I am using c51 compiler and uv2. I wrote a small program for 89c51ed2. I included startup.a51 in the project but unable to build the project. It gives me a warning saying "unresolved external symbol C_START". I don't understand why this is happenning? Also when I change STARTUP.A51 to show xdata memory from 0000h to 06FFh, the map file generated shown "xdata end" at 0xFFFF. Is it OK?