&gt; The most notable the Apollo 11 Rendezvous Radar Switch eating all available CPU and nearly aborting the mission.<p>Except that it wasn&#x27;t. The Apollo Guidance Computer had full multitasking, and it was reporting that the rendezvous radar, which the crew had accidentally left on, was <i>trying</i> to eat up CPU and was denied it by the scheduler. The (correct) reaction was ignoring it and letting the scheduler continue booting the radar off the task list.