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Silberschatz, Galvin and Gagne ©2005

Operating System Concepts

Computer-System Operation

I/O devices and the CPU can execute concurrently.

Each device controller is in charge of a particular device type.

Each device controller has a local buffer.

CPU moves data from/to main memory to/from local buffers

I/O is from the device to local buffer of controller.

Device controller informs CPU that it has finished its operation by causing an interrupt.

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