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An I/O port typically consists of four registers status, control, ________ and ________ registers.

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An I/O port typically consists of four registers status, control, ________ and ________ registers.

(a) system in, system out

(b) data in, data out

(c) flow in, flow out

(d) input, output

This question was addressed to me during an interview.

My question is taken from I/O System in portion I/O Systems of Operating System

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Best answer
Correct answer is (b) data in, data out

Explanation: None.

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