> Is there even one mid-range device that dosen't support the TRIS instruction > on ports A,B and C? Officially many of them don't, including the 16F872. Some silicon, may, this rev, support the instruction without it being listed. You definitely don't want to be writing TRIS in new code for these chips. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.