- TI-82 Advanced app installation exploit
- 30 May 2015 04:49:34 pm
- Last edited by parrotgeek2 on 08 Sep 2020 03:06:25 pm; edited 3 times in total
[deleted irrelevant wrong information from 2015]
The 82A brings together software and hardware tinkerers 
- BrandonW did exploit something since he said he was able to execute code.
- Over at TI-Planet, critor et al. (not much me because I'm pretty bad at electronics, actually), on an 84+ running the 82A OS, are trying to create some little circuit to get a/the blinking LED of PTT (which will be something needed in French exams from 2018 on), since the voltage measured at the end of the jack was fluctuating and periodic, depending on the PTT state. The goal of this is to make the 84+ (and 84+SE (== 83+.fr USB) whenever a way is found to run the 82A on it) be technically valid for 2018+ French exams.
- BrandonW did exploit something since he said he was able to execute code.
- Over at TI-Planet, critor et al. (not much me because I'm pretty bad at electronics, actually), on an 84+ running the 82A OS, are trying to create some little circuit to get a/the blinking LED of PTT (which will be something needed in French exams from 2018 on), since the voltage measured at the end of the jack was fluctuating and periodic, depending on the PTT state. The goal of this is to make the 84+ (and 84+SE (== 83+.fr USB) whenever a way is found to run the 82A on it) be technically valid for 2018+ French exams.
- 30 May 2015 07:42:44 pm
- Last edited by parrotgeek2 on 08 Sep 2020 03:05:00 pm; edited 2 times in total
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parrotgeek2 wrote:
I didn't realize it was possible for standardized test companies to be crappier than the ones in the US, wow.
They will basically require having a PTT cleaning the memory + blinking LED.
parrotgeek2 wrote:
Do you know how to extract/add apps to a 82u file?
Eh, I haven't messed with the OS at all. BrandonW, at least, knows, though.
I emailed brandonw and this is what he said
EDIT:
Quote:
We don't yet have an 82A boot code dump, so we don't know, but we do have code execution via the OS, so we are prepared to deal with that being fixed. It is fixed on the 83PCE/84+CE.
EDIT:
Quote:
It's the oldest trick in the book -- corrupted memory backups.
I don't actually have the calculator, I can only run the OS on my 84+ -- but those who do have it have taken pictures of the inside and confirmed that it uses exactly the same ASIC and other hardware as the 84+/84+SE. Boot code changes cannot affect how this works.
Until now no one has bothered to understand how to transfer memory backups via direct USB -- no tools exist to transfer them currently, so I'm still in the middle of writing one. When I can clean it up and provide people a way to actually run it, I will release it.
Hope that helps,
Brandon
I don't actually have the calculator, I can only run the OS on my 84+ -- but those who do have it have taken pictures of the inside and confirmed that it uses exactly the same ASIC and other hardware as the 84+/84+SE. Boot code changes cannot affect how this works.
Until now no one has bothered to understand how to transfer memory backups via direct USB -- no tools exist to transfer them currently, so I'm still in the middle of writing one. When I can clean it up and provide people a way to actually run it, I will release it.
Hope that helps,
Brandon
The item about adding support for the DUSB memory backup transfer protocol, against 84+(SE), 84+CSE and 82A, entered the libti* wish list yesterday.
* two-way file I/O (libtifiles, files8x.c) should be painless, given that DUSB memory backups have the same number of parts as DBUS memory backups do;
* the protocol is a matter of building+sending, and later receiving+parsing, the appropriate (and already documented) set of attributes, with the appropriate content. libticalcs, calc_84p.c is involved.
* two-way file I/O (libtifiles, files8x.c) should be painless, given that DUSB memory backups have the same number of parts as DBUS memory backups do;
* the protocol is a matter of building+sending, and later receiving+parsing, the appropriate (and already documented) set of attributes, with the appropriate content. libticalcs, calc_84p.c is involved.
- 01 Jun 2015 08:55:35 am
- Last edited by parrotgeek2 on 08 Sep 2020 03:05:50 pm; edited 1 time in total
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