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The two main jobs of a computer are input/output (I/O) and processing. The role

The two main jobs of a computer are input/output (I/O) and processing. The role of the operating system in computer I/O is to manage and control I/O operations and I/O devices.
Computers operate a great many kinds of devices. Most fit into the general categories of storage devices, transmission devices, and human-interface devices. Despite the incredible variety of I/O devices, we need only a few concepts to understand how the devices are attached and how the software can control the hardware.
Write a 5- to 6-page paper (1250 to 1650 words), documented in APA Style, pertaining to I/O hardware. At a minimum, the paper should address the following:
The main concepts pertaining to how the devices are attached and how the software can control hardware
Relevant points, including definitions of the following:
Buses, especially a PCI bus
Controllers
I/O port registers
Polling
Interrupts
Direct memory access
Textbook Readings
Review Chapters 11 through 15 in Silberschatz, Galvin, and Gagne, Operating System Concepts.
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