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In the output interface of the parallel port, along with the valid signal ______ is also sent.

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In the output interface of the parallel port, along with the valid signal ______ is also sent.

(a) Data

(b) Idle signal

(c) Interrupt

(d) Acknowledge signal

This question was addressed to me at a job interview.

This intriguing question comes from Parallel Port topic in chapter Input/Output Organisation of Computer Architecture

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The correct answer is (b) Idle signal

Easiest explanation: The idle signal is used to check if the device is idle and ready to receive data.

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