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

Revision as of 14:30, 27 April 2022

Latest revision as of 20:12, 1 September 2024

(4 intermediate revisions by 3 users not shown)

Line 1:

{{Short description|None}}

{{Lowercase|title=pSOS}}

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

Line 4 ⟶ 5:

{{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 latest release date = <!--{{Start date and age|20202007|08}}-->

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

| programmed_in programmed in = 68000 [[assembly language]]

| language = English

| update model =

| package manager =

| package_manager =

| working_state working state = Discontinued

| license = [[Proprietary software|Proprietary]]

| website =

}}

'''pSOS''' ('''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, pSOS 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+.

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

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

In February 2000, Integrated 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 will occur.

[[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==

Line 44 ⟶ 45:

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 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 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 Linux, RTEMS is a closer match to pSOS applications due to its lower memory footprintsize and its strict realtime behaviour.

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

== See also ==

* [[FlexOS]]

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

* [[MapuSoft Technologies Inc.]]

* [[UNIX System V STREAMS]]