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Computer Science · May / June 2024 · Paper 11 · Question 5

0478

As printed in the paper

The question as text

A computer uses both random access memory (RAM) and secondary storage.

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Show the answer and mark scheme

  • 5(a)[1]

    To store data/files/software permanently

  • 5(b)[3]

    Compact disk (CD)

    Digital versatile disk (DVD)

    Blu-ray disk

  • 5(c)[3]

    Any three from:

    To store data temporarily
    To store data currently in use
    To store software currently in use
    Data can be accessed faster (than secondary storage)
    To speed up the fetch stage (of the fetch-execute cycle)

  • 5(d)[4]

    Any four from:

    The diagram shows:

    The registers MAR, MDR and PC
    Address sent from PC to MAR
    …using address bus (award anywhere for correct use of address bus)
    …PC is incremented
    Address sent from MAR to RAM
    Data/instruction sent from RAM to MDR
    …using data bus (award anywhere for correct use of data bus)
    Data/instruction sent from MDR to CIR/CU
    Control unit sending control signal for any part of the process
    … using control bus (award anywhere for correct use of control bus)

    Example:

    PC sends address to

    MAR then increments

    The address is sent

    RAM

    Control

    from the MAR using

    PC

    unit

    the address bus

    MAR

    CIR

    MDR

    The instruction is

    sent to the MDR

    The instruction is

    using the data bus

    sent to the CIR to be

    decoded

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