Exam 12: Io Systems

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A) there is an increasingly broad variety of I/O devices.
B) new devices are similar to the previous I/O devices that makes it easier to incorporate them in operating systems.
C) to encapsulate the oddities of different I/O devices, the device drivers present device-specific interface for each device to the I/O subsystem.
D) All of the above.

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A buffer is a memory area that stores da...

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The programmable interval timer is hardw...

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Interrupt chaining is a technique in whi...

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A) the hardware controller when it notifies the CPU that the device is ready for service.
B) the basic polling operation that may be comprised of several CPU instructions.
C) polling when it is attempted repeatedly yet rarely finds a device ready for service.
D) the slow data transfer rate between a device and the host.

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A) allows a user to interrupt a device at any time.
B) allows access to a few additional devices, such as a time-of-day clock and a timer.
C) transparently passes arbitrary commands from an application to a device driver.
D) enables managing of devices with widely varying speeds ranging from a few bytes per second to gigabytes per second.

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