{ From what I gather from these two routines, in order to "Normalize" a crc value, you must reverse the order of the four bytes in the value. Example: crc value = $01020304 normalized = $04030201 Am I correct in assuming this? If so, the two procedures above fail to perform that task, so here is a BASM routine that I have tested and works perfectly. } Procedure Normalize(Var crc: LongInt); Assembler; ASM LES DI, crc MOV AX, WORD PTR ES:[DI] MOV BX, WORD PTR ES:[DI + 2] XCHG AH, AL XCHG BH, BL MOV WORD PTR ES:[DI + 2], AX MOV WORD PTR ES:[DI], BX End; Please forward a copy of your response to Serge Paquin who wrote the original request for CRC routines.