According to folklore, BOS was the predecessor to TOS on the IBM 360 and it was IPL[?]'d 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 as disks such as the IBM 2311[?] and IBM 2314[?] became common with the IBM 360, whereas disks had been a real luxury on the IBM 7090.
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