LZ_522_Topic3B

Front

Which of the following best describes programmed I/O?

Back

The processor directly controls the I/O operation using instructions

Front

What is the main disadvantage of programmed I/O?

Back

The processor wastes time polling the device

Front

After the processor issues an I/O command, what happens next?

Back

The I/O module completes the operation and updates its status

Front

Which command tells the I/O module to obtain data from a peripheral?

Back

Read

Front

In programmed I/O, the Test command is used to:

Back

Check the status of an I/O device

Front

In programmed I/O, the relationship between I/O instructions and commands is:

Back

Often one-to-one and simple

Front

In memory-mapped I/O, device registers are treated as:

Back

Memory locations accessed like normal data

Front

In isolated I/O, devices are accessed:

Back

Using special I/O commands

Front

Which I/O technique allows the processor to perform other tasks while waiting for I/O completion?

Back

Interrupt-driven I/O

Front

A key advantage of memory-mapped I/O is that:

Back

It allows more instructions to be used for I/O