Web site: |
Origin: Germany
Category: Workstation
Desktop environment: CLI
Architecture: Zilog Z80/Z8000, Motorola 68000, Intel 8086
Based on: Independent
Wikipedia: EUMEL
Media: Install
The last version | Released: 1.8.7 | 1990 1990

EUMEL (EUMEL “Extendable Multi User Microprocessor ELAN system” or L2/Liedtke 2) – a 16-bit operating system developed in 1979 by a team led by Jochen Liedtke at Bielefeld University.

Originally written for the Z80 processor, it was later ported to Intel architectures. There were also ports for the Z8000 (Olivetti M20), the Atari 520ST and the Commodore Amiga. Main concepts of L2 are its persistence and microkernel architecture. The successors to the L2 are L3 and L4.

L4 is a family of second-generation microkernels, used to implement a variety of types of operating systems (OS), though mostly for Unix-like, Portable Operating System Interface (POSIX) compliant types.

Orthogonal persistence means that in the event of a power failure, only a few minutes are lost and the system automatically resumes work at the last checkpoint. This highly effective protection mechanism was incorporated into the L3 (32-bit) operating system, which, among other things, was in use at TÜV Süd.

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