AVRISPwith a blown up AT90S8535

Q: What happens when an exposed Vcc pin of a target system (with an AVRISP connected to it) accidentally brushes against a +12V DC battery terminal?

A: The AT90S8535 (inside the AVRISP) blows its lid off - literally. The pictures below say it all. (Happened during Robocon days at VESIT)

For a photograph of a silicon chip inside an AVR (A90S1200) with its various regions marked, look here.