Question Discussion & Solution

MCQ

The _________ are reserved for events such as unrecoverable memory errors.

non maskable interrupts

blocked interrupts

maskable interrupts

none of the mentioned

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MCQ

If the number of cycles spent busy - waiting is not excessive, then ____________

interrupt driven I/O is more efficient than programmed I/O

programmed I/O is more efficient than interrupt driven I/O

both programmed and interrupt driven I/O are equally efficient

none of the mentioned

Discussion

MCQ

In a programmed input/output(PIO) __________

the CPU uses polling to watch the control bit constantly, looping to see if a device is ready

the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available

the CPU receives an interrupt when the device is ready for the next byte

the CPU runs a user written code and does accordingly

Discussion

MCQ

Division by zero, accessing a protected or non existent memory address, or attempting to execute a privileged instruction from user mode are all categorized as ________

errors

exceptions

interrupt handlers

all of the mentioned

Discussion

MCQ

When device A has a cable that plugs into device B, and device B has a cable that plugs into device C and device C plugs into a port on the computer, this arrangement is called a _________

port

daisy chain

bus

cable

Discussion

MCQ

In general the two interrupt request lines are ____________

maskable and non maskable interrupts

blocked and non maskable interrupts

maskable and blocked interrupts

none of the mentioned

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Distributed Operating System

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