Mesa and Smalltalk for the Alto are around [1], so I hope to get them running at some point. The files need to be copied into a disk image that the simulator can read, so I may need to write an Alto file system emulator.

Lisp for the Alto, on the other hand, seems to be entirely gone - I asked around and nobody seems to have a copy. From what I hear, it never worked very well because there wasn't enough memory.

[1] http://xeroxalto.computerhistory.org/Indigo/XMesa/.index.htm... and http://xeroxalto.computerhistory.org/Filene/Smalltalk-76/.in...