I am using Keil Mon51 with install 7 BF 0 to get the MON at 0x0000. (AutoBaud with T1) My hardware has Ram from 0x4000 to 0xBFF (code and xdata). Further I set DEF_PC_VAL to 0x4000 in install.a51 So far every thing works but I can't use GO_TIL_MAIN because uVision ignores the DEF_PC_VAL and starts at 0x0000. I have to set manually PC=0x4000 G ,Main in the Command Window Is ther any other work around ?