Chapter 5

• System Unit/System chassis


  Is a container that houses most of the electronic components that make up a computer
• System board/Mainboard/Motherboard


  >communication medium for entire computer >Every component of the System Unit connect here >Acts as data allowing various components to communicate with one another >Sockets & Slots & Bus Lines
• Sockets


  Provide a connection point for small specialized electronic parts called chips
• Slots


  Provide a connection point for specialized cards or circuit boards
• Bus Lines 


  Provides a pathway that supports communication among various electronic components that are either located on the system board or attached to the system board
• Image of System Board

  
• Microprocessor


  >the central Processing Unit(CPU)/processor is contained on a single chip >The brains of the system >Control Unit & Arithmetic-logic Unit
• Control Unit


  Tells the rest of the computer system how to carry out a program's instructions
• Arithmetic-logic Unit


  Preforms arithmetic and logical operations
• Memory


  >Is a holding area for data instructions & information >Like Microprocessors,Memory is contained on chips >Random Access Memory(RAM) >Read Only Memory(ROM) >Flash Memory
• Memory Types

  
• Expansion Cards

  Graphics cards & Network interface cards or Network adaptor cards & Wireless network cards.

  
• Bus Lines

  >Connects the part of the CPU to each other >System Buses >Expansion Buses
• System Buses


  Connects the CPU to memory on the board
• Expansion buses


  Connects the CPU to other components on the system board, including expansion slots
• Ports


  >Is a socket for external devices to connect to the system unit >Standard Ports >Specialized Ports
• Standard ports 


  >USB – Universal Serial Bus >HDMI – High Definition Multimedia Interface >Thunderbolt >Ethernet
• Specialized ports


  >External Serial Advanced Technology Attachment (eSATA) >Musical instrument digital interface (MIDI) >Mini DisplayPort (MiniDP or mDP) >VGA (Video Graphics Adapter) and DVI (Digital Video Interface) >FireWire
• Example of Ports

  
• Cables are used to connect external devices to the system unit via ports

  
• Power supply


  >Computers require direct current (DC) to power the electronic components. >A standard wall outlet provides alternative current (AC).

  >The power supply converts AC to DC.

  >Desktop computer – Power supply unit, located within the system unit.

  >Laptop computers & tablets – AC adapters, located outside the system unit
• Power supply examples