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 e:\alien.exe cheater.cht
 debug e:\cheater.cht
 For infinate lives, type: e e1ae 90 90 90 90
 To Stop The Timer, type: e b8be 90 90 90 90
 w
 q

 Then rename CHEATER.CHT back to its previous name.