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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.
The advantage of using DMA is that the DMAC performs the data transfer. The CPU is not tied up for the entire duration of the transfer; however it must still program the DMAC. In general DMA is faster than programmed I/O and therefore useful for large data transfers. IRQ stands for interrupt request. Interrupts are used to perform automatic serial polling and to implement asynchronous (background) data transfers.