pm2

• Acer


  Hardware components
• Output devices


  • Monitors
  • Printers
• Monitors


  • Primary output device where we see the processed output
  • Made up of tiny elements called pixels
  • Each row of pixels is called a SCAN LINE
• Resolution


  A measurement of the number of pixels that can be contained on a display screen
• Resolution

  • 640 x 480 is low resolution
  • 1600 x 1200 is high resolution
• Dot pitch


  .49 (not very good)<|>.28 (much better)<|>.26 or lower (excellent)
• Types of printers

  • Dot Matrix
  • Ink Jet
  • Laser
• Dot Matrix


  • Uses ribbon and hammer technology, strike pins against ribbon to print
• Ink Jet


  • Creates digital image by propelling droplets of ink onto the paper
• Laser


  • Uses laser technology to print documents, it produces high-quality printing at high speeds
• Primary memory


  The memory in the computer used to store information currently being processed within the CPU
• RAM


  Short term storage for open programs, takes data from the CPU so it can handle processing needs
• ROM


  Used to store start up instructions
• Secondary memory/Auxiliary storage


  Physical devices used to store programs or data on a temporary or permanent basis
• Ports


  Hardware that allows a computer to connect to other devices, including accessories, peripheral devices, and other computers
• Types of ports

  • Audio and video ports
  • Network ports
  • USB ports
• Software


  The set of programs used for different purposes, all programs used in a computer to perform specific tasks
• Types of software

  • System software
  • Applications software
  • Utility software
• System software


  Programs designed to run a computer's hardware and applications and manage its resources
• Operating system


  The most important software that runs on a computer, the interface between computer and user, manages the computer's memory, processes, software and hardware
• Operating systems

  • Windows
  • macOS
  • Linux
  • Android
  • iOS
• Application software


  Computer programs that perform specific personal, educational, and business functions
• Utility software


  Helps maintain the proper and smooth functioning of a computer system, assists the operating system to manage, organize, maintain, and optimize the functioning of the computer system
• Commercial software


  Any program designed and developed for licensing or sale to end users or that serves a commercial purpose, licensed to users at a fee under an agreement to protect the business and preserve the rights of the developer
• Types of commercial software licenses

  • Single-user license
  • Volume license
  • Perpetual license
  • Subscription or annual license
  • Floating concurrent license
• Software virus


  Illegal code added to a program, can self-replicate and spread onto other devices
• Ways software viruses can spread

  • Copying files from one computer to another
  • Downloading files
  • Email attachments