> All nodes on the network are identical, all joining onto a single bus - > ie each pic doesnt receive and the re-transmit the data. > > (each pic is also programmed identicaly - including ID bits) For the sake of a longer development time for a method that might work, wouldn't it be easier to buy, borrow, rent a programmer with serialising in it ? Some of the low end ones do it. Steve. ====================================================== Very funny Scotty. Now beam down my clothes. ====================================================== Steve Baldwin Electronic Product Design TLA Microsystems Ltd Microcontroller Specialists PO Box 15-680 email: steveb@kcbbs.gen.nz New Lynn, Auckland ph +64 9 820-2221 New Zealand fax +64 9 820-1929 ======================================================