It has been several years since I used sas on mainframe, and many more since I did so through a mac os, but I remember using the following terminal emulator when I connected to the IBM 3270 mainframe we were using at the time.  It looks like it has been maintained through current versions os mac os too. http://www.brown.edu/cis/tn3270/ From windows I used to be fond of Reflections, but i do not this they make a version for mac.  One other that comes to mind is called ZOC, like Reflections though, is not a free software. ... View more