#LISP Machines

The full narrative of AI's second great contraction — told from the inside, through the experiences of the researchers who built the boom and watched it collapse. The collapse of the expert systems industry, the dissolution of the LISP machine market, the reduction of DARPA funding, and the underground movement that kept the neural network approach alive through the cold.

The expert systems boom collapsed almost as quickly as it had risen. The LISP machine market imploded overnight. DARPA cut funding. And for the second time in AI's history, the field contracted, researchers left, and the most pessimistic observers began to wonder whether the project was fundamentally misguided. The full story of AI's second near-death experience — and the underground movement that kept the neural network flame alive through the cold.