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Encyclopedia > PSOS
The title given to this article is incorrect due to technical limitations. The correct title is pSOS.

pSOS stands for plug-in Silicon Operating System. This real time operating system (RTOS) was created in about 1982 by Alfred Chao, and developed/marketed for the first part of its life by his company Software Components Group. In the 1980s pSOS rapidly became the RTOS of choice for all embedded systems based on 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.


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 environments, culminating in SNiFF+.


In 1999 Integrated Systems Inc. 'merged with' (in reality they were taken over by) Wind River Systems, the originators of rival RTOS VxWorks. Despite initial reports that pSOS support would continue, development has been halted. Due in the near future is a 'convergence' version of VxWorks which will support pSOS system calls, and it has been announced that no further releases of pSOS itself will be made.


  Results from FactBites:
 
PSOS - Wikipedia, the free encyclopedia (297 words)
The initial letter is shown capitalized due to technical restrictions.
According to some industry insiders, pSOS stands for plug-in Silicon Operating System but the official stance is that it is not an abbreviation, just a made-up word.
In the 1980s pSOS rapidly became the RTOS of choice for all embedded systems based on Motorola 68000 family architecture, because it was written in 68000 assembler and was highly optimised from the start.
Provider Sponsored Organizations: A Golden Opportunity in Medicare Managed Care - March 1998 Family Practice Management (2894 words)
PSOs may be developed as for-profit or not-for-profit entities of which at least 51 percent must be owned and governed by health care providers (physicians, hospitals or allied health professionals).
PSOs will need to meet minimum enrollee requirements (1,500 Medicare enrollees in urban areas; 500 in rural areas), but the HHS secretary may waive the requirement altogether during the first three years of a PSO's contract.
PSOs that are unable to meet the statutory requirements and fail to pass HCFA's annual audit of their operations may be shut down and fined.
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