hi
You can download a shareware simulator from this site 8052.com and try to download another simulator for evaluation. If you like it you can purchase it.

The simulator name is UMPS, Universal Microprocessor programmer simulator.

See at www.wirz.com

or

http://idls.izarbel.tm.fr/entp/techer/index.htm

You can simulate even LCD panels etc with UMPS.

Try it and let me know how you find it.

Goodluck

Rauf