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Computer Organization and Architecture Input/Output …

1 Chapter 7 Input/OutputComputer Organization and ArchitectureInput/ output Problems Computers have a wide variety of peripherals Delivering different amounts of data , at different speeds, in different formats Many are not connected directly to system or expansion bus Most peripherals are slower than CPU and RAM; a few are faster Word length for peripherals may vary from the CPU data format may vary ( , one word might include parity bits)I/O Modules Peripheral communications are handled with I/O modules Two major functions: Interface to processor or memory via bus or central link Interface to one or more peripherals via tailored data linksGeneric Model of I/O ModuleExternal Devices Human readable (human interface) Screen, printer, keyboard, mouse Machine readable Disks, tapes Functional view of disks as par

Input/Output Computer Organization and Architecture Input/Output Problems • Computers have a wide variety of peripherals —Delivering different amounts of data, at different speeds, in different formats • Many are not connected directly to system or expansion bus • Most peripherals are slower than CPU and RAM; a few are faster

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aturing.umcs.maine.edu

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www.csee.umbc.edu

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