When the IBM 1130 is started, the Supervisor is still in memory and probably intact, as core memory retains its state without power. If the operator concludes that a user program has stalled, the Supervisor can sense a key press to abort the program and skip ahead to the next // card. The Supervisor is not protected against modification by a badly written job, a case that might require that the operator reboot the 1130. Nor was there protection against writing to disk. If the copy of the system software on disk is modified, it can be restored by reloading it from about 4000 binary-coded punched cards (approximately two boxes).