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Author Topic: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower  (Read 23414 times)

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Offline apcalc

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New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« on: June 14, 2011, 07:02:27 pm »
Much like they did with the Nspire CX, Texas Instruments has taken the liberty of sending TI-BANK and critor a test of the TI-84 Pocket:

A short summary of the new calc is posted in the original thread:

Quote
TI sent me a brand new TI-84 Pocket.fr.

Check the photos, tests and informations on TI-Bank:
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1176

To be short:
- as expected, it's similar with the basic TI-84+
- no miracle: only 48Kb RAM like all recent TI-84+

You might have been right with the 2.71MP OS.
The calculator includes a new 1.03 Boot Code. Remember that on TI-z80 Flash, the Boot Code only deals with the OS installation...
So probably some bad news very soon...

Quote
With the new 1.03 Boot Code on the new TI-84 Pocket.fr (and probably soon on the newest TI-84+/84+SE):
- you cannot downgrade to any TI OS below 2.55MP
- you cannot install third party OSes anymore
- you cannot even install a patched 2.55MP OS
- the OS validation screen alone needs 6-7 minutes in the best case (no, it's not frozen)

It seems as if the new Boot Code 1.03 is a disastrous addition to the calculator.  Much like with OS 2.1, the boot code blocks downgrading and third party Operating Systems on the TI-84.  With the exception of the MP Operating Systems (which technically could be considered an "update"), TI has done little against the 84 community, making most of their attacks against the Nspire.  This marks a new age, with a direct attack against TI-84 developers.  The loss of ability to install any OS makes it impossible for users to downgrade to the more stable OS 2.43 and to install custom OSes, such as KnightOS.

Although this boot code can only be confirmed to exist on the TI-84 Pocket, it is possible that it will find its way on newly produced TI-84s, bringing disastrous results to the 84 development community.

OS 2.71 MP is not April Fools any more!



More information, good and bad, will be added here when available.
« Last Edit: June 14, 2011, 11:28:14 pm by DJ_O »
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Offline Deep Toaster

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Re: New TI-84 Pocket Info
« Reply #1 on: June 14, 2011, 08:25:42 pm »
Quote from: apcalc on June 14, 2011, 07:02:27 pm
It seems like the new boot code is a quite negative addition to the OS; at this point, tests performed by critor seem to indicate that downgrading is blocked! :(

Bah, really sucks, especially with all those problems that the MP OSes have brought us. It has OS 2.55MP, right?
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Offline apcalc

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Re: New TI-84 Pocket Info
« Reply #2 on: June 14, 2011, 08:30:14 pm »
Quote from: Deep Thought on June 14, 2011, 08:25:42 pm
Quote from: apcalc on June 14, 2011, 07:02:27 pm
It seems like the new boot code is a quite negative addition to the OS; at this point, tests performed by critor seem to indicate that downgrading is blocked! :(

Bah, really sucks, especially with all those problems that the MP OSes have brought us. It has OS 2.55MP, right?

Yes, it has OS 2.55 MP. :(
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Offline Deep Toaster

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Re: New TI-84 Pocket Info
« Reply #3 on: June 14, 2011, 08:34:28 pm »
Well, at least they didn't "upgrade" it into something unthinkable.
« Last Edit: June 14, 2011, 08:34:55 pm by Deep Thought »
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Offline critor

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Re: New TI-84 Pocket Info
« Reply #4 on: June 14, 2011, 10:14:17 pm »
With the new 1.03 Boot Code on the new TI-84 Pocket.fr (and probably soon on the newest TI-84+/84+SE):
- you cannot downgrade to any TI OS below 2.55MP
- you cannot install third party OSes anymore
- you cannot even install a patched 2.55MP OS
- the OS validation screen alone needs 6-7 minutes in the best case (no, it's not frozen)

I've just released the info in a "non-agressive" way:
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1177


But you are free to report things "differently" ;)
« Last Edit: June 14, 2011, 10:24:07 pm by critor »
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Offline Juju

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Re: New TI-84 Pocket Info
« Reply #5 on: June 14, 2011, 10:33:56 pm »
What the hell.

1. Can you install 2.71MP?
2. You can't downgrade the Boot Code right?

Seems TI isn't as open as in the past anymore.
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Offline critor

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #6 on: June 14, 2011, 10:40:31 pm »
Quote from: juju2143 on June 14, 2011, 10:33:56 pm
What the hell.

1. Can you install 2.71MP?

2.71MP was a patched 2.55MP if I remember well. So it cannot be installed with the new 1.03 Boot Code.



Quote from: juju2143 on June 14, 2011, 10:33:56 pm
2. You can't downgrade the Boot Code right?

I suppose it is possible, but we'll have to go through several hardware hacks/mods, and it will be much harder than plugging a RS232 device on a TI-Nspire.

But on the other side, TI cannot upgrade your Boot Code either.
« Last Edit: June 14, 2011, 10:41:21 pm by critor »
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Offline DJ Omnimaga

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #7 on: June 14, 2011, 10:59:36 pm »
Darn this sucks, but are we sure there's no way to downgrade or install patched OSes?

-Are the RSA keys any different or something? Also does it blocks downgrades back to 2.55MP, should a new OS come out?
-Does the 2.55MP included still includes third-party apps compatibility and the Asm()/AsmComp()/Asmprgm commands?
-Does Output() runs at the same speed as on other calcs? ???
-Is it possible to install patches after installing the OS, such as Zstart? Or will the OS give an error on boot once it's modified?

I hope I did not give them ideas... O.O
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Offline Darl181

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #8 on: June 14, 2011, 11:00:18 pm »
Can 2.55 from a normal 84 be sent to the Pocket?
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Offline critor

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #9 on: June 14, 2011, 11:04:09 pm »
Quote from: Darl181 on June 14, 2011, 11:00:18 pm
Can 2.55 from a normal 84 be sent to the Pocket?

Yes. :)
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Offline ralphdspam

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #10 on: June 14, 2011, 11:10:41 pm »
Is it still running at 15Mhz?  Is the graphics card better?  How is the screen?
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Offline AngelFish

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #11 on: June 14, 2011, 11:11:18 pm »
I'm pretty sure there's no graphics card in the pocket...
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Offline Deep Toaster

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #12 on: June 14, 2011, 11:12:13 pm »
I wonder if those screen flipping tricks still work, and if it needs ALCDFIX. Or if it got worse.
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Offline Dingus

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #13 on: June 14, 2011, 11:21:20 pm »
Quote from: DJ_O on June 14, 2011, 10:59:36 pm
Darn this sucks,

Well, well, well, TI is back to their same old tricks.  They throw us a bone called Lua, and every body breathes a sigh of relief.  Was that premature?  I think so.  Surely their intentions are to put those unwanted goodies on all new 84's, what then? 
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Offline DrDnar

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Re: New TI-84 Pocket Info, 2.71 MP Returns :(
« Reply #14 on: June 14, 2011, 11:24:09 pm »
Can we get a dump of this supposed code?
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