OS/400 topics

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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