Hello, I filled in the "Register Stimulus" dialog box (file name, PC addr for when xfer is to occur, and the register to be written.) I single stepped through my code while viewing a watch window and saw none of the stimulus file coming in to the register. Always zero. I double checked my file & path. Made a loop for many reads but still see nothing but zero in my register. Using RCREG as the register. Also tried WREG as the register. Bank is set to zero. What am I missing? Brian