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by sillywalk 1057 days ago
As an amateur OS nerd by 'exploring' do you mean use or read about or both? :)

You can get free access to play around on an IBM i (aka AS400/iSeries/i5) here [0].

Archive.org has (for the moment) Inside the AS/400 [1] by Frank Soltis. He was the father of the System/38 /AS400, and also worked on the Cell processor. I haven't read this edition, but I did read the following edition called 'Fortress Rochester', and it is a good and detailed overview of the system - history, design choices, and hardware/software. As for RPG, it was made to be familiar to punch-card operators/programmers so they could switch to a 'real computer'.

bitsavers has a lot of info [2]. A tech report on the Tandem Nonstop Guardian OS / system [3] was interesting.

[0] https://pub400.com/

[1] https://archive.org/details/insideas4000000solt

[2] https://bitsavers.org/pdf

[3] http://bitsavers.org/pdf/tandem/technical_reports/TR90-08_Gu...