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Astrobe - Oberon Language

The Oberon Programming Language

Oberon is a general-purpose, procedural programming language. Its type-safety and module consistency-checking features facilitate the development of secure and reliable software. Oberon includes low-level features that make it particularly suited to the development of real-time applications on ARM microcontrollers.

In addition to the usual range of programming language facilities Oberon features include:

  • Type-extension capabilities
  • Assertions
  • Automatic array index checking
  • IEEE Standard format REALs
  • Version consistency and type-checking across modules
  • Read-only access to external variables
  • Optional read-only access to parameters
  • Nested procedures
  • Nested comments

Recommended Reading

These documents are included with all editions of Astrobe:

  • The 2013 Oberon Language Report by Prof Niklaus Wirth (81 KB PDF file. 17 pages)

    The complete official definition of the Oct 2013 / Mar 2014 Revision of the Oberon language.


  • Oberon Syntax Diagrams by CFB Software (110 KB zipped Windows CHM Help file)

    A cross-referenced, quick, visual summary of the Oberon language syntax.

These documents are included with the relevant edition of Astrobe:



The following books are general Oberon programming texts which include numerous documented source code examples. Most of the OS-independent procedures should compile without modification using Oberon.

  • Algorithms and Data Structures - Oberon Edition by Niklaus Wirth (1.2 MB PDF file. 179 pages)

    Many useful general programming examples - sorting, searching, linear lists, recursion, tree  structures, hashing functions etc. All of the source code is presented in Oberon.

  • Programming in Oberon by Niklaus Wirth (327 KB PDF file. 65 pages) 

    An introduction to programming in general, and a guide to programming in the language Oberon in particular. Note that the 2011 Revision has some differences from the original version of Oberon described here.
  • Project Oberon - The Design of an Operating System and Compiler by Niklaus Wirth and Jürg Gutknecht (4.2 MB PDF File. 441 pages) 

    A complete case study of the implementation of an actual operating system with a graphical user interface for workstations. The Oberon source code for the entire system, including the file system, windows and graphics management, editor, compiler, linker etc. etc. is included.

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