What is a circular buffer?

• A. Writes to the end of its space and then continues at the beginning
• B. Overwrites older values as it goes
• C. All of the mentioned
• D. None of the mentioned

All the changes that were done from a transaction that did not commit before the system crashed, have to be _________

• A. Saved
• B. Saved and the transaction redone
• C. Undone
• D. None of the mentioned

I/O hardware contains ____________

• A. Bus
• B. Controller
• C. I/o port and its registers
• D. All of the mentioned

The data-in register of I/O port is ____________

• A. Read by host to get input
• B. Read by controller to get input
• C. Written by host to send output
• D. Written by host to start a command

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

• A. Write
• B. Status
• C. Command-ready
• D. Control

When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________

• A. Port-mapped i/o
• B. Controller-mapped i/o
• C. Bus-mapped i/o
• D. None of the mentioned

Device drivers are implemented to interface ____________

• A. Character devices
• B. Block devices
• C. Network devices
• D. All of the mentioned

Which hardware triggers some operation after certain programmed count?

• A. Programmable interval timer
• B. Interrupt timer
• C. Programmable timer
• D. None of the mentioned

The device-status table contains ____________

• A. Each i/o device type
• B. Each i/o device address
• C. Each i/o device state
• D. All of the mentioned

Which buffer holds the output for a device?

• A. Spool
• B. Output
• C. Status
• D. Magic