Hi, List. I am building a test fixture for a product we make using a 12C509A. One of it's functions is integral programming of the PIC using ISP. I have got to the point where I am parsing the HEX file generated by MPASM and was suprised to find that the configuration word information appears in the second-to-last line in the HEX file, but at address 0xFFE, _not_ 0xFFF as I expected. What am I missing, or can someone explain this to me? The ISP app note for the 12C5XX from MChip clearly states that the config word is stored at location 0xFFF. Mark Skeels Engineer Competition Electronics meskeels@earthlink.net Soli Deo Gloria! -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body