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#2577474

The CPU can request data from an I/O controller, one byte at a time, but by doing so, it wastes a large chunk of the CPU. Another way of accomplishing the same work without this waste is:

  • By using a direct processor access without using any memory.
  • By using an operating system interrupt control.
  • By using a direct memory access, but only if the hardware has this controller.
  • By using the operating system scheduler.
  • By using the cache memory.
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