A free book explains Tempest by reading every line of the source code

TEMPEST vs TEMPEST is a free book about two of the strangest-looking arcade games ever made. The first is Dave Theurer’s Tempest from 1981, the Atari cabinet where you spun a metal knob to rotate around the rim of a glowing geometric tube, shooting spiders and flippers as they crawled up toward you. The game was drawn with bright neon lines on a black s…