CE jailbreak allows ASM programs to work again!
Posted by Xavier on 6 September 2020, 20:58 GMT

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We're happy to relay a very interesting, yet unsurprising, piece of news: the ability for the TI-83 Premium CE, TI-84 Plus CE(-T) and Python editions thereof, to run ASM programs, officially removed by TI a few weeks/months ago depending on the model, as reported in the previous news item, has been unofficially added back thanks to a jailbreak, called 'arTIfiCE'. From what we can see in the install tutorial, arTIfiCE seems to exploit a bug in the 'Cabri Jr' geometry app in order to launch a shell.

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This move was so obvious and predictable that it was really a matter of when, not if. After all, the TI-eZ80 series was not designed with security in mind, and in fact no TI graphing calculator model released to date is (even though TI seems to have learned a few tricks in the newer, high-end TI-Nspire CX II series, its security roadblocks appear to have been defeated relatively early on)

What are the next steps? Logically, just like on the TI-Nspire series, TI would release new software versions fixing the vulnerabilities used in the current iteration of the jailbreak, then more vulnerabilities will be exploited to restore access to native code again. Rinse and repeat, for a while, it's the usual cat & mouse 'game'.
Thinking out loud, we might see a series of 0-days showcasing exam mode insecurity being released over the several few days/weeks before the major exams of the northern hemisphere - something the TI enthusiasts community always refrained from doing. Such a timeframe would make it possible for some users to use programs interfering with exam mode (and needless to say, face the significant consequences if they get caught! - just to be clear, we are not condoning cheating). And this, most importantly, before the fixes for the vulnerabilities get a chance to be made and widely distributed, as well as standardized testing regulation amended to forbid usage of the older, vulnerable versions and to mandate thorough checks of the current state of calculators right before the exam is taken.
If that situation were to happen, it would probably be better to give up on the current exam mode 'security model' entirely and rather reflash the OS with an exam-tailored version right in the exam room - something that should have been done from the get go, notwithstanding the practical hurdles, if the fantasized exam security were actually taken seriously. Unfortunately, a path of lower resistance for the educational system would be to just forbid the usage of the affected calculator models, several days before the exams, creating more injustice and further reducing the real-world value of said exams!

Time will tell, but there's a chance that there will be a spectacular - and publicized - backfire for the very smart demands from standardized testing regulation authorities, who didn't get (or didn't understand) the memo that predictably, removing access to native code does not make exams safer - quite the contrary.
Top-level TI management should be somewhat aware of that, in fact some of us in the community, myself included, attempted to explain all that to them several years ago... but we know that regulators have the power to forbid pieces of equipment for whatever reason, and manufacturers need to bend to their demands, no matter how unfounded, ill-motivated and counterproductive...

Thankfully, I'm not in the shoes of the previously mentioned teacher whose video about a long-fixed issue in TI's OS allowing exam mode restrictions bypass on the TI-eZ80 series might well have contributed to the removal of official native code access on those calculators, then consequently the current jailbreak, and might therefore contribute to potential future attacks on the exam mode.
Triggering a worldwide restriction on users' rights to use the hardware they bought, and potentially forbidding hundreds of thousands of calculators and creating further stress for students taking exams, is not something I'd be proud of.

arTIfiCE's author doesn't seem to have uploaded it to our files archives yet(?), so for now, CE users stuck with a recent OS version can learn more on its official website. Go forth and use that great piece of work, which raises the usefulness of the Cabri app :)

Article written by Lionel Debroux.

Description

Oiram is Mario-style platformer for the CE. Includes many features and enemies. Source code is linked in readme. Enjoy! There's also a level editor to make your own levels here: https://github.com/mateoconlechuga/oiram-editor/releases/latest

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Reviews

This game is by far the best I have played. My only grudge is that I have spent over 50 hours on this game lol

This was a truly amazing play! I can't imagine how much work it took, but it was worth it! Very engaging and addictive; now that I've finished it, I feel like I can finally move on with my life (until I download some more levels). The graphics and mechanics are true to the original game, and it could just as easily be the real deal. One of the best games I've ever played on my calc.

A great game to boost our nostalgia of the simple 8-bit to 16-bit days. Absolutely love the level design and the compatibility. A must-have for all calculator users!

It's a faithful Mario port for the TI-84 Plus CE; what else is there to say? The controls are intuitive and responsive, the graphics are attractive, the gameplay is smooth, and it's an utterly enjoyable game. Your only challenge will be putting the game down when it's time to do math again.

TI 84 Plus CE with TI Connect CE I added Oriam and am being told by the calc after using asm(PrgmORIAM, Err: Missing Oriam AppVars. Reinstalling everything after a reset wouldn't fix it.

Ti 84 Plus Ce Pokemon

cmalasadas this problem has been addressed. There has been broken compatibility because of a new software update, which broke keybinding for certain coding languages like C or something like that. Please refer to https://codewalr.us/index.php?topic=1586.msg58935;topicseen#new if you are confused about this. This game is amazing and it is a shame that this is happening to you. Good luck!

Controls don't work on TI-84 Plus CE I can press buttons on the start screen, but when I start the game, no buttons work (even DEL or CLEAR or OFF, no buttons on my calculator work, I can't even force quit the game)

This game is OUTSTANDING! It's a must have for any TI-84 Plus CE.

Hands down probably the best game for the Ti 84+ CE.

i have followed the instructions but i get the memory error even though i don't have anything on my calculator, how do i need to fix this and how did you guys got the game to work?

Pokemon For The Ti-84 Plus Ce

this game is absolutely awesome! definitely a must have for the 84+ CE! though it sometimes crashes my calc, I have faith that better updated versions will soon come!

Every time I try to launch it it gives me a memory error message, could someone please help?

Amazing! The graphics were amazing, and it fits in perfectly with the amazing series of games and programs Mateo has given the community. The game itself was one of the most immersive I have seen in a long time, even though I rarely download calculator games. I really don't know how Mateo will top this, but he has surprised us in the past!

Another legendary game created by MateoConLechuga! This game is obviously a Mario plat-former that is incredibly well programmed! I have never experienced any lag, which of course is great. There are a wide variety of enemies and power-ups and many fun secrets to find! Although there aren't many built-in levels, there are tons of maps made by other users and you could always just download Mateo's Oiram level editor and create more levels! The graphics are very nice, it definitely feels like the real thing. The controls take a little getting use to, but overall they are pretty nice, there is even an option to change the key-map layout, very useful! Overall a great program, and definitely recommended. 10/10 p.s. For the inexperienced calculator users out there, this is an Assembly program, not a Basic program. Read the ReadMe.txt to see how to run this program.

Pokemon Red Ti-84 Plus Ce

Versions

1. Oiram (published 1 year, 6 months ago; 2019-05-18 19:19 UTC)

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