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Q.

An I/O port typically consists of four registers status, control, ________ and ________ registers.

A

system in, system out

B

data in, data out

C

flow in, flow out

D

input, output

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Which hardware triggers some operation after certain programmed count?

A

programmable interval timer

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interrupt timer

C

programmable timer

D

none of the mentioned

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2.

The host sets _____ bit when a command is available for the controller to execute.

A

write

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3.

What is an interrupt vector?

A

It is an address that is indexed to an interrupt handler

B

It is a unique device number that is indexed by an address

C

It is a unique identity given to an interrupt

D

None of the mentioned

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4.

An I/O port typically consists of four registers status, control, ________ and ________ registers.

A

system in, system out

B

data in, data out

C

flow in, flow out

D

input, output

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Spooling ____________

A

holds a copy of the data

B

is fast memory

C

holds the only copy of the data

D

holds output for a device

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