Hi.  I have a problem with my TI-Nspire memory.  I contacted Texas Instruments about this 2 weeks ago and the person who answered my question said they had the same problem with their TI-Nspire, but they did not know the problem.  The e-mail said they would contact another department to find an answer, but I have not received a response.  My memory status screen shows that 14.1 MB of my memory is being used, but I only have 143 KB in my documents (both screen shots are attached).  Does anyone know what causes this problem?  If anyone wants to see my response from TI, I can post if here, and if no one knows what causes this, I will contact them again.  Thanks!

I always noticed on my Nspire sometimes I appear to have a lot of missing memory. I wonder if it's being used by the TI-OS?

Well it's understandable that people would think of the Nspire as a calculator considering it was released for use in classes like calculator mostly. You have to understand that. It's more of a computer but no need to bash people who call it a calculator or make them feel bad, especially when you are new to the forums (it could make people get a bad opinion of you since we do not condone rudeness here). Plus, the older TI calcs are almost computers now anyway. You can do more than the 4 operations, you can play games and even the TI-BASIC language, despite not being designed for games exclusively, still give us game functions. They can even be turned totally into computers if someone makes a custom OS.

I did not know TI used someone else's OS (Nucleus) for the TI-Nspire, though. I was sure it was their own . Not only they try to hinder us with DMCA notices and can't fix their old calc OSes bugs, but now they can't even write their own OS for the Nspire

I think this is happens on all calculators. All the examples in various languages, and the OS, take up ROM space.

In the screenie from the post, the "memory" shown on the Nspire is the addition of RAM+ROM (I have no idea why they added them together, but never mind).

I'm not sure that you are looking at the memory hierarchy the right way although this seems to make sense because of how TI has done there previous calculators but none the less the N-spire is a huge departure from previous calculators as TI advertises it's more like a computer and that goes for both inside and out.
The N-spire believe it or not has a boot strap,a kernel, hardware abstraction, and the works.  In fact I'm not even sure that it is single core any more (it may have multiple processors) but I digress.
I do not have time to post a full description of how the N-spire works from a hard where stand point but I will say that there is 32MB of flash memory (used like a hard disk) and you are seeing that minus the partitioning and file system overhead. (likely FAT)
To understand fully the gigantic departure from TI's norms you can compare a cell phone to a desktop computer. the N-spire is the OS it runs is called Nucleus RTOS.
heres the wikipedia http://en.wikipedia.org/wiki/Nucleus_RTOS
and here's a useful page of features http://www.mentor.com/products/embedded_software/nucleus_rtos/

you are using the n-spire cas not the n-spire

I did not know TI used someone else's OS (Nucleus) for the TI-Nspire, though. I was sure it was their own . Not only they try to hinder us with DMCA notices and can't fix their old calc OSes bugs, but now they can't even write their own OS for the Nspire

nope they not only use someone else's OS they also use:
an open source project for their encryption (openSSL)
another open source project for their compression of tns files (zlib)
a third for xml parsing (eXpat)
and their gui concepts are based on Fathom Dynamic Data. (at least that is the impression i get)

goto settings->handheld status->about and it tells you all this stuff

I personally think its a gift for them to be using libraries we can see the source code of because it can give us a better understanding of how the calculator works and how to crack it.  because we know what has to be in the OS so we don't have to guess how they did things.

agreed I haven't really used Ndless because my programs exploit a lot of the changes in behavior since OS 1.4 in order to work.  little things that make me able to do more with less in N-spire basic.