David Duffy (AVD) wrote: > I'm not saving / restoring them in the ISR, as I understand this > particular chip does that by itself. I haven't used one of the enhanced PIC 16 yet. I just checked, and both FSRs are automatically saved/restored by the interrupt hardware, so that's apparently not the issue. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .