Computer Hardware
An IRQ allow interface cards to:

Pass data to the CPU to be processed
Pass data to the computers memory
Interrupt the CPU to request service
Pass data from one card to another

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Computer Hardware
One of the major components of a PC is the Central Processing Unit (CPU) which can be best described as:

The area where ail the of the Basic input/output routines are stored
The area where all of the processing takes place
The device that sends the monitor signals telling it what to display
The area that regulates all of the system power usage

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