Hi Guys, Once again, thank you for all the replies. I decided to put the blip in the "too hard" basket for the time being and continued on finishing this project off. I had been testing that the software was correct using my JW parts - without being too concerned about timing. I just burnt a plastic part in order to check all my timings and discovered no blip at all! It's only happening on the JW parts. Not the first time I have noticed differences between the JW and plastic parts. Just thought I might share this with the list. Regards, Sean -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads