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\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. \subsection{Objectives}  The experiment is divided into three procedures, each with its own objectives as follows: of developing:  \begin{enumerate}[(i)] \begin{enumerate}[A.]  \item  \textit{Timer A ISR}\\  Displays ISR}  \\A simple program that displays  the number of times each of the Timer A interrupts have occured occurred  on the computer monitor. \\  \item  \textit{Timer B ISR}\\  Displays ISR}  \\A RTOS that holds  the number same functionality  of times each Part A without using 100%  of the Timer B interrupts have occured on the computer monitor. CPU.  \\  \item  \textit{Timer B ISR with reduce the CPU load}  \\Use the same structure from the previous procedure to read values from a sensor and write signal to a PWM to control and visualize the position of a ball inside a tube. \\  \\  \end{enumerate}