If  you  pause  the game and you should find that you are able to
move your gun target around.

     For infinite lives in this game, use the DOS utility DEBUG. First
backup  your  game  to be edited, then type the following from the DOS
prompt:

ren gitum.frm cheater.cht
debug cheater.cht
e 3a6 c6 6 c0 85 c3 ff 2e 1f 0
Then type:
w
q

     Then rename CHEATER.CHT back to its previous name.