Which scheme needs special hardware to get data coming from I/O devices?
Correct answer: A. DMA (Direct Memory Access)
- A. DMA (Direct Memory Access)
- B. Interrupt
- C. I/O operations
- D. Scheduling
Explanation
DMA (Direct Memory Access) is a technique that allows data transfer between an input/output (I/O) device and memory without involving the central processing unit (CPU) as much. This improves overall system performance because the CPU can continue processing other instructions while the data transfer is happening. DMA requires a special hardware component called a DMA controller (DMAC) to manage the data transfer process. So, option (a) is correct. In conclusion, DMA is the scheme that requires special hardware to get data coming from I/O devices. It uses a DMA controller to manage data transfer directly between memory and I/O devices, reducing CPU involvement.
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Hardware includes the physical components of a computer, such as the CPU, motherboard, registers, memory, storage devices and peripheral equipment. Software covers system software, application software, utilities, drivers and firmware, with attention to how the operating system manages hardware and how software differs from the physical equipment it controls.
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