I'm using a Panaconic 4MHz Ceramic Resonator (efoec4004a4) and its not resonating. In their test circuit for an oscillation ciruit they have a 1Mohm resistor across pins 1 and 3. Is this required for a 16c74a. What oscillator type should I use in MPLAB (HS, RS, XT etc). tia. -- Donald C. Parker, Keystone Applications, Brooklyn, WI Phone: 608-835-9264 Primary Inet: dparker@execpc.com Secondary: parker@acm.org WWW: http://acm.org/~parker/homepage.html It is better to be a mouse in a cat's mouth than a client in a lawyer's hand. Mario Cuomo