Memory- mapped I/O and direct I/O differ in that memory- mapped I/O stores data in memory before transferring it in or out of the computer.

Question

Quizplus · Accepted Answer

Memory-mapped I/O and direct I/O differ primarily in how they are accessed and controlled by the system, not in whether data is stored in memory before transferring. Memory-mapped I/O treats peripheral devices as if they were part of the computer's memory, allowing both data and device control registers to be accessed using standard memory instructions. Direct I/O, on the other hand, uses specific instructions to access device registers and transfer data, not involving the general memory address space.

Memory- Mapped I/O and Direct I/O Differ in That Memory-