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Author Topic: OS 2.55MP released  (Read 57466 times)

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Offline critor

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Re: OS 2.55MP released
« Reply #45 on: January 11, 2011, 06:09:03 pm »
Quote from: willrandship on January 11, 2011, 06:06:08 pm
what happens if you press mode and try to look at the clock? does it crash, or just output garbage?

The clock is frozen with a 1986 date.
Secs aren't increased.

Setting the clock doesn't change anything: you're back in 1986 immediatly.
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Offline TIfanx1999

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Re: OS 2.55MP released
« Reply #46 on: January 11, 2011, 06:11:30 pm »
Wow, I feel like I'm watching back to the future now. (Even though that was 1985) ;D
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Offline willrandship

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Re: OS 2.55MP released
« Reply #47 on: January 11, 2011, 06:12:25 pm »
Well, that's good. it would be a pain to never be able to access mode.
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Offline critor

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Re: OS 2.55MP released
« Reply #48 on: January 11, 2011, 06:14:58 pm »
Credits for the patch go to BrandonW.

He made the 1st patch to install the 2.53MP OS on a TI-83+SE.

I just made exactly the same modifications in the 2.55MP OS, having just to recalculate the checksums.



By the way, seems we're going to have a 2.56MP 84+ ROM in the next basic TI-Nspire OS (supposed to be 2.2 in february).
« Last Edit: January 11, 2011, 06:16:52 pm by critor »
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Offline TIfanx1999

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Re: OS 2.55MP released
« Reply #49 on: January 11, 2011, 06:16:50 pm »
Ah, I was wondering how it came about so quickly. That explains things. Still very nice. I'd love to test on my 83+ SE, but it's kind of... deadish at the moment. :/
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Offline DrDnar

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Re: OS 2.55MP released
« Reply #50 on: January 11, 2011, 06:34:32 pm »
I don't remember the boot code having a downgrade protection feature. Even if it did, it would have to be certificate-based. A certificate-based restriction could easily be undone by restoring your certificate from an older backup. What? You don't keep backups of your certificate? Shame.

Also, the TI-Boy issue can be solved by first copying the extra OS page to the 32 K sector, and then proceeding as normal. For that matter, you could patch the new OS to use that dang 32 K sector instead.
« Last Edit: January 11, 2011, 06:36:24 pm by DrDnar »
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Offline Michael_Lee

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Re: OS 2.55MP released
« Reply #51 on: January 11, 2011, 06:59:20 pm »
Hmm, trying 2.55 now...

Insofar as I can tell, it doesn't seem to conflict with anything I have...
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Offline fb39ca4

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Re: OS 2.55MP released
« Reply #52 on: January 11, 2011, 07:00:40 pm »
Quote from: yeongJIN_COOL on January 11, 2011, 05:02:55 pm
TI should get a new programming team
It's probably not a team anymore.
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Offline critor

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Re: OS 2.55MP released
« Reply #53 on: January 11, 2011, 07:01:41 pm »
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Offline DJ Omnimaga

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Re: OS 2.55MP released
« Reply #54 on: January 11, 2011, 07:12:26 pm »
Quote from: critor on January 11, 2011, 06:04:38 pm
In fact, it's very unstable on a basic TI-83+, as the 2.55MP OS is using 48Kb RAM (and the basic TI-83+ only has 32Kb RAM).

But it works on a TI-83+SE (128Kb RAM).

So you can upgrade your TI-83+SE to a TI-84+SE with the patch (without the clock and the USB obviously).
Nice!
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Re: OS 2.55MP released
« Reply #55 on: January 11, 2011, 07:28:10 pm »
I just tweeted at @TICalculators, maybe they will actually be nice and listen to our complaints
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Re: OS 2.55MP released
« Reply #56 on: January 11, 2011, 07:47:56 pm »
Quote from: DJ Omnimaga on January 11, 2011, 07:12:26 pm
Quote from: critor on January 11, 2011, 06:04:38 pm
In fact, it's very unstable on a basic TI-83+, as the 2.55MP OS is using 48Kb RAM (and the basic TI-83+ only has 32Kb RAM).

But it works on a TI-83+SE (128Kb RAM).

So you can upgrade your TI-83+SE to a TI-84+SE with the patch (without the clock and the USB obviously).
Nice!
So you can install this on a 83+? That's nice.
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Offline critor

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Re: OS 2.55MP released
« Reply #57 on: January 11, 2011, 07:59:12 pm »
Quote from: juju2143 on January 11, 2011, 07:47:56 pm
Quote from: DJ Omnimaga on January 11, 2011, 07:12:26 pm
Quote from: critor on January 11, 2011, 06:04:38 pm
In fact, it's very unstable on a basic TI-83+, as the 2.55MP OS is using 48Kb RAM (and the basic TI-83+ only has 32Kb RAM).

But it works on a TI-83+SE (128Kb RAM).

So you can upgrade your TI-83+SE to a TI-84+SE with the patch (without the clock and the USB obviously).
Nice!
So you can install this on a 83+? That's nice.

Install on a 83+, yes.
Make it work properly, no...

It only works on 83+SE.

83+SE is not the same as 83+.
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Offline calcdude84se

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Re: OS 2.55MP released
« Reply #58 on: January 11, 2011, 09:03:48 pm »
Quote from: DrDnar on January 11, 2011, 06:34:32 pm
I don't remember the boot code having a downgrade protection feature. Even if it did, it would have to be certificate-based. A certificate-based restriction could easily be undone by restoring your certificate from an older backup. What? You don't keep backups of your certificate? Shame.

Also, the TI-Boy issue can be solved by first copying the extra OS page to the 32 K sector, and then proceeding as normal. For that matter, you could patch the new OS to use that dang 32 K sector instead.
Do you mean $3C/$7C-$3D/$7D or $2A/$6A-$2B/$6B? IIRC the former already contains OS code, and with respect to the latter the .8xu format can't have the OS anywhere except the first and last sixteen pages.
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Offline DrDnar

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Re: OS 2.55MP released
« Reply #59 on: January 11, 2011, 09:21:06 pm »
Huh. I thought the sector at 7Ch was unused.
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