Hi, MPLAB v8.76 used on a dsPIC30F2011, at program memory address 0x100 before = my code, MPLAB always (i.e. even in release code) adds automatically these two instructions: addr opcode mnemonic 0x100 DA4000 ReservedBR 0x102 FE0000 Reset I am able to make guesses of course, I wonder if anyone (MicroChip employee= ?) knows exactly the facts behind this. With kind regards, Mario --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .