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}.
(1999-01-29)