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Unfortunately, as someone who enjoys taking things apart to learn how they work, I am still somewhat interested in the CAS+. Does anyone know if the OS is encrypted (on the NAND Flash)? Has anyone tried to directly dump the OS from it?
Quote from: mikehill2003 on March 23, 2011, 01:33:27 pmUnfortunately, as someone who enjoys taking things apart to learn how they work, I am still somewhat interested in the CAS+. Does anyone know if the OS is encrypted (on the NAND Flash)? Has anyone tried to directly dump the OS from it?If the CAS+ is anything like the released TI-Nspire/TI-Nspire CAS, then the OS is encrypted but the encryption key is present in the second-stage boot loader, which is merely compressed (and we can easily decompress it).However, I don't think anybody has tried to dump the NAND flash by means of hardware hacking; I didn't know that was even feasible.
Quote from: Goplat on March 23, 2011, 04:30:27 pmQuote from: mikehill2003 on March 23, 2011, 01:33:27 pmUnfortunately, as someone who enjoys taking things apart to learn how they work, I am still somewhat interested in the CAS+. Does anyone know if the OS is encrypted (on the NAND Flash)? Has anyone tried to directly dump the OS from it?If the CAS+ is anything like the released TI-Nspire/TI-Nspire CAS, then the OS is encrypted but the encryption key is present in the second-stage boot loader, which is merely compressed (and we can easily decompress it).However, I don't think anybody has tried to dump the NAND flash by means of hardware hacking; I didn't know that was even feasible.Well, I don't own an Nspire CAS(+ or not) yet, so I can't say for sure if it is feasible on an Nspire, but it has worked just fine for me on many other NAND Flash chips. Give me a few minutes and I'll find a simple tutorial.
Interesting. I've got several CAS+ so I can take the risk.But I've only got an EPROM programmer The NAND chip is a ST NAND256W3A.
There is a photo of the inside of a CAS+ plus that I have been wondering about for a year and a half:http://www.datamath.org/Graphing/JPEG_NSpire_CASP.htm#memoryIs that white 30 pin J02 connector possibly the JTAG connector ?
Those aren't for the keyboard?
Quote from: mikehill2003 on March 23, 2011, 05:32:46 pmThose aren't for the keyboard?J02, probably...But what's the purpose of the J04 present on older CAS+?
Wow! Thanks for pointing that out bsl! Looking at the CAS+ and CAS boards side by side, there are some large differences between them. Now I really doubt that the CAS+ can run a production OS. Quote from: critor on March 23, 2011, 05:35:06 pmQuote from: mikehill2003 on March 23, 2011, 05:32:46 pmThose aren't for the keyboard?J02, probably...But what's the purpose of the J04 present on older CAS+?I can't really tell from that photo where the traces lead.