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hw8_sol - My UW | UW Search CS/ECE252 Introduction...

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My UW | UW Search Computer Science Home Page > ~markhill Home Contact Info Lecture & Notes Schedule LC-3 Simulator Grading Examinations Homework CS/ECE 252  Introduction  to Computer  Engineering Fall 2007 All Sections Instructors Mark D. Hill and Mikko Lipasti TAs Sanghamitra Roy, Eric Hill, Samuel Javner, Natalie Enright Jerger, & Guoliang Jin Homework 8  Solutions First contact for questions is TA Guoliang Jin ([email protected]) Problem 1 Problem 8.11 on page 216 of ItCS.
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Interrupt-driven I/O is more effcient than polling. Because, in polling, the processor needs to check a specific register (or memory location) regularly to see if anything is being input or output. This consumes unnecessary processing power because the processor checks the register periodically (stopping all other jobs) even when nothing is being input or output. (Most of the time the register will not be inputting or outputting anything unless it is a really I/O- intensive program). However, in interrupt-driven I/O, when
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