Feynman Lectures on Computation

I recently discovered that Feynman had given lectures on computation. I thought this might interest hacker news, as they are well written, in a conversational style.

Most importantly, I believe that chapter 5 on reversible computation and the thermodynamics of computing presents the spirit of the work done by Feynman while he was at thinking machines. This addresses a topic which often comes up on hacker news: how did Feynman use differential equations to describe a binary system?