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This is your chance to find out what really is going on inside your AS/400. Everything you have always wanted to know. You won't find this out from anywhere else. It will satisy the appetite of even the most technically minded. There's even an historical perspective - the AS/400 really does come from an alternative universe. Fantastic.
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As a former IBM developer for Enterprise Systems, I can detect/identify with some of the historical happenings. Be nice if there were more anecdotes. In a way, I'm sorry GSD wasn't spun off during the anti-trust era with a pile of cash and allowed to fullfill the dream.
The author does point out one of the virtues of Rochester Development -- very few ideas and people can be traced back to the early days at MIT of Eniac and Multics. This branch of computer history and the AS/400 unique architecture need preservation!
System/38 - AS/400 architecture is important because it gets incredible interactive performance out of low power hardware, and should be part of any architect or designer's education.
The secret is that everyone shares everything -- addresses, data, programs -- in a huge space that persists forever. Players are vetted at two levels before being let onto the playground, and only one hardware check (against pointer corruption) is needed to guarantee security. Because it's all one space, there is never a context switch that will purge hardware caches or replace hardware tables. Switching between users is trivial and without the performance penalty paid in any Virtual Machine or multiple address space system. Because it's persistent, there is no garbage collection (though cleanup done at each boot can make restarting take a while).
The programming cost for all this is double compilation using (some IBM controlled) tools designed for application programming, relational data base, transaction processing, client/server, and object orientated. Anything wanting intimacy with the hardware (think Diablo or WoW) is not a good program to get running on an AS/400!Read more ›
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Did you ever wonder about why IBM is pushing JAVA? Worried about the future of the AS/400? Concerned about personal computers or PC servers that have faster cpu speeds than an iSeries? You must read this book then! Only Frank Soltis could provide the highly readable in depth analysis of the internal architecture that appears to becoming the basis for the entire eServer line of computers to be built by IBM in the future. For many of us who have invested heavily in the AS/400 and are worried about its future this book should put those fears to rest and demonstrate clearly how this amazing machine and its even more incredible layered operating system will be the basis for IBM's future! Bob C.
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