See Bruce Lee Lives Cheat-code here!

Infinite Health

First backup your game, then, using the DOS utility DEBUG, type the
following at the DOS prompt:

  ren bruce.exe cheater.cht
  debug cheater.cht
  e 717a 90 90 90 90
  e b1b2 90 90 90 90 eb
  Then type:
  w
  q
                                        
  Then rename CHEATER.CHT back to its previous name.