PSOS (real-time operating system): Difference between revisions

Revision as of 14:53, 31 December 2021

Revision as of 14:30, 27 April 2022

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{{Lowercase|title=rtospSOS}}

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{{Anchor|SCG|ISI}}

{{Infobox OS

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'''rtospSOS''' ('''Portable Software On Silicon''') is a [[real-time operating system]] (RTOS), created in about 1982 by Alfred Chao, and developed and marketed for the first part of its life by his company Software Components Group (SCG). In the 1980s, rtospSOS rapidly became the RTOS of choice for all [[embedded system]]s based on the [[Motorola 68000 series]] family architecture, because it was written in 68000 [[assembly language]] and was highly optimised from the start. It was also modularised, with early support for OS-aware debugging, plug-in [[device driver]]s, [[Internet protocol suite]] (TCP/IP) stacks, language [[Library (computing)|libraries]], and disk subsystems. Later came [[source code]] level debugging, [[multiprocessing]] support, and further [[computer network]]ing extensions.

In about 1991, Software Components Group was acquired by Integrated Systems Inc. (ISI) which further developed pSOS, then renamed as pSOS+, for other microprocessor families, by rewriting most of it in the [[programming language]] [[C (programming language)|C]]. Attention was also paid to supporting successively more [[integrated development environment]]s, culminating in pRISM+.