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List Out The Differences Between Isolated I/o And Memory Mapped I/o.?

Answer»

The characteristics of isolated I/O are as follows:

  1. The devices of I/O are TREATED in a separate DOMAIN as compared to MEMORY.
  2. A total of 1mb address space is allowed for memory applications.
  3. In order to maximize the I/O operations ( isolated ) separate instructions are always provided to perform these operations.
  4. One of the disadvantages is that the data transfer only occurs between the I/O port and the AL, AX registers.

The characteristics of the memory mapped I/O are as follows:

  1. In such scenarios the devices (I/O) are treated as a part of the memory only.
  2. Complete 1mb of memory cannot be used as they are a part of the memory.
  3. In case of memory mapped I/O operations no external separate instructions are required.
  4. There is data transfer restriction in case of memory mapped instructions.

The characteristics of isolated I/O are as follows:

The characteristics of the memory mapped I/O are as follows:


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