MOS operating system: Difference between revisions
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All were somewhat extended from the original; the first two fairly extensively, the latter only to make use of [[up-call]]s in the I/O system, and to support [[pseudo-terminal]]s. | All were somewhat extended from the original; the first two fairly extensively, the latter only to make use of [[up-call]]s in the I/O system, and to support [[pseudo-terminal]]s. | ||
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[[Category:Non-DEC Operating Systems]] | [[Category: Non-DEC Operating Systems]] | ||
[[Category: PDP-11 Operating Systems]] | [[Category: PDP-11 Operating Systems]] | ||
Revision as of 00:41, 20 October 2018
The MOS operating system (formally the 'Micro Operating System', but informally 'Mathis' Operating System', after the creator, Jim Mathis) was an operating system, originally for the PDP-11, used for a number of packet switches and similar network applications.
It supported processes (but not preemption, or creation/termination of processes), queued inter-process messages, asynchronous I/O, and allocation and freeing of main memory; it had no file system or other support for secondary storage.
The original version was written in MACRO-11, the assembly language for the PDP-11; it was later re-written at least three times in C: at BBN, at UCL, and at Proteon. The latter version was portable, and also ran on the MC68000 and AMD29000.
All were somewhat extended from the original; the first two fairly extensively, the latter only to make use of up-calls in the I/O system, and to support pseudo-terminals.
