Yes. NASA Glenn Research Center in Ohio has one, I believe. They were building it when I was an intern ~6 years ago. Of course, Glenn also has high temperature

Yes. NASA Glenn Research Center in Ohio has one, I believe. They were building it when I was an intern ~6 years ago. Of course, Glenn also has high temperature electronics. Memory is hard to come by, but simple analog and digital circuits are feasible (enough for data digitization, multiplexing, some forward error correction, and transmission to orbital assets). Here are a couple papers on the idea of all-high-temperature-electronics designs (which I think are a lot more realistic and effective than a mechanical automaton, as fun as that sounds) for a long duration lander design (can be adapted to a rover, etc, as well) related to the work I did: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20140017762.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/201400... https://www.sciencedirect.com/science/article/pii/S0094576515000594 https://www.sciencedirect.com/science/article/pii/S009457651...