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

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{{Short description|None}}

{{Lowercase|title=pSOS}}

{{Use dmy dates|date=April 2019|cs1-dates=y}}

{{Use list-defined references|date=December 2021}}

{{Anchor|SCG|ISI}}

{{Infobox OS

| name = pSOS

| logo =

| screenshot =

| caption =

| developer = Alfred Chao, /Software Components Group (SCG )<br/>[[Integrated Systems Inc.]] (ISI )<br/ >[[Wind River Systems]]

| source_model source model = [[Closed source]] (original)<br/>[[Open source]] (later variants)

| kernel_type kernel type = [[Real-time operating system|Real-time]] [[Monolithic kernel|monolithic]]

| supported_platforms supported platforms = [[Motorola 68000 series]]

| ui =

| family =

| family = [[Real-time operating system]]s

| released = {{Start date and = age|1982}}

| latest release version = Reliant (RoweBots)

| latest_release_version =

| latest release date = {{Start date and age|2007|08}}

| latest_release_date =

| marketing_target marketing target = [[Embedded system]]s

| latest_test_version =

| programmed in = 68000 [[assembly language]]

| latest_test_date =

| language = =English

| marketing_target = [[Embedded system]]s

| update model =

| programmed_in = 68000 assembler

| package manager =

| prog_language =

| working_state working state = Discontinued

| language =

| license = [[Proprietary software|Proprietary]]

| updatemodel =

| website =

| package_manager =

| working_state = Discontinued

| license = [[Proprietary software|Proprietary]]

| website =

}}

'''pSOS''' ('''''P'''ortable '''S'''oftware '''O'''n '''S'''ilicon'') is a [[real time operating system]] (RTOS), created in about 1982 by [[Alfred Chao]], and developed/marketed for the first part of its life by his company [[Software Components Group]] (SCG). In the 1980s pSOS rapidly became the RTOS of choice for all embedded systems based on the [[Motorola 68000]] family architecture, because it was written in 68000 assembler and was highly optimised from the start. It was also modularised, with early support for OS-aware debugging, plug-in device drivers, [[TCP/IP]] stacks, language libraries and disk subsystems. Later came source-level debugging, multi-processor support and further networking extensions.

'''pSOS''' ('''''P'''ortablePortable '''S'''oftwareSoftware '''O'''nOn Silicon'''S'''ilicon'') 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, pSOS rapidly became the RTOS of choice for all [[embedded systemssystem]]s based on the [[Motorola 68000 series]] family architecture, because it was written in 68000 assembler[[assembly language]] and was highly optimised from the start. It was also modularised, with early support for OS-aware debugging, plug-in [[device driversdriver]]s, [[Internet protocol suite]] (TCP/IP]]) stacks, language [[Library (computing)|libraries]], and disk subsystems. Later came [[source- code]] level debugging, multi-processor[[multiprocessing]] support, and further networking[[computer network]]ing extensions.

In about 1991, Software Components Group was acquired by [[Integrated Systems Inc.]] (ISI) who further developed pSOS - now restyled pSOS+ - for other microprocessor families, by rewriting the greater part of it in C. Attention was also paid to supporting successively more [[integrated development environment]]s, culminating in pRISM+.

In about 1991, Software Components Group was acquired by [[Integrated Systems Inc.]] (ISI) whowhich further developed pSOS, -then nowrenamed restyledas pSOS+ -, for other microprocessor families, by rewriting the greater partmost 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+.

In July 1994, Integrated Systems acquired [[Digital Research]]'s modular real-time multi-tasking operating system [[FlexOS]] from [[Novell]].

In July 1994, Integrated SystemsISI acquired [[Digital Research]]'s modular real-time multi-tasking operating system [[FlexOS]] from [[Novell]].<ref name="pNDE"/>

In 1999 Integrated Systems Inc. was acquired by [[Wind River Systems]], the originators of rival RTOS [[VxWorks]]. Despite initial reports that pSOS support would continue, development was halted. Wind River announced plans for a 'convergence' version of VxWorks which will support pSOS system calls, and that no further releases of pSOS itself will be made.

In 1995, ISI offered a <code>pSOSystem/NEST</code> package for [[Novell Embedded Systems Technology]] (NEST).<ref name="Novell_1995_NEST"/><ref name="pNDE"/>

[[NXP Semiconductors]] acquired pSOS for [[TriMedia (mediaprocessor)|TriMedia]] from Wind River and continued to support this OS for the TriMedia VLIW core.<!-- but probably not after 2010, when the NXP's TriMedia group was terminated. -->

In 1999February Integrated2000, Systems Inc.ISI was acquired by [[Wind River Systems]], the originators of the rival RTOS [[VxWorks]]. Despite initial reports that pSOS support would continue, development was halted. Wind River announced plans for a 'convergence' version of VxWorks which will support pSOS system calls, and that no further releases of pSOS itself will be madeoccur.

[[NXP Semiconductors]] acquired pSOS for [[TriMedia (mediaprocessor)|TriMedia]] from Wind River and continued to support this OS for the TriMedia [[very long instruction word]] (VLIW) core.<!-- but probablyLikely not after 2010, when the NXP's TriMedia group was terminated. -->

==Migration away from pSOS==

In March 2000, rival company [[Express Logic]] released their EvacuationEvaluation Kit for pSOS+ users, designed to provide a migration path to its [[ThreadX]] RTOS.

During August 2000, MapuSoft Technologies Inc. came up with the pSOS OS Changer porting kit which can smoothly move the software to multiple OS such as [[Linux]], VxWorks, and more. It includes an ''[[integrated development environment]]'' (IDE) and ''application programming interface'' ([[API]]) optimization along with a profiling tool to measure API timing on target boards (www.mapusoft.com).

In August 2007, [[RoweBots]], a former partner of SCG and ISI, open sourced their pSOS+ compatible version called Reliant. It is available to all that wish to upgrade without applications changes.

In August 2007, [[RoweBots]], a former partner of SCG and ISI, [[open sourcedsource]]d their pSOS+ compatible version called Reliant. It is available to all that wish to upgrade without applicationsapplication changes.

The [[Xenomai]] project supports pSOS+ APIs (and others traditional RTOS APIs) over a Linux-based real-time framework to allow existing industrial applications to migrate easily to a GNU/Linux-based environment while keeping stringent real-time guarantees.

The [[Xenomai]] project supports pSOS+ APIs (and others traditional RTOS APIs) over a Linux-based real-time framework to allow existing industrial applications to migrate easily to a GNU/Linux-based environment while keeping stringent real-time guarantees.

Another open sourced alternative is [[RTEMS]], which has support for various APIs, including the "Classic API" (compatible to pSOS) and the POSIX API. Compared to GNU/Linux, RTEMS is a closer match to pSOS applications due to its lower memory footprint and its strict realtime behavior.

Another open sourced alternative is [[RTEMS]], which has support for various APIs, including the "Classic API" (compatible to pSOS) and the POSIX API. Compared to GNU/Linux, RTEMS is a closer match to pSOS applications due to its lower memory footprintsize and its strict realtime behaviorbehaviour.

== See also ==

Popular ''Secure Sockets Layer'' (SSL), now ''[[Transport Layer Security]]'' (TLS), libraries such as [[wolfSSL]] still support pSOS.

== See also ==

* [[FlexOS]]

* [[Novell Embedded Systems Technology]] (NEST)

* [[UNIX System V STREAMS]]

==References==

{{Reflist|refs=

<ref name="pNDE">{{cite web |title=pSOSystem and the NEST Development Environment - Designing Embedded Applications with NetWare Connectivity |type=White paper |publisher=[[Integrated Systems, Inc.]] (ISI) |date=1998 |url=http://www.isi.com/Products/pSOS/Networking/pNDE.html |url-status=dead |archive-url=https://web.archive.org/web/19980219173150/http://www.isi.com/Products/pSOS/Networking/pNDE.html |archive-date=1998-02-19}}</ref>

<ref name="Novell_1995_NEST">{{cite web |title=Novell Announces RTOS Vendor Program Which Brings Integrated Networking Solutions to the Embedded Systems Marketplace |type=Press Release |date=1995-05-23 |___location=Orem, UT, USA |publisher=[[Novell, Inc.]] |url=http://www.novell.com/news/press/archive/1995/05/pr00121.html |access-date=2018-08-18 |url-status=live |archive-url=https://web.archive.org/web/20180818184611/https://www.novell.com/news/press/archive/1995/05/pr00121.html |archive-date=2018-08-18 |quote="Because [[Novell]] used [[Integrated Systems Inc.|Integrated Systems]]' [[FlexOS]] during the development and testing of NEST, we are in the unique position of supporting it through both our real-time product lines pSOSystem for deeply embedded markets, and FlexOS for [[point of sale]]," said Moses Joseph, vice president of marketing for Integrated Systems. "Developers using the FlexOS development kit and the expanded pSOSystem/NEST package for everything from home security and entertainment to office automation and global communications applications, now have quick and easy access to the widest variety of standard networking protocols.}}</ref>

}}

==ExternalFurther linksreading==

* {{cite web|title=pSOSystem|last=|first=|website=|publisher=[[Integrated Systems, Inc.]] (ISI)|date=1998|url=http://www.isi.com/Products/pSOS/|url-status=dead|archive-url=https://web.archive.org/web/19980219171501/http://www.isi.com/Products/pSOS/|archive-date=1998-02-19|access-date=}}

* [http://www.rtos.com/news/detail/?prid=11 Express Logic announcement of their Evacuation Kit], retrieved 2007-06-13

* {{cite web |title=Express Logic announcement of their Evacuation Kit |url=http://www.rtos.com/news/detail/?prid=11 |url-status=dead |access-date=2007-06-13 |archive-url=https://web.archive.org/web/20070928131427/http://www.rtos.com/news/detail/?prid=11 |archive-date=2007-09-28}}

{{Real-time operating systems}}

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[[Category:Real-time operating systems]]

[[Category:1982 software]]