The enduring memories of the IBM 1130 may have resulted from its need for continual human intervention. It was usually occupied running "jobs" specified by a deck of punched cards. The human operator would load jobs into the card reader and separate them back into jobs for return, perhaps along with printed output, to the submitter. The operator would also have to watch the 1130 for evidence of a malfunctioning or stalled job and intervene by pressing the key on the keyboard to skip ahead to the start of the next job.