Basic Operating System

<operating system> (BOS) An early [when?] 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 [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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Basic Language for Implementation of System Softwa
Basic Multilingual Plane
Basic Object Adapter
Basic Object System
Basic Programming Support
Basic Rate Interface
Bastard Operator From Hell
bastion host