>Actually, when I look at the osc. pins on my 16C84 w/ 4MHz xtal and two caps with a 200MHz >scope, I see a very perfect sine wave. The xtal can't oscilate in a square wave fasion, since >its' not resonant at the additional harmonics needed to cause the square wave shape. I also >think that the inverter is operating in its linear region, thus not swinging from rail to >rail >suddenly anyway. My scope sees a 4V p-p sine on my pic. One little correction to my own mail: I actually see a 5V p-p sine wave on one of the osc pins. It is also very slightly distorted (not flat-topping, rather the slope is a bit incorrect at around the 1 and 4 volt points). The other pin shows the undistorted 4V p-p Sean +-------------------------------+ | Sean Breheny | | Amateur Radio Callsign: KA3YXM| | Electrical Engineering Student| +-------------------------------+ Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 mailto:shb7@cornell.edu Phone(USA): (607) 253-0315 ICQ #: 3329174