GameShark Codes for:

Doom

Effect                                   Code

Must Be On [M]                           CBBF5A140767CAD6
                                         CDAD2A829BEE4132
 
Infinite Bullets                         2A442D4BCD93CB86

Infinite Shells                          EBEB422A264E5A81

Infinite Cells                           DFA4DC6CADBC404B

Infinite Rockets                         F123FA07FE1E26B4

Infinite Armor                           A579CE28BFF0AE95

Have Blue Key                            BF76B3C91BCA9F4D

Have Yellow Key                          95D6D77DA71423DE

Have Red Key                             350837EE37D1CD2A

Have Shotgun                             A4E9F5B15051A549

Have Chaingun                            019C50AE7C44F22B

Have Rocket Launcher                     62F84B837FDBF176

Have Plasma Gun                          1361EFA8C09416BB

Have BFG 9000                            644330F3C7926AB4

Have Chainsaw                            54BB29529D9DA348  

Have Radiation Suit                      00DFFD1940C50DBC