Secondary Memory,Input Output interfce(DMA,Interrupts) Questions

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14.

The advantage of I/O mapped devices to memory mapped is ___________

A

The former offers faster transfer of data

B

The devices connected using I/O mapping have a bigger buffer space

C

The devices have to deal with fewer address lines

D

No advantage as such

Correct Answer: C

Since the I/O mapped devices have a separate address space the address lines are limited by the amount of the space allocated.

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15.

The system is notified of a read or write operation by ___________

A

Appending an extra bit of the address

B

Enabling the read or write bits of the devices

C

Raising an appropriate interrupt signal

D

Sending a special signal along the BUS

Correct Answer: D

It is necessary for the processor to send a signal intimating the request as either read or write.

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16.

To overcome the lag in the operating speeds of the I/O device and the processor we use ___________

A

BUffer spaces

B

Status flags

C

Interrupt signals

D

Exceptions

Correct Answer: B

The processor operating is much faster than that of the I/O devices, so by using the status flags the processor need not wait till the I/O operation is done. It can continue with its work until the status flag is set.

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17.

The method of accessing the I/O devices by repeatedly checking the status flags is ___________

A

Program-controlled I/O

B

Memory-mapped I/O

C

I/O mapped

D

None of the mentioned

Correct Answer: A

In this method, the processor constantly checks the status flags, and when it finds that the flag is set it performs the appropriate operation.

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18.

The method of synchronising the processor with the I/O device in which the device sends a signal when it is ready is?

A

Exceptions

B

Signal handling

C

Interrupts

D

DMA

Correct Answer: C

This is a method of accessing the I/O devices which gives the complete power to the devices, enabling them to intimate the processor when they

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19.

The method which offers higher speeds of I/O transfers is ___________

A

Interrupts

B

Memory mapping

C

Program-controlled I/O

D

DMA

Correct Answer: D

In DMA the I/O devices are directly allowed to interact with the memory without the intervention of the processor and the transfers take place in the form of blocks increasing the speed of operation.

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20.

The process wherein the processor constantly checks the status flags is called as ___________

A

Polling

B

Inspection

C

Reviewing

D

Echoing

Correct Answer: A

None

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