Difference between revisions of "MOS operating system"
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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 switch]]es and similar network applications. | 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 switch]]es and similar network applications. | ||
| − | It supported [[process]]es (but not [[ | + | It supported [[process]]es (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 programming language|C]]: at BBN, at UCL, and at Proteon. The latter version was portable, and also ran on the [[Motorola MC68000|MC68000]] and [[AMD29000]]. | 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 programming language|C]]: at BBN, at UCL, and at Proteon. The latter version was portable, and also ran on the [[Motorola MC68000|MC68000]] and [[AMD29000]]. | ||
Revision as of 09:26, 19 March 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.
