Hi, I have a strange case of appearing NOP's :) This is the assembly code I have written in MPLAB 6.4 ie. what is in the .asm file: Line # 22 addwf PCL,1,0 23 goto RS0 24 goto RS1 25 goto RS2 26 goto RS3 27 return But when I assemble it, I get this in the "Program Memory" file, this is from the .hex file: Line# Address 18 22 ADDWF 0xff9, 0x1, 0 19 24 GOTO 0x36 20 26 NOP 21 28 GOTO 0x42 22 2A NOP 23 2C GOTO 0x4c 24 2E NOP 25 30 GOTO 0x56 26 32 NOP 27 34 RETURN 0 There are strange NOP's that it has added in every 4 memory locations. Why does the Assembler do this? Is there any way to stop it doing this? Thanks Christopher Tyler -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics