My TI-89 Titanium came preloaded with language localization apps- German, French, and Spanish. I assume all Titaniums do.

I don't speak either of these languages (I'm a native English speaker), and since combined they take up a reasonably large amount of space, I decided to delete them to give me more memory.

I deleted the German app- and found my calculator was locked up. I did a RAM reset (using ON+2ND+LEFT+RIGHT) reinstalled KerNO, and used Stefan Heule's backup utility to restore my settings, and now the calculator appears to work fine.

My question is this: is my calculator unstable now without it? Can I do the same for the other language localization apps? I can deal with the crashes easily enough, but if what I'm doing is leaving my Titanium unstable, I'll send the German app back to my calc.

I deleted all of my lanugage apps and it works fine.  I can't see any reason why it should be unstable.

That's good to hear, but did you have the "calculator locking up" problem too? Or not?

I used TI Connect's Device Explorer to do it, by the way. And that's because previously, when I was deleting the Cabri app from the VAR-LINK menu I got a "Crash prevented" message in the bottom of the screen from PreOS (which I was using at the time). I then tried it with the Device Explorer and this didn't happen.

Okay, thanks apcalc.

Indeed, it's rather weird that removing apps can make your calculator crash. Maybe some other program left your calculator in an unstable state ?

Maybe. I know I had some problems before I installed Hw3 Patch, but that's to be expected, and I reinstalled the OS before installing Hw3 Patch.

What would I need to do to make it stable again? Do another RAM clear? Reinstall the OS?

I just deleted the Spanish app, and my calculator now says BUSY in the corner of the screen and has automatically disabled the Apps desktop. When I reenabled it, I got an address error, but fortunately KerNO intercepted it. So I did a RAM clear and now the calculator works perfectly again.

I then tried deleting the French app (the only one left) with the Apps Desktop off. Didn't help, because when I turned it back on, I got another address error- or at least I assume I did. I forgot to reinstall KerNO.

Also, on a semi-related note, what app is "Estad Espanol"? It's not taking up as much memory as the language localization apps but I don't know what it's for.

Statistic Spanish (Stats) perhaps? I only have a normal TI-89 and I can't seem to remember what APPS it came with (if any). That was quite some time ago that I bought it though.

I think you're right.

In any event, when I deleted that one, KerNO gave me an Illegal Instruction error message, but my calculator appeared to work fine afterwards despite that. I did a RAM clear anyway, and now I'm going to reinstall the OS.

And I know that before this, I was deleting apps fine. The only app that I ever had trouble deleting was Cabri, and as I said even that worked after I sent it back and used the Device Explorer. I had installed and deleted other applications since.

This was when I was using PreOS, not KerNO, I only recently switched to KerNO. PreOS gave me a "crash intercepted" message at the bottom of the screen.

Could KerNO be causing the problem? Does it work on the latest Titanium hardware and with the latest Titanium OS?

Or could installing GTC be related to the problem? I used BrandonW's resign68k to sign it with the 89 app key (since it was signed with the community key and I didn't want to install FlashAppy), and that was the last app I installed.

And when I reinstall the OS, should I use TI-Connect's OSDownloader instead of just sending it to my calculator?

As AOC wrote, check the compatibility of KerNO and of your other programs with the Titanium. But neither KerNO nor PreOS are supposed to interfere with FlashApps the way you describe:

I just deleted the Spanish app, and my calculator now says BUSY in the corner of the screen and has automatically disabled the Apps desktop. When I reenabled it, I got an address error, but fortunately KerNO intercepted it. So I did a RAM clear and now the calculator works perfectly again.

I then tried deleting the French app (the only one left) with the Apps Desktop off. Didn't help, because when I turned it back on, I got another address error- or at least I assume I did. I forgot to reinstall KerNO.

so I think that there's something else...
I'm not aware of GTC being horribly unstable, so I'd start by looking elsewhere.

Reinstall the OS, then reinstall HW3Patch, then PreOS or KerNO (the latter is enough as a crash protection), PreOS is necessary only for "kernel-based" programs (which are a minority).

I think I've gotten to the bottom of this.

Well, not really. I still don't know what was causing it, but I found a solution. I did a full backup, then I installed PreOS rather than KerNO (for no real reason, I just wanted to see if it would work differently), and then I cleared Flash ROM, both apps and my archive (using the MEM menu), and then did a RAM clear (using the key combination).

As I expected, I got a little "Crash intercepted" message in the bottom of the screen from PreOS, but all the apps deleted themselves (except for Super Start because I forgot to disable it), and if my calc was left unstable the RAM clear solved that.

Now I'm only going to put back the flash apps I want... and if they were preloaded ones, I'm definitely not going to take them from my backups, I'm going to download them from TI's site. Since I was able to delete downloaded TI apps with no trouble, they should be perfectly deletable.

Then I'll look through the programs I want to put back on and make sure they're all compatible, and then I'll run Ghostbuster on them just to be absolutely certain.

I'd still like to know why my calc got screwed up, but unless I have any other weird behavior I'm going to assume things are okay for now.