[GrantSolar]

For anyone interested in the inner workings of Doom[1], I can't recommend Fabien Sanglard's blog enough. He also released a book on Wolfenstein 3D which goes into tremendous detail on the code, company, and hardware of the time.

[1] http://fabiensanglard.net/doomIphone/doomClassicRenderer.php

[coldacid]

He's actually working on a companion book covering the Doom / id Tech 1 engine now, too.