Trying to open the periodic table document on OS 1.7.2741 CAS yielded a ~"you need a newer OS version to open this file" message. Two parts of the file can contain versioning information (both probably do, directly or indirectly):
* the "TIMLP0500" header of the file;
* the contents of the Document.xml part of the file (which is compressed with the unspecified "0D" compression method, available only through yet-undocumented fiddling on nspire_emu/Ncubate).

Ok, what about 2.0.1 and 2.1? What I am also curious about is if the interpreter is actually present in the OS. Maybe the file format won't be read, but the language is there?

No, it's not present.

I also wonder if Lua programs for the Nspire will be compatible with the TI-Nspire CX?

I would assume so, since they even work in the computer software.

Thanks for the info Goplat.

Lionel that would be nice indeed, so we could run Lua games on older OSes too. As nice as this language discovery is, it sucks that it only runs on an OS that may never get to see Ndless.

I see. I hope they didn't water it down too much either.

Once Ndless works on OS 3.0, enhancing the Lua API will be quite easy.

After seeing "setColor" and "isColor" functions, I'm positive that Lua will work on the CX.

It does, it works on the CX emulator, so it really works.

Once Ndless works on OS 3.0...

You've found a way?