Hacker News new | ask | show | jobs
by devnonymous 3411 days ago
Like almost everything in Computer science there would be no clear definition of first OS ever. There used to be monitor programs and schedulers before they iteratively evolved into OS programs. Just like, programming languages, servers, 'cloud'... There seldom is a first ever something in our field.
1 comments
brett40324 3410 days ago
Im curious what "monitor programs" means here in this context?

The first OS was OS/360 at IBM in 1964.

link
skissane 3410 days ago
OS/360 was not the first OS. Quite a number of operating systems came before it.

Examples of earlier operating systems include SHARE Operating System (SOS), first version in 1959, for the IBM 709 mainframe; which in turn was itself was based on an earlier operating system, GM-NAA I/O, first version in 1956.

A very notable pre-OS/360 operating system was MIT's CTSS operating system, the first timesharing OS, first version in 1961 for the IBM 7094. The first versions of OS/360, by contrast, notably lacked timesharing – that was initially provided by alternative IBM operating systems (TSS/360 was the official answer and CP/CMS, which later became VM/CMS, the principal unofficial one); OS/360 only gained timesharing support itself when TSO was released in 1971.

link
devnonymous 3410 days ago
https://en.m.wikipedia.org/wiki/Resident_monitor
link