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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.
What are DMA and IRQ and what are they used for in the context of GPIB? DMA stands for direct memory access. Personal computers have DMA controllers (DMAC) that are used to transfer data directly to or from a device and the computer's memory. National Instruments GPIB products are designed to program the DMAC to transfer data to and from memory.