Drew Vassallo wrote: > This is true. And I do have some "clever" programming in my code. This is > why I fear an underflow, but I don't really expect it. It's maybe a 2% > possibility. However, it *is* possible, and I'd like to verify 100% that it > will not occur. Just a long shot, but would it be possible to just increment a register just before any call and dec it just before any return?? That might give you a stack count you could check in software. How badly do you want to find out?? :o) -Roman -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu