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 computers 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 computers 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. 5.130 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 users 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