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In DMA (Direct Memory Access) data transfer, the data moves between the I/O device and the main memory

2114Medium DSSSB TGT Computer Science 0 replies 2 views
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In DMA (Direct Memory Access) data transfer, the data moves between the I/O device and the main memory

  • Athrough the CPU registers, word by word
  • Bwithout the CPU handling each word, under the control of the DMA controller
  • Conly through the cache memory
  • Donly when the CPU is switched off
Correct answer: B

Explanation

The DMA controller takes over the bus and transfers a block directly between the device and memory, freeing the CPU from handling every word.

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