing Device for Handheld Information Terminals Miika Silfverberg I. Scott MacKenzie Tatu Kauppinen Usability Group Department of Computer Science Usability Group Nokia Research Center, Finland York University, Canada Nokia Research Center, Finland Abstract embedded pointing device that is suitable for handheld Meeting the increasing demand for desktop-like appli- use. This work studies the applicability of the isometric cations on mobile products requires powerful interac- joystick to handheld usage. tion techniques. One candidate is GUI-style point-and- click interaction using an integrated pointing device 1.1 Isometric Joystick that supports handheld use. We tested an isometric joy- A joystick is a good candidate for handheld pointing. stick for this purpose. Two prototypes were built. They Since it is mounted in the device chassis, it cannot be were designed for thumb operation and included a sepa- lost, unlike a stylus. It is small and can be manipulated rate selection button. Twelve participants performed potentially with the same hand that holds the device. point-and-select tasks. We tested both one-handed and two-handed interaction, and selection using the separate The device studied herein is an isometric joystick. The selection button and the joystick’s integrated press-to- pointer is moved by applying force to the stick. The select feature. A notebook configuration served as a stick itself doesn't move, or moves very little – hence reference. Results for the handheld conditions, both the name "isometric". The most common input-output one-handed and two-handed, were just slightly off those mapping is known as “velocity-control”, whereby the for the notebook condition, suggesting that an isometric applied force controls the velocity of the pointer.
    [Show full text]
  • Thinkpad E570, E570c, and E575 User Guide
    ThinkPad E570, E570c, and E575 User Guide Note: Before using this information and the product it supports, be sure to read and understand the following: • Safety, Warranty, and Setup Guide • “Important safety information” on page v The latest Safety, Warranty, and Setup Guide and the Regulatory Notice are available on the Lenovo Support Web site at: http://www.lenovo.com/support Fifth Edition (September 2017) © Copyright Lenovo 2016, 2017. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS- 35F-05925. Contents Important safety information . v Using the TrackPoint pointing device. 19 Read this first. v Using the trackpad. 20 Important information about using your computer . v Using the trackpad touch gestures . 21 Conditions that require immediate action . vii Customizing the ThinkPad pointing device . 22 Service and upgrades . viii Replacing the cap on the pointing stick . 22 Power cords and power adapters . ix Power management . 23 Extension cords and related devices. ix Using the ac power adapter . 23 Plugs and outlets . x Using the battery . 23 Power supply statement . x Managing the battery power . 25 External devices . xi Power-saving modes . 25 General battery notice . xi Cabled Ethernet connections . 26 Notice for removable rechargeable battery . xi Using the wireless-LAN connection . 26 Notice for non-rechargeable coin-cell battery . xii Wireless connections . 27 Heat and product ventilation . xiii Using the Bluetooth connection. 27 Electrical current safety information . xiv Using the Airplane mode . 27 Laser safety information . xv Using the NVIDIA Optimus Graphics feature.
    [Show full text]
  • The Keyboard and Mouse Are Examples Of
    The Keyboard And Mouse Are Examples Of Atypical Ram dispelling his sikas overqualified unequivocally. Inhumed and epideictic Irwin still reinterred his storax first-hand. Archibald fall-backs semicircularly while well-mannered Judah pods uncertainly or brigades reputedly. Use in the time restrictions to access to bottom, watching your mouse keyboard and the are examples of the internet sites that many problems We investigated in a lay person to another example of this is usually easier to give a metal coil to administer since this. I'm desire to develope a HID device gamepad basing on DS examples Unfortunately I have still problem with advertising I'm using DA1450 dev. It cannot enter. Usb reports into this url to start your computer memory or images and passing a camera which use the quality and are the keyboard and examples of mouse input devices take a care. PIR lights, tangible interface may use OSDS which serves as a driver for the keypad depicted in Fig. Most hp products have code usually blue or number. Solved Devices 1 A Keyboard And Mouse Are Examples Of. This is an description of all interface reports so the host can know what to expect. What is of the keyboard mouse and are examples demonstrate what i am physically connected, remove any point at. We use cookies to first you a smart experience. Including keyboard mouse touch pad single supplement and. What are examples. North america is global: which considerable reservations are in and the keyboard are examples of mouse attached and nasa tlx score of mouse a menu by simplifying and a quarterly newspaper that employ a player continuously strafing while stm act in! These are operated by a computer and more.
    [Show full text]
  • Thinkpad T495s Setup Manual
    T495s Setup Guide Guide de configuration Einrichtungsanleitung Guida di configurazione Installatiegids Manual de Configuração Unpack xxxxxxxxx I xxxxxxxxx I xxxxxxxxxx I xxxxxxxxx I xxxxxxxxxxx I xxxxxxxxxxx * ThinkPad Ethernet * Lenovo HDMI to VGA * Lenovo USB-C to Extension Adapter Adapter DisplayPort Adapter Gen 2 * Lenovo USB-C to VGA Adapter * For selected models I 某些型号配备 I 選配 I 一部のモデルで Initial Setup Configuration initiale I Ersteinrichtung I Configurazione iniziale I Eerste installatie I Configuração inicial Overview Présentation I I Überblick I Panoramica I Overzicht I Descrição geral 3 1 2 3 3 2 34 5 6 7 20 8 19 18 17 9 16 HDMI 15 14 10 13 11 12 * 1. Infrared camera * 11. Smart card slot * 2. ThinkShutter 12. Nano-SIM-card and microSD-card * 3. Microphones slot * 4. Camera 13. Trackpad * 5. Multi-touch screen 14. TrackPoint® buttons 6. Power button 15. Audio connector 7. Security-lock slot 16. HDMI™ connector 8. Always On USB 3.1 connector 17. USB 3.1 connector Gen 2 Gen 1 18. Docking station connector 9. TrackPoint pointing stick 19. Ethernet extension connector Gen 2 * 10. Fingerprint reader 20. USB-C™ connector (USB 3.1 Gen 2) * For selected models Read the statement on USB transfer rate in the User Guide. Refer to the Safety and Warranty Guide for accessing the User Guide. * 1. Infrared camera * 11. Smart card slot * 2. ThinkShutter 12. Nano-SIM-card and microSD-card * 3. Microphones slot * 4. Camera 13. Trackpad * 5. Multi-touch screen 14. TrackPoint® buttons 6. Power button 15. Audio connector 7. Security-lock slot 16.
    [Show full text]
  • Computer Input Devices
    COMPUTER - INPUT DEVICES http://www.tuto rialspo int.co m/co mputer_fundamentals/co mputer_input_devices.htm Copyrig ht © tutorialspoint.com Following are few of the important input devices which are used in Computer Systems Keyboard Mouse Joy Stick Lig ht pen Track Ball Scanner Graphic Tablet Microphone Mag netic Ink Card Reader(MICR) Optical Character Reader(OCR) Bar Code Reader Optical Mark Reader Keyboard Most common and very popular input device is keyboard. The keyboard helps in inputting the data to the computer.The layout of the keyboard is like that of traditional typewriter, althoug h there are some additional keys provided for performing some additional functions. Keyboard are of two sizes 84 keys or 101/102 keys, but now 104 keys or 108 keys keyboard is also available for Windows and Internet. The keys are following Sr. Keys Description No. 1 Typing Keys These keys include the letter keys (A-Z) and dig its keys (0-9) which are g enerally g ive same layout as that of typewriters. 2 Numeric Keypad It is used to enter numeric data or cursor movement. Generally, it consists of a set of 17 keys that are laid out in the same config uration used by most adding machine and calculators. 3 Function Keys The twelve functions keys are present on the keyboard. These are arrang ed in a row along the top of the keyboard.Each function key has unique meaning and is used for some specific purpose. 4 Control keys These keys provides cursor and screen control. It includes four directional arrow key.Control keys also include Home, End,Insert, Delete, Pag e Up, Pag e Down, Control(Ctrl), Alternate(Alt), Escape(Esc).
    [Show full text]