Advantages and disadvantages of isolated I/O

Input and output devices (I/O) are the parts of a computer system, such as the keyboard or the modem, that send or receive information to and from the computer's processors. In memory-mapped I/O systems, I/O devices use part of the computer's memory as the address for transmitting messages. In computers with isolated-memory systems, I/O and memory have different addresses.

I/O

Computer systems can map I/O to an address in the memory banks because the process of messaging I/O devices is similar to exchanging data with computer memory. The same bus -- the electronic pathway for transmitting information to and from the processors -- serves to access both memory and input and output devices. One disadvantage to isolated memory is that memory-map systems are simpler for the bus, as it uses the same set of addresses for I/O and memory operations.

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