Money Cheat - Hex
     Open  up  your save game file into your favorite hex editor, then
go to offset 207340 and 221132 and change those values to FF FF FF

Various Cheats
     Type  in  tarmac to enable cheats, then type any of the following
"Codes":

Code              Effect 
chrisedwards      All Weapons 
arloeisenberg     Full Life 
bhardin           Invincible Barriers