Hello, I've got a problem with the compilation of a programm with Keil C51 v6.14. Perhaps someone has an idea, which might help me. The Problem: We've got a sourcecode, from a third party person, who has programmed it for us. The person says, she had programmed it on Keil C51 v3. He also has sended as a binary, which should be build of the source. But the problem is, if we download the binary to our hardware, it works fine. But if we compile the source self and download it, it doesn't work. If we change the otimization settings, the reactions of the hardware totally differ. Now is my question, can I set the v6.14 to compile like a v3? Thanks in advance for helping me. Henning Veller