1. Basic Operating System system> BOS An early [when?] IBM operating system. According to folklore, BOS was the predecessor to TOS on the IBM 360 and it was IPLd from a card reader. It may have been intended for very small 360s 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 IBM 360, whereas disks had been a real luxury on the IBM 7090.
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