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What is DB(P) line?

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What is DB(P) line?

(a) That the data line is carrying the device information

(b) That the data line is carrying the parity information

(c) That the data line is partly closed

(d) That the data line is temporarily occupied

I had been asked this question at a job interview.

My question comes from SCSI BUS-1 topic in division Input/Output Organisation of Computer Architecture

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Right answer is (b) That the data line is carrying the parity information

To explain: None.

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