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Computer Science · Oct / Nov 2025 · Paper 12 · Question 5

0478

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The question as text

A computer system has a mouse. An interrupt is sent to the CPU every time a button on the mouse is clicked.

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  • 5(a)[1]

    Hardware (interrupt)

  • 5(b)[4]

    Any four from:

    Checks the priority of the interrupt
    If priority is higher, it halts the current process
    … stores it on a stack
    … fetches the interrupt
    … checks the source of the interrupt
    … calls the interrupt service routine (ISR) / interrupt handler to process the interrupt
    If priority is not higher, it continues with current process

  • 5(c)(i)[2]

    It is sent one bit at a time
    It is sent down a single wire

  • 5(c)(ii)[2]

    Any two from:

    The mouse can be powered by the device
    It is a universal connection
    It is backward compatible
    Less chance of skewing // Less chance of errors
    Supports different data transmission speeds
    Adequate transmission speeds
    The cable cannot be inserted incorrectly
    The device is automatically detected // Driver is automatically installed when device is connected

  • 5(c)(iii)[1]

    Any one from:

    Slower transmission than a parallel connection
    Wire may get in the way // wire may limit movement of mouse
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