Brian Silverman, who has done some miraculous "bringing back software to life" (and some HW as well), has always wanted to do this. The problem here is partly

Brian Silverman, who has done some miraculous "bringing back software to life" (and some HW as well), has always wanted to do this. The problem here is partly that no one is quite sure "which" TX-2 has to be emulated, and, worse, where to find the specs. The machine was a research computer and constantly tinkered with, including changing instructions and formats. Also, Sketchpad was written in a macro-assembler (Coral) which was idiosyncratic to say the least. But I would advise contacting Brian to chat about this...