I have a TI-84PlusCE.

Any suggestions on how to get the source code for PlySmlt2?

Specifically, the PlySmlt2 app has an input for a 2-order polynomial where the user enters the coefficients and sign values for the equation. The entries appear to be a text box with darker background.

I need to know how to create the text box with darker background.

I'm using Python but Basic is a start.
TI's apps are written in C, not Python or BASIC. You could try applying to TI Education as a software engineer, although I don't think they're hiring. The only other option would be to hack into their corporate network and steal the source code. But they're definitely never, ever going to give it to you voluntarily, especially since nobody outside of TI can "legitimately" write C code for the TI-84 Plus CE.

On an actually-helpful note, you can get text with a gray background using TextLib.
DrDnar wrote:
nobody outside of TI can "legitimately" write C code for the TI-84 Plus CE.

Does that mean that it is illegal to write publicly available C programs, or does it mean that the CE C toolchain is completely removed from TI and the TI 84 PCE and its OS weren't built with the express purpose of encouraging outside toolchains?
Uh, the latter. Obviously.
Well, jackmanjls, not sure if this is what you wanted to do, but it would be a better long term move to learn C and use the many libraries for the CE C toolchain. C & C++ are more powerful, faster, and far more used than Basic ever will be (and is).
Here are some useful links to get started.

Link to the CE C toolchain: https://github.com/CE-Programming/toolchain/releases/tag/v9.1
Link to the CE C toolchain Documentation: https://ce-programming.github.io/toolchain/index.html
Link to the CE emulator (if you don't want to reset your calculator's RAM with a bug in your program): https://ce-programming.github.io/CEmu/
P.S. It would be advisable to take an actual C course before you start programming, instead of just looking at the examples and getting confused.
randomguy...this is the start of what I want.
I was under the idea that the PlusCE only supported Basic and Python.
For user programs, yes, only TI-BASIC and Python are officially supported.
In TI's apps, they can use assembly and C. However, they don't release the source code for their apps, and unlike BASIC or Python it's not really possible to get the source code given the program.
Unofficially (using exploits) you can also use assembly, C, and C++, as well as any other language that targets LLVM - see the links that randomguy wrote above.
jackmanjls wrote:
randomguy...this is the start of what I want.
I was under the idea that the PlusCE only supported Basic and Python.

Glad to hear it! C is definitely the best language to use for almost any major program on the TI-84 Plus CE! Also, if you haven't used C before, the course here at Edx.org is pretty good (in my opinion at least; I have only been using C for 5-6 months intermittently): https://www.edx.org/course/c-programming-getting-started?index=product&queryID=1d79b0085114713429bd037cb6c39262&position=3
  
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