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CompTIA Linux+ Certification Guide by Philip Inshanally

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Interrupts and devices

Now let's switch gears and look at the Interrupt Requests (IRQs) and devices that are available in our Linux system. You can think of an interrupt as a service hotline that we would use whenever we need a particular item. We would ring a service hotline. The theory remains the same for devices within a Linux system; whenever it requires the CPU's attention, it sends out signals via interrupts. Traditional 32-bit architectures support up to 16 interrupts: 0–15. Newer architectures support far more than 16 interrupts.

Let's take a look at the /proc directory once again, homing in on /proc/interrupts:

More interrupts are ...

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