I believe that's pretty much what the PICMaster probe does, with a special chip/package that brings out the address and data lines for inspection. ______________________________ Reply Separator _________________________________ Subject: Cheap ICE Author: martin@DC.CIS.OKSTATE.EDU at internet Date: 11/7/96 4:13 PM In a variation on the old saying, "It takes a thief to catch a thief," it seems that the best ICE would be the actual device if one could know what it was actually doing.