I have used this software, sometimes I do calculations and it does not seem to work, i just press enter and it calculates nothing.

Also is only particular variables allowed?

I tested this CAS software in particular along with Mathway, sometimes had similar answers and sometimes not?

For everyone who is downloading this:

This software uses Line-IO (Line), in particular. The answers are multiplied so for example: x+x=2*x

Run Matrix on the calculator has math and line. BUT this CAS however is Line, which you can select in run-matrix.

However, this is an definite pro compared to KhiCAS. Due to the less space. KHI-CAS takes more than 2000+ kb. And quite a lot. If you are running out of space like me, then this is the right option.

If you are having trouble with the software, then probably check the manual. I'd say that its an complicated software, but with practice, you will be a wiz at it.

My rating for this is around 8/10. Decent software. But improvements can be made.

If you're using a CG50, you should go to https://tiplanet.org/forum/archives_voir.php?id=1559596 | The port was made by gbl08ma by hardcoding the VRAM address in one function, which is fine for the CG10 and CG20, but the address is different for the CG50. Due to this, there are major visual problems with this version of Eigenmath on the CG50. gbl08ma left PRIZM development years ago. The new version found at the above link was most likely created by hex editing gbl08ma's add-in, and it displays fine. | Eigenmath is a great tool to greatly improve the PRIZM. Khicasen, another CAS port, has more functions and is more powerful in general, but Eigenmath is prettier and it automatically simplifies (Khicasen has trouble simplifying even with the simplify() function, and can crash when trying to simplify). Personally, I use both and I would recommend them both.