Hexcheat:
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 go to offset "00001B1E" for doubling your money, ex: 
 - 0E for 250.000
 - 1E for 500.000
 - 2E for 1.000.000 
 
 once time editing : go to offset "00001B1F" replace "41" 
 or whatever value to "43".(it seem that "43" is the 
 maximum value for offset "00001B1F")
 
 The UPDATE (97-98) VERSION
 go to offset "00001A9E" for doubling your money do 
 as above (original version) offset "00001A9F" and do