A History of Programming Games 1961-1989
retroprogramming.com
retroprogramming.com
Slightly off topic: it's not retro, but I have written and am currently playing with again writing homebrew for the GameCube, which is awesome fun :)
It's still cool to read.
Moreover, Robotwar inspired a forth-like clone called Grobots: http://grobots.sourceforge.net/
The complexity of it was mind-boggling, especially for a console game. The instruction manual was hundreds of pages.