To activate these cheat codes in any PC port of DOOM, DOOM II or any PWADs running from them, simply type them in during gameplay.
IDDQD: God mode (Toggle)
IDKFA: All keys, all weapons, full ammo
IDFA: Full ammo
IDCHOPPERS: Chainsaw
IDSPISPOPD (Doom 1 and some ports of Doom II) or IDCLIP (some ports of Doom 1 and Doom II): No clipping mode (walk through walls) (Toggle)
IDBEHOLDL: Light Amplification Visor
IDBEHOLDR: Radiation Shielding Suit
IDBEHOLDI: Partial Invisibility
IDBEHOLDV: Invulnerability
IDBEHOLDA: Computer Area Map
IDBEHOLDS: Berserk
IDCLEVxy: Cut to ExMy (Doom 1) or MAPxy (Doom II)
IDMUSxy: Play music from ExMy (Doom 1) or MAPxy (Doom II)
IDMYPOS: Coordinates on map shown in bottom left-hand corner of screen (Toggle)
IDDT: Toggle Computer Area Map. Computer Area Map with locations of all weapons and monsters, normal map