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Offline donbirdy

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Quick question regarding TI-nspire CX
« on: September 09, 2014, 08:17:02 am »
Greetings all,


Apologies if this is a noobish question however I've just recently purchased a TI-nspire CX and desperately need the Computer Algebra System Functionality.


I have purchased the calculator second hand (The last 7 digits of the serial number at the back of the calculator are: P-0511b.


The current software version on the device, (I presume stock) is Version 3.9.0.463 as defined under "Handheld Status".


After doing a little bit of research, it appears as if there is no hardware limitation for use of CAS features implemented in the TI-nspire CAS.


It is my understanding that the boot2 can be modified in order to unleash the CAS features on the CX device.


Does anyone know how I can go about doing this?


Any help would be greatly appreciated.


Many Thanks!



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Offline DJ Omnimaga

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Re: Quick question regarding TI-nspire CX
« Reply #1 on: September 09, 2014, 08:39:00 am »
Since it's a B (2011) hardware revision, it isn't as restricted as hardware J and higher and it probably came with OS 3.0.1, so the previous owner probably upgraded it before selling it. I believe there is a way to downgrade from OS 3.9 on older models, but I think the minimum is OS 3.6, according to this post https://tiplanet.org/forum/viewtopic.php?f=15&t=15163&p=169442&hilit=downgrade+os+3.9#p169442 and I forgot how it is possible to downgrade from OS 3.9 to that OS, let alone a CAS OS.

Otherwise the other alternative is to use KhiCAS.
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #2 on: September 13, 2014, 01:13:53 pm »
Thanks for that DJ Omnimaga,


I am struggling to find some instructions that are in English for running KhiCAS (I have Googled extensively).


If anyone could point me in the right direction it would be greatly appreciated :D.


Many Thanks again,
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Offline DJ Omnimaga

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Re: Quick question regarding TI-nspire CX
« Reply #3 on: September 14, 2014, 01:20:25 am »
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #4 on: September 14, 2014, 11:20:41 am »
Thanks for all your help.


I have soldered up a TTL connection, does anyone know where I can find the 3.6 ROM I have looked everywhere!


I will probably need to re-flash the boot2 loader in order to get the 3.6 OS to work? Is this lurking around anywhere.
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #5 on: September 14, 2014, 11:24:02 am »
It is worth noting:





Boot1 Code Version: 3.0.0.99
Boot2 Code Version: 3.2.4.7


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Offline DJ Omnimaga

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Re: Quick question regarding TI-nspire CX
« Reply #6 on: September 14, 2014, 12:38:13 pm »
TI-Planet download section has links to external OS files including 3.6.
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #7 on: September 15, 2014, 03:41:41 pm »
Thanks DJ,


I have now successfully downgraded the boot2 image!


The current version I'm using is 3.10.16.


However, when I attempt to install OS 3.6 I get this error with "TI-Nspire Computer Link Software"


"You cannot install a version of the OS that is older than the currently installed version."


I'm not sure how the software knows what the current version of the old software was but is there away around it?


« Last Edit: September 15, 2014, 04:41:24 pm by donbirdy »
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #8 on: September 17, 2014, 06:51:47 am »
Bump


 :w00t: :w00t: :w00t: :w00t: :w00t: :w00t: :w00t: :w00t: :w00t: :w00t: :w00t:
Any ideas?
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #9 on: September 19, 2014, 08:42:49 am »
Can anyone think of a way around this?
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #10 on: September 20, 2014, 01:47:36 pm »
A big shout out to the guys on IRC channel #ti on EFNet.


See below:


Use nLaunchy
« Last Edit: September 20, 2014, 02:27:32 pm by donbirdy »
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Offline Springyboy

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Re: Quick question regarding TI-nspire CX
« Reply #11 on: September 21, 2014, 10:47:50 pm »
Quote from: donbirdy on September 15, 2014, 03:41:41 pm
Thanks DJ,


I have now successfully downgraded the boot2 image!


The current version I'm using is 3.10.16.


However, when I attempt to install OS 3.6 I get this error with "TI-Nspire Computer Link Software"


"You cannot install a version of the OS that is older than the currently installed version."


I'm not sure how the software knows what the current version of the old software was but is there away around it?




I think you are running os 3.1. In that case, you can install ndless 3.1 instead of ndless 3.6, which is much more stable and doesn't need to be reinstalled. Then just follow the instructions to install KhiCas
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Offline Hayleia

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Re: Quick question regarding TI-nspire CX
« Reply #12 on: September 22, 2014, 12:58:25 am »
Quote from: Springyboy on September 21, 2014, 10:47:50 pm
I think you are running os 3.1. In that case, you can install ndless 3.1 instead of ndless 3.6, which is much more stable and doesn't need to be reinstalled. Then just follow the instructions to install KhiCas
He was not running OS 3.1, he came from 3.9 and downgraded to 3.6.
And since he uses nlaunchy, Ndless doesn't need to be reinstalled.

However, if the goal is to have the CAS, it's true that it can be a good idea to install 3.1 (you can put a 3.1 CAS OS on a non-CAS CX but you can't with the 3.6).
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Offline DJ Omnimaga

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Re: Quick question regarding TI-nspire CX
« Reply #13 on: September 22, 2014, 02:19:45 am »
Yeah from what I remember, CAS on non-CAS didn't work except with OS 3.1, although I wasn't sure anymore. Nspire support tend to be sparse on Omni nowadays for some reasons, but I guess TI doesn't help much by alienating the TI-Nspire fanbase with lockdowns that requires dangerous manipulations to circumvent for inexperienced users.
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Offline donbirdy

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Re: Quick question regarding TI-nspire CX
« Reply #14 on: September 22, 2014, 05:21:17 am »
Quote from: Hayleia on September 22, 2014, 12:58:25 am
Quote from: Springyboy on September 21, 2014, 10:47:50 pm
I think you are running os 3.1. In that case, you can install ndless 3.1 instead of ndless 3.6, which is much more stable and doesn't need to be reinstalled. Then just follow the instructions to install KhiCas
He was not running OS 3.1, he came from 3.9 and downgraded to 3.6.
And since he uses nlaunchy, Ndless doesn't need to be reinstalled.

However, if the goal is to have the CAS, it's true that it can be a good idea to install 3.1 (you can put a 3.1 CAS OS on a non-CAS CX but you can't with the 3.6).


Hi Hayleia,


I have now successfully downgraded to OS 3.1.


I am still in the process of learning what can be done with the TI-nspire CX. So far I have managed to play Doom haha.


Thanks for everyone's help.
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