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In IBM’s S360/370 systems _____ lines are used to select the I/O devices.

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In IBM’s S360/370 systems _____ lines are used to select the I/O devices.

(a) SCAN in and out

(b) Connect

(c) Search

(d) Peripheral

I had been asked this question in an interview.

My question is from Asynchronous BUS topic in chapter Input/Output Organisation of Computer Architecture

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Right option is (a) SCAN in and out

The explanation is: The signal is used to scan and connect to input or output devices.

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