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  3. June 2006

Re: OS/400 topics

OS/400 *is* mainstream, with a heritage going back to at least the 1970s, and arguably well before. It is perhaps the only true descendant of the Hollerith card. OS/400 is an integrated application & data base, including security, communications, development, and back-up/system recovery all included in the package.
One of the reasons for the challenges you are facing with finding the information you asked for is that the developers and end users are insulated from much of what you are asking about. There is no need for customers, developers, and users to know; there is no business advantage in knowing much of what you ask for.
I am greatly simplifying, and in doing so I am doing a disservice to both Apple and IBM, but the IBM midrange platform is tightly integrated and is provided as a business solution, for businesses to do their back office work on time and with controlled costs. This is much the same philosophy that I believe Apple uses with their product line?
This response is greatly simplified but just because these answers are simplified don't construe this midrange platform as degraded or out dated.
Others will tell you the details I am sure, but as the rest of the industry struggles with 64-bit technology, you should realize we are moving toward 128-bit technology. We have been fully 64-bit for several years now; this includes both the operating system (including the data base) and *all* of the applications. No other commonly available platform can boast that so far as I know?
I hope I haven't made any bonehead remarks, but if I have someone will set you straight. Good luck. 


N W wrote:

Hello, I'm looking for technical data on the OS/400.
I would like to know how does it compare to mainstream OS, if it is a batch processing system or interactive, and a little bit about his heritage. Some of the information that I need deals with the Name and type of Kernel, Process Scheduling, Scheduling Algorithms and Policies (Pre-emptive, Non Pre-emptive), Critical Sections, Mutex and Semaphores, Managing Tasks and how they are applied into OS/400. It is a real challenge to find information on these topics. I only know that QJOBSCD is the Job Scheduler. I have already e-mailed IBM and received an uncomplete answer. I know it is very difficult (almost impossible) to have some of this information. However, it would be very appreciated if you can at least answer one of these questions, or refer me to someone who knows about it. You are one of my last hopes. Thanks very much to anyone that answers, N. Wong _________________________________________________________________ 
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