Doom

PC

Code		Effect

IDDQD		God mode
IDKFA		All weapons and ammo
IDFA		Weapons but no keys
IDCHOPPERS	Chainsaw
IDSPISPOPD	Walk through walls
IDMYPOS		Coordinates (in hexadecimal) 
IDDT		Map toggle
IDBEHOLD	Cheat Menu
IDBEHOLDA	Area Map
IDBEHOLDV	Temporary invulnerbility
IDBEHOLDI	Temporary invisibilty
IDBEHOLDL	Light amplification visor
IDBEHOLDS	Berserk Mode
IDBEHOLDR 	Radiation suit
IDCLEV##	Skip to episode #, level #
IDMUS##     Change music to indicated level   

Thanks to Revolution readers John, Notorious B.O.B, Troy Amsom, Adrian, Freddie Naylor-Leyland, Cooper, Daniel Richter, The Elf, and George Tsantrizos!!