Halo 3 Terminals
As per the hint given by Terminal.jpg from Server 05, Halo 3 contains 7 terminals scattered throughout the Forerunner structures. While not necessary to complete the game, finding all 7 unlocks the Marathon Man achievement worth 40G.
These terminals also give more clarity and continuation to the backstory that began in Iris about the Forerunner firing of the rings 100,000 years ago, as well as events that happen during the video game.
Below are listed each Terminal, location, and transcribed log text from within each. Note that these pages do contain spoilers if you wish to find them yourself. The terminals also have alternate content when playing the game on Legendary (and much more interaction with our Mendicant Bias
Proceed with caution!
- Great outline of the Terminals and Halo storyline, posted by Mr.Vociferous at AscendantJustice.com