Author Topic: Signed Operating Systems - Who needs them?  (Read 26760 times)

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Offline JosJuice

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Re: Signed Operating Systems - Who needs them?
« Reply #45 on: August 26, 2011, 02:02:25 am »
Yeah the boot time annoys me. Granted, you can disable hibernation mode so the boot never happens, but then your battery get drained faster while the calc is turned OFF.

On the Prizm there isn't even a boot delay, except you have to configure the calc the first time you turn in ON. The only delay is when turning it OFF, where you see the CASIO logo for about 3 seconds.
I think there's a three second loading time when you turn it on for the first time too, but it's fine since it's not very long.

Offline willrandship

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Re: Signed Operating Systems - Who needs them?
« Reply #46 on: August 26, 2011, 08:52:07 pm »
Yeah, by the way the reason for the 2x longer boot is because of the 2x longer key :P The nspire could have as fast of boot times as an 84+ without boot1 and boot2 getting in the way (Yes I realize you'd need a small boot1 to load the OS files, but that hardly counts.) and you wouldn't even need a standby option anymore.

I do see the wisdom of having, say, a 32 bit key on the OS to act as a form of corruption check, so the inexperienced don't screw up their calc sending a renamed program as the OS unintentionally.

Offline mrmprog

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Re: Signed Operating Systems - Who needs them?
« Reply #47 on: August 26, 2011, 10:17:37 pm »
Quick question: How stable is this? Is there a huge chance of doing something unrepairable to your calc?

Offline calcdude84se

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Re: Signed Operating Systems - Who needs them?
« Reply #48 on: August 26, 2011, 10:32:21 pm »
Quick question: How stable is this? Is there a huge chance of doing something unrepairable to your calc?
As I understand it, it works perfectly :) (Though thepenguin77 would know better of any potential shortcomings.)
« Last Edit: August 26, 2011, 10:32:44 pm by calcdude84se »
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Offline calc84maniac

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Re: Signed Operating Systems - Who needs them?
« Reply #49 on: August 26, 2011, 10:34:49 pm »
Yeah, by the way the reason for the 2x longer boot is because of the 2x longer key :P The nspire could have as fast of boot times as an 84+ without boot1 and boot2 getting in the way (Yes I realize you'd need a small boot1 to load the OS files, but that hardly counts.) and you wouldn't even need a standby option anymore.
Well, it still does take a significant amount of time to load the OS into RAM. The OSes on the earlier TI calcs run directly from the Flash memory, but that's not possible on the Nspire. But yeah, it would be faster without the validation checks.
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Offline thepenguin77

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Re: Signed Operating Systems - Who needs them?
« Reply #50 on: August 26, 2011, 10:48:19 pm »
Quick question: How stable is this? Is there a huge chance of doing something unrepairable to your calc?


As far as I can test, this is very stable. The whole certificate modification system is the same one I used in my old AboutNam program, and I haven't had a single person complain about it not working.

For the exploits, I've watched the whole code process take place in wabbitemu on, 84+SE boot 1.02, 84+BE boot 1.03, 83+ boot 1.01, 83+ boot 1.00. And on all of those, it worked perfectly.

I've also tested this a bunch on my real 84+SE. I've tested sending signed and unsigned OS's as well as signed and unsigned apps. Calcdude's also sent a few custom OS's to his calculator.


So, as far as I know, this is super stable.
« Last Edit: August 26, 2011, 10:52:28 pm by thepenguin77 »
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Offline mrmprog

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Re: Signed Operating Systems - Who needs them?
« Reply #51 on: August 26, 2011, 10:51:45 pm »
Awesome! My bro got a new calc, and I wanted to make sure this was safe before I tried it.

Offline meishe91

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Re: Signed Operating Systems - Who needs them?
« Reply #52 on: September 05, 2011, 09:06:18 pm »
Just wanted to say thanks for this :) Just got a 84+SE and am now happy I have my beloved 2.43 OS back on it ;D
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Offline jan92

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Re: Signed Operating Systems - Who needs them?
« Reply #53 on: February 04, 2012, 09:48:39 am »
How do I run this patch on my TI-84?
 I am still unfamiliar with the ti-84 so who wants a step by step action plan to give

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Re: Signed Operating Systems - Who needs them?
« Reply #54 on: February 04, 2012, 01:24:48 pm »
Upload the program to your TI-84 and run it with Asm( (which is in Catalog). The rest should be pretty straightforward I think.

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