We are using the C515C-L Infineon processor. We wrote a experimental program for pulse width modulation using timer T2. Everything went fine. After adding some RTX tasks, RTX uses timer T0 for its system timer, the interrupt routine for the T2 timer didn't work anymore. The created RTX tasks did run. Is there some initialization problem? We first start up the first RTX task, this task initializes the T2 timer and some other tasks. Another problem we have referes to the RTX51.lib file. We found out that we have to copy this file from the RTX directories to the ...\Keil\C51\LIB directory. Setting some directory paths related to the ...\RTX51\lib directory in the Keil environment did not work. Is copying this file the right approach or did we overlook something? Thanking you in advance Rom Brans