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\pagenumbering{arabic}  \section{Introduction}  The purpose of this lab is to become familiar with internal interrupt service routines (IISRs), aka synchronous interrupts, by using the kernel of the real-time operational system (RTOS) μC/OS-II in the IDE environment of Dynamic C to program in a Rabbit 2000 microprocessor unit of a development board Wildcat BL2000. Also, a sample of code to the configuration of a simple real-time operational system (RTOS) using μC/OS-II is provided.