Hi All !!! I'm using the evaluation version of Keil with uVision 2. I tried a simple program in C, it initializes the IO port P0 with a fixed value and then keeps rotating it indefinitel on the port. The program works perfectly fine in simulator, but the moment I fuse it into the target, just nothing seems to happen, no LEDs blink on, no signal whatsoever on the P0 pins of IC. There's no problem with the hardware, I know it for sure. My guess is that there's something wrong with the symbol relocation stuff in perhaps the linker phase. Following is an excerpt from the map file generated, which clearly shows a GAP at the address 0003h and 3ffch. The code seems to have been located at 3ffdh. Should the target execute the code ??? Is it a good behaviour on part of whoever relocates the symbols and code ??? And is this indeed the problem with nothing happening with my target ??? If this is the case, lastly, then has anybody got the clue of getting around with this all ??? Thx in Anticipation ... FAISAL ... **************************************** ** Link Map *** **************************************** LINK MAP OF MODULE: shift (SHIFT) TYPE BASE LENGTH RELOCATION SEGMENT NAME ----------------------------------------------------- * * * * * * * D A T A M E M O R Y * * * * * * * REG 0000H 0008H ABSOLUTE "REG BANK 0" IDATA 0008H 0001H UNIT ?STACK * * * * * * * C O D E M E M O R Y * * * * * * * CODE 0000H 0003H ABSOLUTE 0003H 3FFDH *** GAP *** CODE 4000H 0019H UNIT ?PR?MAIN?SHIFT CODE 4019H 000CH UNIT ?C_C51STARTUP **************************************** ** Link Map *** ****************************************