Computer Hardware
An IRQ allow interface cards to:

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

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Computer Hardware
A brownout is defined as:

has nothing to do with electricity
a slightly elevated voltage lasting from seconds to minutes or more
complete power out lasting a few minutes
alternating power out, power on lasting a few minutes
a slightly decreased voltage lasting from seconds to minutes or more

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