Question

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 & control   large set of I/O devices.
(D) I/O processor	(IV) require CPU to check the I/O   flag & perform transfer

 

Choose the correct answer from the options given below:

1. A - I, B - II, C - 10, D - IV 
2. A - II, B - IV, C - III, D - I 
3. A - II, B - IV, C - I, D - III
4. A - IV, B - III, C - II, D - I 

Answer 1

Correct Answer - Option 3 : A - II, B - IV, C - I, D - III

The correct answer is option 3.

Handshaking:

When one computer sends a message to another indicating that it wants to create a contact channel, it is called handshaking.  It requires two control signals working in opposite directions

Programmed I/O:

​​The output of the I/O instructions written in the computer programme is the trigger. It requires the CPU to check the I/O   flag & perform the transfer

Interrupt-initiated I/O:

Interrupt powered I/O is a different way to deal with I/O. Interrupt I/O is a method of monitoring input/output operation by sending a signal from a peripheral or terminal that needs to send or receive data. I/O interface informs the CPU that the device is ready for transfer

I/O processor:

A processor with direct memory access is known as an input-output processor (IOP). The computer system is divided into memory units and processors in this way. I/O processor has local memory & control a large set of I/O devices.

∴ Hence the correct answer is A-II, B - IV, C - I, D - II.