Something I thought of today triggered when I thought about the status led flickering in R&D mode... I think it just shows up CPU activity, right? Well. why not make the status led function as serial output! That'd be lot easier than using the AUX output, since you'd not need any fancy modulation schemes and the bandwidth would be eornomous You'd just need a photodiode hookup that you'd place on top of the led, converting it directly to serial signal wired to PC