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Answer for Chapter 40'A' level Computing 4th EDITIONP.M. Heathcothe

Exercises for Chapter 40:
Processing and Programming Techniques


Name one register involved in the fetch part of the fetch-execute cycle.

The MAR (Memory Address Register) this holds the address of the memory location from which data will be read or to which data will be written.

Describe briefly what is meant by an interrupt.

An interrupt is a signal from some device or source seeking the attention of the processor

Give four different types of the event that may cause an interrupt

I/O interrupts – These are initiated by the I/O hardware and signal to the CPU that the status of a channel or device is changed.

Timer interrupts – These are generated by a timer within the processor, and allow the OS to perform certain functions at regular ...

Posted by: Carmen hershman

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