Codes:
imacheat $500,000 and all rewards
priscilla debug menu with various options
gilmartin Get Army Base
noah flood
moses stops flood
fund Get a fund from Mayor
joke shows a picture
cass get $250 but get a 15% chance of fire
ardo Get $500,000
gomarrah nuclear Meltdown
buddamus $500,000 & Rewards

Another well known trick is the FUND bug. Start a new city but before you do anything, type FUND. The banker will ask you if you want a bond at a 25% rate. Say Yes. Now type FUND again, and get another 25% bond. Now go to your budget window, click on bonds, and issue another bond. The new bond will have a rate of .%. percent, which is where the bug in the program is. This bug will give you $1.5 million every January 1st. Enjoy!