Hai, Please help me, I have Keil c51 evaluation edition. I have wrote a simple number incrementing programme. And compiled. I got the follwing warning. How to eliminate this. *** WARNING L1: UNRESOLVED EXTERNAL SYMBOL SYMBOL: ?C_STARTUP MODULE: Test.obj (TEST) Another thing I have noticed in generated hex file is, the program's starting address is not at location 0x00. How to locate the porgramme at location 0x00. The selected device is AT89C51. Please kindly help me.