L2 (operating system)
L2 (also known as EUMEL " E xtendable multi U ser M icroprocessor EL AN system" known) is a 16-bit operating system , which by a team of around 1979 Jochen Liedtke at the University of Bielefeld was developed.
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 . The main concepts of the L2 are its persistence and the microkernel architecture. Successors to the L2 are L3 and L4 .
Orthogonal persistence means that if the power supply fails, only a few minutes are lost and the system automatically resumes work at the last test point. This highly effective protection mechanism was adopted in the L3 (32-bit) operating system , a. is in use at TÜV Süd .
literature
- Rainer Hahn: EUMEL user manual version 1.7 . Society for Mathematics and Data Processing (GMD) and Bielefeld University, University Computing Center , St. Augustin and Bielefeld 1984, DNB 210467444 .
- Jochen Liedtke: EUMEL system manual . Society for Mathematics and Data Processing (GMD), St. Augustin 1985, DNB 860673642 .
- Wolfgang Ambros: EUMEL practice. For beginners . tape 1 . Metzler, Stuttgart 1989, ISBN 3-476-30313-6 .
- Wolfgang Ambros: EUMEL practice. For programmers . tape 2 . Metzler, Stuttgart 1990, ISBN 3-476-30314-4 .
- Wolfgang Ambros: EUMEL practice. For users . tape 2 . Metzler, Stuttgart 1991, ISBN 3-476-30315-2 .
Web links
- https://6xq.net/eumel/ Information and links (English)
- EUMEL project on Github (German / English)
- http://www.computerwoche.de/heftarchiv/1983/17/1178576/ ( Memento from July 4, 2009 in the Internet Archive )