hardware

  • Created by: cal14
  • Created on: 08-02-18 09:13
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  • hardware
    • system arcitecture
      • pc
        • program counter
          • holds the next instruction
      • mar
        • memory address register
          • holds the address where the data is
      • acc
        • accumilatour
          • holds the results of calculations
      • mdr
        • memory data register
          • holds data from the memory
      • alu
        • arithmetic logic unit
          • performes calculations
      • cpu
        • has to fetch decode and execute instructions
      • cache
        • holds fragrantly used instructions
      • cpu speed
        • cache size
          • how big the cahce is affects speed
        • number of cores
          • how many sets of the parts CPU  it has
        • clock speed
          • how many instructions are done per second
    • memory
      • rom
        • reads only memory
          • non volitile
          • read only
          • holds bios and bootstrap used in embedded systems
      • ram
        • random acsess memory
          • volitile
          • read and wright
          • holds os programs and data in use by the cpu
      • flash
        • non volitile
        • read and write
        • used as secondary storage in desktops and phones
      • virtual memory
        • this is space on a hard disk that is used as ram it is then transferred back to ram when it is being used
    • storage
      • magnetic
        • hard disk drive (hdd)
          • medium speed
          • large capacity
          • unlimited read write cycle
        • tape
          • slow
          • very large capacity
          • unlimited life span
      • solid state
        • secure disk(sdcard)
          • slow
          • small -mid capacity
          • small size
          • cheap per gb
        • ssd(solid state drive)
          • fast
          • expensive per gb
          • limited read write cycles
          • mid - large size
      • optical
        • cd
          • slow
          • small capacity
          • medium size
          • cheap
        • dvd
          • slow
          • cheap per gb
          • easy to break
          • small
        • blue ray
          • cheap per gb
          • slow
          • medium capacity

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