Hello, Help me please how do I setup my compiler? I set up the off chip code memory to 0x4100 at target options but the compiler allways put a LJMP eg 452B (start of user code)at the ROM 0 location. When I try to run the program with Noice it warns me there is no writeable space at 0. How do I solve the problem? Do I need to modify and build in the startup51.asm ? Thanks Cheer George