Hello MMOwned!
I have managed to find the old Antrix/Ascent source (from 2007) that I downloaded a while back, just before the SVN was removed, hoping to keep Antrix alive as it is my favourite Emulator. I believe these support Patch 2.1 .
Currently, I am in the process of patching Antrix... slowly, with my none-existent C++ skills in another public project called OpenAntrix (original, no? ) This can be found at www.openantrix.com
Antrix r800 src: http://dl.dropbox.com/u/7593356/antrix-src.rar
Ascent r841 src: http://dl.dropbox.com/u/7593356/ascent-src.rar
Hope these can be of use to someone, sometime