L2 (operating system)

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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 .

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