This also means the OS would not be upgradeable, right?

Why?...


Physically, it can be upgraded, by pluging the Flash-chip in an EPROM programmer.
But the probability I just break the calculator doing something like that is over 99%.

I'm looking for a simpler way, a 100% software-way, or a way which would only require some minor hardware modifications.

Oh, from what I read in your post, it seemed like we wouldn't be able to upgrade the TI-83 ROM to a TI-83+ OS, as you mentionned some flash pages were not accessible. Of course maybe it would be possible with modifications, but I specifically meant for people who don't want to modify their hardware. I migth have misunderstood you, though, but I know nothing about hardware.

Don't worry. I may not have found the best words to explain things.
Well, I hope we can find a way with only small hardware modifications.
(like disconnecting a pin, and connecting 2 pins...)


Anyway, I've started my own topic and given all my informations again.
It was a little off-topic here, sorry about that.

http://ourl.ca/7922

Now if only it was as easy as on some Casio calcs, where you just black out something on the motherboard and your calc becomes a new one... (as described on Casio-BANK)

(For those who understand french and are curious, this is what I mean, but the link is currently not working because Free.fr hosting provider is terrible: http://casio.bank.free.fr/modules/archives/downloads/C2Dupgrade.pdf )

Yes, it would be great if I could make such a "simple" tutorial to upgrade the TI-82Stats.fr and TI-76.fr.

Epic necropost ftw! j/k

Naw, I just wanted to say thank you to all as I did get this figured out (I found a copy of OS 2.21 lying around somewhere... ).

New question on a related note: How do I dump the Nspire versions of the 84+ OS from an Nspire ROM/OS?  (I have very little/limited access to a real Nspire...).

Thx in advance

Epic necropost ftw! j/k

Naw, I just wanted to say thank you to all as I did get this figured out (I found a copy of OS 2.21 lying around somewhere... ).

New question on a related note: How do I dump the Nspire versions of the 84+ OS from an Nspire ROM/OS?  (I have very little/limited access to a real Nspire...).

Thx in advance

I'm not sure exactly how, but the Nspire OS's are some sort of archive, which can be opened with 7-Zip etc. Inside said OS is a file named TI-Nspire.img, which can also be opened with 7-Zip etc. In TI-Nspire.img is a folder named ti84, in which there are a bunch of files with names like "84rom15.bin". I have no idea how they are formatted, just that their names are suspicious .

does this mean programs and apps can be [auto-]installed when the os is sent and validated?

I think critor was talking about the 83, but anyway:
Only reliably for a TI-83+, because the OS format only allows $20 pages, which is how many the 83+ has. For the 83+, programs and appvars are a definite "yes", while apps are more unlikely, given that their installation requires changes to the certificate.