I figured I'd take one more whack at getting the onboard oscillator to work on the 14000 before I give up and go external. The problem appears to be in the interpretation of the on-board calibration constant OSCM. I'm using this following the formula given in the app notes to determine the measured clock speed, and I've tried accessing OSCM both directly and via the call provided as part of the HiTech package. It obviously doesn't work, because no matter what I do, the serial bit-banging timing is screwed up. Works fine with an external oscillator. Anybody have any ideas? -Will