 Input Devices Input Devices  Output Devices Output Devices  BIOS BIOS  Input Input  Output Output  Storage Devices Storage Devices  Sequential vs. Random Access Storage Sequential vs. Random Access Storage  Storage Technologies: Magnetic and Optical Storage Technologies: Magnetic and Optical

 An input device is any hardware component that allows you to enter data and instructions onto a computer. Six Widely used input devices are the keyboard, mouse, microphone, scanner, digital camera and PC video camera. back

 An output device is any hardware component that conveys information to one or more people. Three commonly used output devices are a printer, a monitor and speakers. back

 Acronym for basic input/output system, the built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.softwarecomputer programsdiskPCscodekeyboarddisplay screendisk drives serialcommunications functions back

 Input is any data entered into the computer’s memory.  Types of input include: ◦ Data – Unorganized information (words, numbers, images, or sounds) that the computer converts to meaningful information ◦ Software – Programs transferred from storage devices to the computer’s memory ◦ Commands – Instructions that tell the computer what to do ◦ Responses – Prompts requiring user feedback

Input device captures information and translates it into a form that can be processed and used by other parts of your computer.  Keyboards  Pointing devices  Game controllers  Scanners  Styluses  Microphones  Digital cameras  Web cams p Fig. 5-1  SimNet Concepts Support CD: “Overview of Input Devices” and “Other Everyday Input Devices” back

What is Output? Output is data that has been processed into a useful form.

Output devices Monitors: screens or Visual Display Units (VDUs) display the effects of what the user is doing can vary in size and resolution. Printers: produce a paper copy of the user’s work: a ‘hard copy’ come in three main types: laser, inkjet and dot matrix. Some businesses also use plotters. Sometimes we just need to see the information, on screen or on paper, so we use a monitor or a printer.

DeviceBenefits CRTCheapest monitor to buy; gives a sharp picture LCDSlim screen; Used for laptops and digital display TFTSlim screen; quick to refresh because each pixel has its own transistor SpeakersGood for loud music; can address a whole room HeadphonesCan listen without disturbing others; good for private conversation LaserQuick and best quality printer; large paper tray InkjetCheap colour printing; good for printing photos Dot matrixImpact printer; good for multi-part forms PlotterLarge drawing size; clear lines for technical drawings ControlSafe in all conditions; good for repetitive tasks back

 Storage devices are categorized by: ◦ The type of operations they perform ◦ The method they use to access the information ◦ The technology they use ◦ Their location in the storage hierarchy ◦ Their capacity and speed back

 Sequential – Storage devices that read and write data in a serial (one after the other) fashion  Random-Access – Storage devices that read and write data without going through a sequence of locations Tape Drive – sequential storage Hard Disk – random-access storage Floppy Disk Drive – random-access storage back

 Magnetic – Storage devices use disks or tapes that are coated with magnetically sensitive material  Optical – Storage devices that use laser beams to read patterns etched into plastic disks Magnetic Storage Optical Storage – CD/DVD drive back

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