I loved playing Creatures 3, an ancient game (1999) with some basic neural nets. I'm surprised that ML isn't a bigger deal in virtual pets today!
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I'm impressed how often ancient elisp code just works. For example, here's some Smalltalk narrowing from 1991!
Wonderful post on the ancient PC that jwz worked on (including writing the Emacs byte compiler!)
Woah, even in 2010, a license for OpenGenera (ancient lisp machine software) costs $5,000 to run on a single CPU! https://www.lispmachine.net/symbolics.txt