All Points Bulletin 

First backup your game, then, using the DOS utility, type the following at 
the DOS prompt:
ren apb.exe cheater.cht
debug cheater.cht

Then for infinite lives, type:
e 14fe 90 90 90 90

For stop timer, type:
e 725 90 90 90 90 90

For infinite health, type:
e 72a 90 90 90 90 90
Then type:
w
q
Then rename CHEATER.CHT back to its previous name.