Software:Ancient UNIX

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Short description: Early releases of Unix operating system
Version 5 Unix for the PDP-11, running on SIMH
Version 6 Unix for the PDP-11, running in SIMH
Version 7 Unix for the PDP-11, running in SIMH

Ancient UNIX is any early release of the Unix code base prior to Unix System III, particularly the Research Unix releases prior to and including Version 7 (the base for UNIX/32V as well as later developments of AT&T Unix).

After the publication of the Lions' book, work was undertaken to release earlier versions of the codebase. SCO first released the code under a limited educational license.[citation needed]

Later, in January 2002, Caldera International (now SCO Group) relicensed (but has not made available) several versions under the four-clause BSD license, namely:[1][2]

(As of 2022), there has been no widespread use of the code, but it can be used on emulator systems, and Version 5 Unix runs on the Nintendo Game Boy Advance using the SIMH PDP-11 emulator.[3] Version 6 Unix provides the basis for the MIT xv6 teaching system, which is an update of that version to ANSI C and the x86 or RISC-V platform.

The BSD vi text editor is based on code from the ed line editor in those early Unixes. Therefore, "traditional" vi could not be distributed freely, and various work-alikes (such as nvi) were created. Now that the original code is no longer encumbered, the "traditional" vi has been adapted for modern Unix-like operating systems.[4]

SCO Group, Inc. was previously called Caldera International. As a result of the SCO Group, Inc. v. Novell, Inc. case, Novell, Inc. was found to not have transferred the copyrights of UNIX to SCO Group, Inc.[5] Concerns have been raised regarding the validity of the Caldera license.[6][7]

The Unix Heritage Society

The Unix Heritage Society was founded by Warren Toomey.[8][9][10][11][12][13][14][excessive citations] First edition Unix was restored to a usable state by a restoration team from the Unix Heritage Society in 2008. The restoration process started with paper listings of the source code which were in Unix PDP-11 assembly language.[15][16]

References

  1. ↑ Johnson II, Dion L. (2002-01-24). "Liberal license for ancient UNIX sources". http://www.lemis.com/grog/UNIX/. 
  2. ↑ Broderick, Bill (January 23, 2002). "Dear Unix enthusiasts". Caldera International. http://www.tuhs.org/Archive/Caldera-license.pdf. 
  3. ↑ Singh, Amit (August 2004). "UNIX® on the Game Boy Advance". http://www.kernelthread.com/publications/gbaunix/. 
  4. ↑ "The Traditional Vi". http://ex-vi.sourceforge.net/. 
  5. ↑ "10th Circuit Court of Appeals Decision". http://www.groklaw.net/pdf3/SCOvNovell10-4122.pdf. 
  6. ↑ Warren Toomey. "The Push to Get Free Unix Licenses". https://wiki.tuhs.org//doku.php?id=events:free_licenses. 
  7. ↑ "Why BSD/OS is the best candidate for being the only tested legally open UNIX.". https://virtuallyfun.com/wordpress/2018/11/26/why-bsd-os-is-the-best-candidate-for-being-the-only-tested-legally-open-unix/. 
  8. ↑ "Interview with Warren Toomey, Founder of the Unix Heritage Society" (in en). 13 January 2023. https://www.usenix.org/publications/loginonline/interview-warren-toomey-founder-unix-heritage-society. 
  9. ↑ Davis, A. Jesse Jiryu (June 14, 2017). "Assembling the history of Unix". LWN.net. https://lwn.net/Articles/725297/. 
  10. ↑ Jude, Allan (October 13, 2022). "Warren Toomey interview". https://www.bsdnow.tv/476.  MP3 44:34
  11. ↑ Chirgwin, Richard. "Samizdat no more: Old Unix source code opened for study" (in en). theregister.com. https://www.theregister.com/2017/03/30/old_unix_source_code_opened_for_study/. 
  12. ↑ "Warren Toomey : contributions". https://www.researchgate.net/scientific-contributions/Warren-Toomey-51052769. 
  13. ↑ "SCO may not know origin of code, says Australian UNIX historian" (in en). The Sydney Morning Herald. 9 September 2003. https://www.smh.com.au/technology/sco-may-not-know-origin-of-code-says-australian-unix-historian-20030909-gdhd04.html. 
  14. ↑ Toomey, Warren (2010). "First Edition Unix: Its Creation and Restoration". IEEE Annals of the History of Computing 32 (3): 74–82. ISSN 1934-1547. https://muse.jhu.edu/article/394148. Retrieved 15 June 2023. 
  15. ↑ Toomey, Warren (July 2010). "First Edition Unix: Its Creation and Restoration". IEEE Annals of the History of Computing 32 (3): 74–82. doi:10.1109/MAHC.2009.55. 
  16. ↑ The Restoration of Early UNIX Artifacts

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