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A lot of this goes back to the System/3, which was released in 1969.

System/3 => System 32 => System 36 => System 38 => AS/400 => iSeries.

Well, only sort of. The 38 was a radical departure, and is the the true root of this series.

Chronologically, it was actually S/32 => S/34 => S/38 => S/36. Though S/36 was more a successor to S/34, built on more modern hardware but didn't really offer anything new in terms of OS architecture.

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