Tape Operating System
<operating system> (TOS) An {IBM} {operating system} for
{System 360}, used in the early days around 1965 to support
the {IBM 360} model 30 et al. TOS was a predecessor to IBM's
{Disk Operating System}.
TOS died out really early as disks such as the 2311 and 2314
became common with the {IBM 360} whereas thet had been a real
luxury on the {IBM 7090}.
[Relationship to {BOS}?]
(1999-01-20)