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Many processes appear to run simultaneously
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Data are temporarily held in a buffer waiting for an output device to access it
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A signal that causes the operating system to take a specified action
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A program that performs a specific task required for the operation of a computer system
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The table shows a segment of primary Memory from a Von Neumman model computer.
(a) (i) State the data that will be placed in the memory address register (MAR)
(ii) State the data that will be placed in the memory data register (MDR)
Register 1:
Register 2:
Register 3:
Bus 1:
Bus 2:
Bus 3:
This bus carries signals used to coordinate the computer's activities
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This bi-directional bus is used to exchange data between processor, memory & input/output devices
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This uni-directional bus carries signals relating to memory addressed between processor and memory
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Holds data and instructions when they are loaded from the main memory and are waiting to be processed
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Holds data temporarily that is currently being used in a calculation
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Holds data and instructions temporarily when they are being processed
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Manages the flow of data & interaction between the components of the processor
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Carries out calculations on data
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Pathway for transmitting data & instructions
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