There's not much now, but I've put some optimized CRC routines onto a web page: http://www.dattalo.com/technical/software/pic/crc.php You'll find the two routines that were discussed recently and a third that I also needed. Scott -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body