It appears that, at least as recently as August 2000, a Cyber 170 driving the Early Warning Radar System at Cape Cod Air Force Station, known as "Pave Paws", was still in operation. Discussions were going on at that time w/r/t its replacement. This machine, sans media, disks, etc, might be a good candidate for a future rescue (since it's military, they may want to wipe the disks using hammers).