Not an airplane, but I have a few HP calculators (50G, 12C, 15C) that run an emulator for a chip that is no longer produced because nobody wants to port the sof

Not an airplane, but I have a few HP calculators (50G, 12C, 15C) that run an emulator for a chip that is no longer produced because nobody wants to port the software. They still make the 12C. I wouldn't trust them to port it without introducing weird bugs after seeing stuff like the 35S anyway.