On Wed, 30 Oct 2002, Brooke Clarke wrote: *>Any ideas what might cause the ISR to quit yet allow the mail loop to *>continue? Setting or resetting an ISR enable flag in more than one place for example. These faults are very hard to find. I would group all code that accesses the interrupt setup system and analyze it for process flow. Peter -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu