This is a copy of original A2 Repository (defunc) at ETH-Zürich, which should be available (as of March 2024) at its newer place at ETHZ.
The stuff available here is a coopy of the former SVN repository; it was obsoleted by metacore's active, but unoffical mirror copy of a2, which is updated regularily (at least afaik). The repository here was handed over to me by github user Ignat99 in October 2017; I had intended to do the same as metacore (synchronize the git repository with the subversion repository), but I found metacore's repo some time later and since I did not want to duplicate metacore's achievement, I did not follow up my original idea.
Ignat99 had enriched the original mirror by other interesting stuff, especially:
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Extra ISO image A2_Rev-6498_serial-trace.iso which originally I had created and provided quite some time ago on SourceForge. Sorrily I encountered problems in creating the ISO images, which I was unable to resolve, so there are no images after Revision 6498.
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Stuff for MacOSX (Darwin) - UnixAos
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Extra Modules for A2 - subversion community repository (defunc) which moved inside the new repository
More information about A2 OS can be found in Wikipedia, the Oberon Wikibook, and in the A2 user guide, which is slightly outdated and was originally created by André Fischer (afaik). An archived version of the Oberon Community wiki at archive.org provides some more usefull information.
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Russian forum Active Oberon & A2 (Bluebottle)