GATE CS 2018 - Computer Organization Quiz 8 (I/O Interface)

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Question 1

Which of the following requires a device driver?

• ARegister
• BCache
• CMain Memory
• DDisk

Question 2

A CPU generally handles an interrupt by executing an interrupt service routine

• Aas soon as an interrupt is raised.
• Bby checking the interrupt register at the end of fetch cycle.
• Cby checking the interrupt register after finishing the execution of the current instruction.
• Dby checking the interrupt register at fixed time intervals.

Question 3

Which among the following is incorrect about DMA?

• AThe controller performs I/O operations
• BFirst register in interface stores address
• CThe controller gives special access to main memory
• DDMA interface carries status in second register

Question 4

A processor needs software interrupt to

• Atest the interrupt system of the processor
• Bimplement co-routines
• Cobtain system services which need execution of privileged instructions
• Dreturn from subroutine

Question 5

Identify the false statements:
: Separate I/O address space does not necessarily mean that I/O address lines are physically separated.
: Address decoder is an essential part of I/O interface.

• AOnly
• BOnly
• CBoth and
• DNeither nor

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