The program was MAC HACK VI. This link doesn't give access to the program, but it may give you some leads about where to find it. It was a chess playing program, and a good one for its time frame. https://chessprogramming.wikispaces.com/Mac+Hack
Also, here's a link to pdp- TECO. The best text editor around in 1965. This link does have a Download button, which I have not tried.
https://dspace.mit.edu/handle/1721.1/5917
You might also want SHRDLU, a language understanding prgram written by Terry Winograd. You can get it here:
http://hci.stanford.edu/winograd/shrdlu/
Trouble is, you'll also have to get MacLisp in order to run it.