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From the thread over on VCFED:
"The entirety of the PC/GEOS operating system, it’s SDK and apparently, ALL of it’s software, have been posted up on Git for community availability and further development !
It appears to be at least PC/GEOS 2.0 and possibly newer. Many files are dated 1991 and many have additional revision dates of “97/04/04 NewDeal” which is at least version 2.5 I believe.
You can find the Git repo here:"