Checked reset flags, seems like a reset instruction is being executed, but there isn't one in the code. I'm thinking both these 2550s are faulty, considering the Exact Same Code runs perfect on one of my 4550 boards. I haven't any idea why it would be that way, but it is what it is and that's all it is. Thanks for the help Andrew --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .