hello .. i have a problem with the generation of monitor program for my application. On my specific application, we have an second uart which needs to be configured for serial interface for debuging with mon51 keil. uart2 has s2con and s2buf sfrs (its own sfr space), serial interrupt is addressed to 0x2B vector space. and the clocking of serial interface is by internal baud rate generator.. monitor code should be installed at 0x0000. can you tell me what needs to be changed in install.a51 ans startup.a51 to generate appropriate mon51 file for my application .?? there are some errors generated when i change to my needs .. thanks pruthvi