CRC question

---snip---> > Could even be XORing the contents with a LFSR. Hard to say without > seeing it. > Hi Of course, a CRC is just a special polynomial LFSR that has a large field of zeros so that it cna be used for burst correction. It seems the code is CRC. The code may just do a bit at a time or may have a table lookup to do a byte at a time. I've even seen nibble at a time. If it were doing a real CRC, one could even locate a burst of bit errors and fix the EPROM if one knew the polynomial used. To my knowledge, I don't know if any of the assemblers had a CRC calculator built in. The final check number was most likely calculated after the assembly and just added to the code. If in the listing, this may have been a second pass through the assembler. Dwight _________________________________________________________________ Windows Live Hotmail and Microsoft Office Outlook ? together at last. ?Get it now. http://office.microsoft.com/en-us/outlook/HA102225181033.aspx?pid=CL1006269…