COP 4600 - Final Exam
Questions With Correct Answers
What must I/O devices be connected to in order to do anything? -
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ANSWER✔✔✔-A computer |
What is a port? - ANSWER✔✔✔-A set of wires that connects an I/O
| | | | | | | | | | | | |
device and the computer.
| | |
A device that allows other devices to hook up to it in turn is said to
| | | | | | | | | | | | | | | |
support what? - ANSWER✔✔✔-Daisy-chained devices
| | | |
What is a bus? - ANSWER✔✔✔-A common set fo wires used by more
| | | | | | | | | | | | |
than one I/O device
| | |
If devices connect to ports, what do ports connect to? - ANSWER✔✔✔-
| | | | | | | | | | |
Buses
What is a controller? - ANSWER✔✔✔-The electronics that manage a
| | | | | | | | | |
port, bus or I/O device
| | | |
,What does the operating system actually talk to? - ANSWER✔✔✔-The
| | | | | | | | | |
device's controller |
What is a data in register? - ANSWER✔✔✔-Allows the computer to get
| | | | | | | | | | | |
input from the device
| | |
What is a data out register? - ANSWER✔✔✔-Allows the computer to
| | | | | | | | | | |
send output to the device
| | | |
What is a status register? - ANSWER✔✔✔-Indicates the current state of
| | | | | | | | | | |
the device, including whether the current command has completed,
| | | | | | | | |
whether the data registers are ready, and whether there is an error.
| | | | | | | | | | |
What is a control register? - ANSWER✔✔✔-A register that is used to
| | | | | | | | | | | |
send commands to the device
| | | |
What does the interrupt/trap mechanism handle? - ANSWER✔✔✔-
| | | | | | |
User-process calls for I/O, and notifications for those calls. Notifications
| | | | | | | | | |
from hardware about I/O completion, memory exceptions, arithmetic
| | | | | | | |
exceptions (divide by zero), and privilege exceptions.
| | | | | |
What is required in order for direct memory access to work? -
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ANSWER✔✔✔-Device controllers must be given their own channel to | | | | | | | | |
system memory, with its own control registers.
| | | | | |
, What is a device driver? - ANSWER✔✔✔-A piece of software intended
| | | | | | | | | | |
to handle interfacing with a particular device's controller.
| | | | | | |
What are some I/O device characteristics? - ANSWER✔✔✔-Stream
| | | | | | | |
versus block, sequential versus random, synchronous versus
| | | | | | |
asynchronous, sharable versus dedicated, read/write versus read-only
| | | | | | |
write-only, speed of operation. | | |
What are the fundamental functions of block devices? - ANSWER✔✔✔-
| | | | | | | | |
Read, write, and seek.
| | |
What are fundamental functions of character-stream devices? -
| | | | | | | |
ANSWER✔✔✔-Get and put (often still mapped to read and write with | | | | | | | | | | |
bufferring to allow multiple bytes to be read and written)
| | | | | | | | |
What is a socket interface? - ANSWER✔✔✔-Provides a file-like
| | | | | | | | |
metaphor for reading and writing to a network connection
| | | | | | | |
What are the three main functions of hardware clocks? -
| | | | | | | | | |
ANSWER✔✔✔-Report the current ime, report the elapsed time, and set | | | | | | | | |
an interval timer to report in the future.
| | | | | | | |
Questions With Correct Answers
What must I/O devices be connected to in order to do anything? -
| | | | | | | | | | | | |
ANSWER✔✔✔-A computer |
What is a port? - ANSWER✔✔✔-A set of wires that connects an I/O
| | | | | | | | | | | | |
device and the computer.
| | |
A device that allows other devices to hook up to it in turn is said to
| | | | | | | | | | | | | | | |
support what? - ANSWER✔✔✔-Daisy-chained devices
| | | |
What is a bus? - ANSWER✔✔✔-A common set fo wires used by more
| | | | | | | | | | | | |
than one I/O device
| | |
If devices connect to ports, what do ports connect to? - ANSWER✔✔✔-
| | | | | | | | | | |
Buses
What is a controller? - ANSWER✔✔✔-The electronics that manage a
| | | | | | | | | |
port, bus or I/O device
| | | |
,What does the operating system actually talk to? - ANSWER✔✔✔-The
| | | | | | | | | |
device's controller |
What is a data in register? - ANSWER✔✔✔-Allows the computer to get
| | | | | | | | | | | |
input from the device
| | |
What is a data out register? - ANSWER✔✔✔-Allows the computer to
| | | | | | | | | | |
send output to the device
| | | |
What is a status register? - ANSWER✔✔✔-Indicates the current state of
| | | | | | | | | | |
the device, including whether the current command has completed,
| | | | | | | | |
whether the data registers are ready, and whether there is an error.
| | | | | | | | | | |
What is a control register? - ANSWER✔✔✔-A register that is used to
| | | | | | | | | | | |
send commands to the device
| | | |
What does the interrupt/trap mechanism handle? - ANSWER✔✔✔-
| | | | | | |
User-process calls for I/O, and notifications for those calls. Notifications
| | | | | | | | | |
from hardware about I/O completion, memory exceptions, arithmetic
| | | | | | | |
exceptions (divide by zero), and privilege exceptions.
| | | | | |
What is required in order for direct memory access to work? -
| | | | | | | | | | | |
ANSWER✔✔✔-Device controllers must be given their own channel to | | | | | | | | |
system memory, with its own control registers.
| | | | | |
, What is a device driver? - ANSWER✔✔✔-A piece of software intended
| | | | | | | | | | |
to handle interfacing with a particular device's controller.
| | | | | | |
What are some I/O device characteristics? - ANSWER✔✔✔-Stream
| | | | | | | |
versus block, sequential versus random, synchronous versus
| | | | | | |
asynchronous, sharable versus dedicated, read/write versus read-only
| | | | | | |
write-only, speed of operation. | | |
What are the fundamental functions of block devices? - ANSWER✔✔✔-
| | | | | | | | |
Read, write, and seek.
| | |
What are fundamental functions of character-stream devices? -
| | | | | | | |
ANSWER✔✔✔-Get and put (often still mapped to read and write with | | | | | | | | | | |
bufferring to allow multiple bytes to be read and written)
| | | | | | | | |
What is a socket interface? - ANSWER✔✔✔-Provides a file-like
| | | | | | | | |
metaphor for reading and writing to a network connection
| | | | | | | |
What are the three main functions of hardware clocks? -
| | | | | | | | | |
ANSWER✔✔✔-Report the current ime, report the elapsed time, and set | | | | | | | | |
an interval timer to report in the future.
| | | | | | | |
