The following are known GameShark Codes for Doom on Sony Playstation (PS1).

• Have All Guns (GameShark 2.2 or Higher)
  50000704 0000
  800a8648 0001
• Have the Map
  800a860c 0001
• Have the Blue Key
  800a8618 0001
• Have Red Key
  800a8614 0001
• Have the Yellow Key
  800a861c 0001
• Have the BFG
  800a865c 0001
• Have the Chaingun
  800a8650 0001
• Have the Chainsaw
  800a8660 0001
• Have the Double-Barrel Shotgun
  800a864c 0001
• Have the Plasma Rifle
  800a8658 0001
• Have the Rocket Launcher
  800a8654 0001
• Have the Shotgun
  800a8648 0001
• Infinite Ammo (GameShark 2.2 or Higher)
  50000404 0000
  800a8664 0064
• You Are Invincible
  800a85fc 0001
  800a85f4 0001
  800a85f0 0064
• Mega Rapid Fire
  800a86c0 0001
• Unlimited Bullets
  800a8664 0064
• Unlimited Plasma
  800a866c 0064
• Unlimited Rockets
  800a8670 0064
• Unlimited Shotgun Shells
  800a8668 0064