Author Topic: Replace the NAND from a Ti-84+ to upgrade storage?  (Read 7572 times)

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Offline JosJuice

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Re: Replace the NAND from a Ti-84+ to upgrade storage?
« Reply #15 on: February 08, 2011, 01:20:18 pm »
You only need to flash the boot code and certificate sectors.
Then you should be able to install an OS from the computer or another calculator.
The certificate of an 84+ can be used if it's moved to the correct location, right?

It's true for the boot code, which is identical.
I don't know about the certificate...
No, the boot code of the 84+ and the 84+ SE are different.

Offline critor

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Re: Replace the NAND from a Ti-84+ to upgrade storage?
« Reply #16 on: February 08, 2011, 01:24:05 pm »
You're right.
Sorry, I hadn't checked those dumps for over a year.
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Offline thepenguin77

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Re: Replace the NAND from a Ti-84+ to upgrade storage?
« Reply #17 on: February 08, 2011, 03:09:56 pm »
Obviously specific software would have to be written to take advantage of this, but couldn't a 4MB or 8MB chip be installed and then have a switch installed to swap out the page sets?

I'll just explain the 4MB for simplicity. You install the 4MB chip and have the highest pin tied to a physical switch that is default on. Then you load the OS and certificate and boot sector into the 80 - FF range, which the calculator just sees as 00 - 7F. So like this, the calculator would be completely normal. But now, you flip the switch and have access to the first page set which could be used for archive purposes. Obviously things would have to remain in RAM when the pages are swapped, but I don't really see any problems with this idea. You could even make a boot page and page 0 so that if a ram clear occurs, it would give a message to flip the switch.
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Offline jnesselr

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Re: Replace the NAND from a Ti-84+ to upgrade storage?
« Reply #18 on: February 09, 2011, 12:38:23 pm »
That ^ would be more difficult, but plausible.  You would have to have a hardware flasher to flash the chip, though, correct?