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
After displaying the directory of a floppy disk, a different floppy is inserted into the drive. The contents of the original floppy continue to display regardless of the director requests on the other floppies placed in the drive. You remove the drive in question and install it into your test system, and it does not exhibit the problem. You should next replace the:

System's floppy drive device driver
System's power supply
Original IDE controller
Floppy drive ribbon cable
None of these

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