Basic Operating System (BOS) An early [when?] . According to folklore, BOS was the predecessor to on the and it was 'd from a . It may have been intended for very small 360's with no disks and limited tape drives. BOS died out really early [when?] as disks such as the 2311 and 2314 became common with the , whereas disks had been a real luxury on the . (1999-01-29)