Linked by moondevil on Wed 11th Jul 2012 22:49 UTC
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Member since:
2008-12-10
Ok, I found the answer to my own question ;-)
http://www.appleinsider.com/articles/08/10/28/road_to_mac_os_x_snow...
Mac OS X loads the same kernel image and run it as a 32-bit process, although when run on 64-bit hardware, the 32-bit kernel switches into "long mode compatibility mode."
Still it sounds like magic - I thought in machine code you have to be very specific about 32 or 64bit.