ICT Q4 MIDTERMS

• Operating System (OS)


  The software that supports a computer's basic functions, such as scheduling tasks, executing applications, and controlling peripherals
• Four Basic Functions of OS

  • Control hardware access
  • Manage files and folders
  • User interface
  • Application management
• Four OS Concept

  • Multiuser
  • Multitasking
  • Multiprocessing
  • Multithreading
• Device driver


  A small program that enables communication between an operating system or application and hardware or peripheral devices
• MANAGE FILES AND FOLDERS


  • Created by the operating system to allow data to be stored, made up of numerous program and data files usually grouped together by program, in a directory or in folders
• Types of User Interfaces

  • Command-Line Interface
  • Graphic User Interface
• Application Programming Interface (API)


  A set of guidelines that ensures an application is compatible with an operating system
• APIs

  • Open Graphics Library (OpenGL)
  • DirectX
• Windows 7 Starter


  A 32-bit version designed to serve most basic computer needs
• Windows 7 Home Premium


  Consists of all features of Windows 7 Home Basic OS along with a few additional features
• Ubuntu 14.10 (Utopic Unicorn)


  A Debian-based Linux operating system
• Red Hat Enterprise Linux


  An open-source Linux operating system
• Common Modes of Operation

  • Real Mode
  • Protected Mode
  • Virtual Real Mode
  • Compatibility Mode
• Real Mode


  Capable of executing one program or application and addressing 1MB of system data at a time
• Protected Mode


  Capable of accessing the entire memory of the computer including the virtual memory, and managing multiple applications simultaneously. Used in 32-bit OS.
• Virtual Real Mode


  Capable of recreating the environment of previous operating systems for applications that are not compatible with the current operating system used
• Compatibility Mode


  Capable of running a real-mode application in a protected mode operating system
• control hardware access - the management of interaction between an application and hardware device. it should require hardware device driver to work
• device driver - serves as a bridge
• manage files and folders - located in a hard disk drive. made of numerous program. may consists of subfolders
• user interface - allows user to interact with both software and hardware
• command line interface - user interact with the computer using series of command
• graphic user interface - user interacts through menus, buttons, and icons
• application management - located and loaded into the RAM.
• open graphics library - cross platform designed for multimedia graphics
• directx - library of APIs that are related to multimedia tasks
• multiuser - having one or more user who can access the program and files on a single computer
• multitasking - operating multiple application simultaneously
• multiprocessing - having multiple processors that application can share
• multithreading - multitasking in individual programs