Although this doesn't have that much to do with the link this topic is referring to, this is something we really could learn from:
DOOM ATTACK SOURCE CODE!!!
http://www.filedropper.com/dasource(Thanks to Mick for getting ahold of this and releasing it)
After years of thinking it was lost forever, here it is in all its glory, the most highly optimised Amiga source port of Doom in the raw!
