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The Input devices can send information to the processor.

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The Input devices can send information to the processor.

(a) When the SIN status flag is set

(b) When the data arrives regardless of the SIN flag

(c) Neither of the cases

(d) Either of the cases

This question was posed to me in an online quiz.

This is a very interesting question from Functional Units of a Computer in section Basic Structures of Computers of Computer Architecture

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Right option is (a) When the SIN status flag is set

The best explanation: The input devices use buffers to store the data received and when the buffer has some data it sends it to the processor.

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