Inside the computer

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Inside the computer

  1. 1. A simple model of the computer Main Memory Input Output Processor Devices Devices Backing Storage
  2. 2. The Processor Arithmetic and Logic Unit (ALU) Carries out calculations e.g. 10110011 + 11110010 ALU
  3. 3. The Processor Control Unit Decodes and executes instructions Manages flow of information around CPU Control ALU Unit
  4. 4. The Processor Registers Small number of very fast temporary Register Register storage locations which hold data Register Register Control ALU Unit
  5. 5. The Processor and MemoryA processor looks like this
  6. 6. The Processor and MemoryA processor looks like this and memory (RAM) looks like this
  7. 7. The Processor and Memory Processor speed is measured in Megahertz (MHz) A typical processor will have a speed of between 2 and 3.6 MHz BUT some computers have more than one processor
  8. 8. The Processor and Memory Processor speed is measured in Megahertz (MHz) A typical processor will have a speed of between 2 and 3.6 MHz BUT some computers have more than one processor RAM is measured in Gigabytes (GB) A typical computer will come with between 2GB and 8GB of RAM
  9. 9. Memory (RAM) Address Main Memory 1 11110011 2 00011010 3 10101101 4 00110011 5 11100000 6 7 8 9 10Large number of storage locations which hold data and programsEach location has it’s own unique address
  10. 10. Memory (RAM) Address Main Memory 1 2 3 4 5 6 7 8 9 10Known as RAM (Random Access Memory)When the computer is switched off, RAM is cleared
  11. 11. Processor and memory Main Memory ProcessorWhich is why we need...
  12. 12. Processor, memory and backing storage Main Memory Processor Backing Storage
  13. 13. Backing StorageThe most common form of backing storage is a hard disk drivewhich looks like this
  14. 14. Backing Storage The circular area of a hard disk (the platter) is made of magnetic material The storage space of a hard disk is measured in Gigabytes (GB) A typical computer system will come with 250GB – 1000GB of storage space
  15. 15. Backing Storage What other backing storage devices can you think of?
  16. 16. Backing Storage What other backing storage devices can you think of? Optical devices (CD-ROM / DVD-ROM) Memory cards USB Flash memory
  17. 17. ROMWe have seen that the computer’s memory is known as RAM which stands for:RandomAccessMemoryRAM is cleared when the computer is switched off.
  18. 18. ROMThe computer also has special memory called ROM. This stands for:ReadOnlyMemoryROM does not get cleared when the computer is switched offROM contains the programs which tell the computer what to do when it isswitched on
  19. 19. CreditsS2-3 Curriculum for Excellence – Inside the ComputerM. Cunningham, Forrester High School (2011)All images licenced under Creative Commons 3.0• Intel Insides by Ryan Maclean (rcmaclean on Flickr)• Hard Disk by Jeff Kubina

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