Hello, I am new to the C51 Compiler and I have problems getting the debug to work the way I want. the Simulator mode dont show the output of printf and so far, I cant debug my programs. Amos
"The output from printf() will show up in one of the serial windows. (There are two.)" You have to assign the UART output to a serial window or COM port. AS I said before, you need to read the Manual and do the examples - then it will all become clear!