Eumel

EUMEL, an acronym for Extendable Multi User Microprocessor ELAN System and also known as L2, is an operating system Jochen Liedtke created in 1979 at Bielefeld University, originally as a runtime environment for the ELAN programming language. It first ran on mainframes such as the Siemens BS2000 and later expanded to the Zilog Z80 and Z8000, the Motorola 68000 and the Intel 8086, supporting languages including BASIC, DYNAMO, LISP and Prolog along with application software such as the REMIS relational database and a word processor. More than 2,000 EUMEL systems were installed, mostly in schools, universities and legal practices, and its persistent architecture used a fixpoint and restart mechanism so that a crash or power loss cost users only minutes of work before resuming from the last saved state. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/