For cheats in this game, use the DOS utility DEBUG. First backup your
 game to be edited, then type the following from the DOS prompt:
 
 ren fire.exe cheater.cht
 debug cheater.cht
 For invulnerability, type:
 e 30cb eb 8
 For infinite magic,
 type:
 e 201a 90 90 90 90 90 90
 Then type:
 w
 q
 
 Then rename CHEATER.CHT back to its previous name.