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Chapter 8. Interrupt-Driven I/O - Pg. 110

110 Chapter 8. Interrupt-Driven I/O CHAPTER OBJECTIVES · · · · · · · · · How Programmed I/O Works Driver Initialization and Cleanup Writing a Start I/O Routine Writing an Interrupt Service Routine (ISR) Writing a DpcForIsr Routine The Parallel Port Parallel Port Loopback Driver Testing the Parallel Port Loopback Driver Summary Some devices transfer data through registers, requiring continual CPU interaction. Such devices