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A predecessor of the AS/400, the System/36 PC was available in very similar chassis to the IBM AT. It used an IBM 5150 ( aka PC ) as the console with a special interface card.

Yeah, you're right. I made a perhaps bad/loose equivocation for System/38, which I think predates IBM PCs, to AS/400, which showed up in the late 80's.

... and they're still called LPARs today on the modern boxes :)

Correct and since 2007 LPAR's have been able to be xfered between hosts in a fashion similar to VMotion.

http://www.redbooks.ibm.com/redbooks/pdfs/sg247460.pdf

Additionally there are WPARs as well which are essentially application/workload management containers :-)

https://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/s...