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Previous Year Question (PYQs)

Match List I with List II.
List I List II
(A) Handshaking (I) I/O interface informs the CPU that device is ready for transfer
(B) Programmed I/O (II) Requires two control signals working in opposite directions
(C) Interrupt-initiated I/O (III) Has local memory and controls large set of I/O devices
(D) I/O processor (IV) Requires CPU to check the I/O flag and perform transfer
Choose the correct answer from the options given below:




Solution

Handshaking requires two control signals working in opposite directions.

So, (A) matches with II.

Programmed I/O requires the CPU to continuously check the I/O flag and perform the transfer.

So, (B) matches with IV.

In interrupt-initiated I/O, the I/O interface informs the CPU that the device is ready for transfer.

So, (C) matches with I.

An I/O processor has local memory and controls a large set of I/O devices.

So, (D) matches with III.

Final matching is:

A-II, B-IV, C-I, D-III

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