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March 31, 2015. 1  An IRQ (Interrupt Request) number is assigned to all the hardware devices installed in a computer that are used to input information, for example the mouse or the keyboard. On a PC, some IRQs are predefined, so the Keyboard controller is always given an IRQ of 1, for example.
This is a duplication of the IRQ and therefore a conflict. Because of this, it is important to be careful when adding new hardware devices (like modem cards, network cards, sound cards, emulation cards). Some of these hardware devices have jumpers to configure the IRQ or COM port to another setting.