Eumel

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Eumel (pronounced oimel) is an operating system which began as a run-time environment for the Elan programming language. It was created in 1979 by Jochen Liedtke at the University of Bielefeld. Eumel initially ran on the Z80 processor, and was later ported to many different architectures.

One of the main features of Eumel was that it was persistent and had a microkernel architecture. Persistence in this case meant that if the power failed you would only lose a couple of minutes of work, and upon startup you would continue working from the previous fixpoint. This is also known as orthogonal persistence. Eumel was followed by L3 and later BirliX.