Hello! Unfortunately, I do not have any source code for the Casio Prizm fx-CG500. However, there are many resources available online where you can find source code and programming tutorials for this calculator.
One good place to start is the official Casio Education website, which offers various resources and tutorials for programming on the fx-CG500. You can also search online forums and communities dedicated to programming on Casio calculators, such as Casiopeia or Omnimaga.
Additionally, there are many programming languages and tools available for the fx-CG500, including C, Python, and Lua. Depending on what you are trying to accomplish, you may want to explore these options and see which one best fits your needs.
I hope this helps, and good luck with your programming endeavors!