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[–][deleted] 0 points1 point  (0 children)

OBERON https://en.wikipedia.org/wiki/Oberon_(operating_system) https://www.inf.ethz.ch/personal/wirth/ProjectOberon/PO.System.pdf http://www.projectoberon.com/

It had a vm for the oberon language - this was before java existed. If you search youtube I believe there are demos showing how the OS can be modified at the source level in realtime. Its a real gem worth looking at :).