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In most courses in computer organization an important topic is that of communication between the cpu and input/output devices. Some of the relevant issues are: synchronous versus asynchronous exchange of information, handshaking, and interrupt-driven versus programmed I/O (polling). After having taught such a course for several years, we have found that students tend to become confused as soon as we get to the point of attempting to explain how the various status and control signals between the processor and the perlpheral device work to manage the transfer of data. For that reason we have developed an analogy that simplifies and makes more understandable the subject of parallel communication.

Communication between computers and peripheral devices—an analogy