Note: This is an alternate USA version of Doom (presumably a minor bug fix). If the Doom codes above
won't work, try these ones...

Invincible:
 800A881C 0001
 800A8814 0001
 800A8810 0064

Mega rapid fire!:
 800A88e0 0001

Unlimited bullets:
 800A8884 0064

Unlimited shotgun shells:
 800A8888 0064

Unlimited rockets:
 800A8890 0064

Unlimited plasma:
 800A888C 0064

Have shotgun:
 800A8868 0001

Have double-barrel shotgun:
 800A886C 0001

Have chaingun:
 800A8870 0001

Have rocket launcher:
 800A8874 0001

Have plasma rifle:
 800A8878 0001

Have BFG:
 800A887C 0001

Have chainsaw:
 800A8880 0001

Have red key:
 800A8834 0001

Have blue key:
 800A8838 0001

Have yellow key:
 800A883C 0001

Night vision on:
 800A8830 0001

Turn on level map:
 800A882C 0001

More light:
 800A8832 0001