COP 4600 - Final Exam 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions and Verified Answers |
Already Graded A+
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
