Byron, Thanks for the info on Wloader. That almost looks like it could do the job. I need to use that same port pin in my application though during running of the user code. ie. The Bit-Bashed com port has a dual function. !) Bootloader upload of new user program, 2) Bi-directional serial com link. Any ideas ? Regards David Huisman --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.263 / Virus Database: 135 - Release Date: 6/22/01 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.