As an experiment I have just put a blank 16F73 into the circuit I'm = working on, there was no osc with a ceramic resonator, and no osc with an = RC. So maybe they don't, I'll try and find some more different PIC's and give = them a go. Jon Starr >>> Olin Lathrop 13/06/2002 15:47:43 >>> > Will a fresh, unprogrammed chip oscillate if it is powered up? It should as long as you hook it up for the oscillator mode that is = selected when all config bits are 1. On the 16F87x this is RC oscillator mode. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com=20 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.