Go browse the small engine forum and see the questions on gas chain saws. Then go buy an electric one. An electric one is likely on the light duty side for such a job, but how often do you plan on doing it? Better yet, hang a sign on it, ''Free firewood''. Wait and see if somebody stops by and offers you a price. If we lived anywhere close, I would come by and cut it up for $50.
Hope you had a good UPS on your computer. What was it, a crummy silver maple? Our electic company is doing a clear cut of anything within 10' of their lines.