This is the best cheat I've found for Sim City 2000.  

It will give you all technologies, rewards, and $500,000.  

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First type VERS to see what version of Sim City 2000 you have.
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Version 1.0:

1) Pause the game to avoid being interrupted by something.
2) Press Ctrl-F3
3) Click on the Rotate Counterclockwise icon.
4) Click on the Status Window
5) Click on the Population icon
6) Click anywhere inside the City Window
7) Pull down the disasters menu and select the horizontal line between Riots
   and No Disasters.

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Version 1.1

Just type TORG.

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Provided by:

Funky Monkey

e-mail:  monkey@citynet.net
WWW homepage:  http://www.citynet.net/personal/monkey/index.html