Basic Operating System

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Basic Operating System

(operating system)
(BOS) An early IBM} operating system.

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 360's with no disks and limited tape drives.

BOS died out really early s disks such as the 2311 and 2314 became common with the IBM 360, whereas disks had been a real luxury on the IBM 7090.